WO2019196491A1

WO2019196491A1 - Desulfurization, denitrification, and ammonia removal system

Info

Publication number: WO2019196491A1
Application number: PCT/CN2018/121553
Authority: WO
Inventors: 魏进超; 康建刚; 李小龙
Original assignee: 中冶长天国际工程有限责任公司
Priority date: 2018-04-08
Filing date: 2018-12-17
Publication date: 2019-10-17
Also published as: PH12020550679A1; RU2758368C1; KR102382875B1; CN108479344A; KR20200078618A; CN108479344B; BR112020011195A2; MY191903A

Abstract

A desulfurization, denitrification, and ammonia removal system. The system comprises an adsorption tower, a decomposition tower, a distributor, a first activated carbon conveyor, and a second activated carbon conveyor. A fume inlet is provided on one side of the adsorption tower. A fume outlet is provided at the other side of the adsorption tower. An adsorption cavity and an ammonia removal cavity are provided within the adsorption tower. The adsorption cavity is provided on the side in proximity to the fume inlet. The ammonia removal cavity is provided on the side in proximity to the fume outlet. The first activated carbon conveyor is connected to a material outlet of the absorption tower and to a material inlet of the distributor. The second activated carbon conveyor is connected to a material outlet of the decomposition tower and to a material inlet of the adsorption cavity. A material outlet of the distributor is connected respectively to a material inlet of the ammonia removal cavity and to a material inlet of the decomposition tower. The present application divides the adsorption tower into two functional areas, the adsorption reaction cavity implements the functions of desulfurization, denitrification, and dust removal, and the ammonia removal cavity is filled with fresh activated carbon or acidic activated carbon and implements the capturing of ammonia in fume that passed through an adsorption reaction layer, thus effectively preventing the escape of ammonia at the outlet.

Description

Desulfurization and denitration ammonia removal system

The present application claims priority to Chinese Patent Application No. 20110130 659 2.8, the disclosure of which is incorporated herein by reference. .

Technical field

The invention relates to an activated carbon method flue gas purification device, which belongs to an activated carbon method flue gas purification device suitable for air pollution control, in particular to a desulfurization and denitration ammonia removal system for sintering flue gas purification, and relates to the field of environmental protection.

Background technique

For industrial flue gas, especially for the sintering machine flue gas of the steel industry, it is desirable to use a desulfurization and denitration device and a process including an activated carbon adsorption tower and an analytical column. In a desulfurization and denitration device including an activated carbon adsorption tower and an analytical tower (or a regeneration tower), an activated carbon adsorption tower is used for adsorbing sulfur oxides and nitrogen from sintering flue gas or exhaust gas (especially sintering flue gas of a sintering machine of the steel industry). Contaminants such as oxides and dioxins, and analytical towers for thermal regeneration of activated carbon.

Activated carbon desulfurization has the advantages of high desulfurization rate, simultaneous denitrification, deodorization, dust removal, and no waste water residue. It is a promising method for flue gas purification. Activated carbon can be regenerated at high temperatures. At temperatures above 350 °C, pollutants such as sulfur oxides, nitrogen oxides, and dioxins adsorbed on activated carbon are rapidly resolved or decomposed (sulphur dioxide is analyzed, nitrogen oxides and dioxins). English is broken down). And as the temperature increases, the regeneration rate of the activated carbon is further accelerated, and the regeneration time is shortened. It is preferred that the activated carbon regeneration temperature in the general control analytical column is approximately equal to 430 ° C. Therefore, the ideal resolution temperature (or regeneration temperature) is, for example, at 390. -450 ° C range, more preferably in the range of 400-440 ° C.

The function of the analytical tower is to release the SO ₂ adsorbed by the activated carbon. At the same temperature and a certain residence time of 400 ° C, the dioxins can be decomposed by more than 80%, and the activated carbon is re-used after being cooled and sieved. The released SO ₂ can be made into sulfuric acid or the like, and the analyzed activated carbon is sent to the adsorption tower through a transfer device to be used for adsorbing SO ₂ and NO _X .

In the adsorption tower with the analytical column with ammonia in the NO _X occurs SCR, SNCR reactions, thereby removing the NO _X. The dust is adsorbed by the activated carbon when passing through the adsorption tower, and the vibrating screen at the bottom end of the analytical tower is separated, and the activated carbon powder under the sieve is sent to the ash silo.

At present, the activated carbon method flue gas purification process generally uses the flue gas inlet to directly inject ammonia gas. In order to increase the denitration rate, the ammonia injection amount is generally increased, but at the same time, the export ammonia escape is more serious.

In addition, the dust is adsorbed by the activated carbon when passing through the adsorption tower, and the vibrating screen at the bottom end of the analytical tower is separated, and the activated carbon powder under the sieve is sent to the ash silo, and the remaining part of the screen is regarded as qualified activated carbon for recycling. At present, the commonly used screen form is a square hole, and its side length a is determined according to the screening requirements, and is generally about 1.2 mm. However, for activated carbon of a similar size of φ9 mm × 1 mm, the use of such a sieve for sieving is also considered to be a good product. The anti-pressure strength of the tablet-shaped activated carbon is very low, and it is easy to become debris after entering the flue gas purification system. On the one hand, the flue gas purification system causes the resistance to increase due to the powder of the activated carbon bed, thereby increasing the operating cost of the system. On the other hand, it also increases the risk of high-temperature combustion of activated carbon. At the same time, the dust in the outlet flue gas is mainly composed of some fine particulate matter carried in the original flue gas and the newly entrained activated carbon charcoal powder when the flue gas passes through the activated carbon bed. It will also lead to an increase in dust from the flue gas outlet, affecting the surrounding environment and causing air pollution.

Additionally, prior art activated carbon discharge devices include a round roll feeder and a feed rotary valve, as shown in FIG.

First of all, for the round roller feeder, in its working process, the activated carbon moves downward under the control of the round roller feeder by the action of gravity. The different rotation speed of the round roller feeder determines the moving speed of the activated carbon. The activated carbon discharged from the roller feeder enters the rotary feed valve and is discharged into the conveying device. The main function of the rotary feed valve is to keep the adsorption tower sealed while discharging, so that the harmful gas in the adsorption tower is not. Leak into the air.

Since the flue gas contains a certain amount of water vapor and dust, the activated carbon will produce a small amount of sticking during the adsorption process, forming a block to block the lower feed port, as shown in FIG. If the sump is severely blocked, the activated carbon cannot move continuously, resulting in the adsorption of activated carbon being saturated and losing the purification effect. Even the activated carbon bed is caused by the high temperature of the activated carbon bed, which has a large safety hazard. The current method of processing is to manually clear the block after the system is shut down. In addition, the round roller feeder has occurred during the production process, such as: leakage during the change of the pressure of the flue gas, and uncontrollable materials during the parking. In addition, the number of round roller feeders is large (as long as one failure occurs, the entire large-scale device has to be shut down), high cost, and difficult maintenance and repair, thus bringing certain restrictions on the development of activated carbon technology.

Secondly, with the prior art feed rotary valve, there is the following problem: for the transport of fragile particles such as desulfurization and denitration activated carbon, the rotary valve is used to ensure the airtightness of the tower body on the one hand, and the material on the other hand. Non-destructive transport, but if the transport medium is sheared due to the rotation of the blades during the transfer of the rotary valve, see Figure 10, which will result in an increase in system operating costs. At the same time, the shearing phenomenon will cause the valve body to wear, the airtightness will be deteriorated, and the service life will be reduced. Especially when the feed port is full of materials, the spool is rotated, and the shearing action of the blade and the valve shell on the conveying medium is more obvious. For large adsorption towers with a height of about 20 meters, the round roller feeder or rotary valve fails during the production process, causing huge losses to the continuous operation of the process because the adsorption tower is filled with tons of activated carbon. Manual removal and repair or re-installation are quite difficult, and the impact and loss caused by downtime is unimaginable.

Summary of the invention

In order to avoid excessive escape of ammonia, the present application adopts the function of dividing the adsorption tower into two functional zones, and the adsorption reaction chamber realizes functions such as desulfurization, denitration and dust removal, and the fresh ammonia or acidic activated carbon is filled in the ammonia chamber to realize the smoke after passing through the adsorption reaction layer. The capture of ammonia in the gas effectively avoids the escape of ammonia from the outlet.

According to a first embodiment of the present invention, a desulfurization and denitration ammonia removal system is provided.

