CN212669567U - Powder lime calcining and reforming system based on novel dry-process cement clinker calcining system - Google Patents
Powder lime calcining and reforming system based on novel dry-process cement clinker calcining system Download PDFInfo
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Abstract
The utility model discloses a powder lime calcines transformation system based on novel dry process cement clinker system of calcining, including the preheater dore furnace among the novel dry process cement clinker system of calcining to the preheater dore furnace still includes second grade suspension calcination system, suspension cooling system as the one-level suspension system of calcining, and wherein the second grade suspension system of calcining comprises suspension calcining furnace, cyclone, and suspension cooling system includes multistage series connection suspension cooler, and multistage series connection suspension cooler comprises multistage suspension cooler whirlwind section of thick bamboo in series connection. The utility model discloses utilize current part equipment and the facility of novel dry process cement manufacture line, reform transform the grog system of firing into the calcined powder lime product, the technology is advanced, green energy-conserving, and degree of automation is high, can realize intelligent operation. Meanwhile, idle equipment can be effectively utilized, a new product field is developed, and enterprise benefits are increased.
Description
Technical Field
The utility model relates to a new-type dry process cement clinker burns till the system field, specifically is a whitewashed lime burns and reforms transform system based on novel dry process cement clinker burns till system.
Background
The active lime is an indispensable important industrial raw material for various industrial departments, is widely used in industries such as calcium carbide, electric power, glass fiber, building materials, papermaking, sewage treatment and the like, and the annual consumption is nearly 3 hundred million tons. The powdered lime is mainly used in the industries of electric desulfurization, glass fiber, building materials, papermaking, sewage treatment and the like, and the market of the powdered lime can be replaced by the powdered lime, and the annual total consumption of the powdered lime is nearly 1.5 hundred million tons.
At present, lime is mainly obtained by calcining massive limestone, production enterprises are small and scattered, and the technology is laggard and the environment is poor. The common limestone calcining device mainly comprises a mechanical shaft kiln, a beam type shaft kiln, a sleeve shaft kiln, a double-hearth shaft kiln and a vertical preheater rotary kiln, and the device has the advantages of low heat exchange efficiency, high calcining heat consumption, difficult guarantee of product quality and uniformity, and the phenomena of surface overburning and internal underfiring and the like in different degrees due to the calcining of massive limestone.
At present, the powdery lime is obtained by selecting, crushing and grinding blocky lime, but the blocky lime is far poorer in grindability than limestone and high in grinding power consumption. With the increasing demand of the powdered lime, the powdered lime calcination process which is green, energy-saving and environment-friendly is more suitable.
The limestone calcination reaction is decomposition of calcium carbonate CaCO3 → CaO + CO2, which is an endothermic reaction, CaCO3 starts to decompose endothermically into CaO and CO2 gas is released when the temperature rises to 550 ℃, the decomposition rate increases with the rise in temperature, and a large amount of decomposition starts at 750 ℃ or higher, and the endothermic amount is 1660kj/kg (397 kcal/kg). The decomposition reaction speed of calcium carbonate is mainly related to factors such as the temperature of a calcining furnace, the partial pressure of CO2, the particle size of calcium carbonate and the like. The limestone particle size is the most important factor influencing the decomposition reaction speed of the calcium carbonate, and the larger the limestone particle is, the deeper the limestone particle is, the slower the permeation of heat and the overflow of CO2 generated by decomposition are, and the slower the decomposition reaction of the calcium carbonate is.
The method for changing limestone from block to powder calcination is the most effective method for improving the decomposition reaction speed of calcium carbonate, namely, the suspension preheating decomposition technology is utilized to complete the preheating and decomposition process of limestone powder in a suspension state. Experiments show that under laboratory conditions, limestone with a particle size of 0.1mm has a complete decomposition time of less than 2 seconds at 950 ℃.
