CN113154500B - Wind energy utilization method and device based on cogeneration coupling molten salt heat storage - Google Patents
Wind energy utilization method and device based on cogeneration coupling molten salt heat storage Download PDFInfo
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- 150000003839 salts Chemical class 0.000 title claims abstract description 171
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005338 heat storage Methods 0.000 title claims abstract description 23
- 230000008878 coupling Effects 0.000 title claims abstract description 20
- 238000010168 coupling process Methods 0.000 title claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 20
- 238000010248 power generation Methods 0.000 claims abstract description 109
- 238000004146 energy storage Methods 0.000 claims abstract description 104
- 239000002699 waste material Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 8
- 238000001704 evaporation Methods 0.000 claims description 8
- 230000008020 evaporation Effects 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 238000009434 installation Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D11/00—Central heating systems using heat accumulated in storage masses
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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
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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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
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/10—Combinations of wind motors with apparatus storing energy
- F03D9/18—Combinations of wind motors with apparatus storing energy storing heat
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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
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
- F03D9/255—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
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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
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
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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
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/028—Control arrangements therefor
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- 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
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- 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
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Abstract
The invention discloses a wind energy utilization method and equipment based on cogeneration coupling molten salt heat storage, wherein the method comprises the following steps: when the wind speed of the wind power generation system reaches a preset rated wind speed, electric energy generated by the wind power generation system is transmitted to the cogeneration system and the molten salt energy storage system, heat is supplied to a heat user through the cogeneration system, and waste wind power in the electric energy is converted into heat energy through the molten salt energy storage system to be stored; when the wind speed of the wind power generation system does not reach the preset rated wind energy, the heat energy stored in the molten salt energy storage system supplies heat to a heat user through the cogeneration system, and supplies power to the low-pressure steam boiler system through the wind power generation system, so that the steam generated by the low-pressure steam boiler system is input to the heat supply network system, and the problems that the bidirectional conversion of heat energy and electric energy cannot be realized and the operation cost is high in the prior art are solved.
Description
Technical Field
The application relates to the field of wind energy utilization, in particular to a wind energy utilization method and device based on cogeneration coupling molten salt heat storage.
Background
Due to its wide availability and relatively high energy density, wind energy is widely regarded as the most promising energy source among all clean renewable energy sources by countries in the world, and has a wide development prospect. In recent years, the installed wind power capacity of China is gradually increased year by year, and the problem of wind power consumption is more and more concerned. When wind power resources cannot be fully utilized, the phenomenon of wind abandon can be caused, and the phenomenon is particularly common and serious in the three north areas of China. In order to meet the requirement of heating in winter, most of grid-connected cogeneration units in the power system operate in a mode of fixing power by heat, so that the grid-connected electric quantity of wind power is further compressed.
At present, methods for absorbing abandoned wind by a cogeneration system are mostly based on adding heat storage equipment or electric boiler equipment for absorbing abandoned wind into the cogeneration power generation system, and the methods are characterized in that redundant wind power is converted into heat energy for storage and utilization, but bidirectional conversion of heat energy and electric energy is difficult to realize.
On the other hand, the fluctuation of wind power needs to be configured with a corresponding reasonable power supply for peak regulation, and the deep peak regulation is difficult for wind power by a power grid structure mainly based on coal power in China. The wind turbine generator is connected into a power grid, so that the electric energy quality and the stability of a power system are reduced, the problems of automatic reclosing of a power system circuit and the like are caused, meanwhile, a standby wind power installation with a considerable capacity must be equipped, and along with the great increase of the capacity of the wind power installation, the brought operation cost is very high.
At present, the combined operation of the wind turbine generator and other energy systems is mainly used for an electric power system and has not been considered in a district heating system based on cogeneration.
Therefore, a wind energy utilization method based on cogeneration coupling molten salt heat storage is provided, synchronous operation of a cogeneration unit and a wind generating set is realized at rated wind speed, on the other hand, further absorption and storage of abandoned wind is realized based on a molten salt heat storage non-afterburning compressed air energy storage technology, and when wind power is insufficient, energy supplement is continuously provided for the cogeneration unit through an energy storage system.
