CN114251241A - Cooperative heat storage and peak regulation system and method coupled with geothermal energy - Google Patents
Cooperative heat storage and peak regulation system and method coupled with geothermal energy Download PDFInfo
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- CN114251241A CN114251241A CN202111525784.6A CN202111525784A CN114251241A CN 114251241 A CN114251241 A CN 114251241A CN 202111525784 A CN202111525784 A CN 202111525784A CN 114251241 A CN114251241 A CN 114251241A
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- 238000005338 heat storage Methods 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000004146 energy storage Methods 0.000 claims abstract description 14
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- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 6
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 3
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- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 238000005482 strain hardening Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract 1
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 239000002918 waste heat Substances 0.000 abstract 1
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- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
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- 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
- F01D13/00—Combinations of two or more machines or engines
- F01D13/02—Working-fluid interconnection of machines or engines
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- 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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- 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 discloses a cooperative heat storage and peak regulation system and method coupled with geothermal energy. The device includes high temperature heat storage jar, low temperature heat storage jar, thermal power generating set energy memory and geothermol power energy memory, thermal power generating set energy memory includes high temperature heat storage heat exchanger, exothermic heat exchanger, feed pump, dredge pump, oxygen-eliminating device, steam turbine high pressure jar, steam turbine intermediate pressure jar, well low pressure jar communicating pipe and steam turbine low pressure jar. The geothermal energy storage device comprises a geothermal steam generation system and a low-temperature heat storage heat exchanger, and the heat of a working medium of the geothermal steam generation system and the waste heat of reheated steam are stored in a heat storage tank through the synergistic effect of coupling of a steam turbine set and geothermal energy for supplying a steam turbine to do work, so that the energy conservation and consumption reduction of the thermal power generator set are realized, the peak regulation flexibility of the thermal power generator set is improved, the geothermal energy of clean energy is fully utilized, and the economical efficiency of the set is improved.
Description
Technical Field
The invention belongs to the technical field of heat storage of a steam turbine, and relates to a cooperative heat storage and peak regulation system and method coupled with geothermal energy.
Background
Along with the change of a power supply structure of a power grid, the capacity of a new energy source machine assembling machine is improved year by year, a clean energy source generating set cannot completely meet the safety and stability requirements of the power grid at present, and a thermal generating set is required to carry out auxiliary peak shaving. The geothermal energy output heat is relatively stable, the heat can be continuously output to the heat storage device, the long-term safe and stable operation of the system can be guaranteed, and how to cooperatively operate the geothermal energy and the heat storage peak shaving system of the thermal power generator set so as to reduce the fuel consumption and reduce the carbon emission is the problem which is firstly solved by utilizing clean energy to enhance the flexibility of the thermal power generator set and assisting the heat storage peak shaving of the power generator set at present.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a cooperative heat storage and peak regulation system and method coupled with geothermal energy.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention provides a cooperative heat storage peak shaving system coupled with geothermal energy, which comprises a high-temperature heat storage tank, a low-temperature heat storage tank, a thermal power generator set energy storage device and a geothermal energy storage device, wherein the thermal power generator set energy storage device comprises a high-temperature heat storage heat exchanger, a heat release heat exchanger, a water feed pump, a dredging pump, a deaerator, a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder and a steam turbine low-pressure cylinder;
the high-pressure steam turbine cylinder, the medium-pressure steam turbine cylinder and the low-pressure steam turbine cylinder are coaxially connected, superheated steam enters the high-pressure steam turbine cylinder to do work, the reheated steam is divided into two paths, one path of the reheated steam enters the medium-pressure steam turbine cylinder to do work, and steam discharged by the medium-pressure steam turbine cylinder enters the low-pressure steam turbine cylinder; the other path of the water enters a high-temperature heat storage heat exchanger for heat exchange, then is changed into water, enters a deaerator together with external condensed water, part of the feed water in the deaerator is shunted to a feed pump, the other part of the feed water in the deaerator is subjected to heat exchange through a heat release heat exchanger after being pressurized by a dredge pump, and finally enters a low-pressure cylinder of a steam turbine for acting;
the geothermal energy storage device comprises a geothermal steam generation system and a low-temperature heat storage heat exchanger, wherein a working medium of the geothermal steam generation system returns to the geothermal steam generation system after heat exchange of the low-temperature heat storage heat exchanger;
the molten salt input end of the high-temperature heat storage heat exchanger is connected with the molten salt output end of the low-temperature heat storage heat exchanger, the molten salt output end of the high-temperature heat storage heat exchanger is connected with the high-temperature heat storage tank, and the molten salt input end of the low-temperature heat storage heat exchanger is connected with the low-temperature heat storage tank;
the fused salt input end of the heat release heat exchanger is connected with the high-temperature heat storage tank, and the fused salt output end of the heat release heat exchanger is connected with the low-temperature heat storage tank.