And the suspension preheating decomposition technology is widely applied in China, especially in the cement industry, a clinker firing system of a novel dry cement production line in China is shown as figure 1, and mainly comprises a preheater decomposing furnace 5, a kiln tail smoke chamber 6, a rotary kiln 7, a kiln head burner 9, a grate cooler 8, a waste heat recovery device 4 and a high-temperature fan 3, wherein the preheater decomposing furnace 5 comprises five-stage preheater cyclone cylinders 5-1, 5-2, 5-3, 5-4 and 5-5, a decomposing furnace 5-6 and a gooseneck pipe 5-7, raw powder A taking limestone powder as a main ingredient enters the decomposing furnace 5-6 after being sequentially preheated step by step through four-stage preheater cyclone cylinders 5-1, 5-2, 5-3 and 5-4, is calcined and decomposed in the decomposing furnace 5-6, then enters the fifth-stage preheater cyclone cylinder 5-5 through the gooseneck pipe 5-7 for separation and collection, and then the high-temperature waste gas discharged from the waste gas outlet end of the first-stage preheater cyclone 5-1 is subjected to partial heat recovery by a waste heat recovery device 4, and then is sent to at least one of an external waste gas dedusting system and a raw material grinding system through a dedusting system waste gas pipeline 1 and a raw material grinding system waste gas pipeline 2 by a high-temperature fan 3. A core preheater decomposing furnace of a clinker firing system of a novel dry-method cement production line is a preheating calcining system mainly based on calcium carbonate decomposition reaction, the proportion of limestone in raw meal powder subjected to preheating calcining is about 80-85%, the content of calcium oxide is 43-45%, and the decomposition rate of raw meal powder calcium carbonate discharged from a furnace and fed into the kiln generally reaches 90-95%.
Because the development of the domestic novel dry-process cement industry is rapid, the excess capacity condition of the cement market is gradually intensified in recent years, the state sets industrial policies such as 'total control, structure adjustment, big-to-small change' and the like for the cement industry, and a plurality of novel dry-process cement production lines with small scale and poor benefit are shut down and are left unused. It is possible and necessary to modify the core preheater decomposing furnace of the calcining system to calcine the powdered lime product, meanwhile, the limestone and the fuel can be crushed and stored by using the existing equipment and facilities, the limestone powder can be prepared by using the existing raw material preparation system, the existing raw material homogenization system can be used for storing and metering the feed, and the fuel powder can also be ground and metered by using the existing fuel preparation system, so that a new product field and a live stock asset of a plate are developed for enterprises.
Calcine the raw materials by the raw materials powder of limestone ratio about 80~85% in the transformation, become single limestone powder and used limestone calcium oxide content higher, the calcium oxide content improves 52~55% or higher by 43~45% in the raw materials of calcining promptly, the main technical problem that need solve has, firstly how improve calcium carbonate decomposition rate to 97~99% in order to obtain purer powder lime, secondly how will calcine the high temperature powder lime product that obtains and cool off, the utility model discloses aim at providing a technical scheme for this.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a lime powder calcining and reforming system based on a novel dry cement clinker calcining system, which uses the prior preheater decomposing furnace as a primary suspension calcining system to preheat and decompose the fed limestone powder to obtain a lime powder primary product; a secondary suspension calcining system is added to further decompose the powdered lime primary product obtained by the primary suspension calcining system; and adding a suspension cooling system to cool the powdered lime finished product of the secondary suspension calciner.
