CN115371027A - Thermal power peak regulation system - Google Patents

Thermal power peak regulation system Download PDF

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Publication number
CN115371027A
CN115371027A CN202211022210.1A CN202211022210A CN115371027A CN 115371027 A CN115371027 A CN 115371027A CN 202211022210 A CN202211022210 A CN 202211022210A CN 115371027 A CN115371027 A CN 115371027A
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heat exchanger
molten salt
temperature
heat release
heat
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CN202211022210.1A
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CN115371027B (en
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王亮
张涵
陈海生
林曦鹏
李文
左志涛
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Institute of Engineering Thermophysics of CAS
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Institute of Engineering Thermophysics of CAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/028—Steam generation using heat accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • 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
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • 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
    • 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
    • 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
    • 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)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention relates to the technical field of thermal power peak regulation, in particular to a thermal power peak regulation system. The flow of molten salt entering the second heat-release heat exchanger, the third heat-release heat exchanger and the fourth heat-release heat exchanger is adjusted by arranging the first auxiliary branch, the second auxiliary branch and the third auxiliary branch, so that the temperature of the molten salt at the outlet ends of different heat-release heat exchangers is controlled, the steam or water heated by the heat-release heat exchangers can be matched with the temperature of the steam or water circulating in the system, and the operating efficiency and the peak load shifting capacity of the thermal power generation peak regulation system are improved while the output energy of the boiler body is kept stable in the energy release and peak load regulation processes.

Description

Thermal power peak regulation system
Technical Field
The invention relates to the technical field of thermal power generation peak regulation, in particular to a thermal power peak regulation system.
Background
Along with the continuous adjustment of power energy structure, renewable energy installed capacity is constantly increased, because of renewable energy's intermittent type nature and instability cause the hidden danger of certain degree to the safe operation of electric wire netting, in order to increase and consume renewable energy, need increase thermal power unit's flexibility to guarantee the stability of power consumption load. In addition, the capacity of a single machine of the thermal power generating unit is continuously increased, so that the interval from low load to high load of the unit is enlarged, and the electric quantity adjusting performance is deteriorated in peak and valley adjustment. Especially, in the process of peak shaving of the unit at night, the load of a power grid is smaller than the lowest stable combustion load of a boiler, and partial energy waste is caused.
In order to reduce energy waste, in the prior art, a heat storage device and a heat release device are additionally arranged in a thermal power generation system, redundant steam generated in the operation process of a unit is subjected to heat storage, the part of heat is subjected to peak load regulation of the unit, high-pressure feed water is heated in the load increasing process, the steam extraction quantity of a steam turbine is reduced, the operation efficiency of the unit can be improved, and the regulation characteristic of the unit can be improved. However, because the temperature between the extracted steam of the steam turbine and the pre-stored redundant steam is not matched when the high-pressure feed water is heated, the extracted steam temperature of the steam turbine can be kept constant, the temperature of the pre-stored redundant steam can be continuously reduced, and when the extracted steam of the steam turbine and the redundant steam heat the high-pressure feed water at the same time, the heat part of the extracted steam of the steam turbine can be absorbed by the redundant steam, so that the heat of the extracted steam of the steam turbine can not be completely absorbed by the high-pressure feed water, and the operation efficiency of the thermal power generation peak regulation system is greatly reduced.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect of low operation efficiency of the thermal power generation peak shaving system in the prior art, so that the thermal power generation peak shaving system is provided.
In order to solve the technical problem, the invention provides a thermal power peak regulation system, wherein a reheating pipeline is communicated between a high-pressure cylinder and a boiler body, and the reheating pipeline comprises:
the outlet end of the low-temperature molten salt storage part is communicated with the inlet end of the high-temperature molten salt storage part;
the cold side of the first heat storage heat exchanger is communicated between the high-temperature molten salt storage piece and the low-temperature molten salt storage piece, and the hot side of the first heat storage heat exchanger is communicated between the outlet end of the boiler body and the inlet end of the deaerator;
the cold side of the first heat release heat exchanger is communicated between the inlet of the boiler body and the reheating pipeline, the hot side inlet end of the first heat release heat exchanger is communicated with the outlet end of the high-temperature molten salt storage part, and a first temperature sensor is mounted at the hot side outlet end of the first heat release heat exchanger;
a cold side of the second heat-releasing heat exchanger is communicated between the main water feeding pump and the inlet of the boiler body, a hot side inlet end of the second heat-releasing heat exchanger is communicated with a hot side outlet end of the first heat-releasing heat exchanger, a hot side inlet end of the second heat-releasing heat exchanger is also communicated with a hot side outlet end of the first heat-releasing heat exchanger, and a second temperature sensor is arranged at the hot side outlet end of the second heat-releasing heat exchanger;
a cold side inlet end of the third heat release heat exchanger is communicated between the multistage low-pressure heaters, a cold side outlet end of the third heat release heat exchanger is communicated with an inlet end of the deaerator, a hot side inlet end of the third heat release heat exchanger is communicated with a hot side outlet end of the second heat release heat exchanger, a hot side inlet end of the third heat release heat exchanger is also communicated with a second auxiliary branch, and a third temperature sensor is arranged at the hot side outlet end of the third heat release heat exchanger;
a hot side inlet end of the fourth heat release heat exchanger is communicated with a hot side outlet end of the third heat release heat exchanger, a hot side outlet end of the fourth heat release heat exchanger is communicated with an inlet end of the low-temperature molten salt storage piece, a hot side inlet end of the fourth heat release heat exchanger is also communicated with a hot side outlet end of the third heat release heat exchanger, and a fourth temperature sensor is installed at the hot side outlet end of the fourth heat release heat exchanger;
when the thermal power peak regulating system is used for heat release, the molten salt temperatures of the outlet ends of the hot side of the first heat release heat exchanger, the second heat release heat exchanger, the third heat release heat exchanger and the fourth heat release heat exchanger are respectively acquired in real time by using the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor and are respectively recorded as a first molten salt temperature, a second molten salt temperature, a third molten salt temperature and a fourth molten salt temperature;
judging whether the temperature of the first molten salt is greater than a first set temperature value or not, if the temperature of the first molten salt is not greater than the first set temperature value, increasing the input quantity of high-temperature molten salt at the hot side of the first heat release heat exchanger, and/or reducing the input quantity of steam at the cold side of the first heat release heat exchanger;
if the first molten salt temperature is higher than a first set temperature value, judging whether the second molten salt temperature is higher than a second set temperature value, and if the second molten salt temperature is not higher than the second set temperature value, reducing the flow of high-temperature molten salt in the first auxiliary branch and/or reducing the input quantity of a cold-side working medium of the second heat release heat exchanger;
if the second molten salt temperature is higher than the second set temperature value, judging whether the third molten salt temperature is higher than a third set temperature value, and if the third molten salt temperature is not higher than the third set temperature value, reducing the flow of high-temperature molten salt in the second auxiliary branch and/or reducing the input quantity of a water working medium at the cold side of a third heat release heat exchanger;
and if the third molten salt temperature is higher than the third set temperature value, judging whether the fourth molten salt temperature is higher than a fourth set temperature value, and if the fourth molten salt temperature is not higher than the fourth set temperature value, reducing the flow of the high-temperature molten salt in the third auxiliary branch and/or reducing the input quantity of the working medium of the cold side water of the fourth heat release heat exchanger.
