WO2023197451A1 - 燃煤机组蒸汽加热熔盐的储放热系统 - Google Patents
燃煤机组蒸汽加热熔盐的储放热系统 Download PDFInfo
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- WO2023197451A1 WO2023197451A1 PCT/CN2022/101599 CN2022101599W WO2023197451A1 WO 2023197451 A1 WO2023197451 A1 WO 2023197451A1 CN 2022101599 W CN2022101599 W CN 2022101599W WO 2023197451 A1 WO2023197451 A1 WO 2023197451A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- the present disclosure relates to the technical field of coal-fired power generation, and specifically relates to a heat storage and release system for steam heating molten salt of a coal-fired unit.
- thermal power plants Due to the different electricity demand, the power generation of thermal power plants cannot completely match the electricity demand, resulting in insufficient or excessive power. Therefore, some thermal power plants use molten salt energy storage for peak and frequency regulation.
- the present disclosure aims to solve one of the technical problems in the related art, at least to a certain extent.
- the purpose of the present disclosure is to provide a heat storage and release system for steam heating molten salt of a coal-fired unit.
- the heat storage and release system includes: a first heat exchanger, a boiler, a high-pressure cylinder, a liquid feed pump, a third A valve, a boost pump and a molten salt heat storage and release device.
- the first heat exchanger includes: a first passage and a second passage for heat exchange; wherein the first steam outlet end of the boiler is connected to the first passage respectively.
- the steam inlet end of the high-pressure cylinder is connected to one end of the first passage, and the first steam inlet end of the boiler is connected to the liquid outlet end of the liquid feed pump and the other end of the first passage respectively;
- the first valve is arranged between the first steam outlet end of the boiler and the steam inlet end of the high-pressure cylinder.
- the first valve is used to increase the steam outlet pressure of the first steam outlet end of the boiler.
- the boost pump It is provided between the first steam inlet end of the boiler and the first passage; the molten salt heat storage and release device is connected to the second passage of the first heat exchanger.
- the molten salt heat storage and release device includes: a cryogenic tank, the liquid outlet end and the liquid inlet end of the cryogenic tank are respectively connected to one end of the second passage, and the cryogenic tank is filled with Molten salt; a high-temperature tank, the liquid outlet end and the liquid inlet end of the high-temperature tank are respectively connected to the other end of the second passage; the high-temperature tank is filled with molten salt; a second valve, the second valve A third valve is provided between the liquid outlet end of the cryogenic tank and the second passage; a third valve is provided between the liquid inlet end of the cryogenic tank and the second passage; a fourth valve , the fourth valve is arranged between the liquid outlet end of the high temperature tank and the second passage; the fifth valve, the fifth valve is arranged between the liquid inlet end of the high temperature tank and is connected to the second passage between.
- the molten salt heat storage and release device further includes: a cryogenic pump disposed between the liquid outlet end of the cryogenic tank and the second passage; a high temperature pump, the high temperature pump The pump is arranged between the liquid outlet end of the high temperature tank and the second passage.
- the heat storage and release system further includes: a medium-pressure cylinder, the steam inlet end of the medium-pressure cylinder is connected to the second steam outlet end of the boiler, and the steam outlet end of the high-pressure cylinder is connected to the second steam outlet end of the boiler.
- the second steam inlet end of the boiler is connected; a low-pressure cylinder, the first steam inlet end of the low-pressure cylinder is connected with the first steam outlet end of the medium-pressure cylinder; a second heat exchanger, the second heat exchanger It includes: a third passage and a fourth passage for heat exchange.
- One end of the third passage is connected to the second steam outlet end of the medium-pressure cylinder, and the other end of the third passage is connected to the high-pressure cylinder respectively.
- the steam outlet end of the low-pressure cylinder is connected to the second steam inlet end of the low-pressure cylinder, and the fourth passage is provided between the high-temperature tank and the second passage; a sixth valve is provided at the The third passage is connected to the steam outlet end of the high-pressure cylinder; and a seventh valve is provided between the third passage and the second steam inlet end of the low-pressure cylinder.
- the heat storage and release system further includes: an eighth valve, the eighth valve is provided between the steam inlet end of the medium-pressure cylinder and the second steam outlet end of the boiler; a ninth valve , the ninth valve is arranged between the steam outlet end of the high-pressure cylinder and the second steam inlet end of the boiler; the tenth valve, the tenth valve is arranged between the third passage and the medium-pressure cylinder The second steam outlet end is connected between; an eleventh valve, the eleventh valve is arranged at an end of the third passage away from the medium-pressure cylinder.
- the molten salt heat storage and release device further includes: a first pipeline, one end of the first pipeline is connected to an end of the second passage close to the cryogenic tank; a second pipeline, One end of the second pipeline is connected to the fourth passage and the second passage, and the other end of the second pipeline is connected to the other end of the first pipeline; the third pipeline is One end of the third pipeline is connected to an end of the fourth passage close to the high-temperature tank, and the other end of the third pipeline is connected to the other end of the first pipeline; the twelfth valve, the A twelfth valve is provided on the first pipeline; a thirteenth valve, the thirteenth valve is provided on the second pipeline; a fourteenth valve, the fourteenth valve is provided on the third pipeline On the pipeline.
- a fourth pipeline and a fifth pipeline are provided between the first steam inlet end of the boiler and the first passage, and the boost pump is provided on the fourth pipeline;
- the heat storage and release system also includes: a fifteenth valve and a sixteenth valve, the fifteenth valve is arranged on the fourth pipeline, and the sixteenth valve is arranged on the fifth pipeline.