In order to achieve the above purpose, the utility model discloses the technical scheme who adopts is:
powder lime calcination transformation system based on novel dry process cement clinker system of firing burns, including the preheater dore furnace in the novel dry process cement clinker system of firing, the preheater dore furnace includes multistage preheater whirlwind section of thick bamboo, dore furnace, its characterized in that: regard as one-level suspension system of calcining with preheater dore furnace, still include second grade suspension system of calcining, suspension cooling system, wherein:
in the first-stage suspension calcining system, limestone powder as a raw material is sequentially preheated by the cyclone cylinders of all stages of preheaters except the last stage and then enters a decomposing furnace, the limestone powder is calcined in the decomposing furnace to obtain a primary product of powdered lime, the primary product of powdered lime enters the cyclone cylinders of the last stage of preheaters for separation and collection,
the secondary suspension calcining system comprises a suspension calcining furnace and a cyclone separator, wherein the discharge end of a cyclone cylinder of a last stage preheater in the primary suspension calcining system is connected with the feed end of the suspension calcining furnace, the discharge end of the suspension calcining furnace is connected with the feed end of the cyclone separator, the collected primary powdered lime product is sent into the suspension calcining furnace by the cyclone cylinder of the last stage preheater in the primary suspension calcining system for further calcining to obtain finished powdered lime, and the finished powdered lime is sent into the cyclone separator for separation and collection by the suspension calcining furnace;
the suspension cooling system comprises multistage series suspension coolers, the multistage series suspension coolers are formed by connecting multistage suspension cooler cyclone cylinders in series, wherein the feed end of a first stage suspension cooler cyclone cylinder is connected with the discharge end of a cyclone separator in the second stage suspension calcining system, the discharge end of an adjacent previous stage suspension cooler cyclone cylinder is connected with the feed end of a next stage suspension cooler cyclone cylinder, the finished product powder lime in the cyclone separator is subjected to heat exchange cooling in sequence through the multistage suspension cooler cyclone cylinders, the finished product powder lime is finally collected by the last stage suspension cooler cyclone cylinder, and the finished product powder lime is discharged from the discharge end of the last stage suspension cooler cyclone cylinder.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: in the primary suspension calcining system, an original kiln tail smoke chamber of the decomposing furnace is replaced by an air inlet chamber; and the waste gas outlet end of the cyclone separator in the secondary suspension calcining system is communicated with the air inlet of the air inlet chamber of the decomposing furnace, and the waste gas discharged by the cyclone separator enters the air inlet chamber of the decomposing furnace to be used as combustion air and suspension medium flue gas of the decomposing furnace.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: still include the waste heat recovery device among the novel dry process cement clinker system of firing into, the high temperature fan, the waste gas outlet end and the inlet connection of waste heat recovery device of first order preheater whirlwind section of thick bamboo in the system are calcined in the one-level suspension, the outlet end of waste heat recovery device and the inlet connection of high temperature fan, the outlet end and the dust pelletizing system exhaust gas pipeline of high temperature fan, at least one of the two of raw materials grinding system exhaust gas pipeline is connected, after the high temperature waste gas of first order preheater whirlwind section of thick bamboo discharge was retrieved partial heat by waste heat recovery device, send outside waste gas dust pelletizing system to through the high temperature fan again, at least one of the two.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: the suspension calciner in the secondary suspension calcining system is provided with an auxiliary combustion ignition chamber, and combustion air and combustion fuel are introduced into the suspension calciner from the auxiliary combustion ignition chamber so as to ignite and improve the combustion air temperature of the suspension calciner;
the suspension cooling system also comprises a cooler exhaust fan, the hot air outlet end of the first stage suspension cooler cyclone cylinder in the suspension cooling system is connected with the inlet end of the cooler exhaust fan, the outlet end of the cooler exhaust fan is connected with the inlet end of the auxiliary combustion ignition chamber, and most of hot air exhausted by the first stage suspension cooler cyclone cylinder is sent into the auxiliary combustion ignition chamber through the cooler exhaust fan to support combustion of the suspension calciner.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: the outlet end of the exhaust fan of the cooler is also connected with a waste gas pipeline of the dust removal system through an air release valve, and the rest of hot air exhausted by the cyclone cylinder of the first-stage suspension cooler is sent to the waste gas pipeline of the dust removal system through the exhaust fan of the cooler and the air release valve.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: the fuel used by the decomposing furnace and the suspension calcining furnace is one or a mixture of more of coal, natural gas, fuel oil and petroleum coke in any proportion.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: and the outlet temperature of the decomposing furnace of the primary suspension calcining system is controlled to be 850-930 ℃.