Optionally, a first regulating valve is installed between the reheating pipeline and the cold side of the first heat-releasing heat exchanger, and a high-temperature molten salt drive pump is installed between the outlet end of the high-temperature molten salt storage part and the first heat-releasing heat exchanger.
Optionally, the thermal power peaking system further includes at least one of a first, second, and third three-way valve;
the hot side inlet end of the second heat-releasing heat exchanger and the hot side outlet end of the first heat-releasing heat exchanger are respectively communicated with two valve ports of the first three-way valve, and the first auxiliary branch is connected to the other valve port of the first three-way valve;
the hot side inlet end of the third heat-releasing heat exchanger and the hot side outlet end of the second heat-releasing heat exchanger are respectively communicated with two valve ports of a second three-way valve, and a second auxiliary branch is connected to the other valve port of the second three-way valve;
the hot side inlet end of the fourth heat-releasing heat exchanger and the hot side outlet end of the third heat-releasing heat exchanger are respectively communicated with two valve ports of the third three-way valve, and the third auxiliary branch is connected to the other valve port of the third three-way valve.
Optionally, the system further comprises an auxiliary heat release heat exchanger, a hot side inlet end of the auxiliary heat release heat exchanger is communicated with a hot side outlet end of the first heat release heat exchanger, a hot side outlet end of the auxiliary heat release heat exchanger is communicated with a hot side inlet end of the third heat release heat exchanger, the hot side inlet end of the auxiliary heat release heat exchanger and the hot side outlet end of the third heat release heat exchanger are also directly communicated with a fourth auxiliary branch, a cold side inlet end of the auxiliary heat release heat exchanger is communicated with an outlet end of the deaerator, and a cold side outlet end of the auxiliary heat release heat exchanger is communicated with the low-pressure cylinder.
Optionally, the heat exchanger further comprises a fourth three-way valve, the hot-side inlet end of the auxiliary heat-releasing heat exchanger and the hot-side outlet end of the first heat-releasing heat exchanger are respectively communicated with two valve ports of the fourth three-way valve, and the fourth auxiliary branch is connected to another valve port of the fourth three-way valve.
Optionally, a deoxygenation water pump is arranged between the outlet end of the deoxygenator and the cold-side inlet end of the auxiliary heat release heat exchanger.
Optionally, the boiler further comprises a second heat storage heat exchanger, wherein the cold side of the second heat storage heat exchanger is installed between the cold side of the first heat storage heat exchanger and the high-temperature molten salt storage piece in series, and the hot side of the second heat storage heat exchanger is installed between the hot side of the first heat storage heat exchanger and the boiler body in series.
Optionally, the heat recovery system further comprises a heat storage auxiliary branch, one end of the heat storage auxiliary branch is communicated with the reheating pipeline, and the other end of the heat storage auxiliary branch is connected between the hot side of the first heat storage heat exchanger and the hot side of the second heat storage heat exchanger.
Optionally, the working medium is heated sequentially by the boiler body to drive the high-pressure cylinder to operate, and then flows back to the boiler body through the reheating pipeline to be heated secondarily to drive the intermediate pressure cylinder to operate.
Optionally, a water supply auxiliary branch is further installed at the outlet of the intermediate pressure cylinder, a small water supply pump turbine is installed on the water supply auxiliary branch, the outlet end of the small water supply pump turbine is communicated with the condenser, and the small water supply pump turbine is connected with the main water supply pump through a shaft.
The technical scheme of the invention has the following advantages:
1. according to the thermal power peak regulation system provided by the invention, the peak regulation is carried out by coupling the multi-stage molten salt heat storage and release system in the thermal power generation system, and redundant energy is stored in the molten salt by using the thermal power peak regulation system during the electricity utilization valley so as to heat and raise the temperature of the molten salt. Molten salt in the low-temperature molten salt storage part is heated by taking steam from the boiler body and utilizing the first heat storage and exchange part, and then is conveyed and stored into the high-temperature molten salt storage part. The molten salt can be further heated by surplus electric quantity in the low-ebb electricity consumption process in the high-temperature molten salt storage part. In the peak period of power utilization, the first heat-releasing heat exchanger, the second heat-releasing heat exchanger, the third heat-releasing heat exchanger and the fourth heat-releasing heat exchanger are used for releasing heat and releasing energy step by step in a multi-stage mode, and the top load capacity of the thermal power peak regulation system in the peak period of power utilization is improved. And setting a first set temperature, a second set temperature, a third set temperature and a fourth set temperature corresponding to the first heat-releasing heat exchanger, the second heat-releasing heat exchanger, the third heat-releasing heat exchanger and the fourth heat-releasing heat exchanger according to the actual running state of the system. Controlling the input amount of the hot side height Wen Rongyan in the first heat release heat exchanger and/or the input amount of the cold side steam of the first heat release heat exchanger according to the first set temperature, ensuring that the temperature of the first molten salt is higher than the first set temperature value, and controlling the heat exchange amount of the high-temperature molten salt in the first heat release heat exchanger; controlling the amount of high-temperature molten salt which directly passes through the second heat release heat exchanger without heat exchange through the first auxiliary branch according to a second set temperature, namely controlling the input amount of high-temperature molten salt at the hot side of the second heat release heat exchanger and/or the input amount of water working medium at the cold side of the second heat release heat exchanger, ensuring that the temperature of the second molten salt is greater than a second set temperature value, and further controlling the heat exchange amount of the high-temperature molten salt in the second heat release heat exchanger; controlling the amount of high-temperature molten salt directly crossing the third heat release heat exchanger through the second auxiliary branch according to a third set temperature, namely the input amount of high-temperature molten salt on the hot side of the third heat release heat exchanger and/or the input amount of water working medium on the cold side of the third heat release heat exchanger, and ensuring that the temperature of the third molten salt is always greater than the third set temperature value, so as to control the heat exchange amount of the high-temperature molten salt in the third heat release heat exchanger; and controlling the amount of the high-temperature molten salt which does not exchange heat when passing through the fourth heat release heat exchanger through the third auxiliary branch according to a fourth set temperature, namely controlling the input amount of the high-temperature molten salt at the hot side of the fourth heat release heat exchanger and/or the input amount of the water working medium at the cold side of the fourth heat release heat exchanger, so as to ensure that the temperature of the fourth molten salt is always greater than the fourth set temperature value, and further controlling the heat exchange amount of the high-temperature molten salt in the fourth heat release heat exchanger. The trend and the flow of the high-temperature molten salt are regulated and controlled according to the first set temperature, the second set temperature, the third set temperature and the fourth set temperature, so that the heat exchange quantity of the high-temperature molten salt in different heat release heat exchangers is controlled, the required heat in the power generation system is regulated and controlled, the temperature compensation quantity of steam in the power generation system can be accurately controlled, the heat storage and release efficiency of the high-temperature molten salt is improved, and the operating efficiency of a thermal power peak regulation system is improved.
