CN213680338U - Flue gas recirculation coupling sludge drying mechanism and flue gas recirculation system - Google Patents
Flue gas recirculation coupling sludge drying mechanism and flue gas recirculation system Download PDFInfo
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- CN213680338U CN213680338U CN202022610599.4U CN202022610599U CN213680338U CN 213680338 U CN213680338 U CN 213680338U CN 202022610599 U CN202022610599 U CN 202022610599U CN 213680338 U CN213680338 U CN 213680338U
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Abstract
The utility model relates to the technical field of sludge resource utilization, in particular to a flue gas recirculation coupling sludge drying mechanism and a flue gas recirculation system, wherein the sludge drying mechanism comprises a sludge drying machine, a gas-solid separation device and a tail gas dehumidification device; the sludge drier, the gas-solid separation device and the tail gas dehumidification device are communicated in sequence; the flue gas recirculation system respectively leads out flue gas from the front of the air preheater and the rear of the dust remover to prepare mixed flue gas; the mixed flue gas is led to a sludge drier for drying sludge; and mixing the tail gas treated by the tail gas dehumidifying device with air, heating the mixture in an air preheater, and introducing the heated mixture into the hearth as primary air. The utility model provides a mechanism and system can effectively utilize coal fired power plant's flue gas to carry out the mummification to mud and handle, reduce the mud moisture content, get rid of moisture in the mummification mud tail gas and burn tail gas once more and decompose the pollutant to solve the direct emission of mud mummification tail gas that exists among the prior art, very easily cause secondary pollution's problem.
Description
Technical Field
The utility model belongs to the technical field of the mud utilization technique and specifically relates to a flue gas recirculation coupling sludge drying mechanism and flue gas recirculation system are related to.
Background
With the continuous development of economy and the continuous acceleration of urban environment construction, the sewage treatment capacity and the treatment scale in China are larger and larger, and the sludge produced is larger and larger. Sludge is an unavoidable byproduct in the sewage treatment process, generally contains pathogenic microorganisms, parasitic ova, harmful heavy metals and a large amount of difficultly-degradable substances, and easily causes secondary pollution to the environment if the treatment is not thorough. Therefore, the sludge produced by the urban sludge treatment facility is required to be subjected to stabilization and harmless treatment and encourages resource utilization. However, the sludge treatment capacity of sewage treatment plants in China is insufficient, the means is backward, a large amount of sludge is not treated in a standardized way, and secondary pollution is directly brought to water, soil and the atmosphere, which seriously threatens the ecological environment. Therefore, the harmless treatment and disposal of the sludge become a difficult problem which puzzles governments in various parts of China gradually.
The sludge disposal method mainly comprises three modes of sanitary landfill, land utilization and incineration, wherein the sanitary landfill is a traditional sludge treatment method, and the proportion of sludge landfill is gradually reduced in various countries in the world due to the fact that a large amount of land is occupied and secondary pollution is generated; the land utilization refers to that the sludge is utilized in the soil to improve the soil condition or improve the fertility of the soil, but the sludge contains toxic and harmful substances, and the land utilization of the sludge can cause potential pollution threat to the environment; sludge incineration is a treatment mode which is widely applied in recent years, and has the advantages of obvious volume reduction effect, capability of thoroughly treating most organic matters and microorganisms in sludge through incineration and relatively easy control of negative effects on the environment.
At present, sludge drying processes adopted by coal-fired power plants in China are mainly divided into flue gas drying processes and steam drying processes. Compared with a steam drying process, the flue gas drying process system is relatively simple, and the investment and operation cost is low, so that the method has certain competitive advantages. The core of the flue gas drying process is a drier, and sludge in the drier directly contacts with flue gas at the tail of a boiler to exchange heat so as to promote the evaporation of water in the sludge. However, the components of the sludge are complex and rich in organic matters, fats, microbial cells, inorganic matters and the like, so that in the process of heating the sludge to evaporate water, the components of the sludge are heated to volatilize or pyrolyze, malodorous gases such as ammonia gas, hydrogen sulfide, alkane and the like are released, and the sludge drying tail gas containing the malodorous gases is not treated to cause secondary pollution.