The lime powder calcining and reforming system based on the novel dry-process cement clinker calcining system is characterized in that: and the temperature of the outlet of the suspension calciner of the secondary suspension calcining system is controlled to be 900-980 ℃.
The utility model discloses the advantage does:
the modified powdered lime secondary suspension calcining cooling system organically integrates the processes of limestone powder preheating, decomposition, secondary re-decomposition and powdered lime cooling, and the whole process is completed in a suspension state. Therefore, the heat efficiency is high, and the energy consumption of the system is low; the reaction speed is high, the temperature distribution is uniform and controllable, the product quality is stable, and the content of active calcium oxide in the finished product of powdered lime can be effectively controlled;
the existing environmental protection facilities of the novel dry-method cement production line are complete and high in mechanical automation degree, and the improved powder lime secondary suspension calcining cooling system is favorable for realizing green energy conservation and intelligent operation.
The novel dry-method cement production line accumulates abundant experience in the aspects of operation, management, operation and the like of the existing suspension preheating decomposition system and can be used for reference.
The idle equipment and facilities of the novel dry-process cement production line are effectively utilized, a new product field is developed, and enterprise benefits are increased.
Drawings
FIG. 1 is a schematic diagram of a novel dry process cement clinker firing system of the prior art.
Fig. 2 is a system structure diagram of the present invention.
In the figure: the device comprises a dust removal system waste gas pipeline 1, a raw material grinding system waste gas pipeline 2, a high-temperature fan 3, a waste heat recovery device 4, a preheater decomposing furnace 5, a C1 cyclone 5-1, a C2 cyclone 5-2, a C3 cyclone 5-3, a C4 cyclone 5-4, a C5 cyclone 5-5, a decomposing furnace 5-6, a gooseneck 5-7, a kiln tail smoke chamber 6, a rotary kiln 7, a grate cooler 8, a kiln head burner 9, a two-stage series suspension cooler 10, a CL1 cyclone 10-1, a CL2 cyclone 10-2, a cooler exhaust fan 11, an air release valve 12, an air inlet chamber 13, an auxiliary ignition chamber 14, a suspension calciner 15 and a cyclone separator 16. A is raw material powder, B is cement clinker, C is limestone powder, D is a powdered lime primary product, and E is a powdered lime finished product.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 2, the system for calcining and transforming lime powder based on the novel dry cement clinker sintering system comprises a preheater decomposing furnace 5 in the novel dry cement clinker sintering system, wherein the preheater decomposing furnace 5 comprises five-stage preheater cyclones 5-1, 5-2, 5-3, 5-4, 5-5 and a decomposing furnace 5-6, the preheater decomposing furnace is used as a primary suspension calcining system, and the system further comprises a secondary suspension calcining system and a suspension cooling system, wherein:
in the first-stage suspension calcination system, the limestone powder C is preheated by the cyclone cylinders 5-1, 5-2, 5-3 and 5-4 of the preheaters at all stages except the last stage in sequence and then enters a decomposing furnace 5-6, the limestone powder C is calcined in the decomposing furnace 5-6 to obtain a primary product D of powdered lime, and the primary product D of powdered lime enters the cyclone cylinder 5-5 of the last stage preheater through a gooseneck 5-7 to be separated and collected;
the secondary suspension calcining system comprises a suspension calcining furnace 15 and a cyclone separator 16, wherein the discharge end of a last stage preheater cyclone cylinder 5-5 in the primary suspension calcining system is connected with the feed end of the suspension calcining furnace 15, the discharge end of the suspension calcining furnace 15 is connected with the feed end of the cyclone separator 16, a collected lime powder primary product D is sent into the suspension calcining furnace 15 by the last stage preheater cyclone cylinder 5-5 in the primary suspension calcining system for further calcining to obtain a finished lime powder E, and the finished lime powder E is sent into the cyclone separator 16 from the suspension calcining furnace 15 for separation and collection;
