CN110006026A - A deep peak shaving system for thermal power plants - Google Patents
A deep peak shaving system for thermal power plants Download PDFInfo
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- CN110006026A CN110006026A CN201910313766.8A CN201910313766A CN110006026A CN 110006026 A CN110006026 A CN 110006026A CN 201910313766 A CN201910313766 A CN 201910313766A CN 110006026 A CN110006026 A CN 110006026A
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- 150000003839 salts Chemical class 0.000 claims abstract description 118
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 238000000605 extraction Methods 0.000 claims abstract description 33
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 230000033228 biological regulation Effects 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000009833 condensation Methods 0.000 claims abstract description 15
- 230000005494 condensation Effects 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000005338 heat storage Methods 0.000 claims abstract description 12
- 230000006837 decompression Effects 0.000 claims abstract description 7
- 238000002844 melting Methods 0.000 claims abstract description 3
- 230000008018 melting Effects 0.000 claims abstract description 3
- 230000004044 response Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 229910017053 inorganic salt Inorganic materials 0.000 claims description 2
- 238000003303 reheating Methods 0.000 claims description 2
- 230000003828 downregulation Effects 0.000 claims 1
- 230000000717 retained effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- 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
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Water Supply & Treatment (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Control Of Turbines (AREA)
Abstract
本发明公开了一种火电厂深度调峰系统，包括过热器、再热器、高压缸、再热蒸汽电动调节阀、主蒸汽电动调节阀、中压缸、低压缸、凝汽器、凝结水泵、低压加热给水换热器、给水泵组、除氧器、高压加热给水换热器、汽轮机低压抽汽系统、四段抽汽、汽轮机高压抽汽系统、高温熔盐给水换热器、高温熔盐泵、高温熔盐储罐、低温熔盐储罐、低温熔盐泵、熔盐预热器、蒸汽凝结型换热器、蒸汽不凝结型换热器和蒸汽减压装置等；本发明利用熔盐储热技术，将机组降负荷调峰时多余的蒸汽热量储存，在机组升负荷调峰过程中，用高温熔盐加热高压给水减少汽轮机抽汽，增加汽轮机出力，提高机组热效率，实现了火电厂灵活性深度调峰。
The invention discloses a deep peak regulation system for a thermal power plant, comprising a superheater, a reheater, a high-pressure cylinder, a reheated steam electric regulating valve, a main steam electric regulating valve, a medium-pressure cylinder, a low-pressure cylinder, a condenser and a condensate pump , low pressure heating feed water heat exchanger, feed water pump group, deaerator, high pressure heating feed water heat exchanger, steam turbine low pressure extraction system, four-stage extraction, steam turbine high pressure extraction system, high temperature molten salt feed water heat exchanger, high temperature melting Salt pump, high temperature molten salt storage tank, low temperature molten salt storage tank, low temperature molten salt pump, molten salt preheater, steam condensation type heat exchanger, steam non-condensation type heat exchanger and steam decompression device, etc.; The molten salt heat storage technology stores the excess steam heat when the unit is load-reducing and peak-shaving. During the unit's load-raising and peak-shaving process, the high-temperature molten salt is used to heat the high-pressure feedwater to reduce the steam extraction of the steam turbine, increase the output of the steam turbine, and improve the thermal efficiency of the unit. Thermal power plant flexibility and deep peak regulation.
Description
技术领域technical field
本发明涉及一种火电厂灵活性改造方案，尤其是一种能够实现火电厂深度调峰的一种火电厂深度调峰系统。The invention relates to a flexible transformation scheme of a thermal power plant, in particular to a thermal power plant deep peak regulation system capable of realizing deep peak regulation of the thermal power plant.
