CN115406252B - Cement kiln waste heat comprehensive utilization method based on one-time reheating technology - Google Patents
Cement kiln waste heat comprehensive utilization method based on one-time reheating technology Download PDFInfo
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- CN115406252B CN115406252B CN202210960262.7A CN202210960262A CN115406252B CN 115406252 B CN115406252 B CN 115406252B CN 202210960262 A CN202210960262 A CN 202210960262A CN 115406252 B CN115406252 B CN 115406252B
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- 239000002918 waste heat Substances 0.000 title claims abstract description 121
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000003303 reheating Methods 0.000 title claims abstract description 30
- 239000004568 cement Substances 0.000 title claims abstract description 26
- 238000005516 engineering process Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 230000005855 radiation Effects 0.000 claims abstract description 28
- 238000004064 recycling Methods 0.000 claims abstract description 21
- 238000001816 cooling Methods 0.000 claims abstract description 20
- 238000010248 power generation Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 14
- 230000008878 coupling Effects 0.000 claims abstract description 10
- 238000010168 coupling process Methods 0.000 claims abstract description 10
- 238000005859 coupling reaction Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 7
- 239000007789 gas Substances 0.000 claims description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- 239000003546 flue gas Substances 0.000 claims description 5
- 238000005422 blasting Methods 0.000 abstract 1
- 239000000779 smoke Substances 0.000 description 5
- 239000002912 waste gas Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
- F27D2017/006—Systems for reclaiming waste heat using a boiler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a comprehensive utilization method of cement kiln waste heat based on a primary reheating technology, which is characterized in that a waste heat coupling recycling structure and a low-pressure steam flow waste heat utilization structure are connected to a cement kiln waste heat power generation system, the method comprises the steps of installing a kiln cylinder radiation heat exchanger on a cement production line rotary kiln to enable the water supply temperature of a waste heat boiler to be increased to 55-65 ℃, installing a tail exhaust bypass valve between a kiln head exhaust fan and a chimney, and connecting a grate cooler cooling and blasting recycling system between the tail exhaust bypass valve and an air inlet of a kiln head grate cooler; a low-pressure steam reheating section is additionally arranged between the high-pressure evaporator section and the high-pressure superheater section of the AQC waste heat boiler and is used for reheating the high-pressure cylinder exhaust steam, the AQC boiler low-pressure superheater steam and the SP boiler low-pressure superheated steam, so that the temperature of the low-pressure steam is increased by 20-30 ℃; and (5) comprehensively utilizing waste heat. Compared with the traditional process, the waste heat power generation power can be improved by 40% -70% by the method.
Description
Technical Field
The invention relates to the technical field of waste heat utilization, in particular to a cement kiln waste heat comprehensive utilization method for a six-stage preheater.
Background
The temperature of waste heat resources waste gas which can be recycled in the cement industry is generally 200-400 ℃, at present, the Rankine cycle power generation technology taking water as a working medium in China is widely applied in the cement industry, and particularly for a second-generation cement burning system matched with a six-stage preheater, as the temperature of the outlet flue gas of a kiln tail preheater is only about 260 ℃, a combined superheating system is often configured for waste heat power generation to realize cascade utilization of waste gas resources, namely low-quality steam generated at the kiln tail is sent to a kiln head waste heat boiler and is sent to a turbo generator set after being superheated together with low-quality steam generated at the kiln head waste heat boiler. The existing cement kiln waste heat power generation system with combined overheat can be seen in the cement kiln pure low temperature waste heat power generation technology university published in 2009 of China building material industry Press; pages 11-13.