The utility model relates to a desulfurization and denitration ammonia removal system, which comprises an adsorption tower, an analytical tower, a distributor, a first activated carbon conveyor and a second activated carbon conveyor. A flue gas inlet A is provided on one side of the adsorption tower. The other side of the adsorption tower is provided with a flue gas outlet B. The adsorption tower has an adsorption chamber and an ammonia removal chamber inside. The adsorption chamber and the ammonia removal chamber are disposed in parallel in the vertical direction in the adsorption tower. The adsorption chamber is disposed near the side of the flue gas inlet A. The ammonia removal chamber is disposed near the side of the flue gas outlet B. The first activated carbon conveyor is connected to the discharge opening of the adsorption tower and the inlet of the distributor. The second activated carbon conveyor is connected to the discharge port of the analytical tower and the feed port of the adsorption chamber. The discharge ports of the distributor are respectively connected to the feed port of the ammonia removal chamber and the feed port of the analytical column.

Preferably, the flue gas inlet A is downstream of the flue. The flue downstream of the flue gas inlet A is divided into two layers. They are the upper part of the flue and the lower part of the flue. An ammonia blowing device is arranged in the upper part of the flue.

In the present invention, a porous plate is provided between the adsorption chamber and the ammonia removal chamber. The adsorption chamber and the ammonia removal chamber are separated by a porous plate.

Preferably, a vibrating screen is provided below the discharge opening of the analytical tower. The front section of the second activated carbon conveyor is connected to the discharge opening of the vibrating screen.

Preferably, the thickness of the adsorption chamber is 1-10 times, preferably 2-8 times, more preferably 3-5 times the thickness of the ammonia chamber.

Preferably, the dispenser is provided with a screen device, a large granular activated carbon outlet, and a small granular activated carbon outlet. The large granular activated carbon outlet is placed above the screen unit. The small granular activated carbon outlet is disposed below the screen device. The large granular activated carbon outlet is connected to the feed port of the ammonia removal chamber. The small granular activated carbon outlet is connected to the feed port of the analytical column. Preferably, the dispenser is provided with a screen device equipped with a screen having a rectangular mesh opening having a length L ≥ 3D and a rectangular mesh having a width a = 0.65 h - 0.95 h ( Preferably, it is from 0.7 h to 0.9 h, more preferably from 0.73 h to 0.85 h), wherein D is the diameter of the circular cross section of the activated carbon cylinder to be trapped on the screen, and h is the length of the granular activated carbon cylinder to be trapped on the screen. The minimum value.

In particular, in order to overcome the prior art problems encountered in the desulfurization and denitration apparatus, it is generally required that the minimum value h of the length of the activated carbon cylinder is 1.5 mm to 7 mm. For example h=2, 4 or 6mm.

D (or φ) depends on the specific requirements of the desulfurization and denitration device. Typically, D (or φ) = 4.5-9.5 mm, preferably 5-9 mm, more preferably 5.5-8.5 mm, more preferably 6-8 mm, such as 6.5 mm, 7 mm or 7.5 mm.

According to a second embodiment of the present invention, a desulfurization and denitration ammonia removal system is provided.

The utility model relates to a desulfurization and denitration ammonia removal system, which comprises an adsorption tower, an analytical tower, a first activated carbon conveyor, a second activated carbon conveyor and a storage silo. A flue gas inlet A is provided on one side of the adsorption tower. The other side of the adsorption tower is provided with a flue gas outlet B. The adsorption tower has an adsorption chamber and an ammonia removal chamber inside. The adsorption chamber and the ammonia removal chamber are disposed in parallel in the vertical direction in the adsorption tower. The adsorption chamber is disposed near the side of the flue gas inlet A. The ammonia removal chamber is disposed near the side of the flue gas outlet B. The first activated carbon conveyor is connected to the discharge port of the adsorption tower and the feed port of the analytical tower. The second activated carbon conveyor is connected to the discharge port of the analytical tower and the feed port of the adsorption chamber.

The system also includes an SO ₂ recovery system, a sulfur-rich gas delivery line, and an SO ₂ recovery system tail gas delivery line. One end of the sulfur-rich gas delivery pipe is connected to the analytical column. The other end of the sulfur-rich gas delivery line is connected to the gas inlet of the SO ₂ recovery system. One end of the SO ₂ recovery system off-gas delivery line is connected to the gas outlet of the SO ₂ recovery system. The other end of the exhaust pipeline SO ₂ recovery system connected to the gas inlet of the storage bins. The gas outlet of the storage bin is connected to the flue gas outlet B.

Optionally, the end of the second activated carbon conveyor is also connected to the feed port of the storage bin, and the discharge port of the storage bin is connected to the feed port of the ammonia removal chamber.

According to a third embodiment of the present invention, a desulfurization and denitration ammonia removal system is provided.

The system also includes a raw flue gas branch and a raw flue gas return conveying pipe. One end of the original flue gas branch is connected to the front section of the flue gas inlet A. The other end of the original flue gas branch is connected to the gas inlet of the storage bin. The gas outlet of the storage bin is connected to the rear section of the flue gas inlet A through the original flue gas return conveying pipe.

Preferably, the ammonia blowing means is disposed downstream of the flue gas at the location where the original flue gas branch is connected to the flue gas inlet A.

Preferably, a vibrating screen is provided below the discharge opening of the analytical tower. The front section of the second activated carbon conveyor is connected to the discharge port of the vibrating screen.

In the present invention, the first embodiment: the activated carbon after adsorbing the flue gas in the lower portion of the adsorption tower is used as the activated carbon layer in the ammonia removal chamber. The inlet flue of the adsorption tower is divided into upper and lower layers, and the upper layer is sprayed with ammonia gas to realize flue gas desulfurization and denitrification. The upper activated carbon in the adsorption tower is moved to the lower layer of the adsorption tower by gravity, the lower layer of the flue is mainly acid gas, and the activated carbon is in the adsorption tower. The lower layer absorbs acid gas such as SO _{2 to} achieve acidification, and is discharged from the adsorption tower and sent to the distributor through a conveyor. A part of the activated carbon in the distributor is used to remove the ammonia layer, and a part of the activated carbon is regenerated by the analytical tower. Preferably, the dispenser has a particle size distribution function, and the large particle activated carbon enters the ammonia removal layer, and the small particle activated carbon and the dust are analyzed.

In the present invention, a second embodiment: acidification of a raw material (i.e., fresh activated carbon/regenerated activated carbon) is carried out using an acid-making tail gas. The acid tail gas contains a certain amount of SO ₂ gas (concentration can be controlled according to requirements, generally 200mg/Nm3-600mg/Nm3), and this part of the tail gas is introduced into the fresh activated carbon tank or the regenerated activated carbon tank to realize the acidification of the activated carbon, and then the exhaust gas returns. The adsorption tower exits the flue, and the acidified activated carbon enters the ammonia removal chamber. This method simultaneously realizes the purification and resource utilization of the acid tail gas.

In the present invention, a third embodiment: acidification of a raw material (i.e., fresh activated carbon/regenerated activated carbon) is carried out using an acidic substance in the raw flue gas. The original flue gas contains a certain amount of acid gas, and some of the flue gas before the ammonia injection is introduced into the fresh activated carbon storage tank or the regenerated activated carbon storage tank to realize the acidification of the activated carbon, and then the flue gas returns to the inlet flue of the adsorption tower, and the acidified activated carbon enters the ammonia removal chamber. .

In the present invention, the adsorption chamber and the ammonia removal chamber are two chambers, and both chambers are activated carbon layers. The activated carbon in the adsorption chamber is fresh activated carbon or regenerated activated carbon; the activated carbon in the ammonia chamber is activated carbon adsorbing the original flue gas, or the activated carbon in the fresh activated carbon tank or the recycled activated carbon is treated by the tail gas of the SO ₂ recovery system.

In the present invention, the discharge opening of the adsorption tower includes a discharge port of the adsorption chamber and a discharge port of the ammonia removal chamber. The discharge opening of the adsorption chamber and the discharge opening of the ammonia removal chamber may be respectively connected to the first activated carbon conveyor. Alternatively, after the discharge opening of the adsorption chamber and the discharge opening of the ammonia removal chamber are combined, a total discharge opening is connected to the first activated carbon conveyor.

In the present invention, the downstream of the flue gas inlet A means the direction along which the flue gas flows, and the downstream direction of the flue gas inlet.

In the present invention, the thickness of the adsorption chamber and the thickness of the ammonia removal chamber are not specifically required, and are determined according to actual production processes. Generally, the thickness of the adsorption chamber is 1-10 times, preferably 2-8 times, and more preferably 3-5 times, the thickness of the ammonia chamber.

