WO2024125565A1

WO2024125565A1 - Recuperative waste heat recovery system and method for high-temperature solid slag particles

Info

Publication number: WO2024125565A1
Application number: PCT/CN2023/138513
Authority: WO
Inventors: 肖永力; 李永谦; 关运泽; 王英杰; 张友平
Original assignee: 宝山钢铁股份有限公司
Priority date: 2022-12-13
Filing date: 2023-12-13
Publication date: 2024-06-20

Abstract

A recuperative waste heat recovery system for high-temperature solid slag particles, the system comprising: a granulating device (11), the granulating device (11) preferably being a gas-quenching granulating device, a gas-water granulating device or a rotary-cup granulating device; a rolling recuperative heat exchanger (12), the rolling recuperative heat exchanger (12) comprising a slag particle inlet (1213) corresponding to a slag outlet (1112) of the granulating device (11), a slag particle outlet (1214), and a heat exchange tube group (123) located inside the recuperative heat exchanger (12), wherein the heat exchange tube group (123) has a cooling medium inlet (1211) and a cooling medium outlet (1212), and a cooling medium is preferably water; and a waste heat recovery apparatus, wherein the cooling medium inlet (1211) and the cooling medium outlet (1212) are both connected to the waste heat recovery apparatus by means of pipes. The waste heat recovery system does not use an intermediate heat transfer medium, and has the advantages of high heat-exchange efficiency and high heat-recovery efficiency.

Description

A partition-type high-temperature solid slag waste heat recovery system and method

Technical Field

The invention relates to waste heat recovery technology, and in particular to a partition-type high-temperature solid slag particle waste heat recovery system and method.

Background technique

In today's social development, the steel industry is China's basic industry. It guarantees the development of the economy and the construction of basic people's livelihood, but the steel industry is also a major energy consumer and pollution emitter. After investigation, it was found that the waste heat resources in steel production account for 60% of the total energy consumption of steel production, and are mainly stored in products, blast furnace slag, waste, and steel slag. In China, the temperature of blast furnace slag is between 1400 and 1550°C, and each ton of slag contains (1260-1880)×10 ³ J of sensible heat, which is equivalent to the calorific value of 60kg of standard coal. After granulation, its temperature is at least 200-900°C, preferably 300-800°C. Therefore, the research and development of high-temperature slag waste heat recovery technology is of great significance to energy conservation and emission reduction in the steel industry.

The heat exchange part of the high-temperature slag waste heat recovery technology mainly includes the granulation process of high-temperature molten slag, the waste heat recovery process of high-temperature slag particles after granulation; and the process of treating the cooling medium after the heat is recovered. The waste heat recovery methods of high-temperature slag particles include: direct gas-solid contact heat exchange, direct liquid-solid contact heat exchange, indirect contact heat exchange, etc. The cooling medium includes water, air, etc. However, the research and development of large-capacity slag treatment is not sufficient, and there is still a problem of heat energy waste.

Summary of the invention

In view of the above technical problems, the purpose of the present invention is to propose a partition-type high-temperature solid slag waste heat recovery system, in which the heat transfer process includes direct contact heat exchange between air and slag particles, and indirect contact heat exchange between water/water vapor and slag particles, thereby improving the heat recovery efficiency of high-temperature solid slag particles.

To achieve the above object, the technical solution of the present invention is:

A partition-type high-temperature solid slag waste heat recovery system, comprising:

Granulation device, the granulation device is preferably a gas quenching granulation device, a gas-water granulation device or a rotary cup Granulation device;

A rolling partition heat exchanger, the partition heat exchanger comprising a slag inlet and a slag outlet corresponding to the slag outlet of the granulating device, and a heat exchange tube group located inside the partition heat exchanger, the heat exchange tube group having a cooling medium inlet and a cooling medium outlet, preferably the cooling medium is water; and

The waste heat recovery device, the cooling medium inlet and the cooling medium outlet are respectively connected to the waste heat recovery device through pipelines.

Waste heat recovery equipment is used to store heat recovered from high-temperature slag particles and further utilize it according to subsequent settings.

Preferably, the waste heat recovery device comprises:

A steam drum, the steam drum comprising a steam drum water inlet, a steam drum water outlet, a saturated steam outlet and a steam-water mixture inlet;

Water tank;

The drum water inlet is connected to the water tank, the cooling medium inlet is connected to the drum water outlet, and the cooling medium outlet is connected to the steam-water mixture inlet.

The piping system separates saturated water and saturated steam in the drum, after which saturated steam (about 180°C) can be used by downstream users, such as heating buildings or low-pressure boilers. The water tank is used to add water to the drum to keep the water level in the drum constant after the steam is discharged.

Preferably, the partition-type high-temperature solid slag waste heat recovery system also includes a feeder and a dust collector arranged below the slag outlet, the inlet end of the dust collector is connected to the air outlet of the partition-type heat exchanger through a pipe, and the outlet of the dust collector is connected to the waste heat recovery equipment through a pipe.

After the slag particles exchange heat with the heat exchange tube group, the extra heat of the slag particles can be further diffused to the waste heat recovery equipment through the pipeline. Preferably, the heat exchanger includes a cylinder, the slag particle inlet and the slag particle outlet are respectively arranged at the upper end and the bottom of the cylinder, an air outlet is arranged at the upper part of one side wall of the cylinder, and an air inlet duct and a fan are arranged at the lower part of the other side wall; preferably, a guide plate is arranged at the upper part of the cylinder to guide the slag particles to flow evenly; preferably, an air distribution device is arranged at the lower part of the cylinder.

The air distribution device can speed up the diffusion of slag heat through the pipeline and accelerate the process of heat transfer to the waste heat recovery equipment.

Preferably, the heat exchanger comprises a metal shell-and-tube structure cylinder, the slag inlet and the slag outlet are respectively arranged on the cylinder side wall on the cooling medium outlet side and the cylinder side wall on the cooling medium inlet side, a spiral plate with interconnected through holes is arranged in the cylinder, and the heat exchange tube is inserted in the cylinder. The through hole; preferably, the cylinder shell adopts a water-cooled wall structure, including a cylinder heat exchange tube sleeve, a core shaft heat exchange tube, a spiral plate arranged inside the cylinder, and a heat exchange tube group passing through the spiral plate.

The use of a spiral plate heat exchanger similar to a rolling bed can achieve rapid cooling of high-temperature slag particles (not less than 20°C/min) while producing saturated steam.

Preferably, the heat exchanger is a metal shell and tube structure, which is divided into a superheating section and a vaporization section from top to bottom. A first heat exchange tube group and a second heat exchange tube group are respectively arranged in the superheating section and the vaporization section, wherein the inlet end of the first heat exchange tube group is connected to the saturated steam outlet of the drum, the outlet end of the first heat exchange tube group is connected to the steam network through a buffer steam tank through a pipeline, the inlet end of the second heat exchange tube group is connected to the saturated water outlet of the drum, the outlet end of the second heat exchange tube is connected to the saturated steam-water mixture inlet of the drum, and the heat exchanger has vertically spaced guide plates and a distribution chute located below the slag inlet, and the guide plates are provided with through holes for the heat exchange tubes to pass through.

The guide plate effectively supports the heat exchange tube group and avoids the deviation of slag flow, so that the slag flow in each area is uniform. The distribution chute can rotate 360 degrees and can also pitch up and down in the range of 0-90 degrees (0 degrees is horizontal placement and 90 degrees is vertical placement). When distributing, the chute rotates and pitches to evenly spread the high-temperature slag.

Preferably, the partition-type high-temperature solid slag waste heat recovery system further comprises a disturbance rod penetrating between the first heat exchange tube and the second heat exchange tube in the heat exchanger, one end of which is fixed to a fixed seat, and the other end extends out of the heat exchanger; disturbance arms are arranged axially at intervals on the body of the disturbance rod, and the axis of the disturbance arm forms an angle with the axis of the disturbance rod, and preferably, adjacent disturbance arms are installed in an anti-symmetrical manner;

A driving device, wherein the output end of the driving device is connected to an end of the disturbance rod extending out of the heat exchanger.

The disturbance rod and the disturbance arm thereon can prevent slag particles between the heat exchange pipes from being blocked.

Preferably, the driving device is in the form of a worm and worm gear, wherein the worm gear is coaxially connected to the end of the disturbance rod.

Preferably, the partition-type high-temperature solid slag waste heat recovery system further comprises at least one high-temperature storage tank arranged between the granulation device and the partition-type heat exchanger, the top of the high-temperature storage tank is provided with a feed inlet connected to the slag outlet of the granulation device, and the bottom of the high-temperature storage tank is provided with an outlet connected to the slag inlet of the heat exchanger; an air inlet, an air inlet duct, and a fan are arranged at the lower part of one side wall of the high-temperature storage tank, an air outlet is arranged at the upper part of the other side wall opposite to the air outlet, and is connected to the inlet end of the dust collector through a pipeline, and the dust collector outlet .... The pipeline is connected to the waste heat recovery equipment; preferably, a temperature detection device is provided in the pipeline connected to the dust collector; preferably, an air distribution device connected to the air inlet pipeline is provided in the lower part of the high-temperature storage tank; more preferably, the side wall of the high-temperature storage tank is provided with a filter screen, a heat preservation material and an outer shell from the inside to the outside.

As the link between slag granulation and slag particle heat exchange, the high-temperature storage tank not only facilitates the management of slag produced at different powers to avoid waste, but also enables flexible regulation of the partition heat exchanger.

In order to ensure that the high-temperature solid slag particles in the high-temperature storage tank will not stick together, the slag particles in the high-temperature storage tank need to be cooled. The power of the fan can be controlled by the temperature detection device. The hot air from the high-temperature storage tank is sent to the waste heat recovery equipment after dust removal by the dust collector, and then enters the air purifier for purification through the fan, and is discharged after reaching the emission index.

Preferably, the waste heat recovery equipment also includes a superheater and/or an evaporator, the superheater inlet is connected to the saturated steam outlet of the drum, and the superheater outlet is connected to the steam network; the evaporator inlet is connected to the water tank, and the evaporator outlet is connected to the water supply port of the drum.

The superheater can further heat the saturated steam output from the drum, and further convert it into superheated steam (about 220°C) to enter the steam network, which is suitable for use in power plants. At this time, the heat source for heating the saturated steam into superheated steam can come from the hot air blown out by the above-mentioned high-temperature storage tank or the heat exchanger air distribution device. At the same time, after the saturated steam is heated to superheated steam, the heat source can further preheat the water from the water tank in the evaporator. Afterwards, the preheated water in the evaporator enters the drum. Preferably, the hot air first passes through the superheater and then the evaporator in sequence, so as to use the most heat to heat the saturated steam into superheated steam.