the suspension cooling system comprises a two-stage series suspension cooler 10, the two-stage series suspension cooler 10 is formed by connecting two-stage suspension cooler cyclone cylinders 10-1 and 10-2 in series, wherein the feed end of the first stage suspension cooler cyclone 10-1 is connected with the discharge end of the cyclone separator 16 in the second stage suspension calcining system, the discharge end of the first stage suspension cooler cyclone 10-1 is connected with the feed end of the second stage suspension cooler cyclone 10-2, meanwhile, air is introduced into the feeding end of the second stage suspension cooler cyclone cylinder 10-2, the finished product powder lime E in the cyclone separator 16 is subjected to heat exchange and cooling in turn through the two stage suspension cooler cyclone cylinders 10-1 and 10-2, and finally the finished product powder lime E is collected by the second stage suspension cooler cyclone cylinder 10-2, and the finished product powder lime E is discharged from the discharge end of the second-stage suspension cooler cyclone cylinder 10-2.
In the primary suspension calcining system of the utility model, the original kiln tail smoke chamber of the decomposing furnace 5-6 is replaced by the air inlet chamber 13; the waste gas outlet end of the cyclone separator 16 in the secondary suspension calcining system is communicated with the air inlet of the air inlet chamber 13 of the decomposing furnace 5-6, and the waste gas discharged by the cyclone separator 16 enters the air inlet chamber 13 of the decomposing furnace 5-6 to be used as the combustion air and the suspension medium smoke of the decomposing furnace 5-6.
The utility model discloses still include waste heat recovery device 4 among the novel dry process cement clinker system of firing into, high temperature fan 3, the exhaust outlet end of first order preheater whirlwind section of thick bamboo 5-1 and waste heat recovery device 4's entrance connection in the system are calcined in the one-level suspension, waste heat recovery device 4's exit end and high temperature fan 3's entrance connection, high temperature fan 3's exit end and dust pelletizing system exhaust pipeline 1, at least one of the two of raw materials grinding system exhaust pipeline 2 is connected, the high temperature waste gas of first order preheater whirlwind section of thick bamboo 5-1 discharge is by behind the partial heat of waste heat recovery device 4 recovery, send to outside waste gas dust pelletizing system through high temperature fan 3 again, at least one of the two of raw materials grinding.
In the utility model, the suspension calciner 15 in the secondary suspension calcining system is provided with an auxiliary combustion ignition chamber 14, and combustion air and combustion fuel are introduced into the suspension calciner 15 by the auxiliary combustion ignition chamber 14 so as to ignite and improve the combustion air temperature of the suspension calciner;
the suspension cooling system also comprises a cooler exhaust fan 11, the hot air outlet end of the first-stage suspension cooler cyclone cylinder 10-1 in the suspension cooling system is connected with the inlet end of the cooler exhaust fan 11, the outlet end of the cooler exhaust fan 11 is connected with the inlet end of the auxiliary combustion ignition chamber 14, and most of the hot air exhausted by the first-stage suspension cooler cyclone cylinder 10-1 is sent to the auxiliary combustion ignition chamber 14 through the cooler exhaust fan 11 to support combustion of the suspension calciner.
In the utility model, the outlet end of the exhaust fan 11 of the cooler is connected with the exhaust gas pipeline 1 of the dust removing system through the air release valve 12, and the rest of the hot air exhausted by the first-stage suspension cooler 10-1 is sent into the exhaust gas pipeline 1 of the dust removing system through the exhaust fan 11 of the cooler and the air release valve 12.
In the utility model, the fuel used by the decomposing furnace and the suspension calcining furnace is one or the mixture of more of coal, natural gas, fuel oil and petroleum coke in any proportion.