Preferably, a steam pipeline between the turbine intermediate pressure cylinder and the turbine low pressure cylinder is provided with an intermediate and low pressure cylinder communicating pipe.
Preferably, a high-temperature molten salt pump is arranged between the heat-releasing heat exchanger and the high-temperature heat storage tank.
Preferably, a low-temperature molten salt pump is arranged between the low-temperature heat storage heat exchanger and the low-temperature heat storage tank.
Preferably, an auxiliary heat source control valve is arranged between the high-temperature heat storage heat exchanger and the reheat steam outlet.
A cooperative heat storage and peak regulation method coupled with geothermal energy by utilizing the system comprises the following steps:
enabling the superheated steam to enter a high-pressure cylinder of a steam turbine to do work;
dividing the reheated steam into two paths, enabling one path of reheated steam to enter a steam turbine intermediate pressure cylinder to do work, and enabling exhaust steam of the steam turbine intermediate pressure cylinder to enter a steam turbine low pressure cylinder to do work through a medium and low pressure cylinder communicating pipe; enabling the other path of reheated steam to enter a high-temperature heat storage heat exchanger, simultaneously enabling low-temperature molten salt in the low-temperature heat storage tank to be conveyed to the heat storage heat exchanger for heat exchange, enabling the molten salt after heat exchange to enter the high-temperature heat storage heat exchanger for heat exchange with the reheated steam entering the high-temperature heat storage heat exchanger, enabling the reheated steam after heat exchange to enter a deaerator, and converting the low-temperature molten salt after heat exchange into hot molten salt to be stored in the high-temperature heat storage tank;
the hot working medium generated by the geothermal steam generation system is conveyed to the low-temperature heat storage heat exchanger, the low-temperature molten salt in the low-temperature heat storage tank is conveyed to the heat storage heat exchanger to exchange heat with the hot working medium generated by the hot steam generation system entering the low-temperature heat storage heat exchanger, the hot working medium after heat exchange is converted into a cold working medium to return to the hot steam generation system, and the low-temperature molten salt after heat exchange is subjected to heat exchange with the reheated steam in the high-temperature heat storage heat exchanger again to be converted into hot molten salt to be stored in the high-temperature heat storage tank;
the method comprises the steps of pressurizing feed water in a deaerator by a dredge pump, conveying the feed water to a heat release heat exchanger, conveying hot molten salt in a high-temperature heat storage tank to the heat release heat exchanger, exchanging heat with the feed water of the deaerator in the heat release heat exchanger, returning the low-temperature molten salt subjected to heat exchange to a low-temperature heat storage tank, converting feed water heat exchange into high-temperature steam, introducing the high-temperature steam into a medium-low pressure cylinder communicating pipe, mixing the high-temperature steam with exhaust steam of a medium pressure cylinder of a steam turbine, and then introducing the high-temperature steam into a low pressure cylinder of the steam turbine to do work.
Preferably, when the thermal power generator unit is subjected to a peak shaving instruction of rapid load increase, the auxiliary heat source control valve is closed, the dredging pump and the molten salt pump are controlled, the steam flow entering the communication pipe of the medium-low pressure cylinder is increased, the reheated steam directly enters the low pressure cylinder of the steam turbine to do work, the steam flow entering the low pressure cylinder of the steam turbine is rapidly increased, and the load of the thermal power generator unit is rapidly increased.