Preferably, the superheater and the evaporator are arranged in a closed container, an air inlet is provided on the closed container and is connected to the dust collector outlet through a pipeline; the closed container outlet is connected to the air purifier through a pipeline and a fan; preferably, the evaporator and the superheater adopt a coil structure; preferably, a water treatment device is also included between the evaporator and the water tank.

The water treatment device is used to remove oxygen and salt from water.

Preferably, the gas quenching granulation device comprises:

A granulation chamber of a box structure, wherein a slag flow inlet is arranged at the top of the granulation chamber, a slag flow chute is arranged above the slag flow inlet; and a slag flow outlet is arranged at the bottom of the granulation chamber;

A high-pressure nozzle is arranged on the side wall of the granulation chamber, the outlet of the high-pressure nozzle faces the slag flow inlet, and an air outlet, a dust collector and a fan are arranged on the upper part of the other side wall of the granulation chamber. Preferably, the high-pressure nozzle is a Laval nozzle.

The granulation is done by high-pressure air impact, which is a kind of dry granulation and will not produce waste water and polluting gas.

Preferably, the gas-water granulation device comprises:

A high-pressure nozzle is arranged on the side wall of the granulation chamber, the outlet of the high-pressure nozzle is toward the slag flow inlet, and an air-water outlet and a filter, an air-water separation device, and a fan are arranged on the upper part of the other side wall of the granulation chamber. The high-pressure nozzle is an atomizing nozzle or a gas-liquid dual-fluid nozzle.

The ratio of the air-water mixture can be regulated by a compressed air flow control valve and a water flow control valve.

Preferably, the rotor granulation device comprises:

A granulating chamber of a box structure, wherein a slag flow inlet is arranged at the top of the granulating chamber, a slag flow outlet is arranged at the bottom, an air inlet, an air inlet duct and a fan are arranged at the lower part of one side wall of the granulating chamber, and an air outlet, an air outlet duct, a dust collector and a fan are arranged at the upper part of the other side wall of the granulating chamber;

A rotating motor, wherein the rotating motor is arranged at the center of the granulating chamber;

The rotating cup is arranged at the output end of the rotating motor.

Preferably, the heat exchanger comprises:

The drum body, the slag particle inlet is arranged at the side wall of the drum body near the cooling medium outlet, and the slag particle outlet is arranged at the side wall of the drum body near the cooling medium inlet; the drum body is installed in a downward tilt toward the cooling medium outlet side, so that the slag particles move from the slag particle inlet to the slag particle outlet; preferably, the drum body is composed of an inner cylinder, an outer cylinder and a heat preservation material between the inner cylinder and the outer cylinder;

A plurality of lifting plates are arranged at intervals on the inner wall of the drum along the circumferential direction of the inner wall of the drum, and the lifting plates are L-shaped;

The drum driving device comprises a gear ring, a driving motor and a supporting structure arranged outside the drum body, and the drum driving device is used to roll the drum body, wherein:

The heat exchange tube group is arranged at the center of the drum body, the inner wall of the drum body and the inner side of the lifting plate.

The main function of the lifting plate is to scatter the high-temperature slag particles. The length and installation angle of the lifting plate are determined according to the flow rate of the high-temperature slag particles to be processed.

Preferably, the heat exchange tube group includes a type A heat exchange tube group and a type B heat exchange tube. The outer wall of the type A heat exchange tube group is vertically provided with multiple fins along the circumferential direction to form a finned tube. The type A heat exchange tube group is located in the center of the drum body, and the fins are preferably ring ribs, column ribs or plate ribs; the type B heat exchange tube group is arranged on the lifting plate or the inner wall of the drum body.

While the lifting plate is throwing the high-temperature slag particles, the B-type heat exchange tube cools the high-temperature slag particles residing in the lifting plate. The A-type heat exchange tube is welded with fins (ring ribs, column ribs, plate ribs, etc. can be used) on the outside to enhance the heat exchange between the high-temperature slag particles and the tube wall. Ring rib fins are preferably used to enhance heat exchange.

The high-temperature slag particles are thrown by the lifting plate in the drum body, and heat is exchanged with the lifting plate and the heat exchange tubes on the drum wall. The high-temperature slag particles in the throwing contact with the finned heat exchange tubes in the center of the drum, and then cooled. The drum body is installed at an angle, and the high-temperature slag particles gradually move to the drum outlet during the rolling process, and heat exchange is completed at the same time.

Preferably, the heat exchange tube group is arranged in the drum body in the form of multiple tube passes, and the number of tube passes is an odd number; preferably, the tube pass resistance of each heat exchange tube is consistent to ensure that there is no biased flow of the cooling medium.

Preferably, the partition-type high-temperature solid slag waste heat recovery system further comprises:

The buffer tank drum has a feed port and a feed pipeline on one side of its side wall, and a discharge port and a discharge pipeline on the other side; the buffer tank drum is installed tilted toward the discharge port to ensure that the slag particles move from the feed end to the discharge end inside the drum;

First material lifting plates are arranged vertically on the inner wall of the drum of the buffer tank at intervals along the circumferential direction of the inner wall of the drum, and the material lifting plates are L-shaped;

The first driving device includes a gear ring arranged on the outer wall of the buffer tank drum, a first driving motor and a corresponding supporting structure.

Preferably, the heat exchanger comprises:

A drum body, wherein the drum body is arranged horizontally, and a feeding device including a slag particle inlet and a discharging device including a slag particle outlet are arranged at both ends of the drum body;

A material guiding spiral plate, the material guiding spiral plate is arranged inside the drum body, and the material guiding spiral plate has a through hole for the heat exchange tube group to pass through;

The supporting wheel device is arranged at the bottom of the cylinder near the discharge device end of the cylinder, and cooperates with the outer annular surface of the supporting ring on the cylinder; the supporting wheel device is arranged at the bottom of the cylinder, and cooperates with the outer annular surface of the supporting ring on the cylinder, and is used to lift the drum cylinder;

The wheel blocking device is arranged at the bottom of the cylinder near the feeding device end of the cylinder and cooperates with the side of the support ring on the cylinder; the wheel blocking device is used to block the inclined drum body to make it roll stably;

The transmission device is arranged at the supporting wheel device; the cylinder is supported by the supporting wheel device and the blocking wheel device, and can perform continuous rotational motion under the drive of the transmission device, wherein:

The heat exchange tube groups are evenly arranged in the cylinder.

It takes about 40 minutes for the slag particles to move from the feed end to the discharge end of the heat exchanger, and the temperature drops from 750°C to below 200°C.

Preferably, the partition-type high-temperature solid slag waste heat recovery system satisfies at least one of the following conditions:

The cylinder is composed of three sections, which are made of heat-resistant stainless steel, stainless steel and alloy steel respectively, forming a high-temperature section, a medium-temperature section and a low-temperature section in sequence;

The transmission device is composed of a main transmission system and an auxiliary transmission system which are mutually self-locking, wherein the main motor of the main transmission system adopts a variable frequency speed regulating motor;

The length of the material guiding spiral plate protruding out of the cylinder is 100 to 200 mm.

The drum body is composed of three sections, which are made of heat-resistant stainless steel, stainless steel and alloy steel respectively. The drum body is divided into a high-temperature section (750℃～550℃), a medium-temperature section (550℃～350℃) and a low-temperature section (less than 350℃); to adapt to the change in the temperature of each section of the heat exchanger from 750℃ to below 200℃, and the use of different materials can save production costs.

The transmission device consists of a main transmission system and an auxiliary transmission system which are self-locking with each other (the auxiliary transmission system cannot be started when the main transmission system is started, and vice versa). The main motor of the main transmission system adopts a variable frequency speed regulating motor, and the rotation speed of the drum body can be adjusted as needed to meet the normal operation of the heat exchanger; when the drum body is under maintenance or the main motor is powered off, the auxiliary transmission system is started.

Preferably, the heat exchanger comprises:

The heat exchange cylinder has a feed box including a slag inlet and a discharge box including a slag outlet at both ends thereof, and a water inlet header and a steam-water header are respectively arranged at the ends of the heat exchange cylinder near the discharge box and the feed box;

Two support and blocking wheel devices are arranged on both sides of the heat exchange cylinder;

A rotary drive device is arranged at the bottom of the middle part of the heat exchange cylinder;

The steam drum and the heat exchanger form a closed circulation system;

The waste heat recovery system includes a superheater, which is provided with a preheating module, a superheating module, and a combustion module in sequence from top to bottom; the steam drum is connected to the preheating module through a water inlet pipe and to the superheating module through a steam outlet pipe. The thermal module is connected;

The bottom of the drum is also provided with a sewage pipe and an emergency water discharge pipe, and the sewage pipe and the emergency water discharge pipe are connected to the sewage expansion tank;

The inlet pipe of the water tank is provided with a regulating valve, preferably an electric regulating valve, and its outlet pipe is connected to the inlet of the water pump, and the outlet pipe of the water pump is connected to the inlet of the superheater; preferably, the water tank is provided with a liquid level meter.

Preferably, the heat exchanger satisfies one or more of the following:

A continuous spiral support tube sheet is welded on the inner wall of the heat exchange tube, and the spiral support tube sheet is distributed in a spiral shape along the axial direction in the heat exchange tube; through holes are correspondingly arranged on the spiral support tube sheet, and the heat exchange tube group is inserted into the through holes of the spiral support tube sheet; flange tube sheets are arranged at both ends of the heat exchange tube, and the two ends of the heat exchange tube are respectively fixed to the two flange tube sheets, and the two flange tube sheets are respectively fixedly connected to the steam-water header and the water inlet header, one end of the heat exchange tube is connected to the water inlet header, and the other end of the heat exchange tube is connected to the steam-water header, the water inlet header is rotatably connected to the water inlet rotary joint, the steam-water header is rotatably connected to the steam outlet rotary joint, and the rotating connection is sealed with graphite material filler; the steam-water header and the water inlet header rotate together with the heat exchange tube;

The heat exchange tube is provided with an inner tube wall and an outer tube wall. The inner tube wall and the heat exchange tube form a heat exchange space. The space between the inner tube wall and the outer tube wall is filled with insulation material. End plates are arranged at the inner and outer tube walls and the ends. A discharge scraper is welded circumferentially between the end plate and the discharge side flange tube sheet.