Disclosure of Invention
The invention provides a wind energy utilization method based on cogeneration coupling molten salt heat storage, which is used for solving the technical problems that bidirectional conversion of heat energy and electric energy cannot be realized and the operation cost is high in the prior art, and comprises the following steps:
when the wind speed of the wind power generation system reaches a preset rated wind speed, electric energy generated by the wind power generation system is transmitted to the cogeneration system and the molten salt energy storage system, heat is supplied to a heat user through the cogeneration system, and waste wind power in the electric energy is converted into heat energy through the molten salt energy storage system to be stored;
when the wind speed of the wind power generation system does not reach the preset rated wind energy, the heat energy stored in the molten salt energy storage system supplies heat to a heat user through the cogeneration system, and supplies power to the low-pressure steam boiler system through the wind power generation system, so that the steam generated by the low-pressure steam boiler system is input to the heat supply network system.
Preferably, when the wind speed of the wind power generation system reaches a preset rated wind speed, the method for transmitting the electric energy generated by the wind power generation system to the cogeneration system and the molten salt energy storage system specifically comprises the following steps:
when the wind speed of the wind power generation system reaches a preset rated wind speed, the electric energy generated by the wind power generation system is used for supplying power to the electric heater of the cogeneration system through the fourth line switch, and after the third line switch is closed, the electric energy generated by the wind power generation system is used for supplying power to the motor of the molten salt energy storage system.
Preferably, the cogeneration system supplies heat to a heat consumer, and specifically comprises:
in the cogeneration system, a feed water pump pumps feed water into an evaporation heating surface of a steam boiler, and electric energy generated by a wind generating set system heats an electric heater so as to realize superheated steam at the outlet of a steam drum of the steam boiler;
and transmitting the superheated steam to the heat supply network system, and supplying heat to a heat user through the heat supply network system.
Preferably, the superheated steam is transmitted to the heat supply network system, and heat is supplied to a heat user through the heat supply network system, specifically:
transmitting the superheated steam to a heat grid accelerator of the cogeneration system through a steam turbine of the cogeneration system;
and transmitting the superheated steam to the heat supply network system through the heat supply network accelerator, and supplying heat to the heat user through a heat supply network circulating pump of the heat supply network system.
Preferably, the superheated steam is realized at the outlet of the steam drum of the steam boiler, and the method further comprises the following steps:
inputting the superheated steam into a steam turbine of the cogeneration system, and driving a generator to generate power by expansion work of the steam turbine;
and discharging the superheated steam into a condenser for cooling, and pumping the condensed water obtained by cooling into the evaporation heating surface through a water feed pump so as to realize steam-water circulation.
Preferably, the wind power generation system supplies power to the low-pressure steam boiler system so as to input the steam generated by the low-pressure steam boiler system to the heat supply network system, and specifically, the wind power generation system includes:
when the wind speed of the wind power generation system does not reach the preset rated wind energy, closing a fifth circuit switch, and transmitting the electric energy of the wind power generation system to an electric heater of the low-pressure steam boiler system so as to realize superheated steam at the steam drum outlet of the steam boiler;
and transmitting the superheated steam to the heat supply network system, and supplying heat to a heat user through the heat supply network system.
Preferably, the molten salt energy storage system converts the abandoned wind electric energy in the electric energy into heat energy for storage, and specifically comprises the following steps:
pumping low-temperature molten salt in a low-temperature molten salt tank in the molten salt energy storage system into an electric heater of the molten salt energy storage system through a molten salt pump;
supplying power to an electric heater of the molten salt energy storage system through the wind power generation system;
the low-temperature molten salt is heated by the electric heater of the molten salt energy storage system and stored in the high-temperature molten salt tank, so that the abandoned wind electric energy in the electric energy is converted into heat energy to be stored.
Preferably, the molten salt energy storage system converts the abandoned wind electric energy in the electric energy into heat energy for storage, and the method further comprises the following steps:
after the third circuit switch is closed, the wind power generation system supplies power to the motor of the molten salt energy storage system and drives an air compressor to boost air;
and the boosted high-pressure air is cooled by a cooling water heat exchanger and then stored in an air storage tank.
Preferably, when the wind speed of the wind power generation system does not reach a preset rated wind energy, the heat energy stored in the molten salt energy storage system is used for supplying heat to a heat user through the cogeneration system, specifically:
when the wind speed of the wind power generation system does not reach the preset rated wind energy, high-pressure air is released from the gas storage chamber of the molten salt energy storage system, is heated by high-temperature molten salt in the heater of the molten salt energy storage system and then enters the turbine of the molten salt energy storage system to expand and do work to drive the generator to generate power, and the power is switched on and off through a thirty-two line
The heat is supplied to heat users when the heat and power cogeneration system is connected.