The utility model discloses in, the decomposing furnace outlet temperature control of system is calcined in one-level suspension is at 850~930 ℃. The temperature of the outlet of the suspension calciner of the secondary suspension calcining system is controlled to be 900-980 ℃.
The utility model discloses reform transform the grog system of firing of novel dry process cement production line into powder lime second grade suspension and calcine cooling system, be used for producing powder lime. It is characterized in that:
(1) utilize current preheater dore furnace 5 as one-level suspension system of calcining
Limestone powder C serving as a raw material is firstly fed into an inlet pipeline of a first-stage preheater cyclone 5-1, is preheated by the preheater cyclones 5-1, 5-2, 5-3 and 5-4 step by step and then is collected by a fourth-stage preheater cyclone 5-4, and then enters a decomposing furnace 5-6, the limestone powder C serving as the raw material is calcined in the decomposing furnace 5-6 by fuel under the environment of combustion air, and a primary product D of powdered lime obtained after calcination is separated and collected by a fifth-stage preheater cyclone 5-5.
The utility model changes the kiln tail smoke chamber under the existing decomposing furnace 5-6 into the air inlet chamber 13, and introduces combustion air and suspension medium smoke for the decomposing furnace 5-6.
After part of heat is recovered by the waste heat recovery device 4, the high-temperature waste gas at the outlet of the cyclone cylinder 5-1 of the first-stage preheater is sent to an external waste gas dedusting system or a raw material grinding system through the high-temperature fan 3.
(2) Adding a two-stage suspension calcining system
The secondary suspension calcining system comprises a suspension calcining furnace 15, a cyclone separator 16, an auxiliary combustion ignition chamber 14 and the like, and further decomposes a powdered lime primary product D obtained by the primary suspension calcining system.
The primary product D of the powdered lime collected by the cyclone 5-5 of the fifth-stage preheater enters a newly added suspension calciner 15 through a discharge pipe, the primary product D of the powdered lime is further calcined in the suspension calciner 8 in a combustion air environment by using fuel, the suspension calciner 15 is initially in a pure air environment, wherein the carbon dioxide partial pressure is lower than the flue gas, and the oxygen partial pressure is higher than the flue gas, so that the fuel combustion and the further decomposition of the calcium carbonate which is not decomposed in the primary product D of the powdered lime are facilitated. The finished product powder lime E obtained after the calcination is separated and collected by a cyclone separator 16, and the waste gas at the outlet of the cyclone separator 16 is sent to an air inlet chamber 13 below the decomposing furnace 5-6 by a pipeline to be used as the combustion air and the suspension medium flue gas of the decomposing furnace 5-6.
The lower end of the suspension calciner 15 is connected with an auxiliary combustion ignition chamber 14 through a necking, and the auxiliary combustion ignition chamber 14 introduces combustion air into the suspension calciner 15, ignites and burns fuel to increase the temperature of the combustion air.
(3) Adding a suspension cooling system
The suspension cooling system comprises a secondary suspension cooler 10, a cooler exhaust fan 11 and the like which are connected in series, and the finished product powder lime E of the secondary suspension calciner is cooled.
The finished product powder lime E out of the suspension calciner 15 is separated and collected by a cyclone separator 16, then is fed into an inlet pipeline of a first-stage suspension cooler cyclone cylinder 10-1, and is separated from the first-stage suspension cooler cyclone cylinder 10-1 through heat exchange; then feeding into an inlet pipeline of a second stage suspension cooler cyclone cylinder 10-2, wherein cold air enters from the feeding end of the second stage suspension cooler cyclone cylinder 10-2, and is separated and collected by the second stage suspension cooler cyclone cylinder 10-2 through heat exchange.
The second-stage series suspension cooler 10 cools the finished product powder lime E to obtain hot air at the outlet of the cyclone cylinder 10-1 of the first-stage suspension cooler, most of the hot air is sent into the suspension calciner 15 through the cooler exhaust fan 11 to be burnt and supported by fuel, and a small part of redundant hot air is sent into the pipeline 1 of the waste gas dedusting system through the air release valve 12.
