CN114718676B - Heat storage and release system for fused salt heated by coal-fired unit steam - Google Patents

Heat storage and release system for fused salt heated by coal-fired unit steam Download PDF

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Publication number
CN114718676B
CN114718676B CN202210399647.0A CN202210399647A CN114718676B CN 114718676 B CN114718676 B CN 114718676B CN 202210399647 A CN202210399647 A CN 202210399647A CN 114718676 B CN114718676 B CN 114718676B
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China
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valve
passage
steam
boiler
outlet end
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CN202210399647.0A
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CN114718676A (en
Inventor
雒青
居文平
马汀山
常东锋
王伟
张建元
王东晔
耿如意
祁文玉
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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Xian Thermal Power Research Institute Co Ltd
Xian Xire Energy Saving Technology Co Ltd
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Priority to CN202210399647.0A priority Critical patent/CN114718676B/en
Priority to PCT/CN2022/101599 priority patent/WO2023197451A1/en
Publication of CN114718676A publication Critical patent/CN114718676A/en
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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
    • 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
    • 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
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The application provides a coal-fired unit steam heating fused salt store up heat release system, store up heat release system includes: first heat exchanger, boiler, high-pressure cylinder, feed pump, first valve, booster pump and fused salt heat storage and release device, first heat exchanger includes: a first passage and a second passage for heat exchange; the first steam outlet end of the boiler is respectively connected with the steam inlet end of the high-pressure cylinder and one end of the first passage, and the first steam inlet end of the boiler is respectively connected with the liquid outlet end of the liquid feeding pump and the other end of the first passage; the first valve is arranged between the first steam outlet end of the boiler and the steam inlet end of the high-pressure cylinder, and is used for improving the steam outlet pressure of the first steam outlet end of the boiler. In the heat storage and release system of the fused salt heated by the coal-fired unit steam, the saturation temperature or critical temperature of the steam in the first passage is effectively improved, and then the highest temperature which can be realized by the fused salt or the steam is improved in the heat exchange process, and the heat efficiency and the economy of the heat storage and release system are improved.

Description

Heat storage and release system for fused salt heated by coal-fired unit steam
Technical Field
The application relates to the technical field of coal-fired power generation, in particular to a heat storage and release system for fused salt heated by steam of a coal-fired unit.
Background
Because the difference of power consumption demands for the generated energy of thermal power plant can't completely match the power consumption demand, lead to the electric quantity not enough or the electric quantity is excessive, consequently partial thermal power plant carries out peak regulation frequency modulation through fused salt energy storage.
In the period of deep peak regulation, if the heat of part of main reheat steam is directly extracted for storage, the main steam volume required under the condition of not utilizing the latent heat is huge, and the safe and stable operation of the system is affected; if the latent heat of the main steam is utilized, the pressure of the main steam is reduced under the deep peak regulation load, and the corresponding saturation temperature is lower, namely a large amount of heat is released in a low-grade temperature interval, so that the problem of pinch point cannot be avoided due to heat exchange between the steam and molten salt, the molten salt cannot be heated to a higher temperature, the energy grade to which the steam can be heated in the heat release process is greatly reduced, the heat efficiency of a heat storage and release system is lower, and the economical efficiency is poor.
Disclosure of Invention
The present application aims to solve, at least to some extent, one of the technical problems in the related art.
Therefore, the purpose of the application is to provide a heat storage and release system for fused salt by steam heating of a coal-fired unit.