Preferably, the superheater is provided with a preheating module, a superheating module, and a combustion module in sequence from top to bottom;

The combustion module includes a furnace and a burner, a circulating flue gas pipeline, and a circulating fan;

The superheating module includes a steam inlet, a steam inlet header, a steam outlet header, a steam outlet, and a superheating tube group;

The steam outlet pipeline of the steam drum is connected to the steam inlet of the superheating module, and the saturated steam in the steam drum is transported to the steam inlet header through the steam inlet of the superheating module, and the saturated steam is evenly distributed to the superheating tube group by the steam inlet header;

The preheating module includes a water inlet, a water inlet header, a water outlet header, a water outlet, and a preheating tube group; the outlet pipeline of the water feed pump is connected to the water inlet, and the cold water in the water tank is transported to the water inlet header through the water inlet, and the cold water is evenly distributed to the preheating tube group by the water inlet header; the flue gas after heat exchange in the superheating module flows upward through the preheating module, heats the cold water in the preheating tube group, and after being collected through the water outlet header on the preheating module, the water outlet on the water outlet header is connected to the water inlet pipe of the steam drum to transport hot water to the steam drum.

The present invention also provides a partition-type high-temperature solid slag waste heat recovery method, comprising the following steps:

a) the slag enters a granulation device for slag granulation treatment to obtain slag particles. The air in the slag granulation process contacts the slag for heat exchange and is discharged through a dust collector and a fan. Preferably, the slag granulation treatment adopts gas quenching granulation, gas-water granulation or rotary cup granulation;

b) the slag particles enter the partitioning heat exchanger, in which the slag particles and water or water vapor from the steam drum are indirectly contacted and heat exchanged through the heat exchange tube group, and the water or water vapor absorbs heat and returns to the steam drum and/or superheater and evaporator;

c) The slag particles after heat exchange are sent out through the feeder.

Preferably, in step b), the slag particles fall evenly under the action of the guide plate of the partitioning heat exchanger, and in the process of falling, they come into contact with the air blown out by the air distribution device arranged at the lower part of the partitioning heat exchanger to exchange heat with the air.

Preferably, in step b), the slag particles are indirectly contacted with water or water vapor from the steam drum through the heat exchange tube group, and/or the cylinder heat exchange tube sleeve, and the core shaft heat exchange tube for heat exchange, and the slag particles after heat exchange fall onto the feeder under the push of the spiral plate and are discharged through the feeder.

Preferably, in step b), saturated water from the steam drum enters the second heat exchange tube of the vaporization section of the partition wall heat exchanger, exchanges heat with the high-temperature slag particles to become a saturated water-vapor mixture, and then flows back into the steam drum through the pipeline to achieve steam-water separation; the saturated water vapor in the steam drum flows into the first heat exchange tube of the superheating section of the partition wall heat exchanger under the action of the pressure difference, exchanges heat with the slag particles to form superheated steam, and then is connected to the steam network through the pipeline via the buffer steam tank; preferably, when the slag flow rate is lower than the set value, the steam pipeline of the superheating section is closed.

Preferably, before step b), the slag particles are first temporarily stored in a high-temperature storage tank and then enter the partition heat exchanger. During the temporary storage of the slag particles in the high-temperature storage tank, the hot air generated in the high-temperature storage tank is dedusted by a dust collector and then sent to the waste heat recovery equipment for heat exchange; preferably, a plurality of high-temperature storage tanks are arranged in parallel.

The advantages of the present invention are:

1. The present invention can carry out large-scale waste heat recovery of high-temperature slag particles, and the heat recovery medium used is mainly water. When water vaporizes, it will absorb a large amount of latent heat of vaporization, and the heat transfer coefficient of convection heat transfer and boiling heat transfer between water and the metal pipe wall is very high (heat flux density is on the order of 105W/ ^m2 ), which improves the waste heat recovery efficiency.

2. The present invention avoids heat loss of the intermediate heat transfer medium through direct heat exchange between high-temperature slag particles, heat exchange tube groups, and cooling medium (water). The high-temperature slag particles flow and exchange heat outside the heat exchange tubes, transferring heat to the water or water vapor inside the heat exchange tubes, and eventually generating superheated steam. At the same time, cold water or saturated water can further utilize the remaining waste heat, thereby realizing the ultimate recovery of the waste heat of high-temperature slag particles.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a flow chart of a slag waste heat recovery system according to an embodiment of the present invention.

FIG. 2 is a schematic flow diagram of a slag waste heat recovery system according to another embodiment of the present invention.

FIG3 is a schematic diagram of a flow chart of a slag waste heat recovery system according to another embodiment of the present invention.

FIG. 4 is a schematic diagram of the internal structure of a heat exchanger according to an embodiment of the present invention.

FIG5 is a schematic flow diagram of a slag waste heat recovery system according to a modified embodiment of the present invention.

FIG6 is a schematic flow diagram of a slag waste heat recovery system according to another modified embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a high-temperature storage tank of the present invention.

FIG8 is a schematic diagram of the structure and flow of another granulation device of the present invention.

FIG. 9 is a schematic diagram of the structure and flow of another granulation device of the present invention.

FIG. 10 is a schematic structural diagram of a heat exchanger according to the present invention.

FIG. 11 is a schematic cross-sectional view of a heat exchanger according to the present invention.

FIG. 12 is a schematic diagram of the structure of the buffer tank drum of the present invention.

FIG. 13 is a schematic diagram of the cross-sectional structure of the buffer tank drum of the present invention.

FIG. 14 is a schematic diagram of the structure of another heat exchanger of the present invention.

Figure 15 is an enlarged schematic diagram of the A-A section of Figure 14.

FIG. 16 is a cross-sectional view of a drum body of another heat exchanger of the present invention.

FIG. 17 is a side view of FIG. 16 .

FIG. 18 is a cross-sectional view of a feed device of another heat exchanger of the present invention.

Fig. 19 is an enlarged schematic diagram of the B-B section of Fig. 1 .

FIG. 20 is a cross-sectional view of a discharge device of another heat exchanger of the present invention.

Figure 21 is an enlarged schematic diagram of the C-C section of Figure 1.

FIG. 22 is a three-dimensional view of a material guide spiral plate of another heat exchanger of the present invention.

FIG. 23 is a schematic flow chart of a slag waste heat recovery system according to yet another embodiment of the present invention.

FIG. 24 is a schematic structural diagram of a heat exchanger according to yet another embodiment of the present invention.

FIG. 25 is a schematic diagram of the structure of a heat exchange tube of a heat exchanger according to yet another embodiment of the present invention.

FIG. 26 is a schematic structural diagram of a superheater according to yet another embodiment of the present invention.

Detailed ways

Reference will now be made in detail to embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar reference numerals in the drawings and description have been used to refer to like or similar parts of the present invention.

In this and the entire specification and claims, the limitations of various features can be combined and interchanged, unless the context indicates otherwise. For example, all scopes disclosed herein include various components and devices, as long as the functions of these components and devices are the same, it is indicated that they can be replaced with each other.

Example 1

See Figure 1, which shows a partition-type high-temperature solid slag waste heat recovery system:

The granulation device 11 is a gas quenching granulation device, which includes:

The granulation chamber 111 is a box structure, with a slag flow inlet 1111 at the top, and a slag chute 1100 above the slag flow inlet 1111; a high-temperature slag outlet 1112 is provided at the bottom of the granulation chamber 111;

The high-pressure nozzle 112 is a supersonic nozzle, which is arranged on the upper part of one side wall of the granulation chamber 111, and the outlet of the high-pressure nozzle 112 corresponds to the high-temperature molten slag 1200 entering from the slag flow inlet 1111; preferably, the high-pressure nozzle 112 is connected to the air compressor 113, the air processor 114, and the fan 115; the upper part of the other side wall of the granulation chamber 111 is provided with an air outlet 1113, a dust collector 119, and a fan 120; more preferably, the high-pressure nozzle 112 is a Laval nozzle; the dust collector 119 is a cyclone dust collector or a bag dust collector;

The partition wall heat exchanger 12 comprises a cylinder 121, which is a metal shell and tube structure, with a cooling medium inlet 1211 and a cooling medium outlet 1212 at both ends, and the cooling medium inlet 1211 and the cooling medium outlet 1212 are respectively connected to the waste heat recovery equipment; preferably, a cooling medium diversion device 1215 is provided on the side of the cooling medium outlet 1212; a feed port 1213 is provided on the side wall of the cylinder near the cooling medium outlet 1212, and is connected to the high-temperature slag outlet 1112 of the granulating device 11 through a conveying pipeline; a low-temperature slag outlet 1214 is provided on the side wall of the cylinder 121 on the cooling medium inlet 1211 of the partition wall heat exchanger 12; a spiral plate 122 is provided inside the partition wall heat exchanger 12, and a plurality of through holes on the spiral plate 122 are connected to each other, and a plurality of heat exchange tube groups 123 are inserted in the through holes; preferably, a scraper plate is welded on the outer surface of the outlet side of the cylinder along the circumferential direction;

The feeder 125 is disposed under the low-temperature slag outlet 1214 of the partitioning heat exchanger 12. Preferably, the feeder 125 is a spiral feeder.

The waste heat recovery equipment comprises:

The steam drum 13 is connected to the cooling medium inlet 1211 of the partitioning heat exchanger 12 through a downcomer and a circulating pump 14; the cooling medium outlet 1212 of the partitioning heat exchanger 12 is connected to the steam-water mixture inlet of the steam drum 13 through a pipeline; the saturated steam pipe of the steam drum 13 is connected to the steam network; the water supply pipeline of the steam drum 13 is connected to the water tank 118 via a water pump 116, a water treatment device 117, and a water pump 116'.

Preferably, the outer shell of the cylinder 121 of the rolling bed heat exchanger 12 adopts a water-cooled wall structure, including a cylinder heat exchange tube sleeve 1216, a core shaft heat exchange tube 124, a spiral plate 122 arranged inside the cylinder 121, and a heat exchange tube group 123 passing through the spiral plate 122.