The flow of a conventional cement kiln waste heat power generation system with combined superheating is briefly described below with reference to fig. 1:
The smoke and wind system flow is as follows: the SP waste heat boiler 2 at the kiln tail takes air from an outlet descending air pipe 15 of the kiln tail preheater 14, and the waste gas at about 180 ℃ after heat exchange of the SP waste heat boiler is returned to the outlet descending air pipe and then sent to a waste gas treatment process through a high-temperature fan 12; the AQC waste heat boiler 1 of the kiln head takes air from the kiln head grate cooler 10, waste gas at about 100 ℃ after heat exchange of the AQC waste heat boiler 1 is returned to an air outlet pipeline of the grate cooler, and then is discharged to the atmosphere through the dust collector 9, the fan 16 and the kiln head chimney 0. The structure of the existing AQC waste heat boiler 1 is sequentially from top to bottom: a low-pressure public hot water section, a low-pressure evaporator section, a low-pressure superheater section, a high-pressure economizer section, a high-pressure evaporator section and a high-pressure superheater section,
The steam-water system flow is as follows: the water fed by the AQC waste heat boiler is deoxidized by the vacuum deoxidizer 7 and then is sequentially fed to the public hot water section of the AQC waste heat boiler 1 through the water feed pump 8 and the water feed pipeline g of the AQC boiler, and the water discharged from the hot water section enters the coal economizer section of the SP waste heat boiler through the water feed pipeline a of the SP boiler; the low pressure steam flow is as follows: the low-pressure steam generated by the AQC waste heat boiler 1 is combined with the low-pressure steam generated by the SP waste heat boiler 2 through a low-pressure steam pipeline c1 and then is fed into a low-pressure steam inlet of a steam turbine through a low-pressure steam parent pipeline c3, and the high-pressure steam flow is as follows: the main steam generated by the SP waste heat boiler is combined with the main steam generated by the AQC waste heat boiler through a SP boiler low-pressure steam pipeline b, and then is superheated in a joint superheating section of the AQC waste heat boiler to generate steam of 1.0-2.0 MPa, and the steam is sent to a main steam inlet of a steam turbine 3 through a main steam inlet pipeline d of the steam turbine to do work so as to drive a generator 4 to generate electric energy. The exhaust steam after acting is condensed into water through the condenser 5, the condensed water is sent into the vacuum deaerator 7 through the condensate pump 6 to deoxidize, and the deoxidized water is supplied to the hot water section of the AQC waste heat boiler 1 through the water supply pump 8 through the AQC boiler water supply pipeline g, so that a complete thermodynamic cycle system is formed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a cement kiln waste heat comprehensive utilization method based on a one-time reheating technology, which can improve waste heat power generation by 40% -70% compared with the traditional technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention discloses a cement kiln waste heat comprehensive utilization method based on a primary reheating technology, which comprises the following steps of:
The method comprises the steps that firstly, a waste heat coupling recycling structure and a low-pressure steam flow waste heat utilization structure are connected to a cement kiln waste heat power generation system, the waste heat coupling recycling structure comprises a kiln cylinder radiation heat exchanger arranged on a rotary kiln of a cement production line, the water inlet side of the kiln cylinder radiation heat exchanger is connected with a water outlet pipeline of a water supply pump, the water outlet side of the kiln cylinder radiation heat exchanger is connected with an AQC boiler water supply pipeline, and water discharged from the kiln cylinder radiation heat exchanger enters a public hot water section of the AQC waste heat boiler from the AQC boiler water supply pipeline;
A tail exhaust bypass valve is arranged on an air outlet pipeline between a kiln head exhaust fan and a kiln head chimney, a grate cooler cooling blast circulation recycling system is connected between the tail exhaust bypass valve and an air inlet of a kiln head grate cooler, the grate cooler cooling blast circulation recycling system comprises a circulating air pipeline, one end of the circulating air pipeline is connected with one valve port of the tail exhaust bypass valve, the other end of the circulating air pipeline is connected with one ends of a plurality of circulating air branch pipes, and the other end of each circulating air branch pipe is respectively connected with a high-temperature air adjusting valve, a high-temperature air blower and the air inlet of the kiln head grate cooler in sequence; a cooling air regulating valve is connected to a circulating air branch pipe at the air inlet of each high-temperature blower;