Therefore, the utility model provides a flue gas recirculation coupling sludge drying mechanism and flue gas recirculation system to solve the sludge drying tail gas direct emission that exists among the prior art, very easily cause secondary pollution's problem.
SUMMERY OF THE UTILITY MODEL
The first purpose of the utility model is to provide a flue gas recirculation coupling sludge drying mechanism, which can effectively remove the water in the dried sludge tail gas and reduce the influence on the boiler efficiency;
a second object of the present invention is to provide a flue gas recirculation system, which can effectively reduce NO in the furnacexThe original production amount of (1).
The utility model provides a flue gas recirculation coupling sludge drying mechanism, which comprises a sludge drying machine, a gas-solid separation device and a tail gas dehumidification device;
wherein the sludge drier, the gas-solid separation device and the tail gas dehumidification device are communicated in sequence;
the sludge drier and the tail gas dehumidifying device are respectively communicated with the incineration boiler.
Further, the tail gas dehumidifying device comprises a box body and a condensing assembly arranged in the box body;
the opposite surfaces of the box body which are communicated are respectively provided with a gas inlet and a gas outlet;
and a cooling coal medium inlet and a cooling coal medium outlet which are communicated with the condensing assembly are arranged on two adjacent side walls of two communicated surfaces of the box body, the cooling coal medium inlet is positioned on the upper part of the box body, and the cooling coal medium outlet is positioned on the lower part of the box body.
Further, the condensation component comprises a plurality of layers of baffle components which are arranged in parallel, and each layer of baffle component consists of a plurality of baffle tubes which are arranged in parallel and at equal intervals;
and two ends of each baffling pipe are respectively communicated with the cooling coal medium inlet and the cooling coal medium outlet.
Furthermore, two side walls which are adjacent to two opposite through surfaces of the box body are respectively provided with a cooling coal medium inlet chamber and a cooling coal medium outlet chamber;
the cooling coal inlet is arranged at the upper part of the cooling coal medium inlet chamber, and the cooling coal outlet is arranged at the lower part of the cooling coal medium outlet chamber.
Further, the bottom of box is provided with the water catch bowl, the drain pipe has been seted up to the bottom of water catch bowl.
The utility model also discloses a flue gas recirculation system, which comprises an incineration boiler, an air preheater, a dust remover, a gas premixing device and the sludge drying mechanism;
the smoke outlet end of the incineration boiler is communicated with the inlet end of the air preheater, the outlet end of the air preheater is communicated with the inlet end of the dust remover, the front flue of the inlet end of the air preheater is communicated with the inlet end of the sludge drying machine, and the outlet end of the dust remover is communicated with the inlet end of the sludge drying machine;
the outlet end of the tail gas dehumidifying device is communicated with the inlet end of the gas premixing device, and the outlet end of the gas premixing device is communicated with the primary air inlet end of the incineration boiler through the air preheater.
Further, the flue gas recirculation system also comprises a desulfurizing tower and a chimney;
the flue gas inlet end of the desulfurizing tower is communicated with the outlet end of the dust remover;
and the flue gas outlet end of the desulfurizing tower is communicated with the chimney.
Further, the air preheater the dust remover with on the passageway of sludge drying machine intercommunication, tail gas dehydrating unit with on the passageway of gas premixing device intercommunication the gas premixing device with all be provided with the draught fan on the passageway of air preheater intercommunication.