- the heat storage and release system further includes: a high-pressure heater, the liquid outlet end of the high-pressure heater is connected to the first steam inlet end of the boiler, and the liquid inlet ends of the high-pressure heater are respectively Connected to the liquid outlet end of the liquid feed pump and an end of the first passage away from the boiler, the boost pump is disposed between the liquid inlet end of the high-pressure heater and the first passage; Seventeenth valve, the seventeenth valve is arranged between the liquid outlet end of the high-pressure heater and the first steam inlet end of the boiler.
- the heat storage and release system further includes: a deaerator, the liquid outlet end of the deaerator is connected to the liquid inlet end of the liquid feed pump.
- the heat storage and release system further includes: an eighteenth valve, the eighteenth valve is provided between the first steam outlet end of the boiler and the first passage.
- the output of the liquid feed pump is increased, thereby effectively increasing the steam outlet pressure of the first steam outlet of the boiler while keeping the steam flow rate at the first steam outlet of the boiler.
- the steam outlet pressure at the first steam outlet end of the boiler can reach the rated pressure or maximum operating pressure, thereby effectively increasing the saturation temperature or critical temperature of the steam in the first passage, thereby increasing the maximum achievable temperature of molten salt or steam during the heat exchange process. temperature, improve the energy grade of steam during the heat release process of molten salt, and improve the thermal efficiency and economy of the heat storage and release system.
- Figure 1 is a schematic structural diagram of a heat storage and release system for steam heating molten salt of a coal-fired unit proposed by an embodiment of the present disclosure.
- Figure 2 is a schematic structural diagram of the coal-fired unit's steam-heated molten salt heat storage and release system proposed by an embodiment of the present disclosure when the coal-fired unit is in a deep peak-shaving period.
- Figure 3 is a schematic structural diagram of the coal-fired unit's steam-heated molten salt heat storage and release system proposed by an embodiment of the present disclosure when the coal-fired unit is in a non-deep peak-shaving period.
- First heat exchanger 2. Boiler, 3. High-pressure cylinder, 4. Liquid feed pump, 5. First valve, 6. Boost pump, 7. Low-temperature tank, 8. High-temperature tank, 9. Second valve , 10. The third valve, 11. The fourth valve, 12. The fifth valve, 13. Low temperature pump, 14. High temperature pump, 15. Medium pressure cylinder, 16. Low pressure cylinder, 17. Second heat exchanger, 18. The sixth valve, 19. The seventh valve, 20. The eighth valve, 21. The ninth valve, 22. The tenth valve, 23. The eleventh valve, 24. The first pipeline, 25. The second pipeline, 26 , The third pipeline, 27. The twelfth valve, 28. The thirteenth valve, 29. The fourteenth valve, 30. The fourth pipeline, 31. The fifth pipeline, 32. The fifteenth valve, 33. The sixteenth valve, 34. High pressure heater, 35. The seventeenth valve, 36. Deaerator, 37. The eighteenth valve.
- an embodiment of the present disclosure proposes a heat storage and release system for steam heating molten salt in coal-fired units.
- the heat storage and release system includes a first heat exchanger 1, a boiler 2, a high-pressure cylinder 3, and a liquid feed pump 4 , the first valve 5, the boost pump 6 and the molten salt heat storage and release device.
- the first heat exchanger 1 includes a first passage and a second passage for heat exchange;
- the first steam outlet end of the boiler 2 is connected to the steam inlet end of the high-pressure cylinder 3 and one end of the first passage respectively.
- the first steam inlet end of the boiler 2 is respectively connected to the liquid outlet end of the liquid feed pump 4 and the first passage end.
- the other end is connected, and the first valve 5 is installed between the first steam outlet end of the boiler 2 and the steam inlet end of the high-pressure cylinder 3.
- the first valve 5 is used to increase the steam outlet pressure of the first steam outlet end of the boiler 2.
- the boost pump 6 Disposed between the first steam inlet end of the boiler 2 and the first passage, the molten salt heat storage and release device is connected to the second passage of the first heat exchanger 1 .
- the liquid feed pump 4 delivers the liquid to the first steam inlet end of the boiler 2, and the combustion of the boiler 2 heats the liquid and converts it into steam.
- the steam is transported from the first steam outlet end of the boiler 2 into the high-pressure cylinder 3 Produce work and generate electricity;
- the output of the liquid feeding pump 4 is increased, thereby effectively increasing the first steam outlet of the boiler 2 under the premise that the steam flow rate at the first steam outlet of the boiler 2 remains unchanged.
- the steam outlet pressure at the first steam outlet of the boiler 2 can reach the rated pressure or the maximum operating pressure, thereby effectively increasing the saturation temperature or critical temperature of the steam in the first passage, thereby increasing the melting temperature during the heat exchange process.
- the maximum temperature that salt or steam can achieve improves the energy grade of steam during the heat release process of molten salt, and improves the thermal efficiency and economy of the heat storage and release system.
- the liquid in the heat storage and release system may be water, and the steam may be water vapor.
- the molten salt heat storage and release device includes a low-temperature tank 7, a high-temperature tank 8, a second valve 9, a third valve 10, a fourth valve 11 and a fifth valve 12.
- the low-temperature tank 7 The liquid outlet end and the liquid inlet end of the high temperature tank 8 are respectively connected to one end of the second passage.
- the low temperature tank 7 is filled with molten salt.
- the liquid outlet end and the liquid inlet end of the high temperature tank 8 are respectively connected to the other end of the second passage.
- the high temperature tank 7 is filled with molten salt.
- the second valve 9 is arranged between the liquid outlet end of the cryogenic tank 7 and the second passage
- the third valve 10 is arranged between the liquid inlet end of the cryogenic tank 7 and the second passage
- the fourth The valve 11 is disposed between the liquid outlet end of the high temperature tank 8 and the second passage
- the fifth valve 12 is disposed between the liquid inlet end of the high temperature tank 8 and the second passage.