In the embodiment, the outlet temperature of the decomposing furnace 5-6 of the primary suspension calcining system is controlled to be 850-930 ℃, and the outlet temperature of the suspension calcining furnace 15 of the secondary suspension calcining system is controlled to be 900-980 ℃.
In this embodiment, the fuel used in the decomposing furnaces 5 to 6 and the suspension calcining furnace 15 is one or more of coal, natural gas, fuel oil and petroleum coke.
In this embodiment, the number of the preheater of the existing preheater decomposing furnace 5 is five, but not limited thereto. And six or four stages are also possible.
In this embodiment, various optimization modifications may be performed on the constituent units of the existing preheater decomposing furnace 5 for the purpose of reducing resistance, increasing efficiency, and the like, including increasing or decreasing the number of the primary preheaters.
In this embodiment, the number of stages in which the two-stage series suspension coolers 10 are connected in series is two, but is not limited thereto. Three stages are also possible.
In this embodiment, the hot air of the secondary suspension cooler 10 may be introduced to the fuel pulverizing system as a heat source for drying the fuel.
The embodiments of the present invention are only descriptions of the preferred embodiments of the present invention, not right the present invention is designed and limited, without departing from the design concept of the present invention, the technical personnel in the field should fall into the protection scope of the present invention for various modifications and improvements made by the technical solution of the present invention, and the technical contents of the present invention are all recorded in the claims.
Claims (7)
1. Powder lime calcination transformation system based on novel dry process cement clinker system of firing burns, including the preheater dore furnace in the novel dry process cement clinker system of firing, the preheater dore furnace includes multistage preheater whirlwind section of thick bamboo, dore furnace, its characterized in that: regard as one-level suspension system of calcining with preheater dore furnace, still include second grade suspension system of calcining, suspension cooling system, wherein:
in the first-stage suspension calcining system, limestone powder as a raw material is sequentially preheated by the cyclone cylinders of all stages of preheaters except the last stage and then enters a decomposing furnace, the limestone powder is calcined in the decomposing furnace to obtain a primary product of powdered lime, the primary product of powdered lime enters the cyclone cylinders of the last stage of preheaters for separation and collection,
the secondary suspension calcining system comprises a suspension calcining furnace and a cyclone separator, wherein the discharge end of a cyclone cylinder of a last stage preheater in the primary suspension calcining system is connected with the feed end of the suspension calcining furnace, the discharge end of the suspension calcining furnace is connected with the feed end of the cyclone separator, the collected primary powdered lime product is sent into the suspension calcining furnace by the cyclone cylinder of the last stage preheater in the primary suspension calcining system for further calcining to obtain finished powdered lime, and the finished powdered lime is sent into the cyclone separator for separation and collection by the suspension calcining furnace;
the suspension cooling system comprises multistage series suspension coolers, the multistage series suspension coolers are formed by connecting multistage suspension cooler cyclone cylinders in series, wherein the feed end of a first stage suspension cooler cyclone cylinder is connected with the discharge end of a cyclone separator in the second stage suspension calcining system, the discharge end of an adjacent previous stage suspension cooler cyclone cylinder is connected with the feed end of a next stage suspension cooler cyclone cylinder, the finished product powder lime in the cyclone separator is subjected to heat exchange cooling in sequence through the multistage suspension cooler cyclone cylinders, the finished product powder lime is finally collected by the last stage suspension cooler cyclone cylinder, and the finished product powder lime is discharged from the discharge end of the last stage suspension cooler cyclone cylinder.