To achieve the above object, the present application provides a heat storage and release system for heating molten salt with steam of a coal-fired unit, the heat storage and release system comprising: the heat exchanger comprises a first heat exchanger, a boiler, a high-pressure cylinder, a liquid feeding pump, a first valve, a booster pump and a molten salt heat storage and release device, wherein the first heat exchanger comprises: a first passage and a second passage for heat exchange; the first steam outlet end of the boiler is respectively connected with the steam inlet end of the high-pressure cylinder and one end of the first passage, and the first steam inlet end of the boiler is respectively connected with the liquid outlet end of the liquid feeding pump and the other end of the first passage; 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 for improving the steam outlet pressure of the first steam outlet end of the boiler, and the booster pump is arranged between the first steam inlet end of the boiler and the first passage; the molten salt heat storage and release device is connected with a second passage of the first heat exchanger; the molten salt heat storage and release device further comprises: the molten salt-free high-temperature tank comprises a low-temperature tank, a high-temperature tank, a second valve, a third valve, a fourth valve and a fifth valve, wherein the liquid outlet end and the liquid inlet end of the low-temperature tank are respectively connected with one end of the second passage, molten salt is filled in the low-temperature tank, the liquid outlet end and the liquid inlet end of the high-temperature tank are respectively connected with the other end of the second passage, molten salt is filled in the high-temperature tank, the second valve is arranged between the liquid outlet end of the low-temperature tank and the second passage, the third valve is arranged between the liquid inlet end of the low-temperature tank and the second passage, the fourth valve is arranged between the liquid outlet end of the high-temperature tank and the second passage, and the fifth valve is arranged between the liquid inlet end of the high-temperature tank and the second passage;
the heat storage and release system further includes: the steam inlet end of the medium pressure cylinder is connected with the second steam outlet end of the boiler, the steam outlet end of the high pressure cylinder is connected with the second steam inlet end of the boiler, the first steam inlet end of the low pressure cylinder is connected with the first steam outlet end of the medium pressure cylinder, and the second heat exchanger comprises: the third passage and the fourth passage are used for heat exchange, one end of the third passage is connected with the second steam outlet end of the medium pressure cylinder, the other end of the third passage is respectively connected with the steam outlet end of the high pressure cylinder and the second steam inlet end of the low pressure cylinder, the fourth passage is arranged between the high temperature tank and the second passage, the sixth valve is arranged between the third passage and the steam outlet end of the high pressure cylinder, and the seventh valve is arranged between the third passage and the second steam inlet end of the low pressure cylinder;
the heat storage and release system further includes: the eighth valve is arranged between the steam inlet end of the medium pressure cylinder and the second steam outlet end of the boiler, 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 is arranged between the third passage and the second steam outlet end of the medium pressure cylinder, and the eleventh valve is arranged at one end of the third passage far away from the medium pressure cylinder;
the molten salt heat storage and release device further comprises: the system comprises a first pipeline, a second pipeline, a third pipeline, a twelfth valve, a thirteenth valve and a fourteenth valve, wherein one end of the first pipeline is connected with one end of the second passage close to the low-temperature tank, one end of the second pipeline is connected with the fourth passage and the second passage, the other end of the second pipeline is connected with the other end of the first pipeline, one end of the third pipeline is connected with one end of the fourth passage close to the high-temperature tank, the other end of the third pipeline is connected with the other end of the first pipeline, the twelfth valve is arranged on the first pipeline, the thirteenth valve is arranged on the second pipeline, the fourteenth valve is arranged on the third pipeline, and the twelfth valve, the thirteenth valve and the fourteenth valve are used for adjusting the flow of molten salt in the second passage and the fourth passage so as to adjust the heat absorption and release temperature of the molten salt;
a fourth pipeline and a fifth pipeline are arranged between the first steam inlet end of the boiler and the first passage, the booster pump is arranged on the fourth pipeline, and the heat storage and release system further comprises: a fifteenth valve and a sixteenth valve, the fifteenth valve being disposed on the fourth pipe, the sixteenth valve being disposed on the fifth pipe;
when the coal-fired unit is in a deep peak-shaving period, the second valve, the fifth valve, the seventh valve, the eighth valve, the ninth valve, the tenth valve, the eleventh valve, the fifteenth valve and the booster pump are all opened, and the third valve, the fourth valve, the sixth valve and the sixteenth valve are all closed, so that molten salt in the low-temperature tank sequentially passes through the second valve, the second passage, the fourth passage and the fifth valve and then enters the high-temperature tank, and part of steam discharged from a first steam outlet end of the boiler sequentially passes through the first passage, the booster pump and the fifteenth valve and then enters a first steam inlet end of the boiler, and simultaneously, steam discharged from a second steam outlet end of the medium-pressure cylinder sequentially passes through the tenth valve, the third passage, the eleventh valve and the seventh valve and then enters the low-pressure cylinder;
when the coal-fired unit is in a non-deep peak-shaving period, the third valve, the fourth valve, the sixth valve, the tenth valve, the eleventh valve and the sixteenth valve are all opened, and the second valve, the fifth valve, the seventh valve, the fifteenth valve and the booster pump are all closed, so that molten salt in the high-temperature tank sequentially passes through the fourth valve, the fourth passage, the second passage and the third valve and then enters the low-temperature tank, part of feed liquid at a first steam inlet end of the boiler sequentially passes through the sixteenth valve and the first passage and then enters the high-pressure tank, and part of steam outlet of the high-pressure tank sequentially passes through the sixth valve, the eleventh valve, the third passage and the tenth valve and then enters the medium-pressure tank.
Optionally, the molten salt heat storage and release device further includes: the low-temperature pump is arranged between the liquid outlet end of the low-temperature tank and the second passage; the high-temperature pump is arranged between the liquid outlet end of the high-temperature tank and the second passage.