Correspondingly, the invention also provides wind energy utilization equipment based on cogeneration coupling molten salt heat storage, which comprises:
the first control module is used for supplying power to an electric heater of the combined heat and power generation system through a fourth line switch by using electric energy generated by the wind power generation system when the wind speed of the wind power generation system reaches a preset rated wind speed, supplying power to a motor of the molten salt energy storage system through the electric energy generated by the wind power generation system after the third line switch is closed, supplying heat to a heat user through the combined heat and power generation system, converting abandoned wind electric energy in the electric energy into heat energy through the molten salt energy storage system for storage, and pumping low-temperature molten salt in a low-temperature molten salt tank in the molten salt energy storage system into the electric heater of the molten salt energy storage system through a molten salt pump; supplying power to an electric heater of the molten salt energy storage system through the wind power generation system; the low-temperature molten salt is heated by an electric heater of the molten salt energy storage system and stored in a high-temperature molten salt tank, so that the abandoned wind in the electric energy is converted into heat energy to be stored; after the third circuit switch is closed, the wind power generation system supplies power to the motor of the molten salt energy storage system and drives an air compressor to boost air; and the high-pressure air after being boosted is cooled by a cooling water heat exchanger and then is stored in an air storage tank.
The second control module is used for releasing high-pressure air from the air storage chamber of the molten salt energy storage system when the wind speed of the wind power generation system does not reach the preset rated wind energy, heating the air in the heater of the molten salt energy storage system through high-temperature molten salt, then entering the turbine of the molten salt energy storage system to expand and do work so as to drive the generator to generate electricity, accessing the electricity into the cogeneration system through a thirty-two line switch to supply heat to a heat user, closing a fifth line switch, and transmitting the electric energy of the wind power generation system to the electric heater of the low-pressure steam boiler system so as to realize superheated steam at the steam drum outlet of the steam boiler; and transmitting the superheated steam to the heat supply network system, and supplying heat to a heat user through the heat supply network system. Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a wind energy utilization method and equipment based on cogeneration coupling molten salt heat storage, wherein the method comprises the following steps: when the wind speed of the wind power generation system reaches a preset rated wind speed, electric energy generated by the wind power generation system is transmitted to the cogeneration system and the molten salt energy storage system, heat is supplied to a heat user through the cogeneration system, and waste wind power in the electric energy is converted into heat energy through the molten salt energy storage system to be stored; when the wind speed of the wind power generation system does not reach the preset rated wind energy, the heat energy stored in the molten salt energy storage system supplies heat to a heat user through the cogeneration system, and supplies power to the low-pressure steam boiler system through the wind power generation system, so that the steam generated by the low-pressure steam boiler system is input to the heat supply network system, and the problems that the bidirectional conversion of heat energy and electric energy cannot be realized and the operation cost is high in the prior art are solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a schematic flow chart of a wind energy utilization method based on cogeneration coupling molten salt heat storage according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a wind energy utilization device based on cogeneration coupling molten salt heat storage according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a wind energy utilization system based on cogeneration coupling molten salt heat storage according to an embodiment of the invention;
the reference numbers illustrate:
1. the wind turbine 2, the generator 3, the third circuit switch 4, the fourth circuit switch 5, the fifth circuit switch 6, the high-pressure steam boiler 7, the electric heater 8, the steam turbine 9, the generator 10, the condenser 11, the feed pump 12, the heat supply network heater 13, the low-pressure steam boiler 14, the electric heater 15, the heat supply network heater 16, the feed pump 17, the heat supply network circulating pump 18, the heat consumer 19, the generator 20, the twentieth circuit switch 21, the grid consumer 22, the air compressor 23, the turbine 24, the electric motor 25, the cooler 26, the air storage tank 27, the heater 28, the low-temperature molten salt tank 29, the molten salt pump 30, the electric heater 31, the high-temperature molten salt tank 32, the thirtieth circuit switch 33 and the thirtieth circuit switch.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
As described in the background art, most of the existing methods for removing the abandoned wind in the cogeneration system are based on adding heat storage equipment or electric boiler equipment for removing the abandoned wind into the cogeneration power generation system, and the method is characterized in that redundant wind power is converted into heat energy for storage and utilization, but bidirectional conversion of heat energy and electric energy is difficult to realize. On the other hand, the fluctuation of wind power needs to be configured with a corresponding reasonable power supply for peak regulation, and the power grid structure mainly based on coal power in China is difficult to deeply regulate the peak for the wind power. The wind turbine generator is connected into a power grid, so that the electric energy quality and the stability of an electric power system are reduced, the problems of automatic reclosing of a circuit of the electric power system and the like are caused, meanwhile, a standby wind power installation machine with a considerable capacity must be equipped, the operation cost brought about is very high along with the great increase of the capacity of the wind power installation machine, at present, the combined operation of the wind turbine generator and other energy systems is mainly used for the electric power system, and the combined operation of the wind turbine generator and other energy systems is not considered in a regional heat supply system based on the cogeneration.