- the molten salt heat storage and release device also includes a cryogenic pump 13 and a high temperature pump 14.
- the cryogenic pump 13 is provided between the liquid outlet end of the cryogenic tank 7 and the second passage.
- the high temperature pump 14 is provided between the liquid outlet end of the high temperature tank 8 and the second passage.
- the heat storage and release system also includes a medium-pressure cylinder 15, a low-pressure cylinder 16, a second heat exchanger 17, a sixth valve 18 and a seventh valve 19.
- the inlet of the medium-pressure cylinder 15 The steam end is connected to the second steam outlet end of the boiler 2, the steam outlet end of the high-pressure cylinder 3 is connected to the second steam inlet end of the boiler 2, and the first steam inlet end of the low-pressure cylinder 16 is connected to the first steam outlet of the medium-pressure cylinder 15.
- the second heat exchanger 17 includes a third passage and a fourth passage for heat exchange.
- One end of the third passage is connected to the second steam outlet end of the medium-pressure cylinder 15, and the other end of the third passage is connected to the high-pressure cylinder 15.
- the steam outlet end of the cylinder 3 is connected to the second steam inlet end of the low-pressure cylinder 16.
- the fourth passage is arranged between the high-temperature tank 8 and the second passage.
- the sixth valve 18 is arranged between the third passage and the steam outlet end of the high-pressure cylinder 3.
- the seventh valve 19 is provided between the third passage and the second steam inlet end of the low-pressure cylinder 16 .
- the steam in the high-pressure cylinder 3 generates power and then enters the second steam inlet end of the boiler 2.
- the steam is reheated by the boiler 2 and then enters the medium-pressure cylinder 15 from the second steam outlet end of the boiler 2.
- the steam in the intermediate-pressure cylinder 15 generates power and then flows from the first steam outlet end of the intermediate-pressure cylinder 15 into the first steam inlet end of the low-pressure cylinder 16 to continue generating power;
- the heat storage and release system also includes an eighth valve 20, a ninth valve 21, a tenth valve 22 and an eleventh valve 23.
- the eighth valve 20 is provided at the inlet of the medium pressure cylinder 15.
- the ninth valve 21 is arranged between the steam outlet end of the high-pressure cylinder 3 and the second steam inlet end of the boiler 2
- the tenth valve 22 is arranged between the third passage and the medium pressure
- the second steam outlet end of the cylinder 15 is connected, and the eleventh valve 23 is provided at an end of the third passage away from the medium-pressure cylinder 15 .
- the eighth valve 20 by adjusting the eighth valve 20, the ninth valve 21, the tenth valve 22 and the eleventh valve 23, the amount of steam entering the third passage can be controlled, thereby adjusting the medium pressure cylinder 15 to use the molten salt heat storage and release device to generate electricity. of power generation.
- the molten salt heat storage and release device also includes a first pipeline 24, a second pipeline 25, a third pipeline 26, a twelfth valve 27, a thirteenth valve 28 and In the fourteenth valve 29, one end of the first pipeline 24 is connected to an end of the second channel close to the cryogenic tank 7, and one end of the second pipeline 25 is connected to the fourth channel and the second channel.
- the second pipeline 25 The other end of the third pipeline 26 is connected to the other end of the first pipeline 24.
- One end of the third pipeline 26 is connected to the end of the fourth passage close to the high temperature tank 8.
- the other end of the third pipeline 26 is connected to the other end of the first pipeline 24.
- the twelfth valve 27 is arranged on the first pipeline 24
- the thirteenth valve 28 is arranged on the second pipeline 25
- the fourteenth valve 29 is arranged on the third pipeline 26 .
- part of the molten salt can be circulated between the low temperature tank 7 and the high temperature tank 8 without passing through the second passage and the fourth passage.
- the openings of the twelfth valve 27, the thirteenth valve 28 and the fourteenth valve 29 the flow control of the molten salt in the second channel and the fourth channel is realized, thereby adjusting the temperature of the molten salt, Effectively improve the overall flexibility.
- the twelfth valve 27 can be closed, and the opening degrees of the thirteenth valve 28 and the fourteenth valve 29 can be adjusted to control the heat exchange amount of the second heat exchanger 17 .
- the thirteenth valve 28 can be closed, and the openings of the twelfth valve 27 and the fourteenth valve 29 can be adjusted to adjust the heat exchange between the first heat exchanger 1 and the second heat exchanger 17 quantity.
- the fourteenth valve 29 can be closed, and the opening of the twelfth valve 27 and the thirteenth valve 28 can be adjusted to adjust the heat exchange amount of the first heat exchanger 1 .
- a fourth pipe 30 and a fifth pipe 31 are provided between the first steam inlet end of the boiler 2 and the first passage, and the boost pump 6 is provided in the fourth pipe.
- the heat storage and release system also includes a fifteenth valve 32 and a sixteenth valve 33.
- the fifteenth valve 32 is arranged on the fourth pipeline 30, and the sixteenth valve 33 is arranged on the fifth pipeline 31.
- the heat storage and release system also includes a high-pressure heater 34 and a seventeenth valve 35.
- the liquid outlet end of the high-pressure heater 34 is connected to the first steam inlet end of the boiler 2.
- the high-pressure heating The liquid inlet end of the heater 34 is connected to the liquid outlet end of the liquid feed pump 4 and the end of the first passage away from the boiler 2.
- the boost pump 6 is arranged between the liquid inlet end of the high-pressure heater 34 and the first passage.
- Seventeen valves 35 are arranged between the liquid outlet end of the high-pressure heater 34 and the first steam inlet end of the boiler 2 .
- the heat storage and release system also includes a deaerator 36 , and the liquid outlet end of the deaerator 36 is connected to the liquid inlet end of the liquid feed pump 4 .