In the present invention, when the end of the second activated carbon conveyor is connected to the feed port of the storage bin, the discharge port of the storage bin is connected to the feed port of the ammonia removal chamber. When the end of the second activated carbon conveyor is only connected to the feed port of the adsorption chamber, the feed port connecting the storage bin 6 is connected to the fresh activated carbon cartridge. The discharge port of the storage bin 6 is connected to the feed port of the ammonia removal chamber 104.

In the present invention, the end of the second activated carbon conveyor is set according to the running direction of the activated carbon transportation, and the end activated carbon of the second activated carbon conveyor is at the position where the second activated carbon conveyor is transported (the position where the transportation distance is long).

In the present invention, depending on the route and direction of the flue gas flow, the position entering the flue gas inlet is the front section of the flue gas inlet (the position away from the adsorption tower), and the position close to the adsorption tower is the rear section of the flue gas inlet.

In all of the desulfurization and denitration systems of the present application, generally, a vibrating screen equipped with a screen is used below or downstream of the bottom discharge port of the analytical column.

In order to avoid the trapping of the tablet-shaped activated carbon on the screen, the present application designs a screen having a rectangular mesh or an elongated mesh. The screen can be mounted on a vibrating screen to screen out activated carbon particles that meet the needs of the desulfurization and denitration unit.

Therefore, it is preferred to provide a screen having a rectangular mesh or an elongated mesh having a length L ≥ 3D and a width of the rectangular mesh a = 0.65 h - 0.95 h (preferably 0.7 h - 0.9h, more preferably 0.73h-0.85h), where D is the diameter of the circular cross section of the activated carbon cylinder to be trapped on the screen, and h is the minimum length of the granular activated carbon cylinder to be trapped on the screen.

The adsorption column typically has at least 2 activated carbon chambers.

Preferably, there is a round roll feeder or a discharge round roll (G) at the bottom of each of the activated carbon chambers of the adsorption column. For the discharge roller (G) described herein, a prior art discharge roller can be used. However, it is preferred to use a novel star-wheel type activated carbon discharge device (G) instead of a round roller feeder or a discharge roller (G), which comprises: a front bezel at the lower portion of the activated carbon chamber And a tailgate, and a star-shaped activated carbon discharge roller located below the discharge opening formed by the front baffle and the tailgate and the two side plates at the lower portion of the activated carbon chamber; wherein the star-shaped activated carbon discharge roller comprises The circular roller and the plurality of blades are equally angularly distributed or substantially equiangularly distributed along the circumference of the circular roller. More specifically, a novel star-wheel type activated carbon discharge roller is used below the discharge opening formed by the front baffle and the tailgate and the two side plates at the lower portion of the activated carbon chamber.

From the cross section of the star-shaped activated carbon discharge roller, the star wheel configuration or shape is presented.

The star wheel type activated carbon cutting device mainly consists of a front baffle of the activated carbon discharge port, a tailgate and two side plates, and a blade and a round roll. The front baffle and the rear baffle are fixedly disposed, and an activated carbon discharge channel, that is, a discharge port, is left between the front baffle and the rear baffle, and the discharge port is composed of a front baffle, a tailgate and two side plates. The round roller is disposed at the lower end of the front baffle and the rear baffle, and the blade is uniformly fixed on the round roller, and the round roller is driven by the motor to perform the rotary motion, and the rotation direction is the direction of the front baffle of the rear baffle. The angle or spacing between the blades should not be too large, and the angle θ between the blades is generally designed to be less than 64°, for example 12-64°, preferably 15-60°, preferably 20-55°, more preferably 25-50°. More preferably, it is 30-45 degrees. A gap or spacing s is formed between the blade and the bottom end of the tailgate. The s is generally from 0.5 to 5 mm, preferably from 0.7 to 3 mm, preferably from 1 to 2 mm.

The outer circumference radius of the star wheel type activated carbon discharge roller (or the outer circumference rotation radius of the blade on the round roller) is r. r is the radius of the cross section (circle) of the round roll (106a) + the width of the blade.

In general, the radius of the cross section (circle) of the round roll is 30-120 mm, preferably 50-100 mm, and the width of the blade is 40-130 mm, preferably 60-100 mm.

The distance between the center of the round roller and the lower end of the front baffle is h, h is generally greater than r+(12-30)mm, but less than r/sin58°, which can ensure the smooth flow of activated carbon and ensure the round roller does not move. When the activated carbon does not slip off on its own.

Generally, in the present application, the discharge opening of the star-shaped activated carbon discharge device has a square or rectangular cross section, preferably a rectangular shape (or rectangular shape) having a length greater than the width. That is, a rectangle (or rectangle) whose length is greater than the width.

Preferably, the lower bin or bottom bin (H) of the adsorption column has one or more blowdown rotary valves.

For the rotary valve described herein, a prior art rotary valve can be used. However, it is preferred to use a novel rotary valve comprising: an upper feed port, a spool, a vane, a valve housing, a lower discharge port, a buffer zone in the upper space of the inner cavity of the valve, and a flat plate Wherein the buffer zone is adjacent to and communicates with the lower space of the feed port, and the length of the cross section of the buffer zone in the horizontal direction is greater than the length of the cross section of the feed port in the horizontal direction; wherein the flat plate is disposed in the buffer zone Inside, the upper end of the flat plate is fixed at the top of the buffer zone, and the cross section of the flat plate in the horizontal direction assumes a "V" shape.

Preferably, the cross section of the upper feed port is rectangular or rectangular, and the cross section of the buffer is rectangular or rectangular.

Preferably, the length of the cross section of the buffer zone is less than the length of the cross section of the blade in the horizontal direction.

Preferably, the flat plate is formed by splicing two single plates, or the flat plate is bent from one plate into two plates.

Preferably, the angle between the two veneers or the two plates is 2α ≤ 120°, preferably 2α ≤ 90°. Therefore, α ≤ 60°, preferably α ≤ 45°.

Preferably, the angle Φ ≥ 30°, preferably ≥ 45°, and more preferably Φ ≥ the friction angle of the activated carbon material, between each of the veneers or each of the plates and the length direction of the buffer zone.

Preferably, the bottom of each of the two veneers or the bottom of each of the two veneers have a circular arc shape.

Preferably, the length of the center line segment between the two sheets or between the two sheets is equal to or smaller than the width of the cross section of the buffer in the horizontal direction.

Obviously, α + Φ = 90°.

Generally, in the present application, the discharge opening of the rotary valve has a square or rectangular cross section, preferably a rectangular shape (or rectangular shape) having a length greater than the width. That is, a rectangle (or rectangle) whose length is greater than the width.

In general, the height of the main structure of the adsorption column is 10 to 60 m (meter), preferably 12 to 55 m (meter), preferably 14 to 50 m, preferably 16 to 45 m, 18 to 40 m, preferably 20 to 35 m, preferably 22 to 30 m. The height of the main structure of the adsorption tower refers to the height from the inlet to the outlet of the adsorption tower (main structure). The tower height of the adsorption tower refers to the height from the activated carbon outlet at the bottom of the adsorption tower to the activated carbon inlet at the top of the adsorption tower, that is, the height of the main structure of the tower.

Typically, the analytical column or regeneration column typically has a column height of from 8 to 45 meters, preferably from 10 to 40 meters, more preferably from 12 to 35 meters. The analytical column typically has a cross-sectional area of the body of from 6 to 100 m 2 , preferably from 8 to 50 m 2 , more preferably from 10 to 30 m 2 , further preferably from 15 to 20 m 2 .

Further, in the present application, the flue gas includes in a broad sense: conventional industrial flue gas or industrial exhaust gas.

The thickness of the activated carbon chamber or chamber refers to the distance or spacing between the two porous separators of the activated carbon chamber or chamber.

Advantages or beneficial technical effects of the present invention

1. The adsorption tower is divided into two functional zones, and the adsorption cavity realizes functions such as desulfurization, denitrification and dust removal, and the ammonia is filled with fresh activated carbon or acidic activated carbon to realize the capture of ammonia in the flue gas after passing through the adsorption reaction layer. While enhancing the effect of denitrification, it effectively prevents the escape of ammonia.

2. A porous plate is arranged between the adsorption chamber and the ammonia removal chamber, so that the activated carbon layer in the entire adsorption tower flows in the adsorption chamber and the ammonia removal chamber separately, and does not hinder the flow of the smoke.