背景技术Background technique
国内电力能源结构不断调整，可再生能源装机容量不断增加，因可再生能源的间歇性和不稳定性对电网安全运行造成一定程度的隐患，为了加大消纳可再生能源，需要增加火电机组的灵活性，以保证用电负荷的稳定。另外，火电机组单机容量不断增加，导致机组低负荷至高负荷区间加大，在调节峰谷电量调节性能变差。尤其是机组夜间调峰过程中，电网负荷小于锅炉最低稳燃负荷，造成了部分能源浪费，如何将该部分能量使用是目前研究的重点任务。The domestic power energy structure is continuously adjusted, and the installed capacity of renewable energy is continuously increasing. Due to the intermittent and unstable nature of renewable energy, the safe operation of the power grid has caused a certain degree of hidden danger. In order to increase the consumption of renewable energy, it is necessary to increase the number of thermal power units. Flexibility to ensure the stability of electricity load. In addition, the continuous increase of the single-unit capacity of thermal power units leads to an increase in the range from low load to high load of the unit, and the adjustment performance of the peak and valley power adjustment becomes poor. Especially during the nighttime peak shaving process of the unit, the grid load is less than the minimum steady combustion load of the boiler, resulting in some energy waste. How to use this part of the energy is the key task of current research.
本发明提出了一种火电厂深度调峰系统，在原有火电厂基础上增加熔盐储热和释热装置，将机组运行过程中产生的多余蒸汽进行热量储存，该部分热量在机组调峰结束，升负荷过程中加热高压给水，减少汽轮机抽汽量，既能提高机组运行效率又能增加机组调节特性，实现了火电机组效率最大化。因此，本发明专利公布了一种火电厂深度调峰系统，满足了电厂深度调峰时的热力需求。The invention proposes a deep peak regulation system for thermal power plants, which adds molten salt heat storage and heat release devices on the basis of the original thermal power plant, and stores the excess steam generated during the operation of the unit for heat storage. , in the process of increasing the load, the high-pressure feed water is heated, and the steam extraction volume of the steam turbine is reduced, which can not only improve the operating efficiency of the unit, but also increase the adjustment characteristics of the unit, and maximize the efficiency of the thermal power unit. Therefore, the patent of the present invention discloses a deep peak shaving system for a thermal power plant, which meets the thermal demand of the power plant during deep peak shaving.
发明内容SUMMARY OF THE INVENTION
本发明解决的技术问题是提供一种火电厂深度调峰系统，利用熔盐储热技术，将机组降负荷调峰时多余的蒸汽热量储存，在机组升负荷调峰过程中，用高温熔盐加热高压给水减少汽轮机抽汽，增加汽轮机出力，提高机组热效率，实现了火电厂灵活性深度调峰。The technical problem solved by the invention is to provide a deep peak regulation system for thermal power plants, which uses the molten salt heat storage technology to store the excess steam heat when the unit is reduced in load and peak regulation. Heating high-pressure feed water reduces steam extraction of the steam turbine, increases the output of the steam turbine, improves the thermal efficiency of the unit, and realizes the flexibility and deep peak regulation of the thermal power plant.
本发明的技术解决方案是：The technical solution of the present invention is:
一种火电厂深度调峰系统，其特征在于，包括再热器1、过热器2、再热蒸汽电动调节阀3、主蒸汽电动调节阀4、高压旁路蒸汽控制阀5、高压缸6、主蒸汽控制阀7、再热蒸汽控制阀8、中压缸9、低压缸10、凝汽器11、低压旁路蒸汽控制阀12、凝结水泵13、低压加热给水换热器14、给水泵组15、除氧器16、高压加热给水换热器17、汽轮机低压抽汽系统18、四段抽汽19、汽轮机高压抽汽系统20、高温熔盐给水换热器21、高温熔盐泵22、高温熔盐储罐23、低温熔盐储罐24、低温熔盐泵25、熔盐预热器26、蒸汽凝结型换热器27、蒸汽不凝结型换热器28和蒸汽减压装置29。A thermal power plant deep peak regulation system is characterized in that it includes a reheater 1, a superheater 2, a reheat steam electric regulating valve 3, a main steam electric regulating valve 4, a high-pressure bypass steam control valve 5, a high-pressure cylinder 6, Main steam control valve 7, reheat steam control valve 8, medium pressure cylinder 9, low pressure cylinder 10, condenser 11, low pressure bypass steam control valve 12, condensate pump 13, low pressure heating feed water heat exchanger 14, feed water pump group 15. Deaerator 16, high pressure heating feed water heat exchanger 17, steam turbine low pressure steam extraction system 18, four-stage steam extraction 19, steam turbine high pressure steam extraction system 20, high temperature molten salt feed water heat exchanger 21, high temperature molten salt pump 22, High temperature molten salt storage tank 23, low temperature molten salt storage tank 24, low temperature molten salt pump 25, molten salt preheater 26, steam condensation type heat exchanger 27, steam non-condensation type heat exchanger 28 and steam decompression device 29.
