Cement kiln grate cooler exhaust gas waste heat efficient utilization system

Abstract

The utility model discloses a cement kiln grate cooler waste gas waste heat efficient utilization system. The cement kiln grate cooler waste gas waste heat efficient utilization system comprises a grate cooler, a decomposing furnace, an AQC waste heat boiler and a kiln head dust collector. A kiln head cover is arranged at the kiln head part of the grate cooler, the kiln head cover is communicated with the decomposing furnace through a tertiary air pipe, and an air pipe valve is arranged on the tertiary air pipe. According to the cement kiln grate cooler waste gas waste heat efficient utilization system, hot air for waste heat power generation is cooled and compensated through medium-temperature and low-temperature air supply pipelines, the waste heat power generation air inlet temperature can be conveniently adjusted, the air inlet temperature is effectively prevented from being too high, and the temperature is prevented from being adjusted through a cold air valve; a medium-temperature air and low-temperature air mixed mode is adopted for drying hot air for the coal mill, utilization of low-temperature air of the grate cooler is increased, dependence on the medium-temperature air is reduced, the fire risk of the coal mill is eliminated, and operation safety and reliability of the coal mill are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cement kiln waste heat utilization technical field, concretely is a kind of cement kiln grate cooler waste gas waste heat efficient utilization system. BACKGROUND

[0002] AQC boiler is from cement kiln head grate cooler medium temperature section air taking, waste gas temperature is around 380 DEG C~400 DEG C, belongs to medium temperature smoke wind, and the existing waste heat utilization system has the following deficiencies, one is AQC waste heat boiler air taking point close to grate cooler high temperature section, there is with second, third air stealing problem, when waste heat power generation hot air temperature is high, need through increasing cold air cooling;Two is that coal mill drying hot air is generally taken from grate cooler medium temperature section, and there is high temperature risk that coal mill is caused to burn and explode easily;Three is that kiln head waste gas is still discharged after step-by-step heat exchange by AQC boiler, about 100 DEG C low temperature waste gas, not fully recovered and utilized, cause certain waste heat waste. UTILITARY MODEL

[0003] (One) technical problem solved

[0004] In view of the deficiencies of prior art, the utility model provides a kind of cement kiln grate cooler waste gas waste heat efficient utilization system, solves the problems of low efficiency of existing cement kiln waste heat utilization system, and there is security risk.

[0005] (Two) technical scheme

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of cement kiln grate cooler waste gas waste heat efficient utilization system, including grate cooler, decomposition furnace, AQC waste heat boiler and kiln head dust collector.

[0007] The kiln head part of grate cooler is provided with kiln head cover, the kiln head cover is communicated with decomposition furnace by third air pipe, wherein, air pipe valve is arranged on the third air pipe.

[0008] Grate cooler is respectively provided with waste heat boiler air intake main pipe, coal mill air intake settling chamber and kiln head dust collector air intake pipe, wherein, waste heat boiler air intake main pipe is respectively provided with waste heat boiler cold air valve and waste heat power generation air intake flue valve, and kiln head dust collector air intake pipe is provided with grate cooler air outlet cold air valve.

[0009] The air outlet of waste heat boiler air intake main pipe is connected with waste heat boiler settling chamber, and the waste heat boiler settling chamber is communicated with AQC waste heat boiler, and the AQC waste heat boiler is communicated with kiln head dust collector by waste heat boiler air outlet pipe, wherein, waste heat boiler air outlet pipe is provided with waste heat boiler air outlet valve.

[0010] The top of the coal mill wind settling chamber is provided with a coal mill hot air induction pipe, a medium temperature section air pipe valve is arranged on the coal mill hot air induction pipe, the coal mill hot air induction pipe is communicated with a cyclone, and the cyclone is communicated with the coal mill through a coal mill hot air pipe.

[0011] One side of the kiln head dust collector is communicated with a kiln head exhaust cylinder through a kiln head air pipe and a kiln head fan, and a dust collector air outlet valve is arranged on the kiln head air pipe.

[0012] As a further optimization, the end of the kiln head air pipe is communicated with the middle section of the grate cooler through a circulating hot air pipe and a grate cooler cooling fan, and a circulating air pipe valve is arranged on the circulating hot air pipe.

[0013] As a further optimization, the middle part of the kiln head dust collector air inlet pipe is communicated with the cyclone through a coal mill low temperature air induction pipe, and a low temperature air control valve is arranged on the coal mill low temperature air induction pipe.