2. The system of claim 1, wherein the system comprises: in the primary suspension calcining system, an original kiln tail smoke chamber of the decomposing furnace is replaced by an air inlet chamber; and the waste gas outlet end of the cyclone separator in the secondary suspension calcining system is communicated with the air inlet of the air inlet chamber of the decomposing furnace, and the waste gas discharged by the cyclone separator enters the air inlet chamber of the decomposing furnace to be used as combustion air and suspension medium flue gas of the decomposing furnace.
3. The system of claim 1, wherein the system comprises: still include the waste heat recovery device among the novel dry process cement clinker system of firing into, the high temperature fan, the waste gas outlet end and the inlet connection of waste heat recovery device of first order preheater whirlwind section of thick bamboo in the system are calcined in the one-level suspension, the outlet end of waste heat recovery device and the inlet connection of high temperature fan, the outlet end and the dust pelletizing system exhaust gas pipeline of high temperature fan, at least one of the two of raw materials grinding system exhaust gas pipeline is connected, after the high temperature waste gas of first order preheater whirlwind section of thick bamboo discharge was retrieved partial heat by waste heat recovery device, send outside waste gas dust pelletizing system to through the high temperature fan again, at least one of the two.
4. The system of claim 1, wherein the system comprises: the suspension calciner in the secondary suspension calcining system is provided with an auxiliary combustion ignition chamber, and combustion air and combustion fuel are introduced into the suspension calciner from the auxiliary combustion ignition chamber so as to ignite and improve the combustion air temperature of the suspension calciner;
the suspension cooling system also comprises a cooler exhaust fan, the hot air outlet end of the first stage suspension cooler cyclone cylinder in the suspension cooling system is connected with the inlet end of the cooler exhaust fan, the outlet end of the cooler exhaust fan is connected with the inlet end of the auxiliary combustion ignition chamber, and most of hot air exhausted by the first stage suspension cooler cyclone cylinder is sent into the auxiliary combustion ignition chamber through the cooler exhaust fan to support combustion of the suspension calciner.
5. The pulverized lime calcination modification system based on the novel dry cement clinker firing system as claimed in claim 3 or 4, wherein: the outlet end of the exhaust fan of the cooler is also connected with a waste gas pipeline of the dust removal system through an air release valve, and the rest of hot air exhausted by the cyclone cylinder of the first-stage suspension cooler is sent to the waste gas pipeline of the dust removal system through the exhaust fan of the cooler and the air release valve.
6. The system of claim 1, wherein the system comprises: and the outlet temperature of the decomposing furnace of the primary suspension calcining system is controlled to be 850-930 ℃.
7. The system of claim 1, wherein the system comprises: and the temperature of the outlet of the suspension calciner of the secondary suspension calcining system is controlled to be 900-980 ℃.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111977995A (en) * | 2020-09-23 | 2020-11-24 | 合肥水泥研究设计院有限公司 | Powder lime calcining and reforming system based on novel dry-process cement clinker calcining system |
| WO2022256925A1 (en) * | 2021-06-09 | 2022-12-15 | Refratechnik Holding Gmbh | Production of calcined material with separate calcination of exhaust dust |
| CN116854383A (en) * | 2023-06-29 | 2023-10-10 | 唐金泉 | Novel low-energy-consumption process system for producing light-burned MgO powder |
-
2020
- 2020-09-23 CN CN202022107358.8U patent/CN212669567U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111977995A (en) * | 2020-09-23 | 2020-11-24 | 合肥水泥研究设计院有限公司 | Powder lime calcining and reforming system based on novel dry-process cement clinker calcining system |
| WO2022256925A1 (en) * | 2021-06-09 | 2022-12-15 | Refratechnik Holding Gmbh | Production of calcined material with separate calcination of exhaust dust |
| CN116854383A (en) * | 2023-06-29 | 2023-10-10 | 唐金泉 | Novel low-energy-consumption process system for producing light-burned MgO powder |
| CN116854383B (en) * | 2023-06-29 | 2024-04-19 | 唐滨江 | Novel low-energy-consumption process system for producing light-burned MgO powder |
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