Optionally, the heat storage and release system further includes: the liquid outlet end of the high-pressure heater is connected with the first steam inlet end of the boiler, the liquid inlet end of the high-pressure heater is respectively connected with the liquid outlet end of the liquid feeding pump and one end of the first passage far away from the boiler, and the booster pump is arranged between the liquid inlet end of the high-pressure heater and the first passage; seventeenth valve, seventeenth valve set up high-pressure heater goes out the liquid end with the boiler first steam inlet end links to each other.
Optionally, the heat storage and release system further includes: the liquid outlet end of the deaerator is connected with the liquid inlet end of the liquid feeding pump.
Optionally, the heat storage and release system further includes: the eighteenth valve is arranged between the first steam outlet end of the boiler and the first passage.
The technical scheme that this application provided can include following beneficial effect:
the opening of the first valve is reduced, so that the output of the liquid feeding pump is improved, the steam outlet pressure of the first steam outlet end of the boiler is effectively improved on the premise that the steam outlet flow of the first steam outlet end of the boiler is unchanged, the steam outlet pressure of the first steam outlet end of the boiler can reach rated pressure or maximum operating pressure, the saturation temperature or critical temperature of steam in the first passage is effectively improved, the highest temperature which can be realized by molten salt or steam is further improved in the heat exchange process, the energy grade of steam in the molten salt heat release process is improved, and the heat efficiency and the economical efficiency of a heat storage and release system are improved.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a heat storage and release system for a fused salt heated by steam of a coal-fired unit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a coal-fired unit in a deep peak shaving period in a heat storage and release system for molten salt heated by steam of the coal-fired unit according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a coal-fired unit in a non-deep peak shaving period in a heat storage and release system for molten salt heated by steam of the coal-fired unit according to an embodiment of the present application;
as shown in the figure: 1. the first heat exchanger, 2, boiler, 3, high pressure cylinder, 4, liquid feed pump, 5, first valve, 6, booster pump, 7, low temperature tank, 8, high temperature tank, 9, second valve, 10, third valve, 11, fourth valve, 12, fifth valve, 13, low temperature pump, 14, high temperature pump, 15, medium pressure cylinder, 16, low pressure cylinder, 17, second heat exchanger, 18, sixth valve, 19, seventh valve, 20, eighth valve, 21, ninth valve, 22, tenth valve, 23, eleventh valve, 24, first pipeline, 25, second pipeline, 26, third pipeline, 27, twelfth valve, 28, thirteenth valve, 29, fourteenth valve, 30, fourth pipeline, 31, fifth pipeline, 32, fifteenth valve, 33, sixteenth valve, 34, high pressure heater, 35, seventeenth valve, 36, deaerator, 37, eighteenth valve.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the present application include all alternatives, modifications, and equivalents as may be included within the spirit and scope of the appended claims.
As shown in fig. 1, an embodiment of the present application proposes a heat storage and release system for molten salt heating by steam of a coal-fired unit, the heat storage and release system includes a first heat exchanger 1, a boiler 2, a high-pressure cylinder 3, a liquid feed pump 4, a first valve 5, a booster pump 6 and a 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 respectively connected with the steam inlet end of the high-pressure cylinder 3 and one end of the first passage, the first steam inlet end of the boiler 2 is respectively connected with the liquid outlet end of the liquid feeding pump 4 and the other end of the first passage, the first valve 5 is arranged 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 for improving the steam outlet pressure of the first steam outlet end of the boiler 2, the booster pump 6 is arranged between the first steam inlet end of the boiler 2 and the first passage, and the molten salt heat storage and release device is connected with the second passage of the first heat exchanger 1.