[0014] As a further optimization, the waste heat boiler air inlet main pipe is communicated with the kiln head dust collector air inlet pipe through a waste heat boiler low temperature air inlet pipe, and a waste heat power generation low temperature air inlet valve is arranged on the waste heat boiler low temperature air inlet pipe.

[0015] (Three) beneficial effects

[0016] The utility model provides a kind of cement kiln grate cooler waste gas waste heat efficient utilization system.It has the following

[0017] Beneficial effects:

[0018] 1, the hot air for waste heat power generation is cooled and compensated using medium temperature and low temperature air supply pipeline, which can facilitate the adjustment of waste heat power generation air inlet temperature, effectively prevent the air inlet temperature from being too high, and avoid adjusting the temperature using a cold air valve.

[0019] 2, the drying hot air for coal mill uses a medium temperature air and a low temperature air mixed mode, which increases the utilization of low temperature air for the grate cooler and reduces the dependence on medium temperature air.

[0020] 3, increase the coal mill hot air mixed cyclone, which facilitates reasonable control of air temperature, eliminates the risk of coal mill fire and improves the safety and reliability of coal mill operation.

[0021] 4, the waste gas of about 100 DEG C discharged by the kiln head dust collector is introduced into the grate cooler, which can increase the cooling air temperature of this section of the grate cooler from ambient temperature to 80-90 DEG C, and the kiln head boiler air inlet temperature can be increased by about 20 DEG C, and the unit clinker waste heat power generation capacity is increased by more than 0.8 kwh / t. At the same time, the kiln head secondary and tertiary air temperature will also be increased to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] In the diagram: 1. Grate cooler; 2. Decomposition furnace; 3. AQC waste heat boiler; 4. Kiln head dust collector; 5. Kiln head hood; 6. Tertiary air duct; 7. Duct valve; 8. Waste heat boiler inlet main pipe; 9. Waste heat boiler settling chamber; 10. Waste heat power generation inlet flue valve; 11. Waste heat boiler cold air valve; 12. Waste heat boiler outlet duct; 13. Waste heat boiler outlet valve; 14. Coal mill settling chamber; 15. Coal mill hot air induced draft duct; 16. Grate cooler intermediate temperature section duct valve; 17. Cyclone separator; 18. Kiln head dust collector 19. Dust collector inlet duct; 20. Grate cooler outlet cold air valve; 21. Coal mill hot air duct; 22. Coal mill; 23. Coal mill hot air duct valve; 24. Coal mill cold air valve; 25. Kiln head air duct; 26. Kiln head fan; 27. Dust collector outlet valve; 28. Kiln head exhaust stack; 29. ​​Circulating hot air duct; 30. Circulating air duct valve; 31. Coal mill low-temperature air induced draft duct; 32. Low-temperature air control valve; 33. Waste heat boiler low-temperature air inlet duct; 34. Waste heat power generation low-temperature air inlet valve; 35. Grate cooler cooling fan. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1 As shown, this utility model provides a technical solution: a high-efficiency utilization system for waste heat from a cement kiln grate cooler, including a grate cooler 1, a decomposition furnace 2, an AQC waste heat boiler 3, and a kiln head dust collector 4.

[0026] The kiln head of the grate cooler 1 is equipped with a kiln head cover 5, which is connected to the decomposition furnace 2 through a tertiary air duct 6. The tertiary air duct 6 is equipped with an air duct valve 7.

[0027] The grate cooler 1 is equipped with a waste heat boiler inlet pipe 8 in the medium and high temperature section, a coal mill air settling chamber 14 in the medium temperature section, and a kiln head dust collector inlet pipe 18 in the low temperature section. The waste heat boiler inlet pipe 8 is equipped with a waste heat boiler cold air valve 11 (which can supplement cold air and reduce the temperature of the hot air entering the AQC waste heat boiler 3) and a waste heat power generation inlet flue valve 10. The grate cooler outlet cold air valve 19 is equipped on the kiln head dust collector inlet pipe 18.

[0028] The outlet of the main air inlet pipe 8 of the waste heat boiler is connected with a waste heat boiler settling chamber 9, which is communicated with the AQC waste heat boiler 3, and the AQC waste heat boiler 3 is communicated with the kiln head dust collector 4 through a waste heat boiler air outlet pipe 12, wherein a waste heat boiler air outlet valve 13 is arranged on the waste heat boiler air outlet pipe 12.