2. According to the thermal power peak regulating system provided by the invention, the first regulating valve is arranged between the reheating pipeline and the cold side of the first heat release heat exchanger, and the high-temperature molten salt drive pump is arranged between the outlet end of the high-temperature molten salt storage part and the first heat release heat exchanger. The power of the high-temperature molten salt driving pump is controlled, the valve port opening of the first regulating valve is adjusted, the temperature of the first molten salt is controlled to be matched with the first set temperature, steam output by the cold side of the first heat release heat exchanger is matched with the temperature of steam in a system at the joint of the cold side of the first heat release heat exchanger, and the operation efficiency and the peak load shifting capacity of the thermal power generation peak regulation system are improved.
3. The thermal power peak regulating system provided by the invention also comprises an auxiliary heat release heat exchanger, wherein the hot side inlet end of the auxiliary heat release heat exchanger is communicated with the hot side outlet end of the first heat release heat exchanger, the hot side outlet end of the auxiliary heat release heat exchanger is communicated with the hot side inlet end of the third heat release heat exchanger, the hot side inlet end of the auxiliary heat release heat exchanger and the hot side outlet end of the auxiliary heat release heat exchanger are also directly communicated with a fourth auxiliary branch, the cold side inlet end of the auxiliary heat release heat exchanger is communicated with the outlet end of the deaerator, and the cold side outlet end of the auxiliary heat release heat exchanger is communicated with the low-pressure cylinder. The auxiliary heat release heat exchanger is connected in parallel with the second heat release heat exchanger, and the deaerated water is heated and then conveyed to the low-pressure cylinder for supplementing steam for driving the low-pressure cylinder to operate and improving the operating power of the low-pressure cylinder.
4. The thermal power peak regulating system further comprises a second heat storage heat exchanger, wherein the cold side of the second heat storage heat exchanger is installed between the cold side of the first heat storage heat exchanger and the high-temperature molten salt storage piece in series, and the hot side of the second heat storage heat exchanger is installed between the hot side of the first heat storage heat exchanger and the boiler body in series. Through setting up second heat storage heat exchanger, the fused salt after to rising temperature through high-temperature steam with first heat storage heat exchanger series work heaies up, and steam after through the release heat heaies up to the low temperature fused salt of following output in the low temperature fused salt storage tank, carries out the two-stage to the fused salt and heaies up for the fused salt can be to the abundant absorption of heat in the steam, promotes from the fused salt temperature difference in low temperature fused salt storage piece and the high temperature fused salt storage piece, promotes energy storage efficiency.
5. According to the thermal power peak regulation system provided by the invention, the working medium is sequentially heated by the boiler body and then drives the high-pressure cylinder to operate, and then flows back to the boiler body through the reheating pipeline and is secondarily heated and then drives the intermediate-pressure cylinder to operate. Through setting up the reheat pipeline, make the steam after the operation of drive high pressure jar get back to boiler body through the reheat pipeline and in the secondary heating become super high temperature steam, then the operation of drive intermediate pressure jar, can compensate the direct temperature that inserts the intermediate pressure jar from high pressure jar not enough, guarantee that the intermediate pressure jar can operate under the high power in the peak power utilization period.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a thermal power peak shaving system provided in an embodiment of the present invention.
Description of reference numerals: 1. a boiler body; 2. a high pressure cylinder; 3. an intermediate pressure cylinder; 4. a low pressure cylinder; 5. a generator; 6. a third stage high pressure heater; 7. a second stage high pressure heater; 8. a first stage high pressure heater; 9. a main feed pump; 10. a pre-pump; 11. a deaerator; 12. a small steam turbine of a feed pump; 13. a fourth stage low pressure heater; 14. a third stage low pressure heater; 15. a second stage low pressure heater; 16. a first stage low pressure heater; 17. a shaft seal heater; 18. a condensate polishing device; 19. a condensate pump; 20. a condenser; 21. storing the low-temperature molten salt; 22. low temperature molten salt drives the pump; 23. a first heat storage heat exchanger; 24. a second heat storage heat exchanger; 25. storing the high-temperature molten salt; 26. a power supply unit; 27. driving a pump by high-temperature molten salt; 28. a first heat release heat exchanger; 29. a second heat-releasing heat exchanger; 30. an auxiliary heat-release heat exchanger; 31. a third heat-releasing heat exchanger; 32. a fourth heat-release heat exchanger; 33. a deoxygenation water pump; 34. a booster water pump; 35. a third regulating valve; 36. a second regulating valve; 37. a fourth regulating valve; 38. a first regulating valve; 39. a sixth three-way valve; 40. a fifth regulating valve; 41. a sixth regulating valve; 42. a fifth three-way valve; 43. a first three-way valve; 44. a fourth three-way valve; 45. a second three-way valve; 46. a third three-way valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Examples
As shown in fig. 1, the thermal power peak regulation system provided by the present invention includes a thermal power generation subsystem, a peak regulation heat storage subsystem, and a peak regulation heat release subsystem.
The thermal power generation subsystem comprises a boiler body 1, a high-pressure cylinder 2, an intermediate pressure cylinder 3, a low-pressure cylinder 4, a generator 5, a main water feeding pump 9, a front pump 10, a deaerator 11, a water feeding pump small turbine 12, a shaft seal heater 17, a condensed water fine treatment device 18, a condensed water pump 19, a condenser 20, a three-level high-pressure heater and a four-level low-pressure heater, wherein the three-level high-pressure heater and the four-level low-pressure heater are arranged in series. The working medium is heated by the boiler body 1 in sequence and then drives the high pressure cylinder 2 to operate, and then flows back to the boiler body 1 through the reheating pipeline to be heated for the second time and then drives the intermediate pressure cylinder 3 to operate. And high-pressure return pipelines are arranged between the rear-stage high-pressure heater and the front-stage high-pressure heater and at the inlet ends of the first-stage high-pressure heater 8 and the deaerator 11. And low-pressure return pipelines are arranged between the next-stage low-pressure heater and the previous-stage low-pressure heater and between the first-stage low-pressure heater 16 and the inlet end of the condensate pump 19. Three flow passages are arranged in the boiler body 1, the first flow passage is used for supplying steam to the high-pressure cylinder 2, and the second flow passage and the third flow passage are converged at the outlet end and are led into a pipeline for supplying steam to the intermediate-pressure cylinder 3. The reheating pipeline is communicated between the high-pressure cylinder 2 and the boiler body 1, the high-pressure steam pipelines are arranged between the high-pressure cylinder 2 and the third-stage high-pressure heater 6, between the reheating pipeline and the second-stage high-pressure heater 7 and between the intermediate pressure cylinder 3 and the first-stage high-pressure heater 8, the inlet end of the deaerator 11 is communicated with the intermediate pressure cylinder 3, and steam is extracted from the intermediate pressure cylinder 3. The outlet end of the deaerator 11 is sequentially connected with a pre-pump 10 and a main water feeding pump 9, and the main water feeding pump 9 is communicated with the first-stage high-pressure heater 8 to supply water for the high-pressure heater. And a low-pressure steam pipeline is arranged between the four-stage low-pressure heater and the low-pressure cylinder 4. The outlet of the fourth-stage low-pressure heater 13 is communicated with the inlet end of the deaerator 11. The outlet end of the low pressure cylinder 4 is connected with a condenser 20, a condensate pump 19 and a condensate polishing device 18 in sequence, and the condensate output from the condensate polishing device 18 is preheated by the cold side of a shaft seal heater 17 and then input into the first-stage low pressure heater 16. Steam is taken from the outside at the hot side of the shaft seal heater 17, and the steam enters the outlet end of the condenser 20 after the heat is released by the shaft seal heater 17. And a water supply auxiliary branch is further installed at the outlet of the intermediate pressure cylinder 3, a small water supply pump turbine 12 is installed on the water supply auxiliary branch, and the outlet end of the small water supply pump turbine 12 is further communicated with a condenser 20.