Preferably, when the thermal power generator unit is subjected to a peak shaving instruction of quickly reducing the load, the opening of the auxiliary heat source control valve is increased, and the dredging pump and the molten salt pump are controlled to reduce the steam flow entering the communication pipe of the medium-low pressure cylinder, so that the steam flow entering the low pressure cylinder of the steam turbine is quickly reduced, and the load of the thermal power generator unit is quickly reduced.
Preferably, the molten salt in the high-temperature heat storage tank and the low-temperature heat storage tank is NaNO3、KNO3、Ca(NO3)2、Na2CO3、K2CO3One or more of NaCl and KCl.
Compared with the prior art, the invention has the following beneficial effects:
the device is connected with a geothermal steam generation system in a heat storage peak regulation system of the thermal power generator set, and geothermal energy is stored in a heat storage tank through a low-temperature heat storage heat exchanger and is supplied to a steam turbine set to do work. The device has the advantages that the cooperative operation of geothermal energy and a heat storage peak regulation system of the thermal power generator set and the full utilization of geothermal energy are realized, the fuel consumption and carbon emission of the thermal power generator set are reduced, the peak regulation flexibility of the power generator set is improved, the economy of the thermal power generator set is improved, the device is simple, the modification cost is low, and the device is an innovative technology for energy conservation and emission reduction of the thermal power generator set system.
The geothermal energy is introduced into the thermal power generating set system, the steam turbine set system and the geothermal steam generating system are coupled and cooperated, the geothermal energy and the heat of reheated steam are stored in the heat storage tank to be supplied to the steam turbine set to do work, the geothermal energy is fully utilized, the fuel consumption and carbon emission of the thermal power generating set are reduced, the flexibility of peak regulation of the power generating set is improved, the economy of the thermal power generating set is improved, the operation is simple, the principle is clear, and the energy-saving and emission-reducing innovative technology of coupling the geothermal energy and the energy storage device of the thermal power generating set is provided.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a cooperative heat storage and peak shaving system coupled with geothermal energy according to the present invention.
Wherein: 1-a high-temperature heat storage tank, 2-a low-temperature heat storage tank, 3-a high-temperature heat storage heat exchanger, 4-a heat release heat exchanger, 5-a low-temperature heat storage heat exchanger, 6-a low-temperature molten salt pump, 7-a geothermal steam generation system, 8-a high-temperature molten salt pump, 9-a water supply pump, 10-a dredging pump, 11-a deaerator, 12-a steam turbine high-pressure cylinder, 13-a steam turbine middle-pressure cylinder, 14-a middle-low pressure cylinder communicating pipe, 15-a steam turbine low-pressure cylinder and 16-an auxiliary heat source control valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 by those skilled in the art according to specific situations.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the invention provides a cooperative heat storage peak shaving system coupled with geothermal energy, which comprises a high-temperature heat storage tank 1, a low-temperature heat storage tank 2, a high-temperature molten salt pump 8, a low-temperature molten salt pump 6, a thermal power generating unit energy storage device and a geothermal energy storage device, wherein the thermal power generating unit energy storage device comprises a high-temperature heat storage heat exchanger 3, a heat release heat exchanger 4, a water feed pump 9, a dredge pump 10, a deaerator 11, a steam turbine high-pressure cylinder 12, a steam turbine medium-pressure cylinder 13, a medium-low pressure cylinder communicating pipe 14, a steam turbine low-pressure cylinder 15 and an auxiliary heat source control valve 16;
the high-pressure turbine cylinder 12, the intermediate-pressure turbine cylinder 13 and the low-pressure turbine cylinder 15 are coaxially connected, superheated steam enters the high-pressure turbine cylinder 12 to do work, the reheated steam is divided into two paths, one path of the reheated steam enters the intermediate-pressure turbine cylinder 13 to do work, and exhaust steam of the intermediate-pressure turbine cylinder 13 enters the low-pressure turbine cylinder 15 through the intermediate-pressure and low-pressure turbine cylinder communicating pipe 14; the other path of the water enters the high-temperature heat storage heat exchanger 3 through the auxiliary heat source control valve 16 for heat exchange and then enters the deaerator 11, the water pump 9 pumps the water into the deaerator 11, the feed water in the deaerator 11 is pressurized through the dredging pump 10 and then exchanges heat through the heat release heat exchanger 4, and finally the feed water enters the low-pressure cylinder 15 of the steam turbine through the middle-low pressure cylinder communicating pipe 14;