The low-pressure steam flow waste heat utilization structure comprises: a low-pressure steam reheating section is additionally arranged between a high-pressure evaporator section and a high-pressure superheater section of the AQC waste heat boiler, an outlet of a high-pressure cylinder of a steam turbine is connected with one end of a steam exhaust pipeline of the high-pressure cylinder, an outlet of the low-pressure superheater section of the AQC waste heat boiler is connected with one end of an outlet pipeline of the low-pressure superheater, an outlet of the SP waste heat boiler is connected with one end of a low-pressure steam pipeline of the SP waste heat boiler, the other end of the steam exhaust pipeline of the high-pressure cylinder, the other end of the outlet pipeline of the low-pressure superheater and the other end of the low-pressure steam pipeline of the SP waste heat boiler are connected with an inlet of a low-pressure reheat steam inlet pipeline together, an outlet of the low-pressure reheat steam inlet pipeline is connected with an inlet of a low-pressure steam mother pipeline of the steam turbine, and an outlet of the low-pressure mother pipeline of the steam turbine is connected with an inlet of the low-pressure cylinder of the steam turbine;
Step two, carrying out comprehensive utilization of waste heat, wherein the specific process is as follows:
The operation process of the waste heat coupling recycling structure is as follows: the waste heat boiler water at the outlet of the water supply pump enters a kiln cylinder radiation heat exchanger to exchange heat with radiation heat in the kiln cylinder radiation heat exchanger, the temperature of the waste heat boiler water supply after heat exchange is increased to 55-65 ℃, the waste heat boiler water supply is sent to the inlet of a public hot water section of the AQC waste heat boiler by an AQC boiler water supply pipeline, and meanwhile, flue gas with the temperature of 100-130 ℃ discharged from the tail end of the AQC waste heat boiler sequentially passes through a kiln head dust collector (9), a kiln head exhaust fan (16), a high temperature air adjusting valve (20), a high temperature air blower (22), a grate cooler air inlet and a grate cooler air outlet and then enters the AQC waste heat boiler to exchange heat of gas and water, wherein the temperature of the flue gas discharged from the grate cooler air outlet is 250-350 ℃;
the operation process of the low-pressure steam flow waste heat utilization structure is as follows: the steam turbine high-pressure cylinder exhaust steam with the pressure of 0.3-0.5 MPa flows into a high-pressure cylinder exhaust steam pipeline (f), the low-pressure steam with the pressure of 0.3-0.5 MPa flowing out of an outlet of the SP waste heat boiler flows into a SP boiler low-pressure steam pipeline (b), the low-pressure steam with the pressure of 0.3-0.5 MPa generated by a low-pressure superheater section of the AQC waste heat boiler flows into a low-pressure superheater section steam pipeline, and the low-pressure steam flowing out of the high-pressure cylinder exhaust steam pipeline (f), the SP boiler low-pressure steam pipeline (b) and the low-pressure superheater section steam pipeline are converged and then jointly enter a low-pressure steam reheating section of the AQC waste heat boiler to enable the temperature of the low-pressure steam to be increased by 20-30 ℃, and then sequentially enter a steam turbine low-pressure steam inlet through a low-pressure steam reheating section outlet, the low-pressure steam pipeline and the AQC low-pressure steam pipeline.
Compared with the prior art, the invention has the following advantages:
(1) The kiln head is added with a grate cooler tail gas recycling system 23. And returning the smoke exhaust part at the tail of the original kiln head dust collector at about 100 ℃ to the inlet of the kiln head grate cooler 10, recycling hot air on the premise of ensuring the cooling effect of the quenching section of the grate cooler and the clinker at the tail, and improving the air taking temperature of the AQC waste heat boiler, thereby improving the power of a waste heat power generation system.
(2) A certain number of barrel radiation heat exchangers are arranged on the external application of the rotary kiln, the kiln barrel radiation heat is fully utilized to heat the AQC boiler water supply under the premise of ensuring that the overhaul, barrel scanning, kiln inner temperature and the like of the kiln are not influenced, the water supply temperature is increased, on the one hand, the exhaust gas temperature of the AQC boiler is improved, and meanwhile, the temperature of circulating air in a grate cooler tail gas circulating and recycling system is increased, and the steam yield of the AQC waste heat boiler is increased.
(3) Compared with the traditional process, the waste heat power generation power can be improved by 40% -70% by the method.
Drawings
FIG. 1 is a flow chart of a conventional cement kiln waste heat power generation system;
fig. 2 is a flow chart of a comprehensive utilization method of cement kiln waste heat based on a primary reheating technology.
1. An AQC waste heat boiler; 2. an SP waste heat boiler; 3. a steam turbine; 4. a generator; 5. a condenser; 6. a condensate pump; 7. a vacuum deaerator; 8. a water feed pump; 9. a kiln head dust collector; 10. a kiln head grate cooler; 11. a rotary kiln; 12. kiln tail high temperature fan; 13. a kiln tail dust collector; 14. a kiln tail preheater; 15. an outlet descending air pipe; 16. a kiln head and tail exhaust fan; 17. a radiant heat exchanger device; 18. tail exhaust bypass valve; 19. a circulating air duct; 20. a high temperature wind regulating valve; 21. a cooling air regulating valve; 22. a high temperature blower; 23. and a grate cooler cooling blast circulation recycling system.