所述锅炉过热器2出口分为三路，分别连接所述主蒸汽电动调节阀4、所述高压旁路蒸汽控制阀5和所述主蒸汽控制阀7；所述主蒸汽电动调节阀4依次与所述蒸汽减压装置29、所述蒸汽不凝结型换热器28汽测连接；所述主蒸汽控制阀7连接所述高压缸6入口，所述高压缸6出口、所述蒸汽不凝结型换热器28汽测出口、所述高压旁路蒸汽控制阀5出口均与所述再热器1入口相连。The outlet of the boiler superheater 2 is divided into three paths, which are respectively connected to the main steam electric regulating valve 4, the high-pressure bypass steam control valve 5 and the main steam control valve 7; the main steam electric regulating valve 4 is in turn It is connected to the steam decompression device 29 and the non-condensing steam heat exchanger 28; the main steam control valve 7 is connected to the inlet of the high-pressure cylinder 6, the outlet of the high-pressure cylinder 6, and the non-condensing steam The steam test outlet of the type heat exchanger 28 and the outlet of the high-pressure bypass steam control valve 5 are all connected to the inlet of the reheater 1 .
所述再热器1出口分为三路，分别连接所述再热蒸汽电动调节阀3、所述再热蒸汽控制阀8和所述低压旁路蒸汽控制阀12；所述再热蒸汽电动调节阀3依次与所述蒸汽凝结型换热器27汽测、所述熔盐预热器26水侧和所述除氧器16相连；所述再热蒸汽控制阀8连接所述中压缸9入口；所述中压缸9出口依次与所述低压缸10、所述凝汽器11、所述凝结水泵13、所述低压加热给水换热器14水侧、所述除氧器16相连；所述低压旁路蒸汽控制阀12与所述凝汽器11相连；所述除氧器16与所述给水泵组15相连，所述给水泵组15出口分为两路分别与所述高压加热给水换热器17水侧入口和所述高温熔盐给水换热器21水侧入口相连；所述高压加热给水换热器17水侧出口和所述高温熔盐给水换热器21水侧出口与所述锅炉过热器2入口相连。The outlet of the reheater 1 is divided into three paths, which are respectively connected to the reheat steam electric regulating valve 3, the reheat steam control valve 8 and the low pressure bypass steam control valve 12; The valve 3 is sequentially connected to the steam condensing heat exchanger 27, the water side of the molten salt preheater 26 and the deaerator 16; the reheat steam control valve 8 is connected to the medium pressure cylinder 9 The inlet; the outlet of the medium-pressure cylinder 9 is connected to the low-pressure cylinder 10, the condenser 11, the condensate pump 13, the water side of the low-pressure heating feed water heat exchanger 14, and the deaerator 16 in sequence; The low-pressure bypass steam control valve 12 is connected to the condenser 11; the deaerator 16 is connected to the feed water pump group 15, and the outlet of the feed water pump group 15 is divided into two paths, which are respectively connected to the high-pressure heating The water side inlet of the feed water heat exchanger 17 is connected to the water side inlet of the high temperature molten salt feed water heat exchanger 21; the water side outlet of the high pressure heating feed water heat exchanger 17 and the water side outlet of the high temperature molten salt feed water heat exchanger 21 Connected to the inlet of the boiler superheater 2 .