The feed water enters the boiler body 1, absorbs heat to high-temperature and high-pressure main steam, then flows into the high-pressure cylinder 2 to expand, and cold reheat steam flowing out from the outlet of the high-pressure cylinder 2 returns to the boiler body 1 to absorb heat to obtain hot reheat steam, and then flows into the intermediate pressure cylinder 3 and the low-pressure cylinder 4 in sequence to expand to do work. The high-pressure cylinder 2, the intermediate-pressure cylinder 3 and the low-pressure cylinder 4 of the steam turbine set are coaxially connected to drive the generator 5 to generate electricity.
Steam is extracted from the high-pressure turbine cylinder 2 and the medium-pressure turbine cylinder 3, and heating steam of the three-stage high-pressure heater and the deaerator 11 and steam supply of the small water-feeding pump turbine 12 are respectively provided. Steam is extracted from the low-pressure cylinder 4, and heating steam of the four-stage low-pressure heater is respectively provided. The condenser 20 condenses the exhaust steam from the turbine low-pressure cylinder 4 into condensed water, collects the condensed water in the hot well, and sends the condensed water to the condensed water fine treatment device 18 by the condensed water pump 19. The exhaust steam of the small turbine 12 of the feed pump is led into a condenser 20, and the make-up water is made up by the condenser 20.
The three-stage high-pressure heater is provided with a built-in steam cooling section and a built-in drainage cooling section, and the four-stage low-pressure heater is only provided with a built-in drainage cooling section. Drainage of the high-pressure heater automatically flows into the deaerator 11 in a step-by-step self-flow mode, drainage of the low-pressure heater automatically flows step by step, and flows into a hot well of the condenser 20 after being collected with drainage of the shaft seal heater 17. The steam source of the gland seal heater 17 is steam turbine gland seal steam.
The condensed water in the hot well of the condenser 20 sequentially passes through a condensed water pump 19, a condensed water fine treatment device 18, a shaft seal heater 17 and a four-stage low-pressure heater and then enters the deaerator 11. Deoxygenated water enters the boiler body 1 from a deoxygenator 11 water supply tank through a pre-pump 10, a main water supply pump 9 and a three-stage high-pressure heater.
The peak-shaving heat storage subsystem comprises a first heat storage heat exchanger 23, a second heat storage heat exchanger 24, a low-temperature molten salt storage tank serving as a low-temperature molten salt storage part 21, a low-temperature molten salt drive pump 22 arranged at the outlet end of the low-temperature molten salt storage tank, an electric heating type high-temperature molten salt storage tank serving as a high-temperature molten salt storage part 25, and a power supply arranged on the high-temperature molten salt storage tank.
The outlet end of the low-temperature molten salt storage part 21 is communicated with the inlet end of the high-temperature molten salt storage part 25. The cold side of the first heat storage heat exchanger 23 is communicated between the high-temperature molten salt storage piece 25 and the low-temperature molten salt storage piece 21, and the hot side of the first heat storage heat exchanger 23 is communicated between the outlet end of the boiler body 1 and the inlet end of the deaerator 11. The cold side of the second heat storage heat exchanger 24 is installed in series between the cold side of the first heat storage heat exchanger 23 and the high-temperature molten salt storage member 25, and the hot side of the second heat storage heat exchanger 24 is installed in series between the hot side of the first heat storage heat exchanger 23 and the boiler body 1. The peak-shaving heat storage subsystem further comprises a heat storage auxiliary branch, one end of the heat storage auxiliary branch is communicated with the reheating pipeline, and the other end of the heat storage auxiliary branch is connected between the hot side of the first heat storage heat exchanger 23 and the hot side of the second heat storage heat exchanger 24 and used for supplementing heat to steam which absorbs heat in the second heat storage heat exchanger 24, and the heating efficiency of the first heat storage heat exchanger 23 to low-temperature molten salt is improved. A first heat storage branch is arranged on an external output pipeline of a first flow channel of the boiler body 1, a second heat storage branch is arranged on an external output pipeline shared by a second flow channel and a third flow channel of the boiler body 1, and the first heat storage branch and the second heat storage branch are combined into a pipeline and then communicated with a hot side of a second heat storage heat exchange piece. A second regulating valve 36 is provided in the first heat accumulating branch to control the flow rate and quantity of steam in the first heat accumulating branch. And a third regulating valve 35 is arranged on the second heat storage branch and used for controlling the flow speed and the flow of steam in the second heat storage branch. A fourth regulating valve 37 is provided in the heat storage auxiliary branch to control the flow rate and quantity of steam in the heat storage auxiliary branch.
In the two-stage heat accumulation peak regulation process, a part of steam is shunted from the outlet of the high-pressure cylinder 2 of the steam turbine, flows into the first heat accumulation heat exchanger 23 to release heat energy, and then is discharged into the deaerator 11. The extraction is controlled by a fourth regulating valve 37.
And a part of steam is introduced from the first flow channel of the main steam pipeline, the second flow channel of the reheat steam pipeline and the third flow channel of the boiler body 1, the steam extraction amount is controlled by a second regulating valve 36 and a third regulating valve 35, the steam is decompressed to the medium pressure, enters the second heat storage heat exchanger 24 to release heat energy, is converged with the extracted steam from the outlet of the high-pressure cylinder 2 of the steam turbine, flows into the first heat storage heat exchanger 23 to further release heat energy, and finally flows into the deaerator 11. This portion of the steam participates in two-stage heat release.
Meanwhile, the low-temperature molten salt driving pump 22 is started to drive the low-temperature molten salt to flow out of the low-temperature molten salt storage tank, and the low-temperature molten salt enters the first heat storage heat exchanger 23 and the second heat storage heat exchanger 24 in sequence to absorb heat energy to be in a high-temperature state and enters the electric heating type high-temperature molten salt storage tank to be stored. The electric heater is arranged in the electric heating type high-temperature molten salt storage tank, and the power supply unit 26 provides electric energy to further heat the high-temperature molten salt. The power supply unit 26 uses surplus power generated by the thermal power plant during the power-use off-peak period. Through heat storage, redundant heat energy generated by a thermal power plant in a power consumption valley period is stored, and generated redundant electric energy is converted into high-temperature heat energy to be stored. The method can realize the improvement of the deep peak regulation capability while ensuring the stable operation of the thermal power plant in the electricity utilization valley period.