[0029] A coal mill air settling chamber 14 is arranged on the top of the coal mill, and a coal mill hot air induction pipe 15 is arranged on the coal mill air settling chamber 14, wherein a grate cooler medium temperature section air pipe valve 16 is arranged on the coal mill hot air induction pipe 15, the coal mill hot air induction pipe 15 is communicated with a cyclone 17, the cyclone 17 is communicated with a coal mill 21 through a coal mill hot air pipe 20, wherein a coal mill hot air pipe valve 22 and a coal mill cold air valve 23 (cold air can be supplemented) are arranged on the coal mill hot air pipe 20.

[0030] A coal mill low-temperature air induction pipe 30 is arranged in the middle part of the kiln head dust collector air inlet pipe 18 and communicated with the cyclone 17, wherein a low-temperature air control valve 31 is arranged on the coal mill low-temperature air induction pipe 30.

[0031] The waste heat boiler low-temperature air inlet pipe 32 is communicated between the main air inlet pipe 8 of the waste heat boiler and the kiln head dust collector air inlet pipe 18, wherein a waste heat power generation low-temperature air inlet valve 33 is arranged on the waste heat boiler low-temperature air inlet pipe 32.

[0032] One side of the kiln head dust collector 4 is communicated with a kiln head exhaust cylinder 27 through a kiln head air pipe 24 and a kiln head fan 25, wherein a dust collector air outlet valve 26 is arranged on the kiln head air pipe 24, and the end of the kiln head air pipe 24 is communicated with the middle section of the grate cooler 1 through a circulating hot air pipe 28 and a grate cooler cooling fan 34, wherein a circulating air pipe valve 29 is arranged on the circulating hot air pipe 28.

[0033] Meanwhile, the contents not described in detail in the specification all belong to the prior art known to those skilled in the art.

[0034] In use, the air pipe valve 7 is opened, the three times air pipe 6 on the kiln head cover 5 introduces the high-temperature air generated by the heat exchange of the grate cooler 1 into the decomposing furnace 2, the waste heat power generation air inlet flue valve 10 is opened, the medium-high temperature air of the high-temperature section of the grate cooler 1 enters the waste heat boiler settling chamber 9 through the main air inlet pipe 8 of the waste heat boiler, after settling, is sent into the AQC waste heat boiler 3 for heat exchange, then the waste heat boiler air outlet valve 13 is opened, the hot air out of the AQC waste heat boiler 3 enters the kiln head dust collector 4 for treatment, finally the dust collector air outlet valve 26 and the kiln head fan 25 are opened, and the dust-free hot air is sent into the kiln head exhaust cylinder 27.

[0035] In order to solve the problem of high temperature of the air taking point of the AQC waste heat boiler 3 and the problem of air competition with the secondary and tertiary air, the low-temperature air inlet pipe 32 of the waste heat boiler is introduced, and the low-temperature air inlet valve 33 of the waste heat power generation is opened. The medium and low-temperature air in the kiln head dust collector air inlet pipe 18 can be sent into the waste heat boiler air inlet main pipe 8 through the low-temperature air inlet pipe 32 of the waste heat boiler, so as to supplement the air volume and reduce the temperature in the waste heat boiler air inlet main pipe 8 at the same time, achieving two goals at once.

[0036] Secondly, in order to solve the problem of high temperature of the hot air entering the coal mill 21 which is easy to cause fire, the medium temperature section air pipe valve 16 of the grate cooler and the coal mill hot air pipe valve 22 are opened synchronously. The hot air of the medium temperature section of the grate cooler 1 is settled in the coal mill air settling chamber 14 and then enters the cyclone 17 through the coal mill hot air inlet pipe 15. At the same time, part of the hot air of the low temperature section of the grate cooler 1 is directly sent into the kiln head dust collector 4, and the other part is sent into the cyclone 17 through the coal mill low-temperature air inlet pipe 30. The high and low temperature air is mixed in the cyclone 17, so as to reduce the temperature and finally enter the coal mill 21, thereby avoiding fire.

[0037] Finally, in order to solve the problem of treatment of the low-temperature exhaust gas, the circulating air pipe valve 29 is opened, and the low-temperature exhaust gas can re-enter the grate cooler 1 through the circulating hot air pipe 28 and the grate cooler cooling fan 34, so that the waste heat is fully utilized.