The utility model discloses a flue gas recirculation coupling sludge drying mechanism compares with prior art, has following advantage:
the utility model discloses a flue gas circulation coupling sludge drying mechanism, which comprises a sludge drying machine, a gas-solid separation device and a tail gas dehumidification device; the sludge drying machine is used for drying the sludge by using the waste heat of the flue gas, so that the water content of the sludge is reduced; the gas-solid separation device separates the sludge and the tail gas exhausted by the sludge drier, and the exhausted tail gas containing the odor pollutants is conveyed to the tail gas dehumidification device through a pipeline so as to reduce the moisture in the tail gas, and the tail gas with the moisture removed is introduced into a hearth of the incineration boiler to be incinerated, so that the corrosion to an induced draft fan and the pipeline can be reduced, and the influence of the tail gas on the thermal efficiency of the incineration boiler is reduced. To sum up, the utility model discloses a sludge drying mechanism can effectively utilize coal fired power plant's flue gas to carry out the mummification to mud and handle, reduces the mud moisture content, gets rid of moisture in the mummification mud tail gas and burn tail gas once more and decompose the pollutant to solve the problem that the mud mummification tail gas that exists causes secondary pollution among the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the sludge drying mechanism of the present invention;
FIG. 2 is a schematic view of the exhaust gas dehumidifier of the present invention;
fig. 3 is a schematic view of the flue gas recirculation system of the present invention.
Description of reference numerals:
1: a sludge drier; 2: a gas-solid separation device; 3: a tail gas dehumidification device; 4: an incineration boiler; 5: a box body; 6: a gas inlet; 7: a gas outlet; 8: a cooling coal inlet; 9: a cooling coal medium outlet; 10: a baffling pipe; 11: cooling the coal medium discharge chamber; 12: a cooling medium discharge chamber; 13: a water collection tank; 14: a drain pipe; 15: a dust remover; 16: a gas premixing device; 17: an air preheater; 18: a desulfurizing tower; 19: a chimney; 20: an induced draft fan.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-3, the flue gas recirculation coupling sludge drying mechanism provided by the present invention comprises a sludge drying machine 1, a gas-solid separation device 2 and a tail gas dehumidification device 3; wherein the sludge drier 1, the gas-solid separation device 2 and the tail gas dehumidification device 3 are communicated in sequence; the sludge drier 1 and the tail gas dehumidifying device 3 are respectively communicated with an incineration boiler 4.
The utility model provides a sludge drying mechanism, which comprises a sludge drying machine 1, a gas-solid separation device 2, a tail gas dehumidification device 3 and a dried sludge collection device, wherein the sludge drying machine 1 is communicated with an incineration boiler 4 so as to effectively utilize the residual heat of flue gas to carry out drying treatment on sludge, and the water content of the sludge is reduced; the gas-solid separation device 2 is communicated with the sludge drier 1 and can separate sludge and tail gas discharged by the sludge drier 1; the separated dried sludge and the dried sludge generated by the sludge drier 1 are conveyed to a dried sludge collecting device, and the discharged tail gas containing malodorous pollutants is conveyed to a tail gas dehumidifying device 3 through a pipeline so as to reduce the moisture in the tail gas; the tail gas with the moisture removed is introduced into the hearth of the incineration boiler 4 for incineration, so that the corrosion to the induced draft fan 20 and the pipeline can be reduced, and the influence of the tail gas on the heat efficiency of the incineration boiler 4 can be reduced. Therefore, the utility model discloses a sludge drying mechanism can effectively utilize coal fired power plant's flue gas to carry out the mummification to mud and handle, reduces mud moisture content to 30-40%, gets rid of moisture in the mummification mud tail gas, and burns tail gas once more and decomposes the pollutant, can solve the problem that the mud mummification tail gas that exists causes secondary pollution among the prior art.
The sludge drier 1 can be a drum drier or a rotary flash drier, if the drum drier can directly discharge semi-dried sludge, the gas-solid separation device 2 at the rear end only discharges a small amount of semi-dried sludge, and if the drum drier is a rotary flash drier, all the semi-dried sludge needs to be discharged through the gas-solid separation device 2; the gas-solid separation device 2 can be a cyclone separator.