3. The distributor has a sieve device, a large granular activated carbon outlet, and a small granular activated carbon outlet. The large granular activated carbon outlet is connected to the feed port of the ammonia chamber, and the small granular activated carbon outlet is connected to the feed port of the analytical tower. This design ensures that the particle size of the activated carbon in the ammonia chamber is removed, and the excess ammonia gas is more effectively adsorbed.

4. The sieve with rectangular mesh holes is used in the vibrating screen to eliminate the bridging phenomenon of the activated carbon of the tablet, and the tablet-shaped activated carbon with low wear resistance and low compressive strength is removed under the sieve to avoid fragmentation in the desulfurization and denitration device. And dust, reduce the movement resistance of activated carbon, reduce the risk of high temperature combustion of activated carbon in the adsorption tower, and allow high-strength activated carbon to be recycled in the device.

5, the use of special discharge device, reduce the discharge failure of activated carbon, greatly reducing the frequency of shutdown and maintenance of the entire device.

DRAWINGS

1 is a schematic structural view of a first design of a desulfurization, denitration and ammonia removal system according to the present invention;

2 is a schematic structural view of a second design of a desulfurization, denitration and ammonia removal system according to the present invention;

3 is a schematic structural view of a third design of a desulfurization, denitration and ammonia removal system according to the present invention;

4 is a schematic structural view of a fourth design of a desulfurization, denitration and ammonia removal system according to the present invention;

5 is a schematic structural view of a fifth design of a desulfurization, denitration and ammonia removal system according to the present invention;

Figure 6 is a schematic view showing the structure of a prior art screen.

Figure 7 is a schematic view showing the structure of the screen of the present application.

Figure 8 is a schematic illustration of a tablet-shaped activated carbon.

Figure 9 is a schematic illustration of a long strip of activated carbon.

10 and 11 are schematic views of a prior art activated carbon discharge device (round roll feeder).

Figure 12 is a schematic illustration of a star wheel type activated carbon discharge device of the present application.

Figure 13 is a schematic illustration of a rotary valve of the present invention.

14 and 15 are schematic structural views of a cross section taken along the line M-M of Fig. 13.

Figure 16 is a schematic view showing the structure of a flat material.

Reference mark:

1: adsorption tower; 101: upper flue; 102: lower flue; 103: adsorption chamber; 104: ammonia removal chamber; 2: analytical tower; 3: distributor; 4: first activated carbon conveyor; Activated carbon conveyor; 6: storage silo; 7: perforated plate; 8: vibrating screen; A: flue gas inlet; B: flue gas outlet; R: SO ₂ recovery system; P: ammonia gas blowing device; L1: rich Sulfur gas delivery pipeline; L2: SO ₂ recovery system exhaust gas delivery pipeline; L3: original flue gas bypass; L4: raw flue gas return to the transport pipeline.

AC-c: activated carbon chamber; H: lower hopper or bottom chamber; AC: activated carbon; AC-1: activated carbon block (or aggregate); F: rotary valve;

G: round roller feeder or star wheel type activated carbon discharge device or star wheel type activated carbon discharge roller; G01: round roller; G02: blade; AC-I: front baffle; AC-II: tailgate;

h: the distance between the axial center of the round roller G01 and the lower end of the front baffle AC-I; S: the (gap) spacing between the blade and the bottom end of the tailgate; θ: between the adjacent blades G02 on the round roller G01 Angle: r: the distance between the outer edge of the blade and the axial center of the roller G01 (ie, the radius of the blade relative to the center of the roller G01, referred to as the radius);

F: feed rotary valve; F01: spool; F02: blade; F03: valve casing; F04: upper feed port; F05: lower discharge port; F06: buffer zone in the upper space of the valve cavity; F07 : flat plate; F0701 or F0702: two plates of flat plate F07 or two plates of flat plate F07.

α: 1/2 of the angle between two veneers (F0701, F0702) or two plates (F0701, F0702).

Φ: the angle between the length direction of each single board (F0701 or F0702) or each board (F0701 or F0702) and the buffer (F06).

L1: length of the cross section of the feed port F04 in the horizontal direction; L2: length of the cross section of the flat plate F07 in the horizontal direction.

detailed description

The sintering flue gas that needs to be treated in the examples is the sintering machine flue gas from the steel industry.

A desulfurization and denitration ammonia removal system, the system comprises an adsorption tower 1, an analytical tower 2, a distributor 3, a first activated carbon conveyor 4, and a second activated carbon conveyor 5. A flue gas inlet A is provided on one side of the adsorption tower 1. The other side of the adsorption tower 1 is provided with a flue gas outlet B. The adsorption tower 103 and the ammonia removal chamber 104 are disposed inside the adsorption tower 1. The adsorption chamber 103 and the ammonia removal chamber 104 are disposed in parallel in the vertical direction inside the adsorption tower 1. The adsorption chamber 103 is disposed near the side of the flue gas inlet A. The ammonia removal chamber 104 is disposed near the side of the flue gas outlet B. The first activated carbon conveyor 4 is connected to the discharge opening of the adsorption tower 1 and the feed port of the distributor 3. The second activated carbon conveyor 5 is connected to the discharge port of the analytical column 2 and the feed port of the adsorption chamber 103. The discharge port of the distributor 3 is connected to the feed port of the ammonia removal chamber 104 and the feed port of the analytical column 2, respectively (for example via a pipe or a chute).

Preferably, the flue gas inlet A is downstream of the flue. The flue downstream of the flue gas inlet A is divided into two layers. They are the upper part 101 of the flue and the lower part 102 of the flue. The upper portion 101 of the flue is provided with an ammonia blowing device P.

In the present invention, a perforated plate 7 is provided between the adsorption chamber 103 and the ammonia removal chamber 104. The adsorption chamber 103 and the ammonia removal chamber 104 are separated by a perforated plate 7.

Preferably, the vibrating screen 8 is provided below the discharge opening of the analysis tower 2. The front section of the second activated carbon conveyor 5 is connected to the discharge port of the vibrating screen 8.

Preferably, the thickness of the adsorption chamber 103 is 1-10 times, preferably 2-8 times, more preferably 3-5 times the thickness of the ammonia chamber 104.

Preferably, the distributor 3 is provided with a screen device, a large granular activated carbon outlet, and a small granular activated carbon outlet. The large granular activated carbon outlet is placed above the screen unit. The small granular activated carbon outlet is disposed below the screen device. The large granular activated carbon outlet is connected to the feed port of the ammonia chamber 104. The small granular activated carbon outlet is connected to the feed port of the analytical column 2. Preferably, the distributor 3 is provided with a screen device equipped with a screen having a rectangular mesh opening or an elongated mesh opening (as shown in FIG. 7), the length of the rectangular mesh opening L ≥ 3D , the width of the rectangular mesh aperture a = 0.65 h - 0.95 h (preferably 0.7 h - 0.9 h, more preferably 0.73 h - 0.85 h), where D is the diameter of the circular cross section of the activated carbon cylinder to be trapped on the screen, h is the minimum length of the granular activated carbon cylinder to be trapped on the screen.

D (or φ) depends on the specific requirements of the desulfurization and denitration device. Typically, D (or φ) = 4.5 - 9.5 mm, preferably 5 - 9 mm, more preferably 5.5 - 8.5 mm, more preferably 6 - 8 mm, such as 6.5 mm, 7 mm or 7.5 mm.

A desulfurization and denitration ammonia removal system, the system adsorption tower 1, the analytical tower 2, the first activated carbon conveyor 4, the second activated carbon conveyor 5, and the storage bin 6. A flue gas inlet A is provided on one side of the adsorption tower 1. The other side of the adsorption tower 1 is provided with a flue gas outlet B. The adsorption tower 103 and the ammonia removal chamber 104 are disposed inside the adsorption tower 1. The adsorption chamber 103 and the ammonia removal chamber 104 are disposed in parallel in the vertical direction inside the adsorption tower 1. The adsorption chamber 103 is disposed near the side of the flue gas inlet A. The ammonia removal chamber 104 is disposed near the side of the flue gas outlet B. The first activated carbon conveyor 4 is connected to the discharge port of the adsorption tower 1 and the feed port of the analytical column 2. The second activated carbon conveyor 5 is connected to the discharge port of the analytical column 2 and the feed port of the adsorption chamber 103.