[0038] In summary, the cement kiln grate cooler waste heat efficient utilization system uses the medium and low-temperature air supply pipe to cool and compensate the hot air for waste heat power generation, which can facilitate the adjustment of the waste heat power generation air inlet temperature, effectively prevent the air inlet temperature from being too high, and avoid the use of a cold air valve to adjust the temperature. The drying hot air for the coal mill uses a mixed mode of medium temperature air and low temperature air, which increases the utilization of the low-temperature air of the grate cooler, reduces the dependence on the medium temperature air, eliminates the fire risk of the coal mill, and improves the operation safety and reliability of the coal mill.

[0039] It should be noted that the electrical components appearing in this document are all connected to the main controller and 220V or 380V mains electricity, and the main controller can be a conventional known device such as a computer, and its control principle, internal structure and control switch mode are all conventional means of prior art, which are directly quoted here without further description. In this document, relationship terms such as first and second are only used to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or sequence between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0040] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cement kiln grate cooler waste gas residual heat efficient utilization system, characterized in that: The application relates to a kiln head dust collector, which comprises a grate cooler (1), a decomposing furnace (2), an AQC waste heat boiler (3) and a kiln head dust collector (4). A kiln head cover (5) is arranged at the kiln head part of the grate cooler (1), and the kiln head cover (5) is communicated with the decomposing furnace (2) through a tertiary air pipe (6), wherein an air pipe valve (7) is arranged on the tertiary air pipe (6). A waste heat boiler air inlet main pipe (8), a coal mill air sink (14) and a kiln head dust collector air inlet pipe (18) are arranged on the grate cooler (1), wherein a waste heat boiler cold air valve (11) and a waste heat power generation air inlet flue valve (10) are arranged on the waste heat boiler air inlet main pipe (8), and a grate cooler air outlet cold air valve (19) is arranged on the kiln head dust collector air inlet pipe (18). An air outlet of the waste heat boiler air inlet main pipe (8) is connected with a waste heat boiler sink (9), the waste heat boiler sink (9) is communicated with the AQC waste heat boiler (3), the AQC waste heat boiler (3) is communicated with the kiln head dust collector (4) through a waste heat boiler air outlet pipe (12), wherein a waste heat boiler air outlet valve (13) is arranged on the waste heat boiler air outlet pipe (12). A coal mill hot air air guide pipe (15) is arranged on the top of the coal mill air sink (14), a grate cooler medium temperature section air pipe valve (16) is arranged on the coal mill hot air air guide pipe (15), the coal mill hot air air guide pipe (15) is communicated with a cyclone (17), the cyclone (17) is communicated with a coal mill (21) through a coal mill hot air pipe (20), wherein a coal mill hot air pipe valve (22) and a coal mill cold air valve (23) are arranged on the coal mill hot air pipe (20). One side of the kiln head dust collector (4) is communicated with a kiln head exhaust cylinder (27) through a kiln head air pipe (24) and a kiln head fan (25), wherein a dust collector air outlet valve (26) is arranged on the kiln head air pipe (24).

2. The system for efficient utilization of waste heat from exhaust gas of a grate cooler of a cement kiln according to claim 1, characterized in that: The end of the kiln head air pipe (24) is communicated with the middle section of the grate cooler (1) through a circulating hot air pipe (28) and a grate cooler cooling fan (34), wherein a circulating air pipe valve (29) is arranged on the circulating hot air pipe (28).

3. The system for efficient utilization of waste heat from exhaust gas of a grate cooler of a cement kiln according to claim 1, characterized in that: The middle part of the kiln head dust collector air inlet pipe (18) is communicated with the cyclone (17) through a coal mill low temperature air air guide pipe (30), wherein a low temperature air control valve (31) is arranged on the coal mill low temperature air air guide pipe (30).

4. The system for efficient utilization of waste heat from exhaust gas of a grate cooler of a cement kiln according to claim 1, characterized in that: The waste heat boiler air inlet main pipe (8) and the kiln head dust collector air inlet pipe (18) are communicated through a waste heat boiler low temperature air inlet pipe (32), wherein a waste heat power generation low temperature air inlet valve (33) is arranged on the waste heat boiler low temperature air inlet pipe (32).

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