所述低温熔盐储罐24出口连接所述低温熔盐泵25，所述低温熔盐泵25连接所述熔盐预热器26盐侧入口，所述熔盐预热器26盐侧出口分为两路分别连接所述蒸汽凝结型换热器27盐侧入口和蒸汽不凝结型换热器28盐侧入口；所述蒸汽凝结型换热器27盐侧出口和蒸汽不凝结型换热器28盐侧出口连接所述高温熔盐储罐23入口，所述高温熔盐储罐23出口依次连接所述高温熔盐泵22、所述高温熔盐给水换热器21盐侧入口，所述高温熔盐给水换热器21盐侧出口连接所述低温熔盐储罐24入口。The outlet of the low temperature molten salt storage tank 24 is connected to the low temperature molten salt pump 25, the low temperature molten salt pump 25 is connected to the salt side inlet of the molten salt preheater 26, and the salt side outlet of the molten salt preheater 26 is divided into two parts. For the two-way connection, the salt side inlet of the steam condensation type heat exchanger 27 and the salt side inlet of the steam non-condensing type heat exchanger 28 are respectively connected; the salt side outlet of the steam condensation type heat exchanger 27 and the steam non-condensing type heat exchanger are respectively connected. 28 The salt side outlet is connected to the inlet of the high temperature molten salt storage tank 23, and the outlet of the high temperature molten salt storage tank 23 is sequentially connected to the high temperature molten salt pump 22 and the salt side inlet of the high temperature molten salt water supply heat exchanger 21. The salt side outlet of the high temperature molten salt feed water heat exchanger 21 is connected to the inlet of the low temperature molten salt storage tank 24 .
所述汽轮机高压抽汽系统20连接所述高压加热给水换热器17汽测入口，所述汽轮机四段抽汽19连接所述除氧器16，所述汽轮机低压抽汽系统18连接所述低压加热给水换热器14汽测入口，所述高压加热给水换热器17汽测出口连接所述除氧器16，所述低压加热给水换热器14汽测出口连接所述凝汽器11。The steam turbine high pressure steam extraction system 20 is connected to the steam inlet of the high pressure heating feed water heat exchanger 17, the steam turbine four-stage steam extraction 19 is connected to the deaerator 16, and the steam turbine low pressure steam extraction system 18 is connected to the low pressure The steam inlet of the heating feed water heat exchanger 14 is connected to the deaerator 16 at the steam outlet of the high pressure heating feed water heat exchanger 17 , and the condenser 11 is connected to the steam outlet of the low pressure heating feed water heat exchanger 14 .
由主蒸汽控制阀7、高压缸6、再热器1、再热蒸汽控制阀8、中压缸9、低压缸10、凝汽器11、凝结水泵13、低压加热给水换热器14、除氧器16、给水泵组15、高压加热给水换热器17、过热器2、汽轮机高压抽汽系统20、汽轮机四段抽汽19和汽轮机低压抽汽系统18组成的热力系统，保留原汽轮发电机组运行方式。Main steam control valve 7, high pressure cylinder 6, reheater 1, reheat steam control valve 8, medium pressure cylinder 9, low pressure cylinder 10, condenser 11, condensate pump 13, low pressure heating feed water heat exchanger 14, Oxygenator 16, feed water pump group 15, high pressure heating feed water heat exchanger 17, superheater 2, steam turbine high pressure steam extraction system 20, steam turbine four-stage steam extraction 19 and steam turbine low pressure steam extraction system 18. The thermal system consists of the original steam turbine. Generator set operation mode.