- the liquid inlet to the liquid inlet end of the deaerator 36 may come from the steam outlet of the medium-pressure cylinder 15 , the steam outlet of the low-pressure cylinder 16 , and the condensate of the low-pressure cylinder 16 .
- the steam outlet end of the high-pressure heater 34 is connected to the liquid inlet end of the deaerator 36 , and the steam inlet at the steam inlet end of the high-pressure heater 34 can come from the high-pressure cylinder 3 and the medium-pressure cylinder 15 .
- the heat storage and release system also includes an eighteenth valve 37.
- the eighteenth valve 37 is provided between the first steam outlet end of the boiler 2 and the first passage.
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Abstract
提出了一种燃煤机组蒸汽加热熔盐的储放热系统。所述储放热系统包括:第一换热器、锅炉、高压缸、给液泵、第一阀门、升压泵和熔盐储放热装置,第一换热器包括:用于换热的第一通路和第二通路;其中,锅炉的第一出汽端分别与高压缸的进汽端及第一通路的一端相连,锅炉的第一进汽端分别与给液泵的出液端及第一通路的另一端相连;第一阀门设置在锅炉第一出汽端与高压缸进汽端相连之间,第一阀门用于提高锅炉第一出汽端的出汽压力;升压泵设置在锅炉的第一进汽端与第一通路相连之间;熔盐储放热装置与第一换热器的第二通路相连。
Description
相关申请的交叉引用
本申请要求在2022年4月15日在中国提交的中国专利申请号202210399647.0的优先权,其全部内容通过引用并入本文。
本公开涉及燃煤发电技术领域,具体涉及一种燃煤机组蒸汽加热熔盐的储放热系统。
由于用电需求的不同,使得火电厂的发电量无法完全匹配用电需求,导致电量不足或电量过盛,因此部分火电厂通过熔盐储能进行调峰调频。
在需要深度调峰时段,若直接抽取部分主再热蒸汽的热量进行储存,在不利用其潜热的情况下所需要的主蒸汽量巨大,影响系统安全稳定运行;若利用主蒸汽的潜热热量,受制于深度调峰负荷下主蒸汽压力的降低,对应的饱和温度偏低,即有大量热量释放在低品位温度区间,使蒸汽和熔盐之间的换热无法避免夹点问题,导致熔盐无法被加热至较高的温度,进而大幅度降低放热过程可将蒸汽加热到的能量品位,使得储放热系统的热效率较低,且经济性较差。
发明内容
本公开旨在至少在一定程度上解决相关技术中的技术问题之一。
为此,本公开的目的在于提供一种燃煤机组蒸汽加热熔盐的储放热系统。
为达到上述目的,本公开的实施例提供一种燃煤机组蒸汽加热熔盐的储放热系统,所述储放热系统包括:第一换热器、锅炉、高压缸、给液泵、第一阀门、升压泵和熔盐储放热装置,所述第一换热器包括:用于换热的第一通路和第二通路;其中,所述锅炉的第一出汽端分别与所述高压缸的进汽端及所述第一通路的一端相连,所述锅炉的第一进汽端分别与所述给液泵的出液端及所述第一通路的另一端相连;所述第一阀门设置在所述锅炉第一出汽端与所述高压缸进汽端相连之间,所述第一阀门用于提高所述锅炉第一出汽端的出汽压力,所述升压泵设置在所述锅炉的第一进汽端与所述第一通路相连之间;所述熔盐储放热装置与所述第一换热器的第二通路相连。
在一些实施方案中,所述熔盐储放热装置包括:低温罐,所述低温罐的出液端及进液 端分别与所述第二通路的一端相连,所述低温罐内灌装有熔盐;高温罐,所述高温罐的出液端及进液端分别与所述第二通路的另一端相连,所述高温罐内灌装有熔盐;第二阀门,所述第二阀门设置在所述低温罐出液端与所述第二通路相连之间;第三阀门,所述第三阀门设置在所述低温罐进液端与所述第二通路相连之间;第四阀门,所述第四阀门设置在所述高温罐出液端与所述第二通路相连之间;第五阀门,所述第五阀门设置在所述高温罐进液端与所述第二通路相连之间。
在一些实施方案中,所述熔盐储放热装置还包括:低温泵,所述低温泵设置在所述低温罐的出液端与所述第二通路相连之间;高温泵,所述高温泵设置在所述高温罐的出液端与所述第二通路相连之间。
在一些实施方案中,所述储放热系统还包括:中压缸,所述中压缸的进汽端与所述锅炉的第二出汽端相连,所述高压缸的出汽端与所述锅炉的第二进汽端相连;低压缸,所述低压缸的第一进汽端与所述中压缸的第一出汽端相连;第二换热器,所述第二换热器包括:用于换热的第三通路和第四通路,所述第三通路的一端与所述中压缸的第二出汽端相连,所述第三通路的另一端分别与所述高压缸的出汽端及所述低压缸的第二进汽端相连,所述第四通路设置在所述高温罐与所述第二通路相连之间;第六阀门,所述第六阀门设置在所述第三通路与所述高压缸出汽端相连之间;第七阀门,所述第七阀门设置在所述第三通路与所述低压缸第二进汽端相连之间。