The slag waste heat recovery method of Example 1 is:

1) The slag enters the granulation device for slag granulation treatment to obtain slag particles. The air in the slag granulation process contacts the slag for heat exchange and is discharged through the dust collector and fan;

2) The slag particles enter the partition-type heat exchanger, where the slag particles and water or water vapor from the steam drum are indirectly contacted and heat exchanged through the heat exchange tube group, and the water or water vapor absorbs heat and returns to the steam drum and/or superheater and evaporator for heat exchange; the low-temperature slag particles after heat exchange fall onto the feeder under the push of the spiral plate 22, and the low-temperature slag particles are discharged through the feeder;

Example 2

See Figure 2, which shows a variation of a partition-type high-temperature solid slag waste heat recovery system:

The granulation device 21 is a gas quenching granulation device, comprising:

The granulation chamber 211 is a box structure, with a slag flow inlet 2111 on the top, and a slag chute 2100 above the slag flow inlet 2111; a high-temperature slag discharge port 2112 is provided at the bottom of the granulation chamber 211;

The high-pressure nozzle 212, which is a supersonic nozzle, is arranged on the upper part of one side wall of the granulation chamber 211, and the outlet of the high-pressure nozzle 212 corresponds to the high-temperature molten slag 2200 entering from the slag flow inlet; the upper part of the other side wall of the granulation chamber 211 is provided with an air outlet 2113, a dust collector 213 and a fan 214; preferably, the high-pressure nozzle 212 is connected to an air compressor 215, an air processor 216, and a fan 214'; more preferably, the high-pressure nozzle 212 is a Laval nozzle.

The partition heat exchanger 22 comprises a cylinder 221, the upper end of which is provided with a slag inlet 2211 and a valve, corresponding to the high-temperature slag discharge port 2112 of the granulating device 1; an air outlet 2212 is provided at the upper part of one side wall of the cylinder 221, and an air inlet duct 2213 and a fan 2214 are provided at the lower part of the other side wall; a slag outlet 2215 is provided at the bottom of the cylinder 221 and valves; a heat exchange tube 222 is arranged in the cylinder 221, and the two ends of the heat exchange tube 222, namely the water inlet and the water outlet, are located outside the cylinder 221 and are connected to the waste heat recovery device 25 through a pipeline; preferably, a guide plate 223 for guiding the slag particles to flow evenly is arranged in the upper part of the cylinder 221 under the slag particle inlet 2211; more preferably, an air distribution device 224 is arranged in the lower part of the cylinder 221, and preferably, the air distribution device 224 is an air distribution plate;

The feeder 23 is disposed below the slag outlet 2215 of the cylinder 221; preferably, it is a screw feeder or a belt conveyor;

The dust collector 24 has its inlet end connected to the air outlet 2212 of the cylinder 221 of the partition-type heat exchanger 22 through a pipeline and a valve F1; the outlet of the dust collector 24 is connected to the waste heat recovery device 25 through a pipeline.

Preferably, the waste heat recovery device 25 comprises:

The superheater 251 and the evaporator 252 are arranged in a closed container 253. The closed container 253 is provided with an air inlet 2531 and connected to the outlet of the dust collector 24 through a pipeline; the outlet 2532 of the closed container 25 is connected to the air purifier 255 through a pipeline and a fan 254; preferably, the evaporator 252 and the superheater 251 adopt a coil structure;

The steam drum 256 has an inlet connected to the water outlet of the heat exchange tube 222 through a pipeline, and the saturated steam outlet of the steam drum 256 is connected to the inlet of the superheater 251 through a pipeline and a valve 257, and the outlet pipeline of the superheater 251 is connected to the steam network; the water supply port of the steam drum 256 is connected to the outlet of the evaporator 252 through a pipeline and a water pump 257', and the inlet of the evaporator 252 is connected to the water tank 258 through a pipeline and a water pump 257". Preferably, a water treatment device 259 is provided in the inlet pipeline of the evaporator 252.

The slag waste heat recovery method of Example 2 is:

2) The slag particles enter the partitioning heat exchanger, where the slag particles are indirectly contacted with water or water vapor from the steam drum through the heat exchange tube group for heat exchange, and the water or water vapor absorbs heat and then returns to the steam drum and/or superheater and evaporator for heat exchange; the slag particles fall evenly under the action of the guide plate of the partitioning heat exchanger, and during the falling process, they contact the air blown out by the air distribution device arranged at the lower part of the partitioning heat exchanger, and the falling time is delayed while the slag particles exchange heat with the air;

3) The feed water in the partition heat exchanger is provided by the steam drum, and the feed water returns to the steam drum after absorbing heat; the heat of the hot air from the partition heat exchanger is transferred to the superheater, and finally the water is converted into superheated steam through the superheater and output to the outside.

Example 3

Referring to FIG. 3 , it shows another variation of a partition-type high-temperature solid slag waste heat recovery system:

The heat exchanger 31 is a metal shell and tube structure, which is divided into a superheating section 3101 and a vaporization section 3102 from top to bottom. The first heat exchange tube 32 and the second heat exchange tube 33 are respectively arranged in the superheating section 3101 and the vaporization section 3102.

The drum 34 is provided with a water inlet 341, a saturated steam outlet 342, a saturated water outlet 343, and a saturated steam-water mixture inlet 344; wherein the saturated steam outlet 342 is connected to the inlet end of the first heat exchange tube 32 in the superheating section 3101 of the heat exchanger 31 through a pipeline, and the outlet end of the first heat exchange tube 32 is connected to the steam network through a pipeline via a buffer steam tank 35; the saturated water outlet 343 is connected to the inlet end of the second heat exchange tube 33 in the vaporization section 3102 of the heat exchanger 31 through a pipeline and a circulating pump 36, and the outlet end of the second heat exchange tube 33 is connected to the saturated steam-water mixture inlet 344 of the drum 34 through a pipeline;

A plurality of guide plates 37 are vertically spaced apart and arranged in the heat exchanger 31, and are provided with through holes for the first and second heat exchange tubes 32 and 33 to pass through;

A charging distributor 38 is provided on the top of the heat exchanger 31;

The material distribution chute 39 is arranged in the heat exchanger 31 and is located below the charging distributor 38; the high-temperature slag particles 3100 pass through the charging distributor 38 and enter the heat exchanger 31 through the material distribution chute 39;

The discharger 310 is disposed at the bottom discharge port of the heat exchanger 31 .

Further referring to FIG. 4 , the partition-type high-temperature solid slag waste heat recovery system also includes:

The disturbance rod 3111 is inserted between the first heat exchange tube 32 and the second heat exchange tube 33 in the heat exchanger 31, one end of which is fixed to a fixing seat 3112, and the other end extends out of the heat exchanger 31; disturbance arms 3113 are arranged at intervals along the axial direction on the body of the disturbance rod 3111, and the axis of the disturbance arm 3113 forms an angle with the axis of the disturbance rod 3111. Preferably, adjacent disturbance arms 3113 are installed in an anti-symmetrical manner;

The driving device 3114 has an output end connected to an end of the disturbance rod 3111 extending out of the heat exchanger 31 .

Preferably, the driving device 3114 is in the form of a worm gear, wherein the worm gear is coaxially connected to the end of the disturbance rod 3111.

The slag waste heat recovery method of Example 3 is:

1) The high-temperature slag particles are evenly spread on the top of the heat exchanger by the charging distributor and the distribution chute to form a horizontal material surface, which flows downward by gravity;

2) Driven by the circulating pump, saturated water flows out of the steam drum and enters the second heat exchange tube of the evaporation section of the heat exchanger. After heat exchange with the high-temperature slag particles, it becomes a saturated steam-water mixture, and then flows back into the steam drum through the pipeline to achieve steam-water separation;

3) The saturated steam in the drum flows into the first heat exchange tube of the superheating section of the heat exchanger under the action of the pressure difference, exchanges heat with the high-temperature slag particles to form superheated steam, then flows into the buffer steam tank through the pipeline, and finally enters the steam pipe network;

4) The high-temperature slag particles are transformed into low-temperature slag particles through heat exchange with the first and second heat exchange tubes, move to the discharge port at the bottom of the heat exchanger, and are discharged from the heat exchanger through the discharger.

Preferably, when the slag flow rate is small, the steam pipeline of the superheating section is closed and switched to saturated steam production to ensure that the pipeline outlet of the vaporization section is a steam-water mixture.

Example 3 is mainly divided into three cycles:

1. The heat exchange pipeline is arranged in the vaporization section and superheating section of the heat exchanger. Driven by the circulating pump, saturated water flows out of the steam drum and enters the vaporization section. After heat exchange with high-temperature slag particles, it becomes a saturated water and steam mixture and flows into the steam drum to achieve steam-water separation.

2. Under the action of pressure difference, the saturated steam in the steam drum flows into the superheating section of the heat exchanger, exchanges heat with the high-temperature slag particles, forms superheated steam, flows into the buffer steam tank, and finally enters the steam pipeline network.

3. The high-temperature slag particles are transported to the loading distributor and evenly spread on the top of the heat exchanger through the distribution chute to form a horizontal material surface. The high-temperature slag particles flow downward inside the heat exchanger by gravity. The heat exchange tubes and guide plates constrain the flow of the slag particles to prevent the slag particles from drifting in a macroscopic range. When the slag particles move to the bottom of the heat exchanger, they are discharged from the heat exchanger through the discharger, and the low-temperature slag particles enter the next processing link.

When working, the device should ensure that the outlet of the pipeline of the vaporization section of the heat exchanger is a mixture of water and steam; the material distribution of the device should ensure that the material surface is flat and there is no height difference between the material surfaces of each guide plate; the discharger should be able to control the flow rate of the slag material.

Example 4

Referring to FIG. 5 and FIG. 7 , Example 4, based on Example 1, further comprises:

At least one high temperature storage tank 55 is provided between the granulation device 111 and the partition wall heat exchanger 52 The top of the high-temperature storage tank 55 is provided with a feed port 551 and an inlet gate connected to the high-temperature slag outlet 1112 of the granulating device 111; the bottom of the high-temperature storage tank 55 is provided with an outlet 552 and an outlet gate connected to the feed port 5213 of the cylinder 521 of the partition-type heat exchanger 52; an air inlet 553, an air inlet duct, and a fan 554 are provided at the lower part of one side wall of the high-temperature storage tank 55, and an air outlet 555 is provided at the upper part of the other side wall opposite to the other side wall, and is connected to the dust collector 57 through a pipe and a valve; preferably, a temperature detection device 56 is provided in the pipe; preferably, an air distribution device 556 connected to the air inlet duct is provided at the lower part of the high-temperature storage tank 55. In this embodiment, the air distribution device 556 is an air distribution plate; more preferably, the side wall of the high-temperature storage tank 55 is provided with a filter screen 5501, a heat-insulating material 5502, and a shell 5503 from the inside to the outside;

The waste heat recovery device comprises:

The steam drum 53 is connected to the cooling medium inlet 5211 of the partitioning heat exchanger 52 through a downcomer and a circulation pump 54, and the cooling medium outlet 5212 of the partitioning heat exchanger 2 is connected to the steam-water mixture inlet of the steam drum 53 through a pipeline circulation pump 54';

The superheater 58 and the evaporator 59 are arranged in a closed container 510. The closed container 510 is provided with an inlet 51001 and an outlet 51002. The inlet end is connected to the outlet pipe of the dust collector 57 through a pipeline; the outlet end of the closed container 510 is connected to the fan 520' and the air purifier 531 through a pipeline; the saturated steam pipe of the steam drum 53 is connected to the inlet end of the superheater 58 through the saturated steam valve 533, and the outlet pipe of the superheater 58 is connected to the steam network; the inlet pipe of the evaporator 59 is connected to the water treatment device 517 and the water pump 516 to the water tank 518, and the outlet pipe of the evaporator 59 is provided with a water pump 532 and connected to the water supply pipe of the steam drum 53.