A. SP boiler water supply pipeline; b. SP boiler low pressure steam pipeline; c. a low pressure reheat steam line; c1, AQC low-pressure steam pipelines; c2, SP low-pressure steam pipelines; c3, a low-pressure steam inlet parent pipeline of the steam turbine; d. a main steam inlet pipeline of the steam turbine; m, circulating cooling water inlet; n, a circulating cooling water outlet; g. AQC boiler water supply pipeline; f. a high-pressure cylinder exhaust pipeline; p, to a clinker warehouse; q to the original raw material conveying system;
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 2 of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 2, the method for comprehensively utilizing the waste heat of the cement kiln based on the one-time reheating technology comprises the following steps:
Step one, improving the existing cement kiln waste heat power generation system, connecting a waste heat coupling recycling structure and a low-pressure steam flow waste heat utilization structure on the existing cement kiln waste heat power generation system, wherein the waste heat coupling recycling structure comprises: the kiln cylinder radiation heat exchanger 17 is arranged on the rotary kiln 11 of the cement production line, the water inlet side of the kiln cylinder radiation heat exchanger 17 is connected with the water outlet pipeline of the water supply pump 8, the water outlet side of the kiln cylinder radiation heat exchanger 17 is connected with the AQC boiler water supply pipeline g, and the water outlet of the kiln cylinder radiation heat exchanger 17 enters the public hot water section of the AQC waste heat boiler 1 from the AQC boiler water supply pipeline. The kiln cylinder radiation heat exchanger 17 is only required to be of a structure disclosed in China patent number 2010206753420. The kiln cylinder radiation heat exchanger is laid outside the kiln cylinder, and the kiln cylinder radiation heat can be fully utilized on the premise of ensuring that kiln maintenance, cylinder scanning, kiln inner temperature and the like are not affected. The number of kiln cylinder radiant heat exchangers is about 1/2 of the total length of the rotary kiln. The heat demand of the normal production of the kiln production line is not affected, and the radiant heat waste heat on the surface of the kiln cylinder body can be fully utilized under the condition of reasonable arrangement.
A tail exhaust bypass valve 18 is arranged on an air outlet pipeline between the kiln head exhaust fan 16 and the kiln head chimney 0, a grate cooler cooling blast circulation recycling system 23 is connected between the tail exhaust bypass valve 18 and an air inlet of the kiln head grate cooler 10, the grate cooler cooling blast circulation recycling system 23 comprises a circulating air pipeline 19, one end of the circulating air pipeline is connected with one valve port of the tail exhaust bypass valve 18, the other end of the circulating air pipeline is connected with one ends of a plurality of circulating air branch pipes, and the other end of each circulating air branch pipe is respectively connected with a high-temperature air regulating valve 20, a high-temperature air blower 22 and the air inlet of the kiln head grate cooler in sequence; the number of the high-temperature blowers is calculated according to the cooling heat release amount required by ensuring the cooling effect of the quenching section and the tail clinker of the grate cooler, and the cooling heat release amount is equal to the product of the mass, specific heat capacity and cooling temperature difference of the clinker of the grate cooler; the cooling heat release amount generated by each high-temperature blower is equal to the product of the specific heat capacity of air and the air quantity (from the tail gas circulation of the kiln head grate cooler to recycle hot air) of each high-temperature blower and the temperature thereof; the number of the high-temperature blowers is obtained by dividing the cooling heat release amount by the cooling heat release amount of a single high-temperature blower. A cooling air regulating valve 21 is connected to the circulating air branch pipe at the air inlet of each high-temperature blower.
The improved low-pressure steam flow waste heat utilization structure is as follows: the AQC waste heat boiler 1 is added with a low-pressure steam reheating section between a high-pressure evaporator section and a high-pressure superheater section, an outlet of a high-pressure cylinder of a steam turbine is connected with one end of a high-pressure cylinder steam exhaust pipeline f, an outlet of the low-pressure superheater section of the AQC waste heat boiler 1 is connected with one end of a low-pressure superheater outlet pipeline, an SP waste heat boiler outlet is connected with one end of an SP waste heat boiler low-pressure steam pipeline b, the other end of the high-pressure cylinder steam exhaust pipeline f, the other end of the low-pressure superheater outlet pipeline and the other end of the SP waste heat boiler low-pressure steam pipeline b are connected with an inlet of a low-pressure reheating steam inlet pipeline, an outlet of the low-pressure reheating steam inlet pipeline is connected with an inlet of the low-pressure steam reheating section of the steam turbine, an outlet of the low-pressure reheating section of the low-pressure steam turbine is connected with an inlet of the low-pressure steam turbine low-pressure steam mother pipeline c3 through the low-pressure reheating steam pipeline c, and an outlet of the low-pressure steam turbine low-pressure mother pipeline c3 is connected with an inlet of the steam turbine low-pressure cylinder;
The existing low-pressure steam flow is as follows: the water discharged from the public hot water section of the AQC waste heat boiler 1 sequentially passes through a low-pressure evaporator and a low-pressure superheater, and low-pressure steam generated by the AQC low-pressure steam pipeline c1 and the SP waste heat boiler 2 is combined through the SP low-pressure steam pipeline c2 and then is fed into a low-pressure steam inlet of a steam turbine through a low-pressure steam parent pipeline c3 of the steam turbine. The prior art device of fig. 1 is removed: AQC low-pressure steam pipeline c1 between AQC exhaust-heat boiler low pressure superheater export and steam turbine low pressure steam inlet, SP low-pressure steam pipeline c2 between SP exhaust-heat boiler low pressure superheater export and steam turbine low pressure steam inlet.