On the basis of the technical scheme, the tail gas dehumidifying device 3 further comprises a box body 5 and a condensing assembly arranged in the box body 5; the opposite surfaces of the box body 5 which are communicated are respectively provided with a gas inlet 6 and a gas outlet 7; and a cooling coal medium inlet 8 and a cooling coal medium outlet 9 communicated with the condensing assembly are arranged on two adjacent two opposite side walls penetrating through the box body 5, the cooling coal medium inlet 8 is positioned at the upper part of the box body 5, and the cooling coal medium outlet 9 is positioned at the lower part of the box body 5.
Specifically the utility model discloses a tail gas dehydrating unit 3 includes box 5 and sets up at the inside condensation subassembly of box 5, and wherein, gas inlet 6 and gas outlet 7 have been seted up respectively to the opposite that box 5 link up mutually, and box 5 link up and is provided with the cooling coal that is linked together with the condensation subassembly on the both sides wall that the opposite faces is adjacent and mediate entry 8 and cooling coal and mediate export 9. During the use, inject cooling coal by cooling coal and mediate 8 to the condensation subassembly, tail gas gets into box 5 by gas inlet 6, and the heat transfer of tail gas and condensing parts realizes getting rid of moisture in the tail gas.
On the basis of the above technical solution, it is further preferable that the condensation assembly includes a plurality of layers of parallel baffle members, and each layer of the baffle members is composed of a plurality of parallel baffle pipes 10 arranged at equal intervals; two ends of all the baffling pipes 10 are respectively communicated with the cooling coal inlet 8 and the cooling coal outlet 9.
The condensation subassembly specifically includes multilayer parallel arrangement's baffling part, and every layer of baffling part comprises a plurality of parallel equidistance arrangement's baffling pipe 10, and the area of contact that tail gas and cooling coal were situated between can be showing to the setting of a plurality of baffling pipes 10, improves moisture and gets rid of efficiency.
On the basis of the above preferred technical solution, further, a cooling coal medium inlet chamber 11 and a cooling coal medium outlet chamber 12 are respectively provided on two side walls that are adjacent to two opposite surfaces of the box body 5; the cooling medium inlet 8 is provided at an upper portion of the cooling medium inlet chamber 11, and the cooling medium outlet 9 is provided at a lower portion of the cooling medium outlet chamber 12.
In order to facilitate the injection and discharge of the cooling coal media in the baffle pipe 10, a cooling coal media inlet chamber 11 and a cooling coal media outlet chamber 12 are respectively arranged on two adjacent side walls of the box body 5 penetrating through two opposite surfaces, a cooling coal media inlet 8 is arranged at the upper part of the cooling coal media inlet chamber 11, a cooling coal media outlet 9 is arranged at the lower part of the cooling coal media outlet chamber 12, and the arrangement mode of the upper inlet and the lower outlet is also beneficial to improving the heat exchange efficiency of the cooling coal media and the tail gas.
On the basis of the above preferred technical solution, it is further preferred that a water collecting tank 13 is provided at the bottom of the box body 5, and a drain pipe 14 is provided at the bottom of the water collecting tank 13.
In order to collect the condensed water, a water collecting tank 13 is provided at the bottom of the case 5, and a drain pipe 14 is opened at the bottom of the water collecting tank 13.
On the basis of the preferred technical scheme, more preferably, the system further comprises a dried sludge crushing device, a dried sludge conveying device and a fuel sludge blending device which are sequentially communicated end to end; the dried sludge crushing device is communicated with the dried sludge collecting device; the fuel sludge blending device is communicated with the incineration boiler 4.
For the recycle of mummification mud, the utility model discloses a sludge drying mechanism is still including the mummification mud breaker of head and the tail intercommunication in proper order, mummification mud transmission device and fuel sludge mixing device, wherein, mummification mud breaker and mummification mud collection device intercommunication, mummification mud in the mummification mud collection device carries out broken handle at first by mummification mud breaker promptly, the rethread is done dry sludge transmission device and is carried to fuel sludge mixing device and mixes with other fuels, mummification mud after final fuel sludge mixing device will mix is carried to incineration boiler 4 and is burned the utilization once more.