锅炉过热器2产生蒸汽，一路蒸汽按原电厂运行方式依次经过主蒸汽控制阀7、高压缸6、再热器1、再热蒸汽控制阀8、中压缸9、低压缸10、凝汽器11、凝结水泵13、低压加热给水换热器14、除氧器16、给水泵组15、高压加热给水换热器17进入锅炉过热器2；另一路蒸汽依次经过主蒸汽电动调节阀4、蒸汽减压装置29、蒸汽不凝结型换热器28、再热器1、再热蒸汽电动调节阀3、蒸汽凝结型换热器27、熔盐预热器26进入除氧器16；低温熔盐储罐24内的低温熔盐依次经过低温熔盐泵25、熔盐预热器26、蒸汽凝结型换热器27、蒸汽不凝结型换热器28进入高温熔盐储罐23；上述过程为机组降负荷调峰储热过程。Boiler superheater 2 generates steam, and one steam of steam passes through main steam control valve 7, high pressure cylinder 6, reheater 1, reheat steam control valve 8, medium pressure cylinder 9, low pressure cylinder 10, and condenser in sequence according to the operation mode of the original power plant. 11. Condensate pump 13, low pressure heating feed water heat exchanger 14, deaerator 16, feed water pump group 15, high pressure heating feed water heat exchanger 17 enter boiler superheater 2; the other steam passes through the main steam electric regulating valve 4, steam in turn Decompression device 29, steam non-condensing heat exchanger 28, reheater 1, reheat steam electric regulating valve 3, steam condensing heat exchanger 27, molten salt preheater 26 enter the deaerator 16; low temperature molten salt The low temperature molten salt in the storage tank 24 enters the high temperature molten salt storage tank 23 through the low temperature molten salt pump 25, the molten salt preheater 26, the steam condensation type heat exchanger 27, and the steam non-condensation type heat exchanger 28 in turn; the above process is as follows: The process of unit load reduction and peak regulation heat storage.
锅炉过热器2产生的全部蒸汽依次经过主蒸汽控制阀7、高压缸6、再热器1、再热蒸汽控制阀8、中压缸9、低压缸10、凝汽器11、凝结水泵13、低压加热给水换热器14、除氧器16、给水泵组15；给水泵组15出口给水由高压加热给水换热器17切换为高温熔盐给水换热器21进入锅炉过热器2；汽轮机高压抽汽系统20与高压加热给水换热器17连接断开；高压加热给水换热器17与除氧器16连接断开；高温熔盐储罐23内的高温熔盐依次经过高温熔盐泵22、高温熔盐给水换热器21进入低温熔盐储罐24；上述过程为机组升负荷调峰释热过程。All steam generated by boiler superheater 2 passes through main steam control valve 7, high pressure cylinder 6, reheater 1, reheat steam control valve 8, medium pressure cylinder 9, low pressure cylinder 10, condenser 11, condensate pump 13, The low pressure heating feed water heat exchanger 14, the deaerator 16, the feed water pump group 15; the feed water at the outlet of the feed water pump group 15 is switched from the high pressure heating feed water heat exchanger 17 to the high temperature molten salt feed water heat exchanger 21 and enters the boiler superheater 2; the steam turbine high pressure The steam extraction system 20 is disconnected from the high pressure heating feed water heat exchanger 17; the high pressure heating feed water heat exchanger 17 is disconnected from the deaerator 16; the high temperature molten salt in the high temperature molten salt storage tank 23 passes through the high temperature molten salt pump 22 in turn . The high temperature molten salt feed water heat exchanger 21 enters the low temperature molten salt storage tank 24; the above process is the process of unit load increasing peak regulation and releasing heat.