The peak-regulating heat-releasing subsystem comprises a low-temperature molten salt storage tank serving as a low-temperature molten salt storage part 21, an electric heating type high-temperature molten salt storage tank serving as a high-temperature molten salt storage part 25, a power supply source arranged on the high-temperature molten salt storage tank, a high-temperature molten salt drive pump 27 arranged at the outlet end of the high-temperature molten salt storage tank, a first heat-releasing heat exchanger 28, a second heat-releasing heat exchanger 29, a steam generator serving as an auxiliary heat-releasing heat exchanger 30, a third heat-releasing heat exchanger 31, a fourth heat-releasing heat exchanger 32, an oxygen-removing water pump 33 and a booster water pump 34.
The cold side of the first heat release heat exchanger 28 is communicated between the inlet of the boiler body 1 and a reheating pipeline, and the hot side inlet end of the first heat release heat exchanger 28 is communicated with the outlet end of the high-temperature molten salt storage part 25. The outlet end of the hot side of the first heat-releasing heat exchanger 28 is divided into two branches by a fifth three-way valve 42, one branch is communicated with the inlet of the hot side of the second heat-releasing heat exchanger 29, and the other branch is communicated with the inlet of the hot side of the auxiliary heat-releasing heat exchanger 30. A first regulating valve 38 is arranged between the reheating pipeline and the cold side of the first heat release heat exchanger 28, and a high-temperature molten salt driving pump 27 is arranged between the outlet end of the high-temperature molten salt storage piece 25 and the first heat release heat exchanger 28. A first temperature sensor is installed at the outlet end of the hot side of the first heat-releasing heat exchanger, a second temperature sensor is installed at the outlet end of the hot side of the second heat-releasing heat exchanger, a third temperature sensor is installed at the outlet end of the hot side of the third heat-releasing heat exchanger, and a fourth temperature sensor is installed at the outlet end of the hot side of the fourth heat-releasing heat exchanger. And (3) installing auxiliary temperature sensors at the hot side inlet ends of the first heat-releasing heat exchanger, the second heat-releasing heat exchanger, the third heat-releasing heat exchanger and the fourth heat-releasing heat exchanger to monitor the high-temperature molten salt temperature at the hot side inlet of different heat-releasing heat exchangers in real time.
The cold side of the second heat-releasing heat exchanger 29 is communicated between the main water-feeding pump 9 and the inlet of the boiler body 1, the hot side inlet end of the second heat-releasing heat exchanger 29 is communicated with the hot side outlet end of the first heat-releasing heat exchanger 28, and the hot side inlet end and the hot side outlet end of the second heat-releasing heat exchanger 29 are also communicated with a first auxiliary branch. A fifth regulating valve 40 is provided on the piping between the main feed water pump 9 and the second heat release heat exchanger 29 to control the flow rate and quantity of feed water into the second heat release heat exchanger 29.
The cold side inlet end of the third heat release heat exchanger 31 is communicated between the multistage low-pressure heaters, the cold side outlet end of the third heat release heat exchanger 31 is communicated with the inlet end of the deaerator 11, the hot side inlet end of the third heat release heat exchanger 31 is communicated with the hot side outlet end of the second heat release heat exchanger 29, and the hot side inlet end and the hot side outlet end of the third heat release heat exchanger 31 are also communicated with a second auxiliary branch. A sixth regulating valve 41 is provided between the third heat release heat exchanger 31 and the low pressure heater to control the flow rate and quantity of the condensed water entering the cold side of the third heat release heat exchanger 31.
The hot side inlet end of the fourth heat release heat exchanger 32 is communicated with the hot side outlet end of the third heat release heat exchanger 31, the hot side outlet end of the fourth heat release heat exchanger 32 is communicated with the inlet end of the low-temperature molten salt storage part 21, and the hot side inlet end and the hot side outlet end of the fourth heat release heat exchanger 32 are also communicated with a third auxiliary branch. The cold side of the fourth heat release heat exchanger 32 is connected with a heat taking pipeline for supplying heat to the outside of the system, and a booster water pump 34 is installed on the heat taking pipeline.
The thermal peaking system includes a first three-way valve 43, a second three-way valve 45, a third three-way valve 46, and a fourth three-way valve 44. The hot side inlet end of the second heat-releasing heat exchanger 29 and the hot side outlet end of the first heat-releasing heat exchanger 28 are respectively communicated with two valve ports of the first three-way valve 43, and the first auxiliary branch is connected to the other valve port of the first three-way valve 43. The hot side inlet end of the third heat-releasing heat exchanger 31 and the hot side outlet end of the second heat-releasing heat exchanger 29 are respectively communicated with two valve ports of the second three-way valve 45, and the second auxiliary branch is connected to the other valve port of the second three-way valve 45. The hot side inlet end of the fourth heat release heat exchanger 32 and the hot side outlet end of the third heat release heat exchanger 31 are respectively communicated with two valve ports of the third three-way valve 46, and the third auxiliary branch is connected to the other valve port of the third three-way valve 46.
The hot side inlet end of the auxiliary heat releasing heat exchanger 30 is communicated with the hot side outlet end of the first heat releasing heat exchanger 28, the hot side outlet end of the auxiliary heat releasing heat exchanger 30 is communicated with the hot side inlet end of the third heat releasing heat exchanger 31, the hot side inlet end of the auxiliary heat releasing heat exchanger 30 and the hot side outlet end thereof are also directly communicated with a fourth auxiliary branch, the cold side inlet end of the auxiliary heat releasing heat exchanger 30 is communicated with the outlet end of the deaerator 11, and the cold side outlet end of the auxiliary heat releasing heat exchanger 30 is communicated with the low-pressure cylinder 4 to supplement medium-temperature steam for the low-pressure cylinder 4. The hot side inlet end of the auxiliary heat release heat exchanger 30 and the hot side outlet end of the first heat release heat exchanger 28 are respectively communicated with two valve ports of a fourth three-way valve 44, and a fourth auxiliary branch is connected to the other valve port of the fourth three-way valve 44. A deoxygenation water pump 33 is installed between the outlet end of the deoxygenator 11 and the cold side inlet end of the auxiliary heat release heat exchanger 30.
And a multi-stage heat release mode is adopted, and the heat energy stored in the high-temperature molten salt is fully utilized.