The utility model also discloses a flue gas recirculation system, which comprises an incineration boiler 4, an air preheater 17, a dust remover 15, a gas premixing device 16 and the sludge drying mechanism; the flue gas outlet end of the incineration boiler 4 is communicated with the inlet end of the air preheater 17, and the outlet end of the air preheater 17 is communicated with the inlet end of the dust remover 15; the inlet end front flue of the air preheater 17 is communicated with the inlet end of the sludge drier 1, and the outlet end of the dust remover 15 is communicated with the inlet end of the sludge drier 1; the outlet end of the tail gas dehumidifying device 3 is communicated with the inlet end of the gas premixing device 16, and the outlet end of the gas premixing device 16 is communicated with the primary air inlet end of the incineration boiler 4 through the air preheater 17.
The utility model discloses a flue gas recirculation system includes incineration boiler 4, air preheater 17, dust remover 15, gas premixing device 16 and above-mentioned sludge drying mechanism, and incineration boiler 4's flue gas outlet end passes through air preheater 17 promptly andthe inlet end of the dust remover 15 is communicated, namely, the flue gas in the incineration boiler 4 is firstly subjected to primary cooling by the air preheater 17 and then is conveyed to the dust remover 15 for treatment, so that the damage of the high-temperature flue gas to pipelines and equipment can be reduced, and heat can be recovered; the flue gas is treated by a dust remover 15 and then enters a sludge drier 1 to dry sludge; the tail gas generated by the sludge drier 1 is separated from the semi-dried sludge by the gas-solid separation device 2; the tail gas enters a tail gas dehumidifying device 3 to remove moisture in the tail gas, and the tail gas with the moisture removed finally enters a gas premixing device 16 to be mixed with air and then is input into an incineration boiler 4 to be incinerated, so that harmful pollutants are decomposed as much as possible; and the outlet end of the gas premixing device 16 is communicated with the primary air inlet end of the incineration boiler 4 through the air preheater 17, that is, the mixed gas in the gas premixing device 16 is firstly subjected to primary temperature rise through the air preheater 17 and then is conveyed to the incineration boiler 4 for incineration, so that the influence of the mixed gas on the thermal efficiency of the incineration boiler 4 can be reduced. Therefore, the utility model discloses a flue gas recirculation system lets in after dehumidifying with the tail gas that the sludge drying in-process produced and burns 4 furnace of incineration boiler, can effectively get rid of pollutant in the tail gas, reduces the O of going into in the stove air with tail gas recycle simultaneously2Content of NO in the hearthxThe original generation amount of the denitration catalyst can greatly reduce the flue gas denitration treatment cost of the coal-fired power plant.
In addition, the gas of the flue gas of the incineration boiler 4 entering the sludge drying machine 1 can also be a mixture of part of the flue gas passing through the air preheater 17 and the dust remover 15 and part of the flue gas not passing through the air preheater 17, and the temperature of the flue gas entering the sludge drying machine 1 is about 140-160 ℃ by adjusting the parameters of the air preheater 17 or the proportion of the two gases.
On the basis of the technical scheme, the device further preferably comprises a desulfurizing tower 18 and a chimney 19; the flue gas inlet end of the desulfurizing tower 18 is communicated with the outlet end of the dust remover 15; the flue gas outlet end of the desulfurizing tower 18 is communicated with the chimney 19.
The utility model discloses a still include desulfurizing tower 18 and chimney 19 among the flue gas recirculation system, desulfurizing tower 18 can carry out desulfurization treatment back emission to exhaust most flue gas among the incineration boiler 4, and then reduces the pollution of sulphide to the air in the flue gas.
On the basis of the above preferred technical scheme, further, the air preheater 17, the dust remover 15 with all be provided with the draught fan 20 on the passageway of sludge drying machine 1 intercommunication, tail gas dehydrating unit 3 with on the passageway of gas premixing device 16 intercommunication, gas premixing device 16 with all be provided with on the passageway of air preheater 17 intercommunication.