The system further includes a recovery system SO ₂ R, sulfur-rich gas feed line L1, SO ₂ recovery system exhaust pipeline L2. One end of the sulfur-rich gas delivery pipe L1 is connected to the analytical tower 2. The other end of the sulfur-rich gas delivery line L1 is connected to the gas inlet of the SO ₂ recovery system R. One end of the SO ₂ recovery system exhaust gas delivery line L2 is connected to the gas outlet of the SO ₂ recovery system R. The other end of the SO ₂ recovery system off-gas delivery line L2 is connected to the gas inlet of the storage bin 6. The gas outlet of the storage bin 6 is connected to the flue gas outlet B.

Optionally, the end of the second activated carbon conveyor 5 is also connected to the feed port of the storage bin 6, and the discharge port of the storage bin 6 is connected to the feed port of the ammonia removal chamber 104.

The system also includes a raw flue gas branch L3 and a raw flue gas return conveying pipe L4. One end of the original flue gas branch L3 is connected to the front section of the flue gas inlet A. The other end of the original flue gas branch L3 is connected to the gas inlet of the storage bin 6. The gas outlet of the storage bin 6 is connected to the rear section of the flue gas inlet A through the raw flue gas return conveying pipe L4.

Preferably, the ammonia blowing device P is disposed downstream of the flue gas at the connection position of the original flue gas branch L3 and the flue gas inlet A.

The present application also provides a screen having a rectangular mesh or an elongated mesh having a length L ≥ 3D and a width of the rectangular mesh a=0.65h-0.95h (preferably 0.7h-0.9h, More preferably, 0.73h - 0.85h), where D is the diameter of the circular cross section of the activated carbon cylinder to be trapped on the screen, and h is the minimum length of the granular activated carbon cylinder to be trapped on the screen.

Example A

As shown in Fig. 7, the size (screen interception size) of the finished activated carbon recycled in the desulfurization and denitration device is required to be φ9 mm (diameter, D) × 6 mm (length, h), and a sieve is designed for vibration. In the sieve of the sieve 3, the width a and the length L of the rectangular mesh are: 5 mm (width a) × 27 mm (length L). Where D is the diameter of the circular cross section of the activated carbon cylinder to be trapped on the screen, and h is the minimum length of the granular activated carbon cylinder to be trapped on the screen. a=0.833h.

Example B

As shown in Fig. 7, the size (screen interception size) of the finished activated carbon recycled in the desulfurization and denitration device is required to be φ8 mm (diameter, D) × 4 mm (length, h), and a sieve is designed for vibration. In the sieve of the sieve 3, the width a and the length L of the rectangular mesh are: 3 mm (width a) × 27 mm (length L). Where D is the diameter of the circular cross section of the granular activated carbon cylinder to be trapped on the screen. a = 0.75h. The mesh size screen is used to trap medium particle size activated carbon.

Example C

As shown in Fig. 7, the size (screen interception size) of the finished activated carbon recycled in the desulfurization and denitration device is required to be φ5 mm (diameter, D) × 2 mm (average length), and a sieve mesh is designed for the vibrating screen. In the one-layer screen of 3, the width a and the length L of the rectangular mesh are 1.6 mm (width a) × 16 mm (length L). Where D is the diameter of the circular cross section of the granular activated carbon cylinder to be trapped on the screen. a = 0.75h.

Preferably, there is a round roll feeder or a discharge round roll G at the bottom of each of the activated carbon chambers AC-c of the adsorption column. Typically, the adsorption column has at least two activated carbon chambers AC-c.

For the round roll feeder or discharge round roll G described herein, a prior art round roll feeder or discharge round roll G can be used, as shown in Figures 10 and 11. However, it is preferable to use a novel star-wheel type activated carbon discharge device G instead of the round roller feeder or the discharge roller G, as shown in FIG. The novel star-wheel type activated carbon discharge device G comprises: a front baffle AC-I and a tailgate AC-II at the lower part of the activated carbon chamber, and a front baffle AC-I and a tailgate AC located at the lower part of the activated carbon chamber. - a star-shaped activated carbon discharge roller G below the discharge opening formed by the two side plates; wherein the star-shaped activated carbon discharge roller G comprises a round roll G01 and is equiangularly distributed along the circumference of the round roll or substantially A plurality of blades G02 distributed at equal angles. More specifically, a novel star-wheel type activated carbon discharge roller G is used below the discharge opening formed by the front baffle AC-I and the tailgate AC-II and the two side plates at the lower portion of the activated carbon chamber. . That is, the discharge port formed by the bottom of each of the lower activated carbon bed portions or the front baffle AC-I and the tailgate AC-II and the two side plates at the lower portion of the activated carbon chamber Below, a star-wheel activated carbon discharge roller G is installed.

From the cross section of the star-shaped activated carbon discharge roller G, a star-wheel configuration or shape is presented.

Also. The new star wheel type activated carbon discharge device can also be referred to as a star wheel type activated carbon discharge roller G, or both can be used interchangeably.

The star wheel type activated carbon cutting device mainly consists of a front baffle AC-I of the activated carbon discharge port, a tailgate AC-II and two side plates and a blade G02 and a round roll G01. The front baffle and the tailgate are fixedly disposed, and an activated carbon feeding channel, that is, a discharge port, is left between the front baffle and the tailgate, and the discharge port is composed of a front baffle AC-I, a tailgate AC-II, and Two side panels are formed. The round roller is disposed at the lower end of the front baffle AC-I and the tailgate AC-II, and the blade G02 is uniformly fixed on the round roller G01, and the round roller G01 is driven by the motor to perform the turning motion, and the turning direction is controlled by the tailgate AC-II. Forward baffle AC-I direction. The angle or spacing between the blades G02 should not be too large, and the angle θ between the blades is generally designed to be less than 64°, for example 12-64°, preferably 15-60°, preferably 20-55°, more preferably 25-50. °, more preferably 30-45°. A gap or spacing s is formed between the blade and the bottom end of the tailgate. The s is generally from 0.5 to 5 mm, preferably from 0.7 to 3 mm, preferably from 1 to 2 mm.

The outer circumference radius of the star wheel type activated carbon discharge roller G (or the outer circumference rotation radius of the blade on the round roller) is r. r is the radius of the cross section (circle) of the circular roller G01 + the width of the blade G02.

Generally, the radius of the cross section (circle) of the round roller G01 is 30-120 mm, and the width of the blade G02 is 40-130 mm.

Preferably, the lower bin or bottom bin 107 of the adsorption column has one or more blowdown rotary valves F.

For the rotary valve F described herein, a prior art rotary valve can be used, as shown in FIG. However, it is preferred to use a new type of rotary valve F, as shown in Figures 13-16. The new rotary valve F comprises: an upper inlet F04, a spool F01, a vane F02, a valve casing F03, a lower discharge port F05, a buffer F06 located in the upper space of the inner cavity of the valve, and a flat material plate F07; The area F06 is adjacent to the lower space of the feed port F04 and is in communication with each other, and the length of the cross section of the buffer F06 in the horizontal direction is greater than the length of the cross section of the feed port F04 in the horizontal direction; wherein the flat plate is disposed in the buffer In the area F06, the upper end of the flat plate F07 is fixed at the top of the buffer F06, and the cross section of the flat plate F07 in the horizontal direction assumes a "V" shape.

Preferably, the cross section of the upper feed port F04 is rectangular or rectangular, and the cross section of the buffer F06 is rectangular or rectangular.

Preferably, the length of the cross section of the buffer zone F06 is smaller than the length of the cross section of the blade F02 in the horizontal direction.

Preferably, the flat plate F07 is formed by splicing two veneers (F0701, F0702), or the flat plate F07 is bent from one plate into two plates (F0701, F0702).

Preferably, the angle between the two veneers (F0701, F0702) or the two veneers (F0701, F0702) is 2α ≤ 120°, preferably 2α ≤ 90°. Therefore, α ≤ 60°, preferably α ≤ 45°.

Preferably, the angle Φ ≥ 30°, preferably Φ ≥ 45°, more preferably, each of the veneers (F0701 or F0702) or each of the plate faces (F0701 or F0702) and the length direction of the buffer zone F06, more preferably, Φ ≥ friction angle of activated carbon material.

Preferably, the bottom of each of the two veneers (F0701, F0702) or the bottom of each of the two plates (F0701, F0702) has a circular arc shape.

Preferably, the length of the center line segment between the two veneers (F0701, F0702) or the two plate faces (F0701, F0702) is equal to or smaller than the width of the cross section of the buffer F06 in the horizontal direction.

Obviously, α + Φ = 90°.

Generally, in the present application, the discharge port F05 of the novel rotary valve F has a square or rectangular cross section, preferably a rectangular shape (or rectangular shape) having a length greater than the width. That is, a rectangle (or rectangle) whose length is greater than the width.