在一些实施方案中,所述储放热系统还包括:第八阀门,所述第八阀门设置在所述中压缸进汽端与所述锅炉第二出汽端相连之间;第九阀门,所述第九阀门设置在所述高压缸出汽端与所述锅炉第二进汽端相连之间;第十阀门,所述第十阀门设置在所述第三通路与所述中压缸第二出汽端相连之间;第十一阀门,所述第十一阀门设置在所述第三通路远离所述中压缸的一端。
在一些实施方案中,所述熔盐储放热装置还包括:第一管路,所述第一管路的一端与所述第二通路靠近所述低温罐的一端相连;第二管路,所述第二管路的一端与所述第四通路和第二通路相连之间相连,所述第二管路的另一端与所述第一管路的另一端相连;第三管路,所述第三管路的一端与所述第四通路靠近所述高温罐的一端相连,所述第三管路的另一端与所述第一管路的另一端相连;第十二阀门,所述第十二阀门设置在所述第一管路上;第十三阀门,所述第十三阀门设置在所述第二管路上;第十四阀门,所述第十四阀门设置在所述第三管路上。
在一些实施方案中,所述锅炉的第一进汽端与所述第一通路相连之间设置有第四管路和第五管路,所述升压泵设置在所述第四管路上;所述储放热系统还包括:第十五阀门和第十六阀门,所述第十五阀门设置在所述第四管路上,所述第十六阀门设置在所述第五管 路上。
在一些实施方案中,所述储放热系统还包括:高压加热器,所述高压加热器的出液端与所述锅炉的第一进汽端相连,所述高压加热器的进液端分别与所述给液泵的出液端及所述第一通路远离所述锅炉的一端相连,所述升压泵设置在所述高压加热器的进液端与所述第一通路相连之间;第十七阀门,所述第十七阀门设置在所述高压加热器出液端与所述锅炉第一进汽端相连之间。
在一些实施方案中,所述储放热系统还包括:除氧器,所述除氧器的出液端与所述给液泵的进液端相连。
在一些实施方案中,所述储放热系统还包括:第十八阀门,所述第十八阀门设置在所述锅炉第一出汽端与所述第一通路相连之间。
本公开实施例提供的技术方案可以包括以下有益效果:
通过减小第一阀门的开度,使给液泵的出力得到提升,从而在锅炉第一出汽端出汽流量不变的前提下,有效提高了锅炉第一出汽端的出汽压力,使锅炉第一出汽端的出汽压力能够达到额定压力或最大运行压力,从而有效地提高第一通路内蒸汽的饱和温度或临界温度,进而在换热过程中,提高熔盐或蒸汽可实现的最高温度,提高熔盐放热过程中蒸汽的能量品位,改善储放热系统的热效率和经济性。
本公开附加的方面和优点将在下面的描述中部分给出,部分将从下面的描述中变得明显,或通过本公开的实践了解到。
本公开上述的和/或附加的方面和优点从下面结合附图对实施例的描述中将变得明显和容易理解,其中:
图1是本公开一实施例提出的燃煤机组蒸汽加热熔盐的储放热系统的结构示意图。
图2是本公开一实施例提出的燃煤机组蒸汽加热熔盐的储放热系统中燃煤机组处于深度调峰时段时的结构示意图。
图3是本公开一实施例提出的燃煤机组蒸汽加热熔盐的储放热系统中燃煤机组处于非深度调峰时段时的结构示意图。
附图标记:
1、第一换热器,2、锅炉,3、高压缸,4、给液泵,5、第一阀门,6、升压泵,7、低温罐,8、高温罐,9、第二阀门,10、第三阀门,11、第四阀门,12、第五阀门,13、低温泵,14、高温泵,15、中压缸,16、低压缸,17、第二换热器,18、第六阀门,19、第七阀门,20、第八阀门,21、第九阀门,22、第十阀门,23、第十一阀门,24、第一管路, 25、第二管路,26、第三管路,27、第十二阀门,28、第十三阀门,29、第十四阀门,30、第四管路,31、第五管路,32、第十五阀门,33、第十六阀门,34、高压加热器,35、第十七阀门,36、除氧器,37、第十八阀门。
下面详细描述本公开的实施例,所述实施例的示例在附图中示出,其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的,仅用于解释本公开,而不能理解为对本公开的限制。相反,本公开的实施例包括落入所附加权利要求书的精神和内涵范围内的所有变化、修改和等同物。
如图1所示,本公开的实施例提出一种燃煤机组蒸汽加热熔盐的储放热系统,储放热系统包括第一换热器1、锅炉2、高压缸3、给液泵4、第一阀门5、升压泵6和熔盐储放热装置,第一换热器1包括用于换热的第一通路和第二通路;
其中,锅炉2的第一出汽端分别与高压缸3的进汽端及第一通路的一端相连,锅炉2的第一进汽端分别与给液泵4的出液端及第一通路的另一端相连,第一阀门5设置在锅炉2第一出汽端与高压缸3进汽端相连之间,第一阀门5用于提高锅炉2第一出汽端的出汽压力,升压泵6设置在锅炉2的第一进汽端与第一通路相连之间,熔盐储放热装置与第一换热器1的第二通路相连。
可以理解的是,给液泵4将液体输送到锅炉2的第一进汽端,锅炉2燃烧使该液体加热并转换为蒸汽,蒸汽由锅炉2的第一出汽端输送到高压缸3内做功发电;