the geothermal energy storage device comprises a geothermal steam generation system 7 and a low-temperature heat storage heat exchanger 5, wherein a working medium of the geothermal steam generation system 7 returns to the geothermal steam generation system 7 after heat exchange of the low-temperature heat storage heat exchanger 5;
the molten salt input end of the high-temperature heat storage heat exchanger 3 is connected with the molten salt output end of the low-temperature heat storage heat exchanger 5, the molten salt output end of the high-temperature heat storage heat exchanger 3 is connected with the high-temperature heat storage tank 1, the molten salt input end of the low-temperature heat storage heat exchanger 5 is connected with the low-temperature heat storage tank 2, and a low-temperature molten salt pump 6 is arranged between the low-temperature heat storage heat exchanger 5 and the low-temperature heat storage tank 2;
the fused salt input end of the heat release heat exchanger 4 is connected with the high-temperature heat storage tank 1, a high-temperature fused salt pump 8 is arranged between the heat release heat exchanger 4 and the high-temperature heat storage tank 1, and the fused salt output end of the heat release heat exchanger 4 is connected with the low-temperature heat storage tank 2.
The superheated steam enters a high-pressure cylinder 12 of the steam turbine to do work;
the reheat steam is divided into two paths, wherein one path of reheat steam enters the turbine intermediate pressure cylinder 13 to do work, and then the exhaust steam of the turbine intermediate pressure cylinder 13 enters the turbine low pressure cylinder 15 to do work through the intermediate pressure cylinder communicating pipe 14; the other path of reheated steam enters the high-temperature heat storage heat exchanger 3 through the auxiliary heat source control valve 16. Meanwhile, the low-temperature molten salt pump 6 pumps the low-temperature molten salt in the low-temperature heat storage tank 2 to the heat storage heat exchanger 5 for heat exchange, then the molten salt after heat exchange enters the high-temperature heat storage heat exchanger 3 for heat exchange with the reheated steam entering the high-temperature heat storage heat exchanger 3, the reheated steam after heat exchange enters the deaerator 11, and the low-temperature molten salt after heat exchange is changed into hot molten salt to be stored in the high-temperature heat storage tank 1;
the hot working medium generated by the geothermal steam generating system 7 enters the low-temperature heat storage heat exchanger 5, meanwhile, the low-temperature molten salt pump 6 pumps the low-temperature molten salt in the low-temperature heat storage tank 2 to the heat storage heat exchanger 5 to exchange heat with the hot working medium generated by the hot steam generating system 7 entering the low-temperature heat storage heat exchanger 5, and the hot working medium after heat exchange is converted into a cold working medium to return to the hot steam generating system 7. The low-temperature molten salt after heat exchange exchanges heat with the reheated steam in the high-temperature heat storage heat exchanger 3 through the high-temperature heat storage heat exchanger 3, and is changed into hot molten salt to be stored in the high-temperature heat storage tank 1;
one part of the feed water in the deaerator 11 is shunted to the feed pump 9, and the other part of the deaerator 11 is pressurized by the dredge pump 10 and then conveyed to the heat release heat exchanger 4. Meanwhile, the high-temperature molten salt pump 8 pumps the hot molten salt in the high-temperature heat storage tank 1 into the heat release heat exchanger 4, and the hot molten salt exchanges heat with the feed water of the deaerator 11 in the heat release heat exchanger 4 and then returns to the low-temperature heat storage tank 2. At this time, the feed water of the deaerator 11 is changed into high-temperature steam after heat exchange, and the high-temperature steam enters the medium and low pressure cylinder communicating pipe 14, is mixed with the exhaust steam of the turbine medium pressure cylinder 13, and then enters the turbine low pressure cylinder 15 to do work.
When the thermal power generator unit is subjected to a peak shaving instruction of rapid load increase, the auxiliary heat source control valve 16 is closed, the dredge pump 10 and the molten salt pump 8 are controlled, the steam flow entering the middle and low pressure cylinder communicating pipe 14 is increased, simultaneously, reheated steam directly enters the steam turbine low pressure cylinder 15 to do work, the steam flow entering the steam turbine low pressure cylinder 15 is rapidly increased, and the load of the thermal power generator unit is rapidly increased.