Example 1

As shown in FIG. 1, a desulfurization and denitration ammonia removal system includes an adsorption tower 1, an analytical tower 2, a distributor 3, a first activated carbon conveyor 4, and a second activated carbon conveyor 5. A flue gas inlet A is provided on one side of the adsorption tower 1. The other side of the adsorption tower 1 is provided with a flue gas outlet B. The adsorption tower 103 and the ammonia removal chamber 104 are disposed inside the adsorption tower 1. The adsorption chamber 103 and the ammonia removal chamber 104 are disposed in parallel in the vertical direction inside the adsorption tower 1. The adsorption chamber 103 is disposed near the side of the flue gas inlet A. The ammonia removal chamber 104 is disposed near the side of the flue gas outlet B. The first activated carbon conveyor 4 is connected to the discharge opening of the adsorption tower 1 and the feed port of the distributor 3. The second activated carbon conveyor 5 is connected to the discharge port of the analytical column 2 and the feed port of the adsorption chamber 103. The discharge ports of the distributor 3 are connected to the feed port of the ammonia removal chamber 104 and the feed port of the analysis column 2, respectively. The thickness of the adsorption chamber 103 is three times the thickness of the ammonia chamber 104.

The adsorption column 1 has two activated carbon chambers AC-c as shown in FIG. The discharge port of each of the chambers AC-c is equipped with a round roller feeder G. The discharge port of the lower hopper or the bottom bin H is provided with a rotary valve F.

Example 2

Example 1 was repeated except that the flue gas inlet A was downstream of the flue. The flue downstream of the flue gas inlet A is divided into two layers. They are the upper part 101 of the flue and the lower part 102 of the flue. The upper portion 101 of the flue is provided with an ammonia blowing device P. A porous plate 7 is provided between the adsorption chamber 103 and the ammonia removal chamber 104. The adsorption chamber 103 and the ammonia removal chamber 104 are separated by a perforated plate 7. A vibrating screen 8 is provided below the discharge opening of the analytical tower 2. The vibrating screen 8 was equipped with the screen of Example A. The front section of the second activated carbon conveyor 5 is connected to the discharge port of the vibrating screen 8. The thickness of the adsorption chamber 103 is six times the thickness of the ammonia chamber 104.

Example 3

Example 2 was repeated except that the distributor 3 was provided with a screen device, a large granular activated carbon outlet, and a small granular activated carbon outlet. The large granular activated carbon outlet is placed above the screen unit. The small granular activated carbon outlet is disposed below the screen device. The large granular activated carbon outlet is connected to the feed port of the ammonia chamber 104. The small granular activated carbon outlet is connected to the feed port of the analytical column 2.

Example 4

As shown in FIG. 2, a desulfurization and denitration ammonia removal system includes an adsorption tower 1, an analytical tower 2, a first activated carbon conveyor 4, a second activated carbon conveyor 5, and a storage bin 6. A flue gas inlet A is provided on one side of the adsorption tower 1. The other side of the adsorption tower 1 is provided with a flue gas outlet B. The adsorption tower 103 and the ammonia removal chamber 104 are disposed inside the adsorption tower 1. The adsorption chamber 103 and the ammonia removal chamber 104 are disposed in parallel in the vertical direction inside the adsorption tower 1. The adsorption chamber 103 is disposed near the side of the flue gas inlet A. The ammonia removal chamber 104 is disposed near the side of the flue gas outlet B. The first activated carbon conveyor 4 is connected to the discharge port of the adsorption tower 1 and the feed port of the analytical column 2. The second activated carbon conveyor 5 is connected to the discharge port of the analytical column 2 and the feed port of the adsorption chamber 103. The end of the second activated carbon conveyor 5 is also connected to the feed port of the storage bin 6, and the discharge port of the storage bin 6 is connected to the feed port of the ammonia removal chamber 104.

Preferably, a vibrating screen 8 is provided below the discharge opening of the analytical tower 2. The vibrating screen 8 was equipped with the screen of Example A.

Example 5

As shown in FIG. 3, a desulfurization and denitration ammonia removal system includes an adsorption tower 1, an analytical tower 2, a first activated carbon conveyor 4, a second activated carbon conveyor 5, and a storage bin 6. A flue gas inlet A is provided on one side of the adsorption tower 1. The other side of the adsorption tower 1 is provided with a flue gas outlet B. The adsorption tower 103 and the ammonia removal chamber 104 are disposed inside the adsorption tower 1. The adsorption chamber 103 and the ammonia removal chamber 104 are disposed in parallel in the vertical direction inside the adsorption tower 1. The adsorption chamber 103 is disposed near the side of the flue gas inlet A. The ammonia removal chamber 104 is disposed near the side of the flue gas outlet B. The first activated carbon conveyor 4 is connected to the discharge port of the adsorption tower 1 and the feed port of the analytical column 2. The second activated carbon conveyor 5 is connected to the discharge port of the analytical column 2 and the feed port of the adsorption chamber 103. The feed port connecting the storage bins 6 is connected to a fresh activated carbon cartridge. The discharge port of the storage bin 6 is connected to the feed port of the ammonia removal chamber 104.

The system also includes an SO ₂ recovery system R, a sulfur-rich gas delivery conduit L1, and a SO ₂ recovery system exhaust gas delivery conduit L2. One end of the sulfur-rich gas delivery pipe L1 is connected to the analytical tower 2. The other end of the sulfur-rich gas delivery line L1 is connected to the gas inlet of the SO ₂ recovery system R. One end of the SO ₂ recovery system exhaust gas delivery line L2 is connected to the gas outlet of the SO ₂ recovery system R. The other end of the SO ₂ recovery system off-gas delivery line L2 is connected to the gas inlet of the storage bin 6. The gas outlet of the storage bin 6 is connected to the flue gas outlet B.

Example 6

As shown in FIG. 4, a desulfurization and denitration ammonia removal system includes an adsorption tower 1, an analytical tower 2, a first activated carbon conveyor 4, a second activated carbon conveyor 5, and a storage bin 6. A flue gas inlet A is provided on one side of the adsorption tower 1. The other side of the adsorption tower 1 is provided with a flue gas outlet B. The adsorption tower 103 and the ammonia removal chamber 104 are disposed inside the adsorption tower 1. The adsorption chamber 103 and the ammonia removal chamber 104 are disposed in parallel in the vertical direction inside the adsorption tower 1. The adsorption chamber 103 is disposed near the side of the flue gas inlet A. The ammonia removal chamber 104 is disposed near the side of the flue gas outlet B. The first activated carbon conveyor 4 is connected to the discharge port of the adsorption tower 1 and the feed port of the analytical column 2. The second activated carbon conveyor 5 is connected to the discharge port of the analytical column 2 and the feed port of the adsorption chamber 103. The end of the second activated carbon conveyor 5 is also connected to the feed port of the storage bin 6, and the discharge port of the storage bin 6 is connected to the feed port of the ammonia removal chamber 104.

Example 7

As shown in FIG. 5, a desulfurization and denitration ammonia removal system includes an adsorption tower 1, an analytical tower 2, a first activated carbon conveyor 4, a second activated carbon conveyor 5, and a storage bin 6. A flue gas inlet A is provided on one side of the adsorption tower 1. The other side of the adsorption tower 1 is provided with a flue gas outlet B. The adsorption tower 103 and the ammonia removal chamber 104 are disposed inside the adsorption tower 1. The adsorption chamber 103 and the ammonia removal chamber 104 are disposed in parallel in the vertical direction inside the adsorption tower 1. The adsorption chamber 103 is disposed near the side of the flue gas inlet A. The ammonia removal chamber 104 is disposed near the side of the flue gas outlet B. The first activated carbon conveyor 4 is connected to the discharge port of the adsorption tower 1 and the feed port of the analytical column 2. The second activated carbon conveyor 5 is connected to the discharge port of the analytical column 2 and the feed port of the adsorption chamber 103. The feed port connecting the storage bins 6 is connected to a fresh activated carbon cartridge. The discharge port of the storage bin 6 is connected to the feed port of the ammonia removal chamber 104.

Example 8

Example 7 was repeated except that the flue gas inlet A was downstream of the flue. The flue downstream of the flue gas inlet A is divided into two layers. They are the upper part 101 of the flue and the lower part 102 of the flue. The upper portion 101 of the flue is provided with an ammonia blowing device P. The ammonia blowing device P is disposed downstream of the flue gas at the position where the original flue gas branch L3 is connected to the flue gas inlet A (as shown on the left side in Fig. 5).