如图2所示,在用电量较少时,燃煤机组处于深度调峰时段,由于需要保证锅炉2的稳燃,使得锅炉2的第一出汽端具有大量蒸汽进入高压缸3,因此减小第一阀门5的开度,并开启升压泵6,使锅炉2内本应进入高压缸3的大部分蒸汽进入到第一通路内,以使第一通路与第二通路换热,实现熔盐储放热装置的储热,且不影响燃煤机组的稳定运行,同时,第一通路内放热后的蒸汽转换为液体并经升压泵6升压后与给液泵4的出液一同进入到锅炉2的第一进汽端,从而循环使用;
如图3所示,在用电量较大时,燃煤机组处于非深度调峰时段,将第一阀门5完全开启,且关闭升压泵6,由于失去升压泵6的升压输送,使得给液泵4的部分出液进入到第一通路内,以使第一通路与第二通路换热,实现熔盐储放热装置的放热,同时,第一通路内吸热后的液体转换为蒸汽与锅炉2第一出汽端的出汽一同进入高压缸3内做功发电,从而有效提高燃煤机组的发电效率,满足较大的用电需求。
其中,通过减小第一阀门5的开度,使给液泵4的出力得到提升,从而在锅炉2第一出汽端出汽流量不变的前提下,有效提高了锅炉2第一出汽端的出汽压力,使锅炉2第一 出汽端的出汽压力能够达到额定压力或最大运行压力,从而有效地提高第一通路内蒸汽的饱和温度或临界温度,进而在换热过程中,提高熔盐或蒸汽可实现的最高温度,提高熔盐放热过程中蒸汽的能量品位,改善储放热系统的热效率和经济性。
需要说明的是,蒸汽的压力与其温度呈正比,即:蒸汽的压力越大,则温度越高,反之,蒸汽的压力越小,则温度越低。
在一些实施例中,储放热系统内的液体可为水,而蒸汽则为水蒸汽。
如图1所示,在一些实施例中,熔盐储放热装置包括低温罐7、高温罐8、第二阀门9、第三阀门10、第四阀门11和第五阀门12,低温罐7的出液端及进液端分别与第二通路的一端相连,低温罐7内灌装有熔盐,高温罐8的出液端及进液端分别与第二通路的另一端相连,高温罐8内灌装有熔盐,第二阀门9设置在低温罐7出液端与第二通路相连之间,第三阀门10设置在低温罐7进液端与第二通路相连之间,第四阀门11设置在高温罐8出液端与第二通路相连之间,第五阀门12设置在高温罐8进液端与第二通路相连之间。
可以理解的是,如图2所示,燃煤机组处于深度调峰时段时,将第二阀门9和第五阀门12开启,第三阀门10和第四阀门11关闭,从而使低温罐7内的熔盐经过第二通路流向高温罐8内,且在熔盐经过第二通路时被第一通路内的蒸汽加热,实现熔盐储放热装置的储热;
如图3所示,燃煤机组处于非深度调峰时段时,将第二阀门9和第五阀门12关闭,第三阀门10和第四阀门11开启,从而使高温罐8内的熔盐经过第二通路流向低温罐7内,且在熔盐经过第二通路时将第一通路内的液体加热成蒸汽,实现熔盐储放热装置的放热。
如图1所示,在一些实施例中,熔盐储放热装置还包括低温泵13和高温泵14,低温泵13设置在低温罐7的出液端与第二通路相连之间,高温泵14设置在高温罐8的出液端与第二通路相连之间。
可以理解的是,如图2所示,燃煤机组处于深度调峰时段时,将低温泵13开启,高温泵14关闭,使低温泵13将低温罐7内的熔盐增压后输送到高温罐8内,保证第一通路内蒸汽对第二通路内熔盐的高效加热;
如图3所示,燃煤机组处于非深度调峰时段时,将低温泵13关闭,高温泵14开启,使高温泵14将高温罐8内的熔盐增压后输送到低温罐7内,保证第二通路内熔盐对第一通路内液体的高效加热。
如图1所示,在一些实施例中,储放热系统还包括中压缸15、低压缸16、第二换热器17、第六阀门18和第七阀门19,中压缸15的进汽端与锅炉2的第二出汽端相连,高压缸3的出汽端与锅炉2的第二进汽端相连,低压缸16的第一进汽端与中压缸15的第一出汽端相连,第二换热器17包括用于换热的第三通路和第四通路,第三通路的一端与中压缸 15的第二出汽端相连,第三通路的另一端分别与高压缸3的出汽端及低压缸16的第二进汽端相连,第四通路设置在高温罐8与第二通路相连之间,第六阀门18设置在第三通路与高压缸3出汽端相连之间,第七阀门19设置在第三通路与低压缸16第二进汽端相连之间。
可以理解的是,高压缸3内的蒸汽做功发电后进入到锅炉2的第二进汽端,该蒸汽经过锅炉2再次加热后由锅炉2的第二出汽端进入到中压缸15内继续做功发电,中压缸15内的蒸汽做功发电后由中压缸15的第一出汽端进入低压缸16的第一进汽端继续做功发电;
如图2所示,在用电量较少时,燃煤机组处于深度调峰时段,将第六阀门18关闭,第七阀门19开启,使中压缸15内的部分蒸汽做功发电后由中压缸15的第二出汽端进入第三通路内,以使第三通路与第四通路换热,实现熔盐储放热装置的储热,且不影响燃煤机组的稳定运行,同时,第三通路内放热后的蒸汽进入到低压缸16的第二进汽端继续做功发电;
如图3所示,在用电量较大时,燃煤机组处于非深度调峰时段,将第六阀门18开启,第七阀门19关闭,使高压缸3内的部分蒸汽做功发电后由高压缸3的出汽端进入到第三通路内,以使第三通路与第四通路换热,实现熔盐储放热装置的放热,同时,第三通路内加热后的蒸汽进入到中压缸15的第二出汽端继续做功发电,从而有效提高燃煤机组的发电效率,满足较大的用电需求。
如图1所示,在一些实施例中,储放热系统还包括第八阀门20、第九阀门21、第十阀门22和第十一阀门23,第八阀门20设置在中压缸15进汽端与锅炉2第二出汽端相连之间,第九阀门21设置在高压缸3出汽端与锅炉2第二进汽端相连之间,第十阀门22设置在第三通路与中压缸15第二出汽端相连之间,第十一阀门23设置在第三通路远离中压缸15的一端。