It can be understood that the liquid feeding pump 4 conveys the liquid to the first steam inlet end of the boiler 2, the boiler 2 burns to heat and convert the liquid into steam, and the steam is conveyed to the high-pressure cylinder 3 from the first steam outlet end of the boiler 2 to do work and generate electricity;
as shown in fig. 2, when the electricity consumption is low, the coal-fired unit is in a deep peak regulation period, and stable combustion of the boiler 2 needs to be ensured, so that a large amount of steam enters the high-pressure cylinder 3 at the first steam outlet end of the boiler 2, the opening degree of the first valve 5 is reduced, the booster pump 6 is started, most of the steam which should enter the high-pressure cylinder 3 in the boiler 2 enters the first passage, so that the first passage exchanges heat with the second passage, the heat storage of the molten salt heat storage and release device is realized, the stable operation of the coal-fired unit is not influenced, and meanwhile, the steam released in the first passage is converted into liquid, and the liquid is boosted by the booster pump 6 and enters the first steam inlet end of the boiler 2 together with the liquid discharged by the liquid feed pump 4, so that the steam is recycled;
as shown in fig. 3, when the electricity consumption is large, the coal-fired unit is in a non-deep peak regulation period, the first valve 5 is completely opened, and the booster pump 6 is closed, so that part of liquid discharged from the liquid feeding pump 4 enters the first passage due to the loss of the booster conveying of the booster pump 6, so that the first passage exchanges heat with the second passage to realize heat release of the molten salt heat storage and release device, and meanwhile, liquid after heat absorption in the first passage is converted into steam and enters the high-pressure cylinder 3 together with the steam discharged from the first steam outlet end of the boiler 2 to perform work and generate electricity, thereby effectively improving the power generation efficiency of the coal-fired unit and meeting large electricity consumption requirements.
The opening of the first valve 5 is reduced, so that the output of the liquid feeding pump 4 is improved, the steam outlet pressure of the first steam outlet end of the boiler 2 is effectively improved on the premise that the steam outlet flow of the first steam outlet end of the boiler 2 is unchanged, the steam outlet pressure of the first steam outlet end of the boiler 2 can reach rated pressure or maximum operating pressure, the saturation temperature or critical temperature of steam in the first passage is effectively improved, the highest temperature which can be realized by molten salt or steam is further improved in the heat exchange process, the energy grade of the steam in the molten salt heat release process is improved, and the heat efficiency and the economical efficiency of a heat storage and release system are improved.
It should be noted that the pressure of steam is proportional to its temperature, namely: the greater the pressure of the steam, the higher the temperature, and conversely, the smaller the pressure of the steam, the lower the temperature.
In some embodiments, the liquid within the heat storage system may be water and the vapor may be water vapor.
As shown in fig. 1, in some embodiments, 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, wherein the liquid outlet end and the liquid inlet end of the low temperature tank 7 are respectively connected with one end of the second passage, molten salt is filled in the low temperature tank 7, the liquid outlet end and the liquid inlet end of the high temperature tank 8 are respectively connected with the other end of the second passage, molten salt is filled in the high temperature tank 8, the second valve 9 is arranged between the liquid outlet end of the low temperature tank 7 and the second passage, the third valve 10 is arranged between the liquid inlet end of the low temperature tank 7 and the second passage, the fourth valve 11 is arranged between the liquid outlet end of the high temperature tank 8 and the second passage, and the fifth valve 12 is arranged between the liquid inlet end of the high temperature tank 8 and the second passage.
It can be understood that as shown in fig. 2, when the coal-fired unit is in the deep peak shaving period, the second valve 9 and the fifth valve 12 are opened, and the third valve 10 and the fourth valve 11 are closed, so that molten salt in the low-temperature tank 7 flows into the high-temperature tank 8 through the second passage, and is heated by steam in the first passage when the molten salt passes through the second passage, and heat storage of the molten salt storage and heat release device is realized;
as shown in fig. 3, when the coal-fired unit is in the non-deep peak shaving period, the second valve 9 and the fifth valve 12 are closed, and the third valve 10 and the fourth valve 11 are opened, so that molten salt in the high-temperature tank 8 flows into the low-temperature tank 7 through the second passage, and liquid in the first passage is heated into steam when the molten salt passes through the second passage, and heat release of the molten salt heat storage and release device is realized.
As shown in fig. 1, in some embodiments, the molten salt heat storage and release device further includes a low temperature pump 13 and a high temperature pump 14, the low temperature pump 13 being disposed between the liquid outlet end of the low temperature tank 7 and the second passage connection, the high temperature pump 14 being disposed between the liquid outlet end of the high temperature tank 8 and the second passage connection.
It can be understood that as shown in fig. 2, when the coal-fired unit is in the deep peak shaving period, the low-temperature pump 13 is started, and the high-temperature pump 14 is closed, so that the low-temperature pump 13 pressurizes the molten salt in the low-temperature tank 7 and then conveys the molten salt into the high-temperature tank 8, and the steam in the first passage is ensured to heat the molten salt in the second passage efficiently;
as shown in fig. 3, when the coal-fired unit is in the non-deep peak shaving period, the low-temperature pump 13 is turned off, and the high-temperature pump 14 is turned on, so that the high-temperature pump 14 pressurizes the molten salt in the high-temperature tank 8 and then conveys the molten salt into the low-temperature tank 7, and the molten salt in the second passage is ensured to efficiently heat the liquid in the first passage.