In the above embodiment, by using a vibrating screen equipped with a specific screen instead of the ordinary vibrating screen below the discharge port of the analytical tower 2, bridging of the activated carbon of the tablet is eliminated, and the wear resistance is removed under the screen. The tablet-shaped activated carbon is very low, avoiding the generation of debris and dust in the desulfurization and denitration device, reducing the movement resistance of the activated carbon, reducing the risk of high-temperature combustion of the activated carbon in the adsorption tower, allowing the high-strength activated carbon to be recycled in the device and reducing the vibrating screen. Screening and reducing operating costs.

Example 9

Example 1 was repeated except that instead of the discharge roller G, a novel star-wheel type activated carbon discharge device was used, as shown in FIG. A discharge port is provided at the bottom of an activated carbon chamber. The discharge opening is composed of a front baffle AC-I and a tailgate AC-II and two side plates (not shown).

The height of the main structure of the adsorption tower is 21 m (meter). The adsorption tower 1 has two activated carbon chambers. The thickness of the first chamber on the left side is 180 mm. The thickness of the second chamber on the right is 900 mm.

The star wheel type activated carbon discharge device comprises: a front baffle AC-I and a tailgate AC-II at the lower part of the activated carbon chamber, and a front baffle AC-I and a tailgate AC-II located at the lower part of the activated carbon chamber. a star-shaped activated carbon discharge roller G below the discharge opening formed by the two side plates; wherein the star-shaped activated carbon discharge roller G comprises a round roll G01 and an equi-angle (θ=30°) distribution along the circumference of the round roll 12 blades G02.

From the cross section of the star-shaped activated carbon discharge roller G, a star-wheel configuration is presented.

The discharge opening is composed of a front baffle AC-I, a tailgate AC-II and two side plates. The round roller is disposed at the lower end of the front baffle AC-I and the tailgate AC-II, and the blade G02 is uniformly fixed on the round roller G01, and the round roller G01 is driven by the motor to perform the turning motion, and the turning direction is controlled by the tailgate AC-II. Forward baffle AC-I direction. The angle θ between the blades G02 is 30°. A gap or spacing s is formed between the blade and the bottom end of the tailgate. The s takes 2mm.

The radius of the cross section (circle) of the round roller G01 is 60 mm, and the width of the blade G02 is 100 mm.

Example 10

Example 2 was repeated except that instead of the discharge roller G, a novel star wheel type activated carbon discharge device was used, as shown in FIG. A discharge port is provided at the bottom of an activated carbon chamber. The discharge opening is composed of a front baffle AC-I and a tailgate AC-II and two side plates (not shown).

The height of the main structure of the adsorption tower is 21 m (meter). The adsorption tower 1 has two activated carbon chambers. The thickness of the first chamber on the left is 160 mm. The thickness of the second chamber on the right is 1000 mm.

The star wheel type activated carbon discharge device comprises: a front baffle AC-I and a tailgate AC-II at the lower part of the activated carbon chamber, and a front baffle AC-I and a tailgate AC-II located at the lower part of the activated carbon chamber. a star-shaped activated carbon discharge roller G below the discharge opening formed by the two side plates; wherein the star-shaped activated carbon discharge roller G comprises a round roller G01 and an equi-angle (θ=45°) distribution along the circumference of the circular roller 8 blades G02.

The discharge opening is composed of a front baffle AC-I, a tailgate AC-II and two side plates. The round roller is disposed at the lower end of the front baffle AC-I and the tailgate AC-II, and the blade G02 is uniformly fixed on the round roller G01, and the round roller G01 is driven by the motor to perform the turning motion, and the turning direction is controlled by the tailgate AC-II. Forward baffle AC-I direction. The angle θ between the blades G02 is 45°. A gap or spacing s is formed between the blade and the bottom end of the tailgate. The s takes 1mm.

The outer circumference radius of the star wheel type activated carbon discharge roller G is r. r is the radius of the cross section (circle) of the circular roller G01 + the width of the blade G02.

The radius of the cross section (circle) of the round roller G01 is 90 mm, and the width of the blade G02 is 70 mm.

Example 11

Example 2 was repeated except that instead of the conventional blowdown rotary valve F, a new blowdown rotary valve F was used, as shown in Figs. 13-16.

The new rotary valve F includes an upper feed port F04, a spool F01, a vane F02, a valve casing F03, a lower discharge port F05, a buffer F06 located in the upper space of the inner chamber of the valve, and a flat material plate F07. Wherein the buffer zone F06 is adjacent to the lower space of the feed port F04 and is in communication with each other, and the length of the cross section of the buffer zone F06 in the horizontal direction is greater than the length of the cross section of the feed port F04 in the horizontal direction; wherein the flat plate is set In the buffer zone F06, the upper end of the flat plate F07 is fixed at the top of the buffer F06, and the cross section of the flat plate F07 in the horizontal direction assumes a "V" shape.

The cross section of the upper feed port F04 is rectangular, and the cross section of the buffer F06 is also rectangular.

The length of the cross section of the buffer F06 is smaller than the length of the cross section of the blade F02 in the horizontal direction.

The flat plate F07 is made up of two veneers (F0701, F0702).

The angle 2α of the two veneers (F0701, F0702) is 90°.

Preferably, the angle Φ between each of the veneers (F0701 or F0702) or each of the plates (F0701 or F0702) and the length direction of the buffer F06 is 30°. Make sure that Φ is greater than the friction angle of the activated carbon material.

The bottoms of each of the two veneers (F0701, F0702) are rounded.

The length of the center line segment between the two veneers (F0701, F0702) or the two plate faces (F0701, F0702) is slightly smaller than the width of the cross section of the buffer F06 in the horizontal direction.

α + Φ = 90°.

The outer peripheral radius of rotation of the blades of the rotary valve is r. r is the radius of the cross section (circle) of the spool F01 + the width of the blade F02.

The radius of the cross section (circle) of the spool F01 is 30 mm, and the width of the blade F02 is 100 mm. That is, r is 130 mm.

The length of the blade F02 is 380 mm.

Example 12

Example 10 was repeated except that instead of the conventional blowdown rotary valve F, a new blowdown rotary valve F was used, as shown in Figs. 13-16.

The rotary valve F includes: an upper inlet F04, a spool F01, a vane F02, a valve casing F03, a lower discharge port F05, a buffer F06 located in an upper space of the inner chamber of the valve, and a flat material plate F07. Wherein the buffer zone F06 is adjacent to the lower space of the feed port F04 and is in communication with each other, and the length of the cross section of the buffer zone F06 in the horizontal direction is greater than the length of the cross section of the feed port F04 in the horizontal direction; wherein the flat plate is set In the buffer zone F06, the upper end of the flat plate F07 is fixed at the top of the buffer F06, and the cross section of the flat plate F07 in the horizontal direction assumes a "V" shape.

The flat plate F07 is made up of two veneers (F0701, F0702).

The angle 2α of the two veneers (F0701, F0702) is 90°.

The bottoms of each of the two veneers (F0701, F0702) are rounded.

α + Φ = 90°.

The length of the blade F02 is 380 mm.

Claims

A desulfurization and denitration ammonia removal system, the system comprises an adsorption tower (1), an analytical tower (2), a distributor (3), a first activated carbon conveyor (4), a second activated carbon conveyor (5), and an adsorption tower ( 1) is provided with a flue gas inlet (A) on one side, a flue gas outlet (B) on the other side of the adsorption tower (1), and an adsorption chamber (103) and an ammonia removal chamber inside the adsorption tower (1) ( 104), the adsorption chamber (103) and the ammonia removal chamber (104) are arranged in parallel in the vertical direction in the adsorption tower (1), and the adsorption chamber (103) is disposed on the side close to the inlet (A) of the flue gas, and the ammonia chamber is removed. (104) disposed on the side close to the flue gas outlet (B); the first activated carbon conveyor (4) is connected to the discharge port of the adsorption tower (1) and the feed port of the distributor (3), and the second activated carbon conveyor ( 5) Connect the discharge port of the analytical tower (2) and the feed port of the adsorption chamber (103), and the discharge ports of the distributor (3) are respectively connected to the feed port and the analytical tower of the ammonia removal chamber (104) (2) The feed port.
A desulfurization and denitration ammonia removal system, the system comprises an adsorption tower (1), an analytical tower (2), a first activated carbon conveyor (4), a second activated carbon conveyor (5), a storage silo (6); an adsorption tower (1) is provided with a flue gas inlet (A) on one side, a flue gas outlet (B) on the other side of the adsorption tower (1), and an adsorption chamber (103) and an ammonia removal chamber inside the adsorption tower (1). (104), the adsorption chamber (103) and the ammonia removal chamber (104) are disposed in parallel in the vertical direction in the adsorption tower (1), and the adsorption chamber (103) is disposed near the side of the flue gas inlet (A) to remove ammonia. The chamber (104) is disposed near the flue gas outlet (B); the first activated carbon conveyor (4) is connected to the discharge port of the adsorption tower (1) and the feed port of the analytical tower (2), and the second activated carbon conveyor (5) connecting the discharge port of the analytical tower (2) and the feed port of the adsorption chamber (103), optionally, the end of the second activated carbon conveyor (5) is also connected to the feed port of the storage bin (6) The discharge port of the storage bin (6) is connected to the feed port of the ammonia removal chamber (104);