First stage heat release, heating cold reheat steam:
first, the high temperature molten salt drive pump 27 is activated to drive molten salt from the high temperature molten salt storage tank to flow into the hot side of the first heat release heat exchanger 28 to release thermal energy. Meanwhile, a steam exhaust (cold reheat steam) of the high-pressure turbine cylinder 2 is led out, the steam extraction amount is controlled by the first regulating valve 38, the steam flows into the cold side of the first heat release heat exchanger 28 to absorb heat energy, and the steam is in a hot reheat steam state, is converged with the hot reheat steam flowing out of the boiler body 1, is converged into a hot reheat steam main pipeline, and flows into the intermediate pressure cylinder 3 to expand and do work. If the Leng Zaire steam is heated by the first heat release heat exchanger 28 and does not reach the temperature of the hot reheat steam, the steam flows into the boiler body 1 along the pipeline to absorb heat further, and then is collected into the main hot reheat steam pipeline. The flow of the vapor absorbing heat in the first heat release heat exchanger 28 is controlled by a sixth three-way valve 39. The high temperature heat energy of the molten salt provides a part of reheat, and the top load capacity in the peak period of power utilization is improved.
Second-stage heat release:
the high temperature molten salt to complete the first stage heat release is higher than the temperature of Leng Zaire steam. The high-temperature molten salt that flows out from first heat accumulation heat exchanger 23 divide into two strands, is used for heating feedwater and deaerated water respectively to reduce high pressure cylinder 2, 3 extraction steams of intermediate pressure cylinder, improve steam turbine operating stability, improve the turbine group and exert oneself and heat deaerated water to middling pressure steam, improve 4 work of low pressure cylinder.
Heating and water supply: a flow of high-temperature molten salt flows into the hot side of the second heat release heat exchanger 29 to release heat energy. Meanwhile, a strand of deoxygenated water is led from between the main feed water pump 9 and the first-stage high-pressure heater 8, flows into the cold side of the second heat release heat exchanger 29 to absorb heat energy to reach the feed water temperature, and then enters the boiler body 1 to participate in the heat absorption process.
Heating deoxygenated water: the other strand of high-temperature molten salt flows into the hot side of the steam generator serving as the auxiliary energy release heat exchanger to release heat energy; meanwhile, a strand of deoxygenated water is led out from the position between the deoxygenator 11 and the pre-pump 10, pumped into the cold side of the steam generator through the deoxygenating water pump 33 to absorb heat energy to be vaporized, and the vaporized medium-pressure superheated steam is converged with main steam at the inlet of the low-pressure cylinder 4 along a pipeline and enters the low-pressure cylinder 4 to be expanded to do work.
If the system does not require molten salt to provide both portions of the heat energy or the demand for that portion is reduced, all or part is passed through the secondary heat rejection heat exchanger 29 and the steam generator via the secondary branch. The molten salt flow rate flowing through the auxiliary branch and the heat exchanger is controlled by the cooperation of a fifth three-way valve 42, a first three-way valve 43 and a fourth three-way valve 44 respectively.
Third-stage heat release:
the molten salt which completes the second stage heat release can be used for heating condensed water so as to reduce the steam extraction amount of the low-pressure cylinder 4 and provide part of heat energy required by the low-pressure heater. After the two molten salts which are subjected to the second-stage heat release are collected, the two molten salts flow into the hot side of the third heat storage heater to release heat energy. In order to prevent the molten salt from solidifying, only part of the condensed water flowing through the first two stages of low-pressure heaters is heated.
And heating partial condensed water of the first two stages of low-pressure heaters, leading out a strand of condensed water from a node between the second stage low-pressure heater 15 and the third stage low-pressure heater 14, allowing the condensed water to enter a cold side of the third heat release heater to absorb heat energy, and allowing the condensed water to enter the deaerator 11 after being heated. The amount of the condensed water led out is controlled by a sixth regulating valve 41.
If the molten salt is not needed to provide the part of heat energy or the demand for the part of heat energy is reduced, all or part of the molten salt passes through the third heat storage heater through the second auxiliary branch, and the flow rate of the molten salt flowing through the third heat storage heat exchanger and the second auxiliary branch is controlled by the second three-way valve 45.
Fourth stage heat release:
the molten salt after the heat release of the first three stages still has a part of low-grade heat energy, and the waste heat in the molten salt is used for supplying heat, but the temperature of the molten salt at the outlet of the fourth heat release heat exchanger 32 is kept higher than the solidification temperature of the molten salt. If the heat supply demand increases, the molten salt can partially or completely pass through the second heat release heat exchanger 29, the auxiliary heat release heat exchanger 30 and the third heat release heat exchanger 31 through the auxiliary branch to reserve more available heat energy in the fourth heat release heat exchanger 32.
If there is no or a reduced demand for useful heat, the molten salt passes over the fourth heat rejection heat exchanger 32, in whole or in part, through the third auxiliary branch, and the flow of molten salt in the fourth heat rejection heat exchanger 32 and the third auxiliary branch is controlled by the third three-way valve 46.
The above-described four-stage heat release process may be performed alone or simultaneously with the second to fourth-stage heat release.
When the thermal power peak regulating system is used for heat release operation, the molten salt temperatures of the outlet ends of the hot side of the first heat release heat exchanger 28, the second heat release heat exchanger 29, the third heat release heat exchanger 31 and the fourth heat release heat exchanger 32 are respectively obtained in real time by utilizing the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor and are respectively recorded as a first molten salt temperature, a second molten salt temperature, a third molten salt temperature and a fourth molten salt temperature.
And judging whether the temperature of the first molten salt is greater than a first set temperature value, if the temperature of the first molten salt is not greater than the first set temperature value, increasing the input quantity of the high-temperature molten salt at the hot side of the first heat release heat exchanger 28 by increasing the output power of the high-temperature molten salt increase drive pump, and/or reducing the input quantity of the steam at the cold side of the first heat release heat exchanger 28 by decreasing the opening degree of the first regulating valve 38.
If the first molten salt temperature is higher than the first set temperature value, whether the second molten salt temperature is higher than the second set temperature value is judged, if the second molten salt temperature is not higher than the second set temperature value, the flow of the high-temperature molten salt in the first auxiliary branch and the fourth auxiliary branch is reduced by reducing the opening degree of the valve port of the first three-way valve 43 and/or the fourth three-way valve 44 communicated with the corresponding auxiliary branch, so that the flow of the high-temperature molten salt flowing through the hot side of the heat release heat exchanger is increased, and/or the opening degree of the fifth regulating valve 40 is reduced, the hydraulic quality input quantity at the cold side of the second heat release heat exchanger 29 is reduced, the output power of the oxygen removal water pump 33 is reduced, and the oxygen removal water input quantity at the cold side of the auxiliary heat release heat exchanger 30 is reduced.
If the second molten salt temperature is higher than the second set temperature value, judging whether the third molten salt temperature is higher than a third set temperature value, if the third molten salt temperature is not higher than the third set temperature value, reducing the flow of the high-temperature molten salt in the second auxiliary branch to increase the molten salt flow at the hot side of the third heat release heat exchanger 31 in the process by reducing the opening degree of a valve port communicated with the second auxiliary branch by a second three-way valve 45, and/or reducing the input quantity of the cold side condensate water of the third heat release heat exchanger 31 by reducing the opening degree of a sixth regulating valve 41;
if the third molten salt temperature is higher than the third set temperature value, whether the fourth molten salt temperature is higher than the fourth set temperature value is judged, and if the fourth molten salt temperature is not higher than the fourth set temperature value, the opening degree of a valve port communicated with the third auxiliary branch through the third three-way valve 46 is reduced, so that the flow of the high-temperature molten salt in the third auxiliary branch is reduced, the flow of the high-temperature molten salt at the hot side of the fourth heat release heat exchanger 32 is increased, the output work of the booster water pump 34 is/are reduced, and the heat demand of the cold side of the fourth heat release heat exchanger 32 is reduced.