Step two, carrying out comprehensive utilization of waste heat, wherein the specific process is as follows:
The waste heat coupling recycling process comprises the following steps: the waste heat boiler water at the outlet of the water feeding pump 8 enters the kiln cylinder radiation heat exchanger 17 to exchange heat with the radiation heat in the kiln cylinder radiation heat exchanger, the temperature of the waste heat boiler water is increased to 55-65 ℃ after heat exchange (for example, the temperature can be 55 ℃, 60 ℃ and 65 ℃), the waste heat boiler water is fed to the inlet of a public hot water section of the AQC waste heat boiler by the AQC boiler water feeding pipeline g, and meanwhile, the smoke discharged from the tail end of the AQC waste heat boiler at the temperature of 100-130 ℃ (for example, the temperature can be 100 ℃, 120 ℃ and 130 ℃) sequentially passes through the kiln head dust collector 9, the kiln head exhaust fan 16, the high-temperature air regulating valve 20, the high-temperature blower 22, the grate cooler air inlet and the grate cooler air outlet and then enters the AQC waste heat boiler to exchange heat, wherein the temperature of the smoke discharged from the grate cooler air outlet is 250-350 ℃ (for example, the temperature can be 250 ℃, 300 ℃ and 350 ℃), and the generated steam quantity is increased due to the increase of the effective absorption and utilization of the smoke heat, so that the power of the waste heat power generation system is increased.
The low-pressure steam waste heat utilization flow is as follows: the steam exhausted from the high-pressure cylinder of the steam turbine with the pressure between 0.3 and 0.5MPa (such as 0.3MPa, 0.4MPa and 0.5 MPa) flows into the high-pressure cylinder exhaust pipeline f, the low-pressure steam with the pressure between 0.3 and 0.5MPa flowing out of the outlet of the SP waste heat boiler flows into the SP boiler low-pressure steam pipeline b, the low-pressure steam with the pressure between 0.3 and 0.5MPa generated by the low-pressure superheater section of the AQC waste heat boiler flows into the low-pressure superheater section steam pipeline, and the low-pressure steam flowing out of the high-pressure cylinder exhaust pipeline f, the SP boiler low-pressure steam pipeline b and the low-pressure superheater section steam pipeline are merged and then jointly enter the low-pressure steam reheating section of the AQC waste heat boiler 1 to enable the temperature of the low-pressure steam to be increased by 20 to 30 ℃, and then sequentially enter the steam inlet of the steam turbine through the low-pressure steam reheating section outlet, the low-pressure steam pipeline c and the low-pressure steam pipeline c1. Therefore, the superheat degree of low-pressure steam can be improved, the function of a steam turbine is improved, the reheated low-pressure steam with a higher enthalpy value and the pressure of 0.3-0.5MPa is sent to a low-pressure cylinder of the steam turbine to continuously do work, and the thermoelectric conversion efficiency of the system can be effectively improved because the high-pressure steam and the low-pressure steam have higher superheat degree and work-doing capability.