The system also includes an SO 2 recovery system (R), a sulfur-rich gas delivery pipeline (L1), an SO 2 recovery system tail gas delivery pipeline (L2), and one end of the sulfur-rich gas delivery pipeline (L1) is connected to the analytical tower (2). The other end of the sulfur gas delivery pipe (L1) is connected to the gas inlet of the SO 2 recovery system (R), and one end of the SO 2 recovery system exhaust gas delivery pipe (L2) is connected to the gas outlet of the SO 2 recovery system (R), and the SO 2 recovery system The other end of the exhaust gas delivery pipe (L2) is connected to the gas inlet of the storage bin (6), and the gas outlet of the storage bin (6) is connected to the flue gas outlet (B).
A desulfurization and denitration ammonia removal system, the system comprises an adsorption tower (1), an analytical tower (2), a first activated carbon conveyor (4), a second activated carbon conveyor (5), a storage silo (6); an adsorption tower (1) is provided with a flue gas inlet (A) on one side, a flue gas outlet (B) on the other side of the adsorption tower (1), and an adsorption chamber (103) and an ammonia removal chamber inside the adsorption tower (1). (104), the adsorption chamber (103) and the ammonia removal chamber (104) are disposed in parallel in the vertical direction in the adsorption tower (1), and the adsorption chamber (103) is disposed near the side of the flue gas inlet (A) to remove ammonia. The chamber (104) is disposed near the flue gas outlet (B); the first activated carbon conveyor (4) is connected to the discharge port of the adsorption tower (1) and the feed port of the analytical tower (2), and the second activated carbon conveyor (5) connecting the discharge port of the analytical tower (2) and the feed port of the adsorption chamber (103), optionally, the end of the second activated carbon conveyor (5) is also connected to the feed port of the storage bin (6) The discharge port of the storage bin (6) is connected to the feed port of the ammonia removal chamber (104);

The system also includes a raw flue gas branch (L3), a raw flue gas return conveying pipe (L4), one end of the original flue gas branch (L3) is connected to the front section of the flue gas inlet (A), and the original flue gas branch (L3) The other end is connected to the gas inlet of the storage bin (6), and the gas outlet of the storage bin (6) is connected to the rear section of the flue gas inlet (A) through the original flue gas return conveying pipe (L4).
The system according to claim 1 or 2, characterized in that the flue gas inlet (A) is downstream of the flue, and the flue downstream of the flue gas inlet (A) is divided into two layers, respectively an upper flue (101), The lower part of the flue (102) and the upper part (101) of the flue are provided with an ammonia blowing device (P).
The system according to claim 3, characterized in that the flue gas inlet (A) is downstream of the flue, and the flue downstream of the flue gas inlet (A) is divided into two layers, namely the upper flue (101) and the flue. The lower portion (102), the upper portion (101) of the flue is provided with an ammonia blowing device (P); preferably, the ammonia blowing device (P) is disposed at the original flue gas branch (L3) and the flue gas inlet (A) Connected to the downstream of the flue gas.
The system according to any one of claims 1 to 5, characterized in that a porous plate (7), an adsorption chamber (103) and an ammonia removal chamber are provided between the adsorption chamber (103) and the ammonia removal chamber (104). 104) separated by a perforated plate (7).
The system according to any one of claims 1 to 6, characterized in that a vibrating screen (8) is arranged below the discharge opening of the analytical tower (2), and the front section of the second activated carbon conveyor (5) is connected to the vibrating screen (8) The discharge port.
A system according to any one of claims 1-7, characterized in that the thickness of the adsorption chamber (103) is 1-10 times the thickness of the ammonia chamber (104).
The system according to claim 1, characterized in that: the distributor (3) is provided with a screen device, a large granular activated carbon outlet, a small granular activated carbon outlet, and a large granular activated carbon outlet is arranged above the screen device, small The granular activated carbon outlet is arranged below the screen device, the large granular activated carbon outlet is connected to the feed port of the ammonia removal chamber (104), and the small granular activated carbon outlet is connected to the feed port of the analytical tower (2);

The screen device is equipped with a screen having a rectangular mesh having a length L ≥ 3D and a width of the rectangular mesh a=0.65h-0.95h, wherein D is a circle of the activated carbon cylinder to be trapped on the screen. The diameter of the cross-section, h is the minimum length of the granular activated carbon cylinder to be trapped on the screen.
The system according to claim 2 or 3, characterized in that a vibrating screen equipped with a screen having a rectangular mesh opening is used below or downstream of the bottom discharge opening of the analytical column (2), the rectangular mesh The length L≥3D, the width of the rectangular mesh hole a=0.65h-0.95h, where D is the diameter of the circular cross section of the activated carbon cylinder to be trapped on the screen, h is the granular activated carbon cylinder to be trapped on the screen The minimum length of the body.
A system according to any one of claims 1 to 10, wherein the adsorption column (1) has at least 2 activated carbon chambers (AC-c) and is at the bottom of each of the activated carbon chambers (AC-c) or A star wheel type activated carbon discharge roller (G) is arranged below the discharge opening formed by the front baffle (AC-I) and the rear baffle (AC-II) and the two side plates at the lower part of the activated carbon chamber. The star wheel type activated carbon discharge roller (G) includes a round roll (G01) and a plurality of blades (G02) angularly distributed along the circumference of the round roll.
The system according to claim 11, wherein the round roller (G01) is disposed at a lower end of the front baffle (AC-I) and the tailgate (AC-II), and the blades are distributed on the circumference of the round roller (G01) ( The angle θ between G02) is 12-64°.
The system according to claim 12, wherein a spacing s between the blade (G02) and the bottom end of the tailgate is 0.5-5 mm; and/or

The radius of the cross section of the round roll (G01) is 30-120 mm, and the width of the blade (G02) is 40-130 mm; and/or

The distance h between the center of the round roll and the lower end of the front baffle is greater than r + (12-30) mm, but less than r / sin 58 °.
A system according to any one of claims 1 to 13, wherein the lower or bottom bin (H) of the adsorption column has one or more blowdown rotary valves (F), the rotary valve (F) comprising : Upper feed port (F04), spool (F01), vane (F02), valve housing (F03), lower discharge port (F05), buffer in the upper space of the valve chamber (F06), peace a material plate (F07); wherein the buffer zone (F06) is adjacent to the lower space of the feed port (F04) and communicates with each other, and the length of the cross section of the buffer zone (F06) in the horizontal direction is greater than the feed port (F04) The length of the cross section in the horizontal direction; wherein the flat plate is placed in the buffer zone (F06), the upper end of the flat plate (F07) is fixed at the top of the buffer zone (F06), and the flat plate (F07) is horizontally The cross section presents a "V" shape.
The system according to claim 14, wherein the upper feed port (F04) has a rectangular or rectangular cross section, and the buffer (F06) has a rectangular or rectangular cross section; and/or

The length of the cross section of the buffer zone (F06) is smaller than the length of the cross section of the blade (F02) in the horizontal direction.
The system according to claim 14 or 15, wherein the flat plate (F07) is formed by splicing two veneers (F0701, F0702), or the flat plate (F07) is bent from two plates into two The plate surface (F0701, F0702), the two veneers (F0701, F0702) or the two plate faces (F0701, F0702) have an angle of 2α ≤ 120°, that is, α ≤ 60°.
A system according to any one of claims 14-16, wherein the angle between the length direction of each of the veneers (F0701 or F0702) or each of the plates (F0701 or F0702) and the buffer zone (F06) Φ≥30°; and/or

The bottom of each of the two veneers (F0701, F0702) or the bottom of each of the two panels (F0701, F0702) has a circular arc shape.