The fourth set temperature is set to be 30-50 ℃ higher than the solidification temperature of the molten salt, so that the molten salt is prevented from being solidified. The first set temperature is far higher than the feed water temperature and the steam temperature at the inlet of the low-pressure cylinder 4, the second set temperature is far higher than the deaerated water temperature, and the third set temperature is far higher than the heat supply temperature.
And setting a first set temperature, a second set temperature, a third set temperature and a fourth set temperature corresponding to the first heat-releasing heat exchanger, the second heat-releasing heat exchanger, the third heat-releasing heat exchanger and the fourth heat-releasing heat exchanger according to the actual running state of the system. Controlling the input amount of Wen Rongyan hot side height in the first heat release heat exchanger and/or the input amount of cold side steam in the first heat release heat exchanger according to a first set temperature, ensuring that the temperature of the first molten salt is higher than a first set temperature value, and controlling the heat exchange amount of the high-temperature molten salt in the first heat release heat exchanger; controlling the amount of high-temperature molten salt which directly passes through the second heat release heat exchanger without heat exchange through the first auxiliary branch according to a second set temperature, namely controlling the input amount of high-temperature molten salt at the hot side of the second heat release heat exchanger and/or the input amount of water working medium at the cold side of the second heat release heat exchanger, ensuring that the temperature of the second molten salt is greater than a second set temperature value, and further controlling the heat exchange amount of the high-temperature molten salt in the second heat release heat exchanger; controlling the amount of high-temperature molten salt directly crossing the third heat release heat exchanger through the second auxiliary branch according to a third set temperature, namely the input amount of high-temperature molten salt on the hot side of the third heat release heat exchanger and/or the input amount of water working medium on the cold side of the third heat release heat exchanger, and ensuring that the temperature of the third molten salt is always greater than the third set temperature value, so as to control the heat exchange amount of the high-temperature molten salt in the third heat release heat exchanger; and controlling the amount of the high-temperature molten salt which does not exchange heat when passing through the fourth heat release heat exchanger through the third auxiliary branch according to a fourth set temperature, namely controlling the input amount of the high-temperature molten salt at the hot side of the fourth heat release heat exchanger and/or the input amount of the water working medium at the cold side of the fourth heat release heat exchanger, so as to ensure that the temperature of the fourth molten salt is always greater than the fourth set temperature value, thereby controlling the heat exchange amount of the high-temperature molten salt in the fourth heat release heat exchanger. The trend and the flow of the high-temperature molten salt are regulated and controlled according to the first set temperature, the second set temperature, the third set temperature and the fourth set temperature, so that the heat exchange quantity of the high-temperature molten salt in different heat release heat exchangers is controlled, the required heat in the power generation system is regulated and controlled, the temperature compensation quantity of steam in the power generation system can be accurately controlled, the heat storage and release efficiency of the high-temperature molten salt is improved, and the operating efficiency of a thermal power peak regulation system is improved.
The high-temperature molten salt uses multi-element mixed inorganic salt, and the use temperature range is 150-800 ℃. In the heat storage process, an electric heater is used for further heating the molten salt, the temperature of the molten salt is controlled to be 30-50 ℃ lower than the upper temperature limit, and the molten salt is prevented from dissociating. In the heat release process, the temperature of the molten salt is controlled to be higher than the lower limit temperature by 30-50 ℃ to prevent the molten salt from solidifying. Each part in the system is provided with a flowmeter and a temperature/pressure sensor so as to match the heat storage/release process. The outlets of two channels of each stage of heat exchanger are provided with a temperature measuring device, a pressure measuring device and a flow measuring device, which are not drawn in the figure.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. The utility model provides a thermal power peak regulation system which characterized in that, the intercommunication has the reheat pipeline between high-pressure cylinder (2) and boiler body (1), includes:
the device comprises a high-temperature molten salt storage piece (25) and a low-temperature molten salt storage piece (21), wherein the outlet end of the low-temperature molten salt storage piece (21) is communicated with the inlet end of the high-temperature molten salt storage piece (25);
the cold side of the first heat storage heat exchanger (23) is communicated between the high-temperature molten salt storage piece (25) and the low-temperature molten salt storage piece (21), and the hot side of the first heat storage heat exchanger is communicated between the outlet end of the boiler body (1) and the inlet end of the deaerator (11);
the cold side of the first heat release heat exchanger (28) is communicated between the inlet of the boiler body (1) and the reheating pipeline, the hot side inlet end of the first heat release heat exchanger is communicated with the outlet end of the high-temperature molten salt storage piece (25), and a first temperature sensor is mounted at the hot side outlet end of the first heat release heat exchanger;
the cold side of the second heat release heat exchanger (29) is communicated between the main water feeding pump (9) and the inlet of the boiler body (1), the hot side inlet end of the second heat release heat exchanger is communicated with the hot side outlet end of the first heat release heat exchanger (28), the hot side inlet end of the second heat release heat exchanger is also communicated with the hot side outlet end of the first heat release heat exchanger to form a first auxiliary branch, and a second temperature sensor is mounted at the hot side outlet end of the second heat release heat exchanger;
a cold side inlet end of the third heat release heat exchanger (31) is communicated between the multistage low-pressure heaters, a cold side outlet end of the third heat release heat exchanger is communicated with an inlet end of the deaerator (11), a hot side inlet end of the third heat release heat exchanger is communicated with a hot side outlet end of the second heat release heat exchanger (29), a hot side inlet end of the third heat release heat exchanger is also communicated with a second auxiliary branch, and a third temperature sensor is mounted at the hot side outlet end of the third heat release heat exchanger;
a hot side inlet end of the fourth heat release heat exchanger (32) is communicated with a hot side outlet end of the third heat release heat exchanger (31), a hot side outlet end of the fourth heat release heat exchanger is communicated with an inlet end of the low-temperature molten salt storage piece (21), a hot side inlet end of the fourth heat release heat exchanger is also communicated with a hot side outlet end of the third heat release heat exchanger, and a fourth temperature sensor is installed at the hot side outlet end of the fourth heat release heat exchanger;
when the thermal power peak regulating system is used for heat release operation, the molten salt temperatures of the outlet ends of the hot side of the first heat release heat exchanger (28), the second heat release heat exchanger (29), the third heat release heat exchanger (31) and the fourth heat release heat exchanger (32) are respectively obtained in real time by utilizing the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor and are respectively recorded as a first molten salt temperature, a second molten salt temperature, a third molten salt temperature and a fourth molten salt temperature;
judging whether the temperature of the first molten salt is greater than a first set temperature value, if the temperature of the first molten salt is not greater than the first set temperature value, increasing the input quantity of high-temperature molten salt at the hot side of the first heat release heat exchanger (28), and/or reducing the input quantity of steam at the cold side of the first heat release heat exchanger (28);
if the first molten salt temperature is greater than the first set temperature value, judging whether the second molten salt temperature is greater than a second set temperature value, and if the second molten salt temperature is not greater than the second set temperature value, reducing the flow of high-temperature molten salt in the first auxiliary branch and/or reducing the input quantity of a cold-side working medium of a second heat release heat exchanger (29);
if the second molten salt temperature is higher than a second set temperature value, judging whether the third molten salt temperature is higher than a third set temperature value, and if the third molten salt temperature is not higher than the third set temperature value, reducing the flow of high-temperature molten salt in the second auxiliary branch and/or reducing the input quantity of a water working medium on the cold side of the third heat release heat exchanger (31);
if the third molten salt temperature is higher than the third set temperature value, whether the fourth molten salt temperature is higher than a fourth set temperature value or not is judged, and if the fourth molten salt temperature is not higher than the fourth set temperature value, the flow of the high-temperature molten salt in the third auxiliary branch is reduced, and/or the input quantity of the water working medium on the cold side of the fourth heat release heat exchanger (32) is reduced.