When the thermal power generator unit is subjected to a peak shaving instruction of quickly reducing the load, the opening of the auxiliary heat source control valve 16 is increased, and the dredge pump 10 and the molten salt pump 8 are controlled to reduce the steam flow entering the low-pressure cylinder communicating pipe 14, so that the steam flow entering the low-pressure cylinder 15 of the steam turbine is quickly reduced, and the load of the thermal power generator unit is quickly reduced.
The molten salt in the thermal storage tank is preferably NaNO3、KNO3、Ca(NO3)2、Na2CO3、K2CO3One or more of NaCl and KCl.
The key technology of the invention is to couple geothermal energy and a heat storage peak regulation system of a thermal power generator set, and the aim of saving energy, reducing emission and improving the peak regulation flexibility of the set is achieved through the cooperative operation of the geothermal energy and the heat storage peak regulation system.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The cooperative heat storage and peak regulation system coupled with geothermal energy is characterized by comprising a high-temperature heat storage tank (1), a low-temperature heat storage tank (2), a thermal power generating unit energy storage device and a geothermal energy storage device, wherein the thermal power generating unit energy storage device comprises a high-temperature heat storage heat exchanger (3), a heat release heat exchanger (4), a water feed pump (9), a dredging pump (10), a deaerator (11), a steam turbine high-pressure cylinder (12), a steam turbine medium-pressure cylinder (13) and a steam turbine low-pressure cylinder (15);
the high-pressure turbine cylinder (12), the medium-pressure turbine cylinder (13) and the low-pressure turbine cylinder (15) are coaxially connected, superheated steam enters the high-pressure turbine cylinder (12) to do work, the reheated steam is divided into two paths, one path of the reheated steam enters the medium-pressure turbine cylinder (13) to do work, and exhaust steam of the medium-pressure turbine cylinder (13) enters the low-pressure turbine cylinder (15); the other path of the water enters a high-temperature heat storage heat exchanger (3) for heat exchange, then is changed into water, enters a deaerator (11) together with external condensed water, part of the feed water in the deaerator (11) is shunted to a feed water pump (9), the other part of the feed water in the deaerator (11) is pressurized by a dredge pump (10), then is subjected to heat exchange through a heat release heat exchanger (4), and finally enters a low-pressure cylinder (15) of the steam turbine for work;
the geothermal energy storage device comprises a geothermal steam generation system (7) and a low-temperature heat storage heat exchanger (5), wherein a working medium of the geothermal steam generation system (7) returns to the geothermal steam generation system (7) after heat exchange through the low-temperature heat storage heat exchanger (5);
the fused salt input end of the high-temperature heat storage heat exchanger (3) is connected with the fused salt output end of the low-temperature heat storage heat exchanger (5), the fused salt output end of the high-temperature heat storage heat exchanger (3) is connected with the high-temperature heat storage tank (1), and the fused salt input end of the low-temperature heat storage heat exchanger (5) is connected with the low-temperature heat storage tank (2);
the fused salt input end of the heat release heat exchanger (4) is connected with the high-temperature heat storage tank (1), and the fused salt output end of the heat release heat exchanger (4) is connected with the low-temperature heat storage tank (2).
2. The cooperative heat storage and peak shaving system coupled with geothermal energy according to claim 1, wherein a steam passing pipeline between the turbine intermediate pressure cylinder (13) and the turbine low pressure cylinder (15) is provided with an intermediate and low pressure cylinder communicating pipe (14).
3. The cooperative heat storage peak shaver system coupled with geothermal energy according to claim 1, wherein a high temperature molten salt pump (8) is arranged between the heat releasing heat exchanger (4) and the high temperature heat storage tank (1).
4. The cooperative heat storage and peak shaving system coupled with geothermal energy according to claim 3, characterized in that a low temperature molten salt pump (6) is arranged between the low temperature heat storage heat exchanger (5) and the low temperature heat storage tank (2).