As shown in fig. 1, in some embodiments, the heat storage and release system further includes a middle pressure cylinder 15, a low pressure cylinder 16, a second heat exchanger 17, a sixth valve 18, and a seventh valve 19, where the steam inlet end of the middle pressure cylinder 15 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, the first steam inlet end of the low pressure cylinder 16 is connected to the first steam outlet end of the middle 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 middle pressure cylinder 15, the other end of the third passage is connected to the steam outlet end of the high pressure cylinder 3 and the second steam inlet end of the low pressure cylinder 16, the fourth passage is connected between the high temperature tank 8 and the second passage, the sixth valve 18 is connected between the third passage and the steam outlet end of the high pressure cylinder 3, and the seventh valve 19 is connected between the third passage and the second steam inlet end of the low pressure cylinder 16.
It can be understood that the steam in the high-pressure cylinder 3 enters the second steam inlet end of the boiler 2 after doing work and generating electricity, the steam enters the medium-pressure cylinder 15 from the second steam outlet end of the boiler 2 after being heated again by the boiler 2 to continue doing work and generating electricity, and the steam in the medium-pressure cylinder 15 enters the first steam inlet end of the low-pressure cylinder 16 from the first steam outlet end of the medium-pressure cylinder 15 to continue doing work and generating electricity after doing work and generating electricity;
as shown in fig. 2, when the electricity consumption is low, the coal-fired unit is in a deep peak regulation period, the sixth valve 18 is closed, the seventh valve 19 is opened, part of steam in the medium pressure cylinder 15 is enabled to enter the third passage from the second steam outlet end of the medium pressure cylinder 15 after doing work and generating electricity, so that the third passage exchanges heat with the fourth passage, heat storage of the molten salt heat storage and release device is realized, stable operation of the coal-fired unit is not affected, and meanwhile, the steam released in the third passage enters the second steam inlet end of the low pressure cylinder 16 to continue doing work and generating electricity;
as shown in fig. 3, when the electricity consumption is large, the coal-fired unit is in a non-deep peak regulation period, the sixth valve 18 is opened, the seventh valve 19 is closed, part of steam in the high-pressure cylinder 3 is enabled to work and generate electricity, and then the steam outlet end of the high-pressure cylinder 3 enters the third passage, so that the third passage exchanges heat with the fourth passage to realize heat release of the molten salt heat storage and release device, and meanwhile, the steam heated in the third passage enters the second steam outlet end of the medium-pressure cylinder 15 to continuously work and generate electricity, so that the power generation efficiency of the coal-fired unit is effectively improved, and larger electricity consumption requirements are met.
As shown in fig. 1, in some embodiments, the heat storage and release system further includes an eighth valve 20, a ninth valve 21, a tenth valve 22, and an eleventh valve 23, wherein the eighth valve 20 is disposed between the steam inlet end of the intermediate pressure cylinder 15 and the second steam outlet end of the boiler 2, the ninth valve 21 is disposed 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 disposed between the third passage and the second steam outlet end of the intermediate pressure cylinder 15, and the eleventh valve 23 is disposed at an end of the third passage remote from the intermediate pressure cylinder 15.
It can be understood that, as shown in fig. 2, when the coal-fired unit is in the deep peak shaving period, the eighth valve 20, the ninth valve 21, the tenth valve 22 and the eleventh valve 23 are all opened, so that all the steam at the steam outlet end of the high-pressure cylinder 3 enters the second steam inlet end of the boiler 2, and after being heated by the boiler 2, enters the steam inlet end of the medium-pressure cylinder 15 from the second steam outlet end of the boiler 2 to perform work and power generation, and meanwhile, part of the steam in the medium-pressure cylinder 15 enters the second steam inlet end of the low-pressure cylinder 16 from the second steam outlet end of the medium-pressure cylinder 15 through the third passage to continue to perform work and power generation;
as shown in fig. 3, when the coal-fired unit is in the non-deep peak regulation period, opening degrees of the eighth valve 20 and the ninth valve 21 are reduced, and the tenth valve 22 and the eleventh valve 23 are opened, so that part of steam at the steam outlet end of the high-pressure cylinder 3 enters the steam inlet end of the medium-pressure cylinder 15 to perform power generation, and the rest of steam at the steam outlet end of the high-pressure cylinder 3 enters the second steam outlet end of the medium-pressure cylinder 15 to continue performing power generation, thereby improving the power generation efficiency of the coal-fired unit and meeting larger power requirements;
wherein, 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 amount of electricity generated by the medium pressure cylinder 15 using the molten salt heat storage and release device.