2. The thermal power peak regulating system according to claim 1, wherein a first regulating valve (38) is installed between the reheating pipeline and the cold side of the first heat release heat exchanger (28), and a high-temperature molten salt driven pump (27) is installed between the outlet end of the high-temperature molten salt storage piece (25) and the first heat release heat exchanger (28).
3. A thermal power peaking system according to claim 1 or 2, characterized in that the thermal power peaking system further includes at least one of a first three-way valve (43), a second three-way valve (45), and a third three-way valve (46);
the hot side inlet end of the second heat release heat exchanger (29) and the hot side outlet end of the first heat release heat exchanger (28) are respectively communicated with two valve ports of the first three-way valve (43), and the first auxiliary branch is connected to the other valve port of the first three-way valve (43);
the hot side inlet end of the third heat release heat exchanger (31) and the hot side outlet end of the second heat release heat exchanger (29) are respectively communicated with two valve ports of the second three-way valve (45), and the second auxiliary branch is connected to the other valve port of the second three-way valve (45);
and the hot side inlet end of the fourth heat release heat exchanger (32) and the hot side outlet end of the third heat release heat exchanger (31) are respectively communicated with two valve ports of the third three-way valve (46), and the third auxiliary branch is connected to the other valve port of the third three-way valve (46).
4. The thermal power peak regulating system according to any one of claims 1 to 3, characterized by further comprising an auxiliary heat release heat exchanger (30), wherein a hot side inlet end of the auxiliary heat release heat exchanger is communicated with a hot side outlet end of the first heat release heat exchanger (28), a hot side outlet end of the auxiliary heat release heat exchanger is communicated with a hot side inlet end of the third heat release heat exchanger (31), a fourth auxiliary branch is further directly communicated with the hot side inlet end of the auxiliary heat release heat exchanger, a cold side inlet end of the auxiliary heat release heat exchanger is communicated with an outlet end of the deaerator (11), and a cold side outlet end of the auxiliary heat release heat exchanger is communicated with the low pressure cylinder (4).
5. The thermal power peaking system of claim 4, further comprising a fourth three-way valve (44), wherein a hot-side inlet end of the auxiliary heat release heat exchanger (30) and a hot-side outlet end of the first heat release heat exchanger (28) are respectively communicated with two valve ports of the fourth three-way valve (44), and the fourth auxiliary branch is connected to another valve port of the fourth three-way valve (44).
6. The thermal power peak shaving system according to claim 4 or 5, characterized in that a deoxygenation water pump (33) is installed between the outlet end of the deoxygenator (11) and the cold side inlet end of the auxiliary heat release heat exchanger (30).
7. The thermal power peak shaving system according to any one of claims 1 to 6, further comprising a second heat storage heat exchanger (24) having a cold side installed in series between the cold side of the first heat storage heat exchanger (23) and the high temperature molten salt storage (25) and a hot side installed in series between the hot side of the first heat storage heat exchanger (23) and the boiler body (1).
8. The thermal power peak shaving system according to claim 7, further comprising a heat storage auxiliary branch, one end of which is communicated with the reheating pipeline, and the other end of which is connected between the hot side of the first heat storage heat exchanger (23) and the hot side of the second heat storage heat exchanger (24).
9. The thermal power peak regulating system according to any one of claims 1 to 8, characterized in that a working medium is heated by the boiler body (1) in sequence to drive the high pressure cylinder (2) to operate, and then flows back to the boiler body (1) through a reheating pipeline to be heated for a second time to drive the intermediate pressure cylinder (3) to operate.
10. The thermal power peak regulating system according to any one of claims 1 to 9, wherein a water supply auxiliary branch is further installed at the outlet of the intermediate pressure cylinder (3), a small water supply pump turbine (12) is installed on the water supply auxiliary branch, the outlet end of the small water supply pump turbine (12) is communicated with a condenser (20), and the small water supply pump turbine (12) is in driving connection with the main water supply pump (9).
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117489428A (en) * 2023-11-02 2024-02-02 华北电力大学 Energy storage and peak shaving system and method integrating molten salt heat storage and steam energy accumulator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5860191A (en) * 1981-10-05 1983-04-09 Mitsubishi Heavy Ind Ltd Method for charging and extracting of molten salt to and from heat exchange device
US20120151926A1 (en) * 2010-12-20 2012-06-21 Invensys Systems Inc. Feedwater Heater Control System for Improved Rankine Cycle Power Plant Efficiency
WO2018233024A1 (en) * 2017-06-22 2018-12-27 赫普热力发展有限公司 Thermoelectric decoupling peak load regulating system
CN110006026A (en) * 2019-04-18 2019-07-12 北京工业大学 A kind of thermal power plant's depth peak regulation system
CN113295033A (en) * 2021-04-28 2021-08-24 东南大学 Molten salt heat storage boiler with built-in multistage heat exchanger

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5860191A (en) * 1981-10-05 1983-04-09 Mitsubishi Heavy Ind Ltd Method for charging and extracting of molten salt to and from heat exchange device
US20120151926A1 (en) * 2010-12-20 2012-06-21 Invensys Systems Inc. Feedwater Heater Control System for Improved Rankine Cycle Power Plant Efficiency
WO2018233024A1 (en) * 2017-06-22 2018-12-27 赫普热力发展有限公司 Thermoelectric decoupling peak load regulating system
CN110006026A (en) * 2019-04-18 2019-07-12 北京工业大学 A kind of thermal power plant's depth peak regulation system
CN113295033A (en) * 2021-04-28 2021-08-24 东南大学 Molten salt heat storage boiler with built-in multistage heat exchanger

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117489428A (en) * 2023-11-02 2024-02-02 华北电力大学 Energy storage and peak shaving system and method integrating molten salt heat storage and steam energy accumulator

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