The slag particles are first temporarily stored in a high-temperature storage tank and then enter a partition heat exchanger. During the temporary storage of the slag particles in the high-temperature storage tank, the hot air generated in the high-temperature storage tank is dedusted by a dust collector and then sent to the waste heat recovery equipment for heat exchange; preferably, multiple high-temperature storage tanks are arranged in parallel.

Example 5

Referring to FIG. 6 and FIG. 7 , Example 5, based on Example 2, further includes:

At least one high-temperature storage tank 66 is disposed between the granulation device 211 and the partitioning heat exchanger 22 .

The top of the high temperature storage tank 66 is provided with a feed port 551 and an inlet gate connected to the discharge port at the bottom of the granulation chamber 211; the bottom of the high temperature storage tank 66 is provided with an outlet 552 and an outlet gate connected to the slag inlet 2211 of the cylinder 221 of the partition heat exchanger 22; the lower part of one side wall of the high temperature storage tank 66 is provided with an air inlet 553 and an air inlet duct, a fan 554, and an air outlet 555 is arranged on the upper part of the other side wall opposite to it, and is connected to the inlet pipeline of the dust collector 24 through a pipeline; preferably, a temperature detection device 67 is arranged in the pipeline; an air distribution device 556 connected to the air inlet duct is arranged at the lower part of the high-temperature storage tank 66, and the air distribution device 556 is preferably an air distribution plate, and is connected to the fan; more preferably, the side wall of the high-temperature storage tank 66 is provided with a filter screen 5501, a heat-insulating material 5502, and an outer shell 5503 from the inside to the outside.

Example 6

Referring to FIG8 , it shows an air-water granulation device as another embodiment of the granulation device, which can replace the gas quenching granulation device in the above-mentioned embodiment. The air-water granulation device includes:

The granulating chamber 611 of the box structure has a slag flow inlet 6111 at the top, a slag chute 6100 above the slag flow inlet 6111; and a slag flow outlet 6112 at the bottom of the granulating chamber 611;

The high-pressure nozzle 612 is an atomizing nozzle or a gas-liquid dual-fluid nozzle, which is arranged on the upper side wall of the granulation chamber 611. The outlet of the high-pressure nozzle 612 corresponds to the high-temperature molten slag 6200 entering from the slag flow inlet 6111; the high-pressure nozzle 612 is connected to the gas-water mixer 629, and the gas-water mixer 629 is respectively connected to the compressed air pipeline and the air flow control valve 6291 and the water pipeline and the water flow control valve 6292; the upper part of the other side wall of the granulation chamber 611 is provided with a gas-water outlet 6114 and a filter 626, a gas-water separation device 627, and a fan 628.

Example 7

Referring to FIG. 9 , it shows a rotary cup granulation device as another embodiment of the granulation device, which can replace the gas quenching granulation device in the above-mentioned embodiment. The rotary cup granulation device includes:

The granulating chamber 711 of the box structure has a slag flow inlet 7111 at the top and a slag flow outlet 7112 at the bottom; the lower part of the side wall of the granulating chamber 711 is provided with air inlets 7115, 7115', air inlet ducts and fans 734, 734'; the upper part of the other side wall of the granulating chamber 711 is provided with an air outlet 7113, an air outlet duct, a dust collector 719 and a fan 720;

A rotating motor 735 is vertically arranged in the center of the granulating chamber 711;

The rotating cup 736 is disposed at the output end of the rotating motor 735 .

Example 8

Referring to FIG. 10 and FIG. 11 , the structure of the partition wall heat exchanger 22 in Embodiment 2 is further shown, including:

The drum body 81 is provided with a cooling medium inlet 8101 and a cooling medium outlet 8102 at both ends thereof, and are respectively connected to external pipelines through a rotary joint; a high-temperature slag feed port and a feed pipeline 8103 are provided near the cooling medium outlet 8102 on the side wall of the drum body 81, and a low-temperature slag discharge port and a discharge pipeline 8104 are provided near the cooling medium inlet 8101 on the side wall of the drum body 81; the drum body 81 is installed in a downward tilt toward the cooling medium outlet side to ensure that the high-temperature slag moves from the feed end to the discharge end inside the drum body 81;

A plurality of lifting plates 82, each of which is L-shaped, and one end of each lifting plate 82 is vertically arranged on the inner wall of the drum body 81 at intervals along the circumferential direction of the inner wall of the drum body 81;

A plurality of heat exchange tubes 83 are respectively arranged at the center of the drum body 81, the inner wall of the drum body 81 and the inner side of the lifting plate 82;

The driving device (not shown) includes a gear ring arranged outside the drum body 81, a driving motor and a corresponding supporting structure.

Preferably, the drum body 81 is composed of an inner cylinder 811 , an outer cylinder 812 , and a heat-insulating material 813 between the inner cylinder 811 and the outer cylinder 812 .

Preferably, the heat exchange tube 83 includes an A-type heat exchange tube group 831 and a B-type heat exchange tube group 832; wherein, the outer wall of the A-type heat exchange tube group 831 is vertically provided with fins 8311 along the circumferential direction to form a finned tube; the A-type heat exchange tube group 831 is arranged in the center of the drum body 81, and preferably, the fins 8311 are ring ribs, column ribs or plate ribs. The B-type heat exchange tube group 832 is arranged on the lifting plate 82 or the inner wall of the drum body 81.

Preferably, the heat exchange tube 83 is arranged in the drum body in a multi-tube pass manner, and the number of tube passes is an odd number; preferably, the tube pass resistance of each heat exchange tube is consistent.

Example 9

Referring to FIG. 12 and FIG. 13 , on the basis of Example 8, a buffer tank drum 91 may be further connected in series before the high-temperature slag particle feed port of the partitioning heat exchanger 22, including:

The buffer tank drum 91 has a feed port and a feed pipe 9101 on one side of its side wall and an outlet on the other side. The material port and discharge pipe 9102; the buffer tank drum 91 is installed tilted toward the discharge port to ensure that the high-temperature slag particles move from the feed end to the discharge end inside the cylinder;

A plurality of first material lifting plates 92, each of which is L-shaped, and one end of which is vertically arranged on the inner wall of the cylinder along the circumferential direction of the inner wall of the cylinder of the buffer tank drum 91 at intervals;

A first driving device (not shown), which includes a gear ring disposed on the outer wall of the drum of the buffer tank, a first driving motor and a corresponding supporting structure;

Example 10

Referring to FIG. 14 to FIG. 22 , another structure of the partition wall heat exchanger 22 in Embodiment 2 is further shown, including:

The drum body 101 is horizontally arranged, and mainly consists of a drum body 1011, a material guiding spiral plate 1012, and a heat exchange tube group 1013; the material guiding spiral plate 1012 is welded on the inner wall of the drum body 1011, and a plurality of through holes 10121 are arranged on the material guiding spiral plate 1012; the heat exchange tube group 1013 is penetrated through the through holes on the material guiding spiral plate 1012, and is evenly arranged in the drum body 1011; the drum body 1011 is coated with a heat-insulating layer;

A feeding device 102 and a discharging device 103 are respectively arranged at two ends of the drum body 101;

The supporting wheel device 104 is arranged at the bottom of the drum body 101 near the discharge device end;

The wheel blocking device 105 is arranged at the bottom of the drum body 101 near the feeding device end;

The transmission device 106 is arranged at the supporting roller device 104 ; the drum body 101 is supported by the supporting roller device 104 and the blocking wheel device 105 , and can perform continuous rotational motion under the drive of the transmission device 106 .

The heat exchange tube groups are evenly arranged in the cylinder.

Preferably, the body 1011 of the drum body 101 consists of three sections, which are made of heat-resistant stainless steel, stainless steel and alloy steel respectively, forming a high-temperature section, a medium-temperature section and a low-temperature section in sequence.

Preferably, the transmission device 106 is composed of a main transmission system and an auxiliary transmission system which are self-locking with each other, wherein the main motor of the main transmission system is a variable frequency speed regulating motor.

Referring to FIG. 18 and FIG. 19 , the feeding device 102 of the present invention includes:

The first fixing seat 1021 has a first connecting tube 10211 disposed on its upper portion, and one end of the drum body 101 is inserted into one end of the first connecting tube 10211 of the first fixing seat 1021. The gap between the two is matched and sealed by a sealing device 1024; a feed port 102111 is provided at the top of the tube body 10211, and a feed pipe 10212 is provided; preferably, the distance L between the drum body 1011 extending into the first connecting tube body 10211 of the first fixing seat 1021 and the center line of the feed pipe 10212 is half of the inlet radius of the feed pipe 10212;

The first blocking plate 1022 is inserted into the other end of the first connecting pipe body 10211 of the first fixing seat 1021, and the gap between the two is matched and sealed by a sealing device 1024'; the first blocking plate 1022 is provided with a plurality of fixing holes 10221 for the heat exchange tube group 1013 to pass through, and one end of the heat exchange tube group 1013 is welded to the first blocking plate 1022; preferably, a manhole 10222 is provided in the center of the first blocking plate 1022;

The first rotating pipe 1023 is fixedly connected to the first blocking plate 1022 via a flange.