In order to facilitate the transportation of gas among the devices, draught fans 20 are respectively arranged on a passage through which the air preheater 17, the dust remover 15 and the sludge drier 1 are communicated, a passage through which the tail gas dehumidifying device 3 and the gas premixing device 16 are communicated, and a passage through which the gas premixing device 16 and the air preheater 17 are communicated.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (8)
1. A flue gas recirculation coupling sludge drying mechanism is characterized by comprising a sludge drying machine (1), a gas-solid separation device (2) and a tail gas dehumidification device (3);
wherein the sludge drier (1), the gas-solid separation device (2) and the tail gas dehumidification device (3) are communicated in sequence;
the sludge drier (1) and the tail gas dehumidifying device (3) are respectively communicated with the incineration boiler (4).
2. The sludge drying mechanism according to claim 1, wherein the tail gas dehumidifying device (3) comprises a box body (5) and a condensing assembly arranged inside the box body (5);
a gas inlet (6) and a gas outlet (7) are respectively formed on the opposite surfaces of the box body (5) which are communicated with each other;
and the box body (5) is communicated with two adjacent side walls of two opposite surfaces, a cooling coal medium inlet (8) and a cooling coal medium outlet (9) which are communicated with the condensing assembly are arranged on the two adjacent side walls of the two opposite surfaces, the cooling coal medium inlet (8) is positioned on the upper part of the box body (5), and the cooling coal medium outlet (9) is positioned on the lower part of the box body (5).
3. The sludge drying mechanism according to claim 2, wherein the condensing assembly comprises a plurality of layers of parallel baffle members, and each layer of the baffle members is composed of a plurality of parallel baffle pipes (10) arranged at equal intervals;
two ends of all the baffling pipes (10) are respectively communicated with the cooling coal medium inlet (8) and the cooling coal medium outlet (9).
4. The sludge drying mechanism according to claim 3, wherein a cooling coal medium inlet chamber (11) and a cooling coal medium outlet chamber (12) are respectively arranged on two side walls which are adjacent to two opposite surfaces of the box body (5);
the cooling medium inlet (8) is disposed at the upper part of the cooling medium inlet chamber (11), and the cooling medium outlet (9) is disposed at the lower part of the cooling medium outlet chamber (12).
5. The sludge drying mechanism according to claim 4, wherein a water collecting tank (13) is arranged at the bottom of the box body (5), and a drain pipe (14) is arranged at the bottom of the water collecting tank (13).
6. A flue gas recirculation system, characterized by comprising an incineration boiler (4), an air preheater (17), a dust collector (15), a gas premixing device (16) and a sludge drying mechanism according to any one of claims 1-5;
the smoke outlet end of the incineration boiler (4) is communicated with the inlet end of the air preheater (17), the outlet end of the air preheater (17) is communicated with the inlet end of the dust remover (15), the inlet end front flue of the air preheater (17) is communicated with the inlet end of the sludge drier (1), and the outlet end of the dust remover (15) is communicated with the inlet end of the sludge drier (1);
the outlet end of the tail gas dehumidifying device (3) is communicated with the inlet end of the gas premixing device (16), and the outlet end of the gas premixing device (16) is communicated with the primary air inlet end of the incineration boiler (4) through the air preheater (17).
7. The flue gas recirculation system of claim 6, further comprising a desulfurization tower (18) and a stack (19);
the flue gas inlet end of the desulfurizing tower (18) is communicated with the outlet end of the dust remover (15);
and the flue gas outlet end of the desulfurizing tower (18) is communicated with the chimney (19).
8. The flue gas recirculation system of claim 7, wherein the air preheater (17), the dust collector (15) and the sludge drier (1) are communicated with each other through a passage, the tail gas dehumidifying device (3) and the gas premixing device (16) are communicated with each other through a passage, and an induced draft fan (20) is arranged on the gas premixing device (16) and the air preheater (17) through a passage.
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