As shown in fig. 1, in some embodiments, the molten salt heat storage and release device further includes a first pipe 24, a second pipe 25, a third pipe 26, a twelfth valve 27, a thirteenth valve 28, and a fourteenth valve 29, one end of the first pipe 24 is connected to one end of the second pipe adjacent to the low temperature tank 7, one end of the second pipe 25 is connected to between the fourth pipe and the second pipe, the other end of the second pipe 25 is connected to the other end of the first pipe 24, one end of the third pipe 26 is connected to one end of the fourth pipe adjacent to the high temperature tank 8, the other end of the third pipe 26 is connected to the other end of the first pipe 24, the twelfth valve 27 is provided on the first pipe 24, the thirteenth valve 28 is provided on the second pipe 25, and the fourteenth valve 29 is provided on the third pipe 26.
It can be appreciated that by the arrangement of the first pipeline 24, the second pipeline 25 and the third pipeline 26, part of molten salt flows between the low-temperature tank 7 and the high-temperature tank 8 without passing through the second passage and the fourth passage, and the flow control of the molten salt in the second passage and the fourth passage is realized by adjusting the opening of the twelfth valve 27, the thirteenth valve 28 and the fourteenth valve 29, so that the adjustment of the temperature of the molten salt is realized, and the overall flexibility is effectively improved.
In some embodiments, the twelfth valve 27 may be closed, and the heat exchange amount of the second heat exchanger 17 may be controlled by adjusting the opening degrees of the thirteenth valve 28 and the fourteenth valve 29.
In some embodiments, the thirteenth valve 28 may be closed, and the heat exchange amounts of the first heat exchanger 1 and the second heat exchanger 17 may be adjusted by adjusting the opening degrees of the twelfth valve 27 and the fourteenth valve 29.
In some embodiments, the fourteenth valve 29 may be closed to adjust the heat exchange amount of the first heat exchanger 1 by adjusting the opening degrees of the twelfth valve 27 and the thirteenth valve 28.
As shown in fig. 1, in some embodiments, a fourth pipeline 30 and a fifth pipeline 31 are disposed between the first steam inlet end of the boiler 2 and the first passage, and the booster pump 6 is disposed on the fourth pipeline 30; the heat storage and release system further includes a fifteenth valve 32 and a sixteenth valve 33, the fifteenth valve 32 being disposed on the fourth pipe 30, and the sixteenth valve 33 being disposed on the fifth pipe 31.
It can be understood that, as shown in fig. 2, when the coal-fired unit is in the deep peak shaving period, the fifteenth valve 32 and the booster pump 6 are both opened, the sixteenth valve 33 is closed, and the steam in the first passage releases heat and then enters the first steam inlet end of the boiler 2 together with the liquid out of the liquid outlet end of the liquid feeding pump 4 through the fourth pipeline 30;
as shown in fig. 3, when the coal-fired unit is in the non-deep peak shaving period, the fifteenth valve 32 and the booster pump 6 are closed, the sixteenth valve 33 is opened, and part of liquid at the liquid outlet end of the liquid feeding pump 4 enters the first channel through the fifth pipeline 31;
thus, by the arrangement of the fourth pipeline 30, the fifth pipeline 31, the fifteenth valve 32 and the sixteenth valve 33, the effective heat storage and heat release of the molten salt heat storage and release device are ensured.
As shown in fig. 1, in some embodiments, the heat storage and release system further 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 liquid inlet end of the high-pressure heater 34 is connected to the liquid outlet end of the liquid feeding pump 4 and the end of the first passage away from the boiler 2, respectively, the booster pump 6 is disposed between the liquid inlet end of the high-pressure heater 34 and the first passage, and the seventeenth valve 35 is disposed between the liquid outlet end of the high-pressure heater 34 and the first steam inlet end of the boiler 2.
It can be appreciated that by the arrangement of the high-pressure heater 34, the liquid outlet at the liquid outlet end of the liquid feeding pump 4 and the liquid outlet of the first passage can be heated before entering the first steam inlet end of the boiler 2, so that the heating efficiency of the boiler 2 is effectively improved, and the energy loss of the boiler 2 is reduced.
As shown in fig. 1, in some embodiments, the heat storage and release system further includes a deaerator 36, wherein the liquid outlet end of the deaerator 36 is connected to the liquid inlet end of the liquid feed pump 4.
It can be appreciated that by the deaerator 36, the corrosion of the air in the liquid in the heat storage and release system to equipment, pipelines and the like is avoided, the service life of the heat storage and release system is prolonged, and the efficient operation of the components such as the first heat exchanger 1, the liquid feed pump 4 and the like is ensured.