Referring to FIG. 20 and FIG. 21 , the discharging device 103 of the present invention comprises:

A second fixed seat 1031 is provided with a second connecting tube body 10311 on its upper part, and the other end of the drum body 101 is inserted into one end of the second connecting tube body 10311 of the second fixed seat 1031, and the two are gap-matched and sealed and connected through a sealing device 1035; a smoke exhaust port 103111 is provided on the top of the second connecting tube body 10311, and a smoke pipe 10312 is provided; a discharge port 103112 and a corresponding discharge pipe 10313 are provided on one side of the middle or lower part of the second connecting tube body 10311, and preferably, the discharge pipe 10313 is tangentially arranged along the circumference of the second connecting tube body 10311;

The second blocking plate 1032 is inserted into the other end of the second connecting pipe body 10311 of the second fixing seat 1031, and the two are gap-matched and sealed and connected through a sealing device 1035'; the second blocking plate 1032 is provided with a plurality of fixing holes 10321 for the heat exchange tube group 1013 to pass through, and the other end of the heat exchange tube group 1013 is welded and connected to the second blocking plate 1032; preferably, a manhole 10322 is provided in the center of the second blocking plate 1032;

A second rotating pipe 1033 is fixedly connected to the second blocking plate 1032 via a flange;

A plurality of lifting plates 1034 are evenly arranged on the drum body 1011 located in the second connecting tube body 10311 along the circumference of the inner wall of the drum body 1011; preferably, the angle between the lifting plates 1034 and the tangent direction of the drum body 101 is 40-50°; one end of the lifting plates 1034 is welded to the drum body 101, and the other end is welded to the second blocking plate 1032.

Preferably, the length of the material guiding spiral plate protruding out of the drum body is 100 to 200 mm.

Preferably, the drum body extends into the second connecting tube body, and its end is connected to the second blocking plate 32 The distance between them is 500~800mm.

During operation, the horizontally arranged drum body is supported by the supporting wheel device and the blocking wheel device, and can make continuous rotary motion under the drive of the main transmission system of the transmission device. The rotation of the drum body drives the material guide spiral plate 32 to rotate, and the material guide spiral plate drives the high-temperature solid particles to move from right to left in the gap between the drum body and the outside of the heat exchange tube; the heat exchange medium flows from left to right in the heat exchange tube, which can meet the need of indirect heat transfer and heat exchange without contact between the high-temperature solid particles and the heat exchange medium.

The main transmission system and auxiliary transmission system of the transmission device are self-locking with each other, that is, when the main transmission system is started, the auxiliary transmission system cannot be started, and vice versa; when working, the main transmission system is turned on and the auxiliary transmission system cannot be turned on; the auxiliary transmission system is started only when the drum body is under maintenance or the main motor is powered off.

Embodiment 11

Referring to FIG. 23 to FIG. 26 , another partition-type high-temperature solid slag waste heat recovery system of the present invention is further shown, comprising:

The heat exchanger 1110 includes:

Heat exchange cylinder 11101, with feed box 11102, discharge box 11103 and corresponding feed port 111021, discharge port 111031 and smoke exhaust port 111032 at both ends;

The water inlet header 11104 and the steam-water header 11105 are respectively arranged at the ends of the discharge box 11103 and the feed box 11102 of the heat exchange cylinder 11101;

The water inlet rotary joint 11106 and the steam outlet rotary joint 11107 are respectively arranged on the outer ends of the water inlet header 11104 and the steam-water header 11105 on the heat exchange cylinder 11101;

Two supporting and blocking wheel devices 11108 are arranged on both sides of the heat exchange cylinder 11101;

The rotary drive device 11109 is arranged below the middle of the heat exchange cylinder 11101;

The steam drum 1120 is provided with an ascending pipe 11201, a descending pipe 11202, a steam outlet pipe 11203, a vent pipe 11204, a safety valve 11205, a pressure gauge 11206, a water level gauge 11207, a steam drum drain pipe 11208, an emergency drain pipe 11209, and a water inlet pipe 11210;

The steam drum 1120 is connected to the steam outlet rotary joint 11107 of the heat exchanger 1110 through the ascending pipe 11201, and is connected to the water inlet rotary joint 11106 of the heat exchanger 1110 through the descending pipe 11202; the heat exchanger 1110 and the steam drum 1120 form a closed circulation system; the descending pipe 11202 is connected in parallel with the boosting pipe 11211, and the boosting pump 1130 is provided on the boosting pipe 11211, and the boosting pump 1130 is used to circulate the steam and water. The annular flow provides auxiliary power;

The superheater 1140 is provided with a preheating module 1141, a superheating module 1142, and a combustion module 1143 in order from top to bottom; the steam drum 1120 is connected to the preheating module 1141 through a water inlet pipe 11210, and is connected to the superheating module 1142 through a steam outlet pipe 11203;

The blowdown expansion tank 1150, the end of the downcomer 11202 of the drum 1120 and the water inlet rotary joint 11106 of the heat exchanger 1110 are provided with a heat exchanger blowdown pipe 11212, and the heat exchanger blowdown pipe 11212 is connected to the blowdown expansion tank 1150;

The water tank 116 is provided with a liquid level gauge 1164, and its inlet pipe is provided with an electric regulating valve 1163, and its outlet pipe is connected to the inlet of the water feed pump 1170, and the outlet pipe 1171 of the water feed pump 1170 is connected to the water inlet 11411 of the preheating module 1141 of the superheater 1140, and the water outlet 11412 of the preheating module 1141 is connected to the steam drum 1120 through the water inlet pipe 11210 of the steam drum 1120; a bypass pipe 1172 is arranged between the outlet pipe 1171 of the water feed pump 1170 and the water inlet pipe 11210 of the steam drum 1120, when the superheater 1140 needs to be repaired due to a fault, the preheating module 1141 of the superheater 1140 can be short-circuited through the bypass pipe 1172; the liquid level gauge 1164 on the water tank is interlocked with the electric regulating valve 1163 of the inlet pipe, and the water supply of the water tank is adjusted according to the water tank liquid level to ensure the water volume in the water tank and prevent water shortage accidents.

A continuous spiral support tube sheet 111013 is welded on the inner wall of the heat exchange tube 11101, and the spiral support tube sheet 111013 is spirally distributed along the axial direction in the heat exchange tube 11101; corresponding through holes are arranged on the spiral support tube sheet 111013, and a plurality of heat exchange tubes 111014 are inserted into the through holes of the spiral support tube sheet 111013; flange tube sheets 111015 are arranged at both ends of the heat exchange tube 11101, and both ends of the heat exchange tube 111014 are respectively fixed to the two flange tube sheets 111015, and the two flange tube sheets 111015 ...3 are respectively arranged on the inner wall of the heat exchange tube 111011. 11015 is fixedly connected to the steam-water header 11105 and the water inlet header 11104 respectively, one end of the heat exchange tube 111014 is connected to the water inlet header 11104, and the other end of the heat exchange tube 111014 is connected to the steam-water header 11105, the water inlet rotary joint 11106 is connected to the water inlet header 11104, and the steam-water header 11105 is connected to the steam outlet rotary joint 11107, and the connection is sealed with graphite material packing; the steam-water header 11105 and the water inlet header 11104 rotate together with the heat exchange tube 11101.

Referring to FIG. 25 , the heat exchange tube 11101 is provided with an inner tube wall 111011 and an outer tube wall 111012. The inner tube wall 111011 and a plurality of heat exchange tubes 111014 form a heat exchange space. The space between the inner tube wall 111011 and the outer tube wall 111012 is filled with a heat insulation material. The ends of the inner and outer tube walls 111011 and 111012 are provided with End plate 111016, a plurality of discharge scrapers 111017 are welded on the end plate 111016 and the discharge side flange tube plate 111015.

When the heat exchanger 1110 is in operation, the high-temperature slag enters the heat exchanger tube 11101 through the feed port 111021 and the feed box 11102. The rotary drive device 11109 drives the heat exchanger tube 11101 to rotate, and the spiral support tube sheet 111013 in the heat exchanger tube 11101 provides forward momentum for the high-temperature slag. When the high-temperature slag runs to the discharge box 11103, it is lifted to the discharge port 111031 by the discharge scraper 111017 and discharged from the heat exchanger 1110.

A safety valve 11205 and a pressure gauge 11206 are provided on the top of the steam drum 1120 to detect the pressure inside the steam drum and ensure the safety of the steam drum. When the steam drum pressure exceeds the upper limit of the working pressure, the valve on the vent pipe 11204 is opened to reduce the steam drum pressure to the working pressure, and the valve on the vent pipe 11204 is closed.

A steam drum blowdown pipe 11208 and an emergency water discharge pipe 11209 are provided at the bottom of the steam drum 1120. The emergency water discharge pipe 11209 is connected to the blowdown expansion tank 1150 after merging with the steam drum blowdown pipe 11208. A water level gauge 11207 is provided on the side wall of the steam drum to detect the water level in the steam drum. When the water level in the steam drum exceeds the upper limit of the safe water level, the valve on the emergency water discharge valve is opened to quickly lower the water level to a safe range. When the water level in the steam drum is lower than the lower limit of the safe water level, the system stops working to ensure safe operation.

26 , the superheater 1140 includes a preheating module 1141 , a superheating module 1142 , and a combustion module 1143 from top to bottom.

The combustion module 1143 includes a furnace 11431, a burner 11432, a circulating flue gas pipeline 11433, and a circulating fan 11434. The gas and air are ejected from the burner 11432, and are fully mixed and burned in the furnace 11431 to generate high-temperature flue gas. The high-temperature flue gas is mixed with the low-temperature flue gas drawn back by the circulating fan 11434 to form medium-high temperature flue gas that flows upward to the superheating module 1142. The circulating fan 11434 adjusts the reflux amount of flue gas in the circulating flue gas pipeline 11433, and then adjusts the flue gas temperature entering the superheating module 1142 to ensure that the output superheated steam meets the process requirements.

The superheating module 1142 includes a steam inlet 11421 , a steam inlet header 11422 , a steam outlet header 11423 , a steam outlet 11424 , and a superheating pipe group 11425 .

The steam outlet pipe 11203 of the drum 1120 is connected to the steam inlet 11421 of the superheating module 1142, and the saturated steam in the drum 1120 is transported to the steam inlet circuit through the steam inlet 11421 of the superheating module 1142. In the box 11422, the saturated steam is evenly distributed to the superheating tube group 11425 by the steam inlet manifold 11422. The medium and high temperature flue gas generated by the combustion module 1143 flows upward through the heat module 1142, heating the saturated steam in the superheating tube group 11425 into superheated steam. After the superheated steam is collected through the steam outlet manifold 11423, it is connected to the pipeline through the steam outlet 11424 on the superheating module steam outlet header for users. The flue gas temperature after heat exchange is reduced and continues to flow to the preheating module 1141.

The preheating module 1141 includes a water inlet 11411 , a water inlet manifold 11412 , a water outlet manifold 11413 , a water outlet 11414 , and a preheating tube group 11415 .