一种火电厂深度调峰系统，其中，包括如下：A deep peak shaving system for a thermal power plant, including the following:
汽轮发电机组响应电网负荷深度下调时，保证锅炉最佳运行效率，一路蒸汽进入原汽轮机系统做功，满足电网负荷响应；锅炉过热器2产生多余蒸汽依次在蒸汽不凝结型换热器28、蒸汽凝结型换热器27、熔盐预热器26内低温熔盐与蒸汽进行换热，完成热量储存；When the steam turbine generator set responds to the deep reduction of the grid load, the best operation efficiency of the boiler is ensured, and one steam enters the original steam turbine system to do work to meet the grid load response; the excess steam generated by the boiler superheater 2 is in turn in the steam non-condensing type heat exchanger 28, steam The condensing heat exchanger 27 and the molten salt preheater 26 conduct heat exchange between the low-temperature molten salt and the steam to complete the heat storage;
汽轮发电机组响应电网负荷快速上调时，锅炉过热器2产生的蒸汽全部进入汽轮机做功；高压加热给水换热器17运行方式改为高温熔盐给水换热器21运行，切断汽轮机高压抽汽系统20运行，提高机组快速响应能力；高温熔盐与高压给水在高温熔盐给水换热器21内进行换热，完成热量释放；When the steam turbine generator set responds to the rapid increase of the grid load, all the steam generated by the boiler superheater 2 enters the steam turbine to do work; the operation mode of the high pressure heating feed water heat exchanger 17 is changed to the operation of the high temperature molten salt feed water heat exchanger 21, and the high pressure steam extraction system of the steam turbine is cut off. 20 operation to improve the rapid response capability of the unit; heat exchange between high temperature molten salt and high pressure feed water is carried out in the high temperature molten salt feed water heat exchanger 21 to complete heat release;
一种火电厂深度调峰系统，其中，所述蒸汽不凝结型换热器28汽侧出口温度和压力分别与所述汽轮机高压缸6排汽口温度和压力相同。A deep peak shaving system for a thermal power plant, wherein the temperature and pressure of the steam side outlet of the non-condensing steam heat exchanger 28 are respectively the same as the temperature and pressure of the steam outlet of the high pressure cylinder 6 of the steam turbine.
所述的一种火电厂深度调峰系统，其中，所述高温熔盐使用四元混合无机盐，熔点为100℃，熔融态使用温度范围为150℃-625℃。The deep peak shaving system for a thermal power plant, wherein the high-temperature molten salt uses a quaternary mixed inorganic salt, the melting point is 100°C, and the use temperature range of the molten state is 150°C-625°C.
与现有调峰技术相比，本发明一种火电厂深度调峰系统有如下技术优点：Compared with the existing peak regulation technology, the deep peak regulation system of the thermal power plant of the present invention has the following technical advantages:
(1)利用熔盐储热技术，将锅炉运行效率维持在最佳，提高了大型燃煤机组运行的经济性；(1) Using the molten salt heat storage technology, the boiler operation efficiency is maintained at the best, and the economy of the operation of large coal-fired units is improved;
(2)采用蒸汽不凝结型换热器，使熔盐和蒸汽进行换热，蒸汽回至再热器，避免了抽汽量增加引起的锅炉尾部受热面超温现象，未改变锅炉原有热负荷，保证了锅炉运行的安全性；(2) The steam non-condensing type heat exchanger is used to exchange heat between molten salt and steam, and the steam is returned to the reheater, which avoids the overheating phenomenon of the heating surface at the tail of the boiler caused by the increase of steam extraction, and does not change the original heat of the boiler. load to ensure the safety of boiler operation;
(3)储热系统的利用，降低了发电机组负荷，可使可再生能源进网量增加，增加了电网可调节性。(3) The utilization of the heat storage system reduces the load of the generator set, increases the amount of renewable energy entering the grid, and increases the adjustability of the grid.
附图说明Description of drawings
图1为本发明所提供的一种火电厂深度调峰系统的流程图意图；Fig. 1 is the schematic flow chart of a kind of thermal power plant deep peak regulation system provided by the present invention;
图2为本发明的机组降负荷调峰储热过程的流程图；Fig. 2 is the flow chart of the heat storage process of unit load reduction and peak regulation according to the present invention;
图3为本发明的机组升负荷调峰释热过程的流程图。FIG. 3 is a flow chart of the process of increasing the load and adjusting the peak and releasing heat of the unit according to the present invention.