In some embodiments, the intake of deaerator 36 at the intake end may be from the discharge of medium pressure cylinder 15, the discharge of low pressure cylinder 16, and condensate from low pressure cylinder 16.
In some embodiments, 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 end of the high-pressure heater 34 may be from the high-pressure cylinder 3 and the medium-pressure cylinder 15.
As shown in fig. 1, in some embodiments, the heat storage and release system further includes an eighteenth valve 37, the eighteenth valve 37 being disposed between the first steam outlet end of the boiler 2 and the first passage.
It can be appreciated that by arranging the eighteenth valve 37, the steam outlet pressure of the first steam outlet end of the boiler 2 can be conveniently adjusted by matching with the first valve 5, so that the heat efficiency and the economy of the heat storage and release system are improved.
It should be noted that in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (5)

1. A heat storage and release system for heating molten salt by steam of a coal-fired unit, comprising: the heat exchanger comprises a first heat exchanger, a boiler, a high-pressure cylinder, a liquid feeding pump, a first valve, a booster pump and a molten salt heat storage and release device, wherein the first heat exchanger comprises: a first passage and a second passage for heat exchange;
the first steam outlet end of the boiler is respectively connected with the steam inlet end of the high-pressure cylinder and one end of the first passage, and the first steam inlet end of the boiler is respectively connected with the liquid outlet end of the liquid feeding pump and the other end of the first passage;
the first valve is arranged between the first steam outlet end of the boiler and the steam inlet end of the high-pressure cylinder, and is used for improving the steam outlet pressure of the first steam outlet end of the boiler;
the booster pump is arranged between the first steam inlet end of the boiler and the first passage;
the molten salt heat storage and release device is connected with a second passage of the first heat exchanger;
the molten salt heat storage and release device further comprises: the molten salt-free high-temperature tank comprises a low-temperature tank, a high-temperature tank, a second valve, a third valve, a fourth valve and a fifth valve, wherein the liquid outlet end and the liquid inlet end of the low-temperature tank are respectively connected with one end of the second passage, molten salt is filled in the low-temperature tank, the liquid outlet end and the liquid inlet end of the high-temperature tank are respectively connected with the other end of the second passage, molten salt is filled in the high-temperature tank, the second valve is arranged between the liquid outlet end of the low-temperature tank and the second passage, the third valve is arranged between the liquid inlet end of the low-temperature tank and the second passage, the fourth valve is arranged between the liquid outlet end of the high-temperature tank and the second passage, and the fifth valve is arranged between the liquid inlet end of the high-temperature tank and the second passage;
the heat storage and release system further includes: the steam inlet end of the medium pressure cylinder is connected with the second steam outlet end of the boiler, the steam outlet end of the high pressure cylinder is connected with the second steam inlet end of the boiler, the first steam inlet end of the low pressure cylinder is connected with the first steam outlet end of the medium pressure cylinder, and the second heat exchanger comprises: the third passage and the fourth passage are used for heat exchange, one end of the third passage is connected with the second steam outlet end of the medium pressure cylinder, the other end of the third passage is respectively connected with the steam outlet end of the high pressure cylinder and the second steam inlet end of the low pressure cylinder, the fourth passage is arranged between the high temperature tank and the second passage, the sixth valve is arranged between the third passage and the steam outlet end of the high pressure cylinder, and the seventh valve is arranged between the third passage and the second steam inlet end of the low pressure cylinder;
the heat storage and release system further includes: the eighth valve is arranged between the steam inlet end of the medium pressure cylinder and the second steam outlet end of the boiler, 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 is arranged between the third passage and the second steam outlet end of the medium pressure cylinder, and the eleventh valve is arranged at one end of the third passage far away from the medium pressure cylinder;
the molten salt heat storage and release device further comprises: the system comprises a first pipeline, a second pipeline, a third pipeline, a twelfth valve, a thirteenth valve and a fourteenth valve, wherein one end of the first pipeline is connected with one end of the second passage close to the low-temperature tank, one end of the second pipeline is connected with the fourth passage and the second passage, the other end of the second pipeline is connected with the other end of the first pipeline, one end of the third pipeline is connected with one end of the fourth passage close to the high-temperature tank, the other end of the third pipeline is connected with the other end of the first pipeline, the twelfth valve is arranged on the first pipeline, the thirteenth valve is arranged on the second pipeline, the fourteenth valve is arranged on the third pipeline, and the twelfth valve, the thirteenth valve and the fourteenth valve are used for adjusting the flow of molten salt in the second passage and the fourth passage so as to adjust the heat absorption and release temperature of the molten salt;