The outlet pipeline 1171 of the feed water pump is connected to the water inlet 11411 of the preheating module 1141, and the cold water in the water tank 1160 is transported to the preheating module water inlet header 11412 through the water inlet 11411 of the preheating module 1141, and the cold water is evenly distributed to the preheating tube group 11415 by the water inlet header 11412. The flue gas after heat exchange in the superheating module 1142 flows upward through the preheating module 1141, and the cold water in the preheating tube group 11415 is heated to 90°C, and is collected through the outlet water header 11413 of the preheating module 1141. The water outlet 11414 on the outlet water header 11413 is connected to the water inlet pipe 11210 of the steam drum 1120, and the hot water is transported to the steam drum 1120.

The working process of Example 11 is as follows:

The water feed pump 1170 transports the cold water in the water tank 1160 to the preheating module 1141 of the superheater 1140 through a pipeline. The cold water is preheated by the preheating module 1141 of the superheater 1140 and becomes hot water. The hot water is transported to the steam drum 1120 through the steam drum water inlet pipe 11210. The hot water is transported to the water inlet rotary joint 11106 of the heat exchanger through the downcomer 11202. The water inlet manifold 11104 evenly distributes the hot water to the heat exchange tubes 111014. The high-temperature slag continuously enters the heat exchanger 1110 through the feed port 111021. The heat exchanger 1110 rotates continuously, and the spiral support tube sheet 111013 transports the high-temperature slag to the discharge end. During this process, the high-temperature slag is continuously in contact with the heat exchange tube 111014. The hot water in the heat exchange tube 111014 absorbs the heat carried by the high-temperature material and becomes high-temperature water and saturated steam. Its density decreases, and a density difference is generated with the hot water in the downcomer 11202. Then, it enters the drum 1120 through the riser 11201; the high-temperature water and saturated steam are separated in the drum 1120, and the saturated steam is transported to the superheating module 1142 of the superheater 1140 through the drum steam outlet pipe 11203, and is heated to become superheated steam for external transmission. The high-temperature water enters the drum 1120 and returns to the heat exchanger 1110 through the downcomer 11202, and continues to cycle and absorb heat. The slag after heat exchange is discharged from the heat exchanger 1110 through the discharge port 111031. The slag dust and smoke generated in the heat exchanger 1110 are sent to the dust removal system through the smoke exhaust port 111032

The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

A partition-type high-temperature solid slag waste heat recovery system, characterized by comprising:

A granulation device, wherein the granulation device is preferably a gas quenching granulation device, a gas-water granulation device or a rotary cup granulation device;

A rolling partition heat exchanger, wherein the partition heat exchanger comprises a slag particle inlet and a slag particle outlet corresponding to the slag outlet of the granulating device, and a heat exchange tube group located inside the partition heat exchanger, wherein the heat exchange tube group has a cooling medium inlet and a cooling medium outlet, and the cooling medium is preferably water; and

The waste heat recovery device, the cooling medium inlet and the cooling medium outlet are respectively connected to the waste heat recovery device through pipelines.
The partition-type high-temperature solid slag waste heat recovery system according to claim 1 is characterized in that the waste heat recovery equipment comprises:

A steam drum, the steam drum comprising a steam drum water inlet, a steam drum water outlet, a saturated steam outlet and a steam-water mixture inlet;

Water tank;

The drum water inlet is connected to the water tank, the cooling medium inlet is connected to the drum water outlet, and the cooling medium outlet is connected to the steam-water mixture inlet.
The partition-type high-temperature solid slag waste heat recovery system according to claim 1 or 2 is characterized in that the partition-type high-temperature solid slag waste heat recovery system also includes a feeder and a dust collector arranged below the slag outlet, the inlet end of the dust collector is connected to the air outlet of the partition-type heat exchanger through a pipe, and the outlet of the dust collector is connected to the waste heat recovery equipment through a pipe.
The partition-wall type high-temperature solid slag waste heat recovery system according to any one of claims 1-3 is characterized in that the heat exchanger includes a cylinder of a metal shell and tube structure, the slag inlet and the slag outlet are respectively arranged on the cylinder side wall on the cooling medium outlet side and the cylinder side wall on the cooling medium inlet side, and a spiral plate with mutually connected through holes is arranged in the cylinder, and the heat exchange tube is inserted in the through hole; preferably, the cylinder shell adopts a water-cooled wall structure, including a cylinder heat exchange tube sleeve, a core shaft heat exchange tube, a spiral plate arranged inside the cylinder, and a heat exchange tube group penetrated on the spiral plate.
The partition-type high-temperature solid slag waste heat recovery system according to any one of claims 1 to 3, characterized in that the heat exchanger comprises:

The drum body, the slag particle inlet is arranged at the side wall of the drum body near the cooling medium outlet, and the slag particle outlet is arranged at the side wall of the drum body near the cooling medium inlet; the drum body is installed in a downward tilt toward the cooling medium outlet side, so that the slag particles move from the slag particle inlet to the slag particle outlet; preferably, the drum body is composed of an inner cylinder, an outer cylinder and a heat preservation material between the inner cylinder and the outer cylinder;

A plurality of lifting plates are arranged at intervals on the inner wall of the drum along the circumferential direction of the inner wall of the drum, and the lifting plates are L-shaped;

The drum driving device comprises a gear ring, a driving motor and a supporting structure arranged outside the drum body, and the drum driving device is used to roll the drum body, wherein:

The heat exchange tube group is arranged at the center of the drum body, the inner wall of the drum body and the inner side of the lifting plate.
The partition-type high-temperature solid slag waste heat recovery system according to claim 5 is characterized in that the heat exchange tube group includes a type A heat exchange tube group and a type B heat exchange tube, and the outer wall of the type A heat exchange tube group is vertically arranged with multiple fins along the circumferential direction to form a finned tube, and the type A heat exchange tube group is located in the center of the drum body, and the fins are preferably ring ribs, column ribs or plate ribs; the type B heat exchange tube group is arranged on the lifting plate or the inner wall of the drum body.
The partition-type high-temperature solid slag waste heat recovery system according to claim 6 is characterized in that the heat exchange tube group is arranged in the drum body in the form of multiple tube passes, and the number of tube passes is an odd number; preferably, the tube pass resistance of each heat exchange tube is consistent.
The partition-type high-temperature solid slag waste heat recovery system according to any one of claims 5 to 7, characterized in that the partition-type high-temperature solid slag waste heat recovery system further comprises:

The buffer tank drum has a feed port and a feed pipeline on one side of its side wall, and a discharge port and a discharge pipeline on the other side; the buffer tank drum is installed tilted toward the discharge port to ensure that the slag particles move from the feed end to the discharge end inside the drum;

First material lifting plates are arranged vertically on the inner wall of the drum of the buffer tank at intervals along the circumferential direction of the inner wall of the drum, and the material lifting plates are L-shaped;

The first driving device includes a gear ring arranged on the outer wall of the buffer tank drum, a first driving motor and a corresponding supporting structure.
The partition-type high-temperature solid slag waste heat recovery system according to any one of claims 1 to 3, characterized in that the heat exchanger comprises:

A drum body, wherein the drum body is arranged horizontally, and a feeding device including a slag particle inlet and a discharging device including a slag particle outlet are arranged at both ends of the drum body;

A material guiding spiral plate, the material guiding spiral plate is arranged inside the drum body, and the material guiding spiral plate has a through hole for the heat exchange tube group to pass through;

A supporting wheel device is arranged at the bottom of the cylinder near the discharge device end of the cylinder;

A wheel block device is arranged at the bottom of the cylinder near the feeding device end of the cylinder;

The transmission device is arranged at the supporting wheel device; the cylinder is supported by the supporting wheel device and the blocking wheel device, and can make continuous rotational motion under the drive of the transmission device, wherein:

The heat exchange tube groups are evenly arranged in the cylinder.
The partition-type high-temperature solid slag waste heat recovery system according to claim 9 is characterized in that the heat exchanger satisfies one or more of the following conditions:

The cylinder is composed of three sections, which are made of heat-resistant stainless steel, stainless steel and alloy steel respectively, forming a high-temperature section, a medium-temperature section and a low-temperature section in sequence;

The transmission device is composed of a main transmission system and an auxiliary transmission system which are mutually self-locking, wherein the main motor of the main transmission system adopts a variable frequency speed regulating motor;

The length of the material guiding spiral plate protruding out of the cylinder is 100 to 200 mm.
The partition-type high-temperature solid slag waste heat recovery system according to any one of claims 1 to 3 is characterized in that the heat exchanger comprises:

The heat exchange cylinder has a feed box including a slag inlet and a discharge box including a slag outlet at both ends thereof, and a water inlet header and a steam-water header are respectively arranged at the ends of the heat exchange cylinder near the discharge box and the feed box;

Two support and blocking wheel devices are arranged on both sides of the heat exchange cylinder;

A rotary drive device is arranged at the bottom of the middle part of the heat exchange cylinder;

The steam drum and the heat exchanger form a closed circulation system;

The waste heat recovery device includes a superheater, which is provided with a preheating module, a superheating module, and a combustion module in order from top to bottom; the steam drum is connected with the preheating module through a water inlet pipe and is connected with the superheating module through a steam outlet pipe;

The bottom of the drum is also provided with a sewage pipe and an emergency water discharge pipe, and the sewage pipe and the emergency water discharge pipe are connected to the sewage expansion tank;

The inlet pipe of the water tank is provided with a regulating valve, preferably an electric regulating valve, whose outlet pipe is connected to the inlet of the water pump, and the outlet pipe of the water pump is connected to the inlet of the superheater; preferably, the water The tank is equipped with a liquid level gauge.
The partition-type high-temperature solid slag waste heat recovery system according to claim 11 is characterized in that the partition-type high-temperature solid slag waste heat recovery system satisfies one or more of the following:

A continuous spiral support tube sheet is welded on the inner wall of the heat exchange tube, and the spiral support tube sheet is distributed in a spiral shape along the axial direction in the heat exchange tube; through holes are correspondingly arranged on the spiral support tube sheet, and the heat exchange tube group is inserted into the through holes of the spiral support tube sheet; flange tube sheets are arranged at both ends of the heat exchange tube, and the two ends of the heat exchange tube are respectively fixed to the two flange tube sheets, and the two flange tube sheets are respectively fixedly connected to the steam-water header and the water inlet header, one end of the heat exchange tube is connected to the water inlet header, and the other end of the heat exchange tube is connected to the steam-water header, the water inlet header is rotatably connected to the water inlet rotary joint, the steam-water header is rotatably connected to the steam outlet rotary joint, and the rotating connection is sealed with graphite material filler; the steam-water header and the water inlet header rotate together with the heat exchange tube;