1：再热器 2：过热器 3：再热蒸汽电动调节阀1: Reheater 2: Superheater 3: Reheat steam electric regulating valve
4：主蒸汽电动调节阀 5：高压旁路蒸汽控制阀 6：高压缸4: Main steam electric regulating valve 5: High pressure bypass steam control valve 6: High pressure cylinder
7：主蒸汽控制阀 8：再热蒸汽控制阀 9：中压缸7: Main steam control valve 8: Reheat steam control valve 9: Medium pressure cylinder
10：低压缸 11：凝汽器 12：低压旁路蒸汽控制阀10: Low pressure cylinder 11: Condenser 12: Low pressure bypass steam control valve
13：凝结水泵 14：低压加热给水换热器 15：给水泵组13: Condensate pump 14: Low pressure heating feed water heat exchanger 15: Feed water pump group
16：除氧器 17：高压加热给水换热器 18：汽轮机低压抽汽系统16: Deaerator 17: High pressure heating feed water heat exchanger 18: Turbine low pressure extraction system
19：四段抽汽 20：汽轮机高压抽汽系统 21：高温熔盐给水换热器19: Four-stage extraction 20: Turbine high pressure extraction system 21: High temperature molten salt feed water heat exchanger
22：高温熔盐泵 23：高温熔盐储罐 24：低温熔盐储罐22: High temperature molten salt pump 23: High temperature molten salt storage tank 24: Low temperature molten salt storage tank
25：低温熔盐泵 26：熔盐预热器 27：蒸汽凝结型换热器25: Low temperature molten salt pump 26: Molten salt preheater 27: Steam condensation heat exchanger
28：蒸汽不凝结型换热器 29：蒸汽减压装置28: Steam non-condensing heat exchanger 29: Steam decompression device
具体实施方式Detailed ways
为了对本发明的技术特征、目的和效果有更加清楚的理解，现对照附图说明本发明的具体实施方式。In order to have a clearer understanding of the technical features, objects and effects of the present invention, the specific embodiments of the present invention will now be described with reference to the accompanying drawings.
请参阅图1、图2和图3，本发明的一种火电厂深度调峰系统的较佳的实施方式，具体部件连接，见图1，机组降负荷调峰储热过程，工作示意图见图2，机组升负荷调峰释热过程，工作示意图见图3。Please refer to Fig. 1, Fig. 2 and Fig. 3, a preferred embodiment of a thermal power plant deep peak shaving system of the present invention, the specific components are connected, see Fig. 1, the unit load reduction peak shaving heat storage process, the working schematic diagram is shown in Fig. 2. The process of peak load regulation and heat release of the unit is shown in Figure 3 for the working schematic diagram.