可以理解的是,如图2所示,燃煤机组处于深度调峰时段时,将第八阀门20、第九阀门21、第十阀门22和第十一阀门23均开启,使高压缸3出汽端的全部蒸汽进入到锅炉2的第二进汽端,并经过锅炉2的加热后由锅炉2的第二出汽端进入到中压缸15的进汽端进行做功发电,同时中压缸15内的部分蒸汽做功发电后由中压缸15的第二出汽端经过第三通路进入到低压缸16的第二进汽端继续做功发电;
如图3所示,燃煤机组处于非深度调峰时段时,减小第八阀门20和第九阀门21的开度,并将第十阀门22和第十一阀门23开启,使高压缸3出汽端的部分蒸汽进入到中压缸15的进汽端进行做功发电,并使高压缸3出汽端的其余蒸汽进入到中压缸15的第二出汽端继续做功发电,从而提高燃煤机组的发电效率,满足较大的用电需求;
其中,通过调节第八阀门20、第九阀门21、第十阀门22和第十一阀门23,能够控制进入第三通路的蒸汽量,从而调节中压缸15利用熔盐储放热装置进行发电的发电量。
如图1所示,在一些实施例中,熔盐储放热装置还包括第一管路24、第二管路25、第 三管路26、第十二阀门27、第十三阀门28和第十四阀门29,第一管路24的一端与第二通路靠近低温罐7的一端相连,第二管路25的一端与第四通路和第二通路相连之间相连,第二管路25的另一端与第一管路24的另一端相连,第三管路26的一端与第四通路靠近高温罐8的一端相连,第三管路26的另一端与第一管路24的另一端相连,第十二阀门27设置在第一管路24上,第十三阀门28设置在第二管路25上,第十四阀门29设置在第三管路26上。
可以理解的是,通过第一管路24、第二管路25和第三管路26的设置,使部分熔盐在低温罐7与高温罐8之间流通不必经过第二通路和第四通路,且通过调节第十二阀门27、第十三阀门28和第十四阀门29的开度,实现对第二通路和第四通路内熔盐的流量控制,从而实现对熔盐温度的调节,有效提高了整体的灵活性。
在一些实施例中,可将第十二阀门27关闭,通过调节第十三阀门28和第十四阀门29的开度,以控制第二换热器17的换热量。
在一些实施例中,可将第十三阀门28关闭,通过调节第十二阀门27和第十四阀门29的开度,以调节第一换热器1及第二换热器17的换热量。
在一些实施例中,可将第十四阀门29关闭,通过调节第十二阀门27和第十三阀门28的开度,以调节第一换热器1的换热量。
如图1所示,在一些实施例中,锅炉2的第一进汽端与第一通路相连之间设置有第四管路30和第五管路31,升压泵6设置在第四管路30上;储放热系统还包括第十五阀门32和第十六阀门33,第十五阀门32设置在第四管路30上,第十六阀门33设置在第五管路31上。
可以理解的是,如图2所示,燃煤机组处于深度调峰时段时,将第十五阀门32和升压泵6均开启,第十六阀门33关闭,第一通路内的蒸汽放热后经过第四管路30与给液泵4出液端的出液一同进入到锅炉2的第一进汽端;
如图3所示,燃煤机组处于非深度调峰时段时,将第十五阀门32和升压泵6均关闭,第十六阀门33开启,给液泵4出液端的部分出液经过第五管路31进入到第一通道内;
由此,通过第四管路30、第五管路31、第十五阀门32和第十六阀门33的设置,保证熔盐储放热装置的有效储热和放热。
如图1所示,在一些实施例中,储放热系统还包括高压加热器34和第十七阀门35,高压加热器34的出液端与锅炉2的第一进汽端相连,高压加热器34的进液端分别与给液泵4的出液端及第一通路远离锅炉2的一端相连,升压泵6设置在高压加热器34的进液端与第一通路相连之间,第十七阀门35设置在高压加热器34出液端与锅炉2第一进汽端相连之间。
可以理解的是,通过高压加热器34的设置,使给液泵4出液端的出液及第一通路的出液在进入锅炉2第一进汽端之前能够被加热,从而有效提高锅炉2的加热效率,降低锅炉2的能源损耗。
如图1所示,在一些实施例中,储放热系统还包括除氧器36,除氧器36的出液端与给液泵4的进液端相连。
可以理解的是,通过除氧器36的设置,避免储放热系统中液体内的空气对设备、管道等造成腐蚀,延长储放热系统使用寿命的同时保证第一换热器1、给液泵4等部件的高效运行。
在一些实施例中,除氧器36进液端的进液可来自于中压缸15的出汽、低压缸16的出汽以及低压缸16的冷凝液。
在一些实施例中,高压加热器34的出汽端与除氧器36的进液端相连,高压加热器34的进汽端进汽可来自于高压缸3和中压缸15。
如图1所示,在一些实施例中,储放热系统还包括第十八阀门37,第十八阀门37设置在锅炉2第一出汽端与第一通路相连之间。
可以理解的是,通过第十八阀门37的设置,便于配合第一阀门5调节锅炉2第一出汽端的出汽压力,从而改善储放热系统的热效率和经济性。
需要说明的是,在本公开的描述中,术语“第一”、“第二”等仅用于描述目的,而不能理解为指示或暗示相对重要性。此外,在本公开的描述中,除非另有说明,“多个”的含义是两个或两个以上。
流程图中或在此以其他方式描述的任何过程或方法描述可以被理解为,表示包括一个或更多个用于实现特定逻辑功能或过程的步骤的可执行指令的代码的模块、片段或部分,并且本公开的优选实施方式的范围包括另外的实现,其中可以不按所示出或讨论的顺序,包括根据所涉及的功能按基本同时的方式或按相反的顺序,来执行功能,这应被本公开的实施例所属技术领域的技术人员所理解。