a fourth pipeline and a fifth pipeline are arranged between the first steam inlet end of the boiler and the first passage, the booster pump is arranged on the fourth pipeline, and the heat storage and release system further comprises: a fifteenth valve and a sixteenth valve, the fifteenth valve being disposed on the fourth pipe, the sixteenth valve being disposed on the fifth pipe;
when the coal-fired unit is in a deep peak-shaving period, the second valve, the fifth valve, the seventh valve, the eighth valve, the ninth valve, the tenth valve, the eleventh valve, the fifteenth valve and the booster pump are all opened, and the third valve, the fourth valve, the sixth valve and the sixteenth valve are all closed, so that molten salt in the low-temperature tank sequentially passes through the second valve, the second passage, the fourth passage and the fifth valve and then enters the high-temperature tank, and part of steam discharged from a first steam outlet end of the boiler sequentially passes through the first passage, the booster pump and the fifteenth valve and then enters a first steam inlet end of the boiler, and simultaneously, steam discharged from a second steam outlet end of the medium-pressure cylinder sequentially passes through the tenth valve, the third passage, the eleventh valve and the seventh valve and then enters the low-pressure cylinder;
when the coal-fired unit is in a non-deep peak-shaving period, the third valve, the fourth valve, the sixth valve, the tenth valve, the eleventh valve and the sixteenth valve are all opened, and the second valve, the fifth valve, the seventh valve, the fifteenth valve and the booster pump are all closed, so that molten salt in the high-temperature tank sequentially passes through the fourth valve, the fourth passage, the second passage and the third valve and then enters the low-temperature tank, part of feed liquid at a first steam inlet end of the boiler sequentially passes through the sixteenth valve and the first passage and then enters the high-pressure tank, and part of steam outlet of the high-pressure tank sequentially passes through the sixth valve, the eleventh valve, the third passage and the tenth valve and then enters the medium-pressure tank.
2. The molten salt heat storage and release system of claim 1, further comprising:
the low-temperature pump is arranged between the liquid outlet end of the low-temperature tank and the second passage;
the high-temperature pump is arranged between the liquid outlet end of the high-temperature tank and the second passage.
3. The coal-fired unit steam heated molten salt heat storage and release system of claim 1, further comprising:
the liquid outlet end of the high-pressure heater is connected with the first steam inlet end of the boiler, the liquid inlet end of the high-pressure heater is respectively connected with the liquid outlet end of the liquid feeding pump and one end of the first passage far away from the boiler, and the booster pump is arranged between the liquid inlet end of the high-pressure heater and the first passage;
seventeenth valve, seventeenth valve set up high-pressure heater goes out the liquid end with the boiler first steam inlet end links to each other.
4. The coal-fired unit steam heated molten salt heat storage and release system of claim 1, further comprising:
the liquid outlet end of the deaerator is connected with the liquid inlet end of the liquid feeding pump.
5. The coal-fired unit steam heated molten salt heat storage and release system of claim 1, further comprising:
the eighteenth valve is arranged between the first steam outlet end of the boiler and the first passage.
CN202210399647.0A 2022-04-15 2022-04-15 Heat storage and release system for fused salt heated by coal-fired unit steam Active CN114718676B (en)

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CN202210399647.0A CN114718676B (en) 2022-04-15 2022-04-15 Heat storage and release system for fused salt heated by coal-fired unit steam
PCT/CN2022/101599 WO2023197451A1 (en) 2022-04-15 2022-06-27 Heat storage and release system of coal-fired unit for steam heating molten salt

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1524236A (en) * 1974-12-16 1978-09-06 Exxon Research Engineering Co Energy storage and transference by means of liquid heat retention materials
CN108316980B (en) * 2018-03-14 2024-01-30 西安热工研究院有限公司 Fused salt heat accumulation and release peak shaving system of thermal power generating unit
CN208418894U (en) * 2018-05-31 2019-01-22 百吉瑞（天津）新能源有限公司 A kind of molten salt energy-storage heating system of power plant's depth peak regulation and flexibility transformation
CN110006026B (en) * 2019-04-18 2023-10-17 北京工业大学 Deep peak regulation system of thermal power plant
CN212054840U (en) * 2020-05-07 2020-12-01 西安西热节能技术有限公司 Shutdown non-shutdown system based on molten salt heat storage
CN112610292A (en) * 2020-12-11 2021-04-06 北京前沿动力科技股份有限公司 Deep peak regulation power generation system
CN114322619A (en) * 2022-03-07 2022-04-12 西子清洁能源装备制造股份有限公司 Multi-tank molten salt energy storage system based on energy gradient utilization

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