如上所述的一种火电厂深度调峰系统，其较佳的实施例中，机组降负荷调峰储热过程：In a preferred embodiment of the above-mentioned deep peak shaving system for thermal power plants, the process of unit load-reducing peak shaving and heat storage is as follows:
如图2所示，汽轮发电机组响应电网负荷深度下调时，锅炉过热器2产生的蒸汽，一路蒸汽按原电厂运行方式依次经过主蒸汽控制阀7、高压缸6、再热器1、再热蒸汽控制阀8、中压缸9、低压缸10、凝汽器11、凝结水泵13、低压加热给水换热器14、除氧器16、给水泵组15、高压加热给水换热器17进入锅炉过热器2；另一路蒸汽依次经过主蒸汽电动调节阀4、蒸汽减压装置29、蒸汽不凝结型换热器28、再热器1、再热蒸汽电动调节阀3、蒸汽凝结型换热器27、熔盐预热器26进入除氧器16；低温熔盐储罐24内的低温熔盐依次经过低温熔盐泵25、熔盐预热器26、蒸汽凝结型换热器27、蒸汽不凝结型换热器28进入高温熔盐储罐23，蒸汽与低温熔盐在蒸汽不凝结型换热器28、蒸汽凝结型换热器27、熔盐预热器26内完成热量交换并储存。As shown in Figure 2, when the steam turbine generator set responds to the deep reduction of the grid load, the steam generated by the boiler superheater 2 will pass through the main steam control valve 7, the high pressure cylinder 6, the reheater 1, and the reheater according to the operation mode of the original power plant. Hot steam control valve 8, medium pressure cylinder 9, low pressure cylinder 10, condenser 11, condensate pump 13, low pressure heating feed water heat exchanger 14, deaerator 16, feed water pump group 15, high pressure heating feed water heat exchanger 17 enter Boiler superheater 2; the other steam passes through the main steam electric regulating valve 4, the steam decompression device 29, the steam non-condensing heat exchanger 28, the reheater 1, the reheating steam electric regulating valve 3, the steam condensation type heat exchange The low temperature molten salt in the low temperature molten salt storage tank 24 passes through the low temperature molten salt pump 25, the molten salt preheater 26, the steam condensation type heat exchanger 27, the steam The non-condensing heat exchanger 28 enters the high-temperature molten salt storage tank 23, and the steam and the low-temperature molten salt complete heat exchange and storage in the steam non-condensing heat exchanger 28, the steam condensing heat exchanger 27, and the molten salt preheater 26. .
如上所述的一种火电厂深度调峰系统，其较佳的实施例中，机组升负荷调峰释热过程：In a preferred embodiment of the above-mentioned deep peak shaving system for thermal power plants, the process of peak shaving and heat release during unit load increase:
如图3所示，汽轮发电机组响应电网负荷上调时，锅炉过热器2产生的全部蒸汽依次经过主蒸汽控制阀7、高压缸6、再热器1、再热蒸汽控制阀8、中压缸9、低压缸10、凝汽器11、凝结水泵13、低压加热给水换热器14、除氧器16、给水泵组15；给水泵组15出口给水由高压加热给水换热器17切换为高温熔盐给水换热器21进入锅炉过热器2；汽轮机高压抽汽系统20与高压加热给水换热器17连接断开；高压加热给水换热器17与除氧器16连接断开；高温熔盐储罐23内的高温熔盐依次经过高温熔盐泵22、高温熔盐给水换热器21进入低温熔盐储罐24，高温熔盐与高压给水在高温熔盐给水换热器21内进行换热，完成热量释放。As shown in Fig. 3, when the steam turbine generator set responds to the increase of the grid load, all the steam generated by the boiler superheater 2 passes through the main steam control valve 7, the high pressure cylinder 6, the reheater 1, the reheat steam control valve 8, the medium pressure Cylinder 9, low pressure cylinder 10, condenser 11, condensate pump 13, low pressure heating feed water heat exchanger 14, deaerator 16, feed water pump group 15; The high temperature molten salt feed water heat exchanger 21 enters the boiler superheater 2; the turbine high pressure steam extraction system 20 is disconnected from the high pressure heating feed water heat exchanger 17; the high pressure heating feed water heat exchanger 17 is disconnected from the deaerator 16; The high temperature molten salt in the salt storage tank 23 enters the low temperature molten salt storage tank 24 through the high temperature molten salt pump 22 and the high temperature molten salt feed water heat exchanger 21 in turn, and the high temperature molten salt and the high pressure feed water are carried out in the high temperature molten salt feed water heat exchanger 21. Heat exchange, complete heat release.
以上所述为本发明结构示意、原理和技术优点。本行业的技术人员，在不脱离本发明的构思和原则的前提下所作出的等同变化与修改，均应属于本发明保护的范围。The above description is the structural representation, principle and technical advantages of the present invention. The equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.
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