5. The cooperative thermal storage peak shaver system coupled with geothermal energy according to claim 4, wherein an auxiliary heat source control valve (16) is arranged between the high temperature thermal storage heat exchanger (3) and the outlet of the reheat steam.
6. The method of cooperative peak thermal storage coupled with geothermal energy using the system of claim 5, comprising the steps of:
enabling the superheated steam to enter a high-pressure cylinder (12) of the steam turbine to do work;
dividing the reheated steam into two paths, enabling one path of reheated steam to enter a steam turbine intermediate pressure cylinder (13) to do work, and enabling exhaust steam of the steam turbine intermediate pressure cylinder (13) to enter a steam turbine low pressure cylinder (15) to do work through a medium and low pressure cylinder communicating pipe (14); enabling the other path of reheated steam to enter a high-temperature heat storage heat exchanger (3), simultaneously enabling low-temperature molten salt in a low-temperature heat storage tank (2) to be conveyed to a heat storage heat exchanger (5) for heat exchange, enabling the molten salt after heat exchange to enter the high-temperature heat storage heat exchanger (3) for heat exchange with the reheated steam entering the high-temperature heat storage heat exchanger (3), enabling the reheated steam after heat exchange to enter a deaerator (11), and converting the low-temperature molten salt after heat exchange into hot molten salt to be stored in a high-temperature heat storage tank (1);
the hot working medium generated by the geothermal steam generation system (7) is conveyed to the low-temperature heat storage heat exchanger (5), the low-temperature molten salt in the low-temperature heat storage tank (2) is conveyed to the heat storage heat exchanger (5) to exchange heat with the hot working medium generated by the hot steam generation system (7) entering the low-temperature heat storage heat exchanger (5), the hot working medium after heat exchange is converted into a cold working medium to return to the hot steam generation system (7), and the low-temperature molten salt after heat exchange is subjected to heat exchange with the reheated steam in the high-temperature heat storage heat exchanger (3) again through the high-temperature heat storage heat exchanger (3) to be converted into hot molten salt to be stored in the high-temperature heat storage tank (1);
the method comprises the steps of pressurizing feed water in a deaerator (11) through a dredge pump (10), conveying the pressurized feed water to a heat release heat exchanger (4), conveying hot molten salt in a high-temperature heat storage tank (1) to the heat release heat exchanger (4), exchanging heat with the feed water of the deaerator (11) in the heat release heat exchanger (4), returning low-temperature molten salt subjected to heat exchange to a low-temperature heat storage tank (2), converting feed water heat exchange into high-temperature steam, introducing the high-temperature steam into a medium-low pressure cylinder communicating pipe (14), mixing the high-temperature steam with exhaust steam of a medium-pressure cylinder (13) of a steam turbine, and then introducing the high-temperature steam into a low-pressure cylinder (15) of the steam turbine to do work.
7. The cooperative heat storage and peak shaving method coupled with geothermal energy according to claim 6, wherein when the thermal power generating unit is subjected to a peak shaving instruction of fast load increase, the auxiliary heat source control valve (16) is closed, and the evacuation pump (10) and the molten salt pump (8) are controlled, so that the steam flow entering the intermediate and low pressure cylinder communicating pipe (14) is increased, the reheated steam directly enters the turbine low pressure cylinder (15) to do work, the steam flow entering the turbine low pressure cylinder (15) is rapidly increased, and the load of the thermal power generating unit is rapidly increased.
8. The cooperative heat storage and peak shaving method coupled with geothermal energy according to claim 6, wherein when the thermal power generating unit is subjected to a peak shaving instruction of a fast load reduction, the opening degree of the auxiliary heat source control valve (16) is increased, and the evacuation pump (10) and the molten salt pump (8) are controlled to reduce the steam flow entering the intermediate and low pressure cylinder communicating pipe (14), so that the steam flow entering the low pressure cylinder (15) of the steam turbine is rapidly reduced, and the load of the thermal power generating unit is rapidly reduced.
9. The cooperative peak shaving method with heat storage coupled with geothermal energy according to any one of claims 6-8, wherein the molten salt in the high-temperature heat storage tank (1) and the low-temperature heat storage tank (2) is NaNO3、KNO3、Ca(NO3)2、Na2CO3、K2CO3One or more of NaCl and KCl.
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