The heat exchange tube is provided with an inner tube wall and an outer tube wall. The inner tube wall and the heat exchange tube form a heat exchange space. The space between the inner tube wall and the outer tube wall is filled with insulation material. End plates are arranged at the inner and outer tube walls and the ends. A discharge scraper is welded circumferentially between the end plate and the discharge side flange tube sheet.
The partition-type high-temperature solid slag waste heat recovery system according to claim 12 is characterized in that:

The superheater is provided with a preheating module, a superheating module and a combustion module in sequence from top to bottom;

The combustion module includes a furnace and a burner, a circulating flue gas pipeline, and a circulating fan;

The superheating module comprises a steam inlet, a steam inlet header, a steam outlet header, a steam outlet, and a superheating tube group;

The steam outlet pipeline of the steam drum is connected to the steam inlet of the superheating module, and the saturated steam in the steam drum is transported to the steam inlet header through the steam inlet of the superheating module, and the saturated steam is evenly distributed to the superheating tube group by the steam inlet header;

The preheating module includes a water inlet, a water inlet header, a water outlet header, a water outlet, and a preheating tube group; the outlet pipeline of the water feed pump is connected to the water inlet, and the cold water in the water tank is transported to the water inlet header through the water inlet, and the cold water is evenly distributed to the preheating tube group by the water inlet header; the flue gas after heat exchange in the superheating module flows upward through the preheating module, heats the cold water in the preheating tube group, and after being collected through the water outlet header on the preheating module, the water outlet on the water outlet header is connected to the water inlet pipe of the steam drum to transport hot water to the steam drum.
The partition-type high-temperature solid slag waste heat recovery system according to any one of claims 1 to 3 is characterized in that the heat exchanger comprises a cylinder, and the slag inlet and the slag outlet are respectively provided At the upper end and bottom of the cylinder, an air outlet is arranged at the upper part of one side wall of the cylinder, and an air inlet duct and a fan are arranged at the lower part of the other side wall; preferably, a guide plate for guiding the slag particles to flow evenly is arranged at the upper part of the cylinder; preferably, an air distribution device is arranged at the lower part of the cylinder.
The partition-type high-temperature solid slag waste heat recovery system according to any one of claims 1-3 is characterized in that the heat exchanger is a metal shell and tube structure, which is divided into an overheating section and a vaporization section from top to bottom, and a first heat exchange tube group and a second heat exchange tube group are respectively arranged in the overheating section and the vaporization section, wherein the inlet end of the first heat exchange tube group is connected to the saturated steam outlet of the drum, the outlet end of the first heat exchange tube group is connected to the steam network through a buffer steam tank through a pipeline, the inlet end of the second heat exchange tube group is connected to the saturated water outlet of the drum, the outlet end of the second heat exchange tube is connected to the saturated steam-water mixture inlet of the drum, and the heat exchanger has a guide plate arranged vertically at intervals and a distribution chute located below the slag inlet, and the guide plate is provided with a through hole for the heat exchange tube to pass through.
The partition-type high-temperature solid slag waste heat recovery system according to claim 6 is characterized in that the partition-type high-temperature solid slag waste heat recovery system also includes a disturbance rod penetrating between the first heat exchange tube and the second heat exchange tube in the heat exchanger, one end of which is fixed to a fixed seat, and the other end extends out of the heat exchanger; disturbance arms are axially spaced on the body of the disturbance rod, and the axis of the disturbance arm forms an angle with the axis of the disturbance rod. Preferably, adjacent disturbance arms are installed in an anti-symmetrical manner;

A driving device, wherein the output end of the driving device is connected to an end of the disturbance rod extending out of the heat exchanger.
The partition-type high-temperature solid slag waste heat recovery system according to claim 7 is characterized in that the driving device is a worm gear type, wherein the worm gear is coaxially connected to the end of the disturbance rod.
The partition-type high-temperature solid-state slag waste heat recovery system according to any one of claims 1-4 or 14 is characterized in that the partition-type high-temperature solid-state slag waste heat recovery system also includes at least one high-temperature storage tank arranged between the granulation device and the partition-type heat exchanger, a feed inlet connected to the slag outlet of the granulation device is arranged at the top of the high-temperature storage tank, and an outlet connected to the slag inlet of the heat exchanger is arranged at the bottom of the high-temperature storage tank; an air inlet, an air inlet duct and a fan are arranged at the lower part of one side wall of the high-temperature storage tank, an air outlet is arranged at the upper part of the other side wall opposite to the high-temperature storage tank, and is connected to the inlet end of the dust collector through a pipeline, and the dust collector outlet is connected to the waste heat recovery equipment through a pipeline; preferably, a temperature detection device is arranged in the pipeline connected to the dust collector; preferably, an air distribution device connected to the air inlet duct is arranged at the lower part of the high-temperature storage tank; more preferably, a filter screen and a heat preservation material are arranged on the side wall of the high-temperature storage tank from the inside to the outside. Materials and shell.
The partition-type high-temperature solid slag waste heat recovery system according to any one of claims 1 to 10 or 14 is characterized in that the waste heat recovery equipment also includes a superheater and/or an evaporator, the superheater inlet is connected to the saturated steam outlet of the drum, and the superheater outlet is connected to the steam pipe network; the evaporator inlet is connected to the water tank, and the evaporator outlet is connected to the water supply port of the drum.
The partition-type high-temperature solid slag waste heat recovery system according to claim 19 is characterized in that the superheater and the evaporator are arranged in a closed container, an air inlet is provided on the closed container and is connected to the dust collector outlet through a pipeline; the closed container outlet is connected to the air purifier through a pipeline and a fan; preferably, the evaporator and superheater adopt a coil structure; preferably, a water treatment device is also included between the evaporator and the water tank.
The partition-type high-temperature solid slag waste heat recovery system according to any one of claims 1 to 20, characterized in that the gas quenching granulation device comprises:

A granulation chamber of a box structure, wherein a slag flow inlet is arranged at the top of the granulation chamber, a slag flow chute is arranged above the slag flow inlet; and a granulated slag flow outlet is arranged at the bottom of the granulation chamber;

A high-pressure nozzle is arranged on the side wall of the granulation chamber, the outlet of the high-pressure nozzle faces the slag flow inlet, and an air outlet, a dust collector and a fan are arranged on the upper part of the other side wall of the granulation chamber. Preferably, the high-pressure nozzle is a Laval nozzle.
The partition-type high-temperature solid slag waste heat recovery system according to any one of claims 1 to 20, characterized in that the gas-water granulation device comprises:

A granulation chamber of a box structure, wherein a slag flow inlet is arranged at the top of the granulation chamber, a slag flow chute is arranged above the slag flow inlet; and a granulated slag flow outlet is arranged at the bottom of the granulation chamber;

A high-pressure nozzle is arranged on the side wall of the granulation chamber, the outlet of the high-pressure nozzle is toward the slag flow inlet, and an air-water outlet and a filter, an air-water separation device, and a fan are arranged on the upper part of the other side wall of the granulation chamber. The high-pressure nozzle is an atomizing nozzle or a gas-liquid dual-fluid nozzle.
The partition-type high-temperature solid slag waste heat recovery system according to any one of claims 1 to 20, characterized in that the rotor granulation device comprises:

The granulation chamber has a box structure, wherein a slag flow inlet is arranged at the top of the granulation chamber, a granulated slag flow outlet is arranged at the bottom, an air inlet, an air inlet duct and a fan are arranged at the lower part of one side wall of the granulation chamber, and the granulation chamber is provided with a slag flow inlet at the top of the granulation chamber, and a slag flow outlet is arranged at the bottom of the granulation chamber. The upper part of the other side wall of the chamber is provided with an air outlet, an air outlet duct, a dust collector and a fan;

A rotating motor, wherein the rotating motor is arranged at the center of the granulating chamber;

The rotating cup is arranged at the output end of the rotating motor.
A partition-type high-temperature solid slag waste heat recovery method, characterized by comprising the following steps:

a) the slag enters a granulation device for slag granulation treatment to obtain slag particles. The air in the slag granulation process contacts the slag for heat exchange and is discharged through a dust collector and a fan. Preferably, the slag granulation treatment adopts gas quenching granulation, gas-water granulation or rotary cup granulation;

b) The slag particles enter the rolling partition heat exchanger, in which the slag particles and the water or water vapor from the steam drum are indirectly contacted and heat exchanged through the heat exchange tube group, and the water or water vapor absorbs heat to generate high-temperature water, saturated steam or superheated steam;

c) The slag particles after heat exchange are sent out through the feeder.
The partition-type high-temperature solid slag waste heat recovery method according to claim 24 is characterized in that, in step b), the slag particles and water or water vapor from the steam drum are indirectly contacted for heat exchange through the heat exchange tube group, and/or the cylinder heat exchange tube sleeve, and the core shaft heat exchange tube, and the slag particles after heat exchange fall onto the feeder under the push of the spiral plate and are discharged through the feeder.
The partition-type high-temperature solid slag waste heat recovery method according to claim 24 is characterized in that, in step b), the slag particles fall evenly under the action of the guide plate of the partition-type heat exchanger, and in the process of falling, they come into contact with the air blown out by the air distribution device provided at the lower part of the partition-type heat exchanger to exchange heat with the air.
The method for recovering waste heat from high-temperature solid slag particles of partition type according to claim 24 is characterized in that, in step b), saturated water from the steam drum enters the second heat exchange tube of the vaporization section of the partition type heat exchanger, exchanges heat with the high-temperature slag particles to become a saturated water-vapor mixture, and then flows back into the steam drum through the pipeline to achieve steam-water separation; the saturated water vapor in the steam drum flows into the first heat exchange tube of the superheating section of the partition type heat exchanger under the action of the pressure difference, exchanges heat with the slag particles to form superheated steam, and then is connected to the steam network through the pipeline via the buffer steam tank; preferably, when the slag flow rate is lower than the set value, the steam pipeline of the superheating section is closed.
The partition-type high-temperature solid slag waste heat recovery method according to claim 24 is characterized in that, before step b), the slag particles are first temporarily stored in a high-temperature storage tank and then enter the partition-type heat exchanger. During the temporary storage of the slag particles in the high-temperature storage tank, the hot air generated in the high-temperature storage tank is dedusted by a dust collector and then sent to the waste heat recovery equipment for heat exchange; preferably, a plurality of high-temperature storage tanks are arranged in parallel.