在本说明书的描述中,参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不一定指的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
尽管上面已经示出和描述了本公开的实施例,可以理解的是,上述实施例是示例性的,不能理解为对本公开的限制,本领域的普通技术人员在本公开的范围内可以对上述实施例进行变化、修改、替换和变型。
Claims (10)
- 一种燃煤机组蒸汽加热熔盐的储放热系统,其特征在于,包括:第一换热器、锅炉、高压缸、给液泵、第一阀门、升压泵和熔盐储放热装置,所述第一换热器包括:用于换热的第一通路和第二通路;其中,所述锅炉的第一出汽端分别与所述高压缸的进汽端及所述第一通路的一端相连,所述锅炉的第一进汽端分别与所述给液泵的出液端及所述第一通路的另一端相连;所述第一阀门设置在所述锅炉第一出汽端与所述高压缸进汽端相连之间,所述第一阀门用于提高所述锅炉第一出汽端的出汽压力;所述升压泵设置在所述锅炉的第一进汽端与所述第一通路相连之间;所述熔盐储放热装置与所述第一换热器的第二通路相连。
- 根据权利要求1所述燃煤机组蒸汽加热熔盐的储放热系统,其特征在于,所述熔盐储放热装置包括:低温罐,所述低温罐的出液端及进液端分别与所述第二通路的一端相连,所述低温罐内灌装有熔盐;高温罐,所述高温罐的出液端及进液端分别与所述第二通路的另一端相连,所述高温罐内灌装有熔盐;第二阀门,所述第二阀门设置在所述低温罐出液端与所述第二通路相连之间;第三阀门,所述第三阀门设置在所述低温罐进液端与所述第二通路相连之间;第四阀门,所述第四阀门设置在所述高温罐出液端与所述第二通路相连之间;第五阀门,所述第五阀门设置在所述高温罐进液端与所述第二通路相连之间。
- 根据权利要求1或2所述燃煤机组蒸汽加热熔盐的储放热系统,其特征在于,所述熔盐储放热装置还包括:低温泵,所述低温泵设置在所述低温罐的出液端与所述第二通路相连之间;高温泵,所述高温泵设置在所述高温罐的出液端与所述第二通路相连之间。
- 根据权利要求1至3中任一项所述燃煤机组蒸汽加热熔盐的储放热系统,其特征在于,所述储放热系统还包括:中压缸,所述中压缸的进汽端与所述锅炉的第二出汽端相连,所述高压缸的出汽端与所述锅炉的第二进汽端相连;低压缸,所述低压缸的第一进汽端与所述中压缸的第一出汽端相连;第二换热器,所述第二换热器包括:用于换热的第三通路和第四通路,所述第三通路的一端与所述中压缸的第二出汽端相连,所述第三通路的另一端分别与所述高压缸的出汽 端及所述低压缸的第二进汽端相连,所述第四通路设置在所述高温罐与所述第二通路相连之间;第六阀门,所述第六阀门设置在所述第三通路与所述高压缸出汽端相连之间;第七阀门,所述第七阀门设置在所述第三通路与所述低压缸第二进汽端相连之间。
- 根据权利要求4所述燃煤机组蒸汽加热熔盐的储放热系统,其特征在于,所述储放热系统还包括:第八阀门,所述第八阀门设置在所述中压缸进汽端与所述锅炉第二出汽端相连之间;第九阀门,所述第九阀门设置在所述高压缸出汽端与所述锅炉第二进汽端相连之间;第十阀门,所述第十阀门设置在所述第三通路与所述中压缸第二出汽端相连之间;第十一阀门,所述第十一阀门设置在所述第三通路远离所述中压缸的一端。
- 根据权利要求4所述燃煤机组蒸汽加热熔盐的储放热系统,其特征在于,所述熔盐储放热装置还包括:第一管路,所述第一管路的一端与所述第二通路靠近所述低温罐的一端相连;第二管路,所述第二管路的一端与所述第四通路和第二通路相连之间相连,所述第二管路的另一端与所述第一管路的另一端相连;第三管路,所述第三管路的一端与所述第四通路靠近所述高温罐的一端相连,所述第三管路的另一端与所述第一管路的另一端相连;第十二阀门,所述第十二阀门设置在所述第一管路上;第十三阀门,所述第十三阀门设置在所述第二管路上;第十四阀门,所述第十四阀门设置在所述第三管路上。
- 根据权利要求1至6中任一项所述燃煤机组蒸汽加热熔盐的储放热系统,其特征在于,所述锅炉的第一进汽端与所述第一通路相连之间设置有第四管路和第五管路,所述升压泵设置在所述第四管路上;所述储放热系统还包括:第十五阀门和第十六阀门,所述第十五阀门设置在所述第四管路上,所述第十六阀门设置在所述第五管路上。
- 根据权利要求1至7中任一项所述燃煤机组蒸汽加热熔盐的储放热系统,其特征在于,所述储放热系统还包括:高压加热器,所述高压加热器的出液端与所述锅炉的第一进汽端相连,所述高压加热器的进液端分别与所述给液泵的出液端及所述第一通路远离所述锅炉的一端相连,所述升压泵设置在所述高压加热器的进液端与所述第一通路相连之间;第十七阀门,所述第十七阀门设置在所述高压加热器出液端与所述锅炉第一进汽端相连之间。
- 根据权利要求1至8中任意一项所述燃煤机组蒸汽加热熔盐的储放热系统,其特征在于,所述储放热系统还包括:除氧器,所述除氧器的出液端与所述给液泵的进液端相连。
- 根据权利要求1至9中任意一项所述燃煤机组蒸汽加热熔盐的储放热系统,其特征在于,所述储放热系统还包括:第十八阀门,所述第十八阀门设置在所述锅炉第一出汽端与所述第一通路相连之间。
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