The technological process and control parameters which are not mentioned in the method of the invention only need to adopt the existing structure, connection mode and control parameters.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A cement kiln waste heat comprehensive utilization method based on a primary reheating technology is characterized by comprising the following steps:
The method comprises the steps that firstly, a waste heat coupling recycling structure and a low-pressure steam flow waste heat utilization structure are connected to a cement kiln waste heat power generation system, the waste heat coupling recycling structure comprises a kiln cylinder radiation heat exchanger (17) arranged on a rotary kiln (11) of a cement production line, the water inlet side of the kiln cylinder radiation heat exchanger is connected with a water outlet pipeline of a water supply pump (8), the water outlet side of the kiln cylinder radiation heat exchanger is connected with an AQC boiler water supply pipeline (g), and water discharged from the kiln cylinder radiation heat exchanger enters a public hot water section of an AQC waste heat boiler (1) from the AQC boiler water supply pipeline;
A tail exhaust bypass valve (18) is arranged on an air outlet pipeline between a kiln head exhaust fan (16) and a kiln head chimney (0), a grate cooler cooling blast circulation recycling system is connected between the tail exhaust bypass valve and an air inlet of a kiln head grate cooler (10), the grate cooler cooling blast circulation recycling system (23) comprises a circulating air pipeline (19) with one end connected with one valve port of the tail exhaust bypass valve and the other end connected with one ends of a plurality of circulating air branch pipes, and the other end of each circulating air branch pipe is respectively connected with a high-temperature air regulating valve (20), a high-temperature air blower (22) and the air inlet of the kiln head grate cooler in sequence; a cooling air regulating valve (21) is connected to a circulating air branch pipe at the air inlet of each high-temperature blower;
The low-pressure steam flow waste heat utilization structure comprises: a low-pressure steam reheating section is additionally arranged between a high-pressure evaporator section and a high-pressure superheater section of an AQC waste heat boiler (1), an outlet of a high-pressure cylinder of a steam turbine is connected with one end of a high-pressure cylinder steam exhaust pipeline (f), an outlet of the low-pressure superheater section of the AQC waste heat boiler is connected with one end of a low-pressure superheater outlet pipeline, an outlet of an SP waste heat boiler is connected with one end of an SP waste heat boiler low-pressure steam pipeline (b), the other end of the high-pressure cylinder steam exhaust pipeline (f), the other end of the low-pressure superheater outlet pipeline and the other end of the SP waste heat boiler low-pressure steam pipeline are connected with an inlet of a low-pressure reheating steam inlet pipeline together, an outlet of the low-pressure reheating steam inlet pipeline is connected with an inlet of the low-pressure steam reheating section, and an outlet of the low-pressure reheating section of the low-pressure steam turbine is connected with an inlet of a low-pressure steam turbine low-pressure steam parent pipeline (c 3) through a low-pressure reheating steam pipeline (c);
Step two, carrying out comprehensive utilization of waste heat, wherein the specific process is as follows:
The operation process of the waste heat coupling recycling structure is as follows: the waste heat boiler water at the outlet of the water supply pump enters a kiln cylinder radiation heat exchanger to exchange heat with radiation heat in the kiln cylinder radiation heat exchanger, the temperature of the waste heat boiler water supply after heat exchange is increased to 55-65 ℃, the waste heat boiler water supply is sent to the inlet of a public hot water section of the AQC waste heat boiler by an AQC boiler water supply pipeline, and meanwhile, flue gas with the temperature of 100-130 ℃ discharged from the tail end of the AQC waste heat boiler sequentially passes through a kiln head dust collector (9), a kiln head exhaust fan (16), a high temperature air adjusting valve (20), a high temperature air blower (22), a grate cooler air inlet and a grate cooler air outlet and then enters the AQC waste heat boiler to exchange heat of gas and water, wherein the temperature of the flue gas discharged from the grate cooler air outlet is 250-350 ℃;
the operation process of the low-pressure steam flow waste heat utilization structure is as follows: the steam turbine high-pressure cylinder exhaust steam with the pressure of 0.3-0.5 MPa flows into a high-pressure cylinder exhaust steam pipeline (f), the low-pressure steam with the pressure of 0.3-0.5 MPa flowing out of an outlet of the SP waste heat boiler flows into a SP boiler low-pressure steam pipeline (b), the low-pressure steam with the pressure of 0.3-0.5 MPa generated by a low-pressure superheater section of the AQC waste heat boiler flows into a low-pressure superheater section steam pipeline, and the low-pressure steam flowing out of the high-pressure cylinder exhaust steam pipeline (f), the SP boiler low-pressure steam pipeline (b) and the low-pressure superheater section steam pipeline are converged and then jointly enter a low-pressure steam reheating section of the AQC waste heat boiler to enable the temperature of the low-pressure steam to be increased by 20-30 ℃, and then sequentially enter a steam turbine low-pressure steam inlet through a low-pressure steam reheating section outlet, the low-pressure steam pipeline and the AQC low-pressure steam pipeline.
2. The comprehensive utilization method of cement kiln waste heat based on the single reheating technology according to claim 1, which is characterized by comprising the following steps: the number of the kiln cylinder radiation heat exchangers is 1/2 of the total length of the rotary kiln.
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