In order to solve the above problems, an embodiment of the present application provides a method and an apparatus for utilizing wind energy based on cogeneration coupling molten salt thermal storage, where the method includes: when the wind speed of the wind power generation system reaches a preset rated wind speed, electric energy generated by the wind power generation system is transmitted to the cogeneration system and the molten salt energy storage system, heat is supplied to a heat user through the cogeneration system, and waste wind power in the electric energy is converted into heat energy through the molten salt energy storage system to be stored; when the wind speed of the wind power generation system does not reach the preset rated wind energy, the heat energy stored in the molten salt energy storage system is used for supplying heat to a heat user through the cogeneration system, and the wind power generation system is used for supplying power to the low-pressure steam boiler system so as to input the steam generated by the low-pressure steam boiler system into the heat supply network system, so that the technical problems that bidirectional conversion of heat energy and electric energy cannot be realized and the operation cost is high in the prior art are solved, and the operation stability of the cogeneration system is improved.
Fig. 1 shows a schematic flow chart of a wind energy utilization method based on cogeneration and coupling molten salt heat storage according to an embodiment of the present invention, where the method includes:
s101, when the wind speed of the wind power generation system reaches a preset rated wind speed, electric energy generated by the wind power generation system is transmitted to the cogeneration system and the molten salt energy storage system, heat is supplied to a heat user through the cogeneration system, and the abandoned wind power energy in the electric energy is converted into heat energy through the molten salt energy storage system to be stored.
Specifically, in the scheme, as shown in fig. 3, the wind energy utilization method is applied to a wind energy utilization system of cogeneration coupling molten salt heat storage, which includes a wind power generation system i, a cogeneration system ii, a heat supply network system iii, a low-pressure steam boiler system iv and a molten salt energy storage system v, when the wind speed of the wind power generation system reaches a preset rated wind speed, it is indicated that the electric power of the wind power generation system is enough to ensure the normal operation of the system, the electric energy of the wind power generation system is transmitted to the cogeneration system and the molten salt energy storage system to supply power to the cogeneration system, the electric energy drives the operation of the cogeneration system to ensure that the cogeneration system supplies heat to heat users, and simultaneously the electric power also converts the waste wind energy in the electric energy into heat energy for storage through the molten salt energy storage system, so as to realize the utilization of the waste wind energy, and energy waste is reduced.
In order to transmit the electric energy generated by the wind power generation system to the cogeneration system and the molten salt energy storage system, in a preferred embodiment of the present invention, when the wind speed of the wind power generation system reaches a preset rated wind speed, the electric energy generated by the wind power generation system is transmitted to the cogeneration system and the molten salt energy storage system, specifically:
when the wind speed of the wind power generation system reaches a preset rated wind speed, the electric energy generated by the wind power generation system is used for supplying power to the electric heater of the cogeneration system through the fourth line switch, and after the third line switch is closed, the electric energy generated by the wind power generation system is used for supplying power to the motor of the molten salt energy storage system.
Specifically, the electric energy generated by the wind power generation system is used for supplying power to an electric heater of the cogeneration system through a fourth line switch, and after the third line switch is closed, the electric energy generated by the wind power generation system is used for supplying power to a motor of the molten salt energy storage system.
In order to realize heat supply to a heat consumer, in a preferred embodiment of the present disclosure, the heat consumer is supplied with heat by the cogeneration system, specifically:
in the cogeneration system, a feed water pump pumps feed water into an evaporation heating surface of a steam boiler, and electric energy generated by a wind generating set system heats an electric heater so as to realize superheated steam at the outlet of a steam drum of the steam boiler;
and transmitting the superheated steam to the heat supply network system, and supplying heat to a heat user through the heat supply network system.
Specifically, in the cogeneration system, a feed water pump pumps feed water into an evaporation heating surface of a steam boiler, electric energy generated by a wind generating set system heats an electric heater, superheated steam is realized at the outlet of a steam drum of the steam boiler by heating the feed water, and then the superheated steam is transmitted to a heat network system, and heat is supplied to a heat user through the heat network system.
In order to supply heat to the heat consumer through the heat supply network system, in a preferred embodiment of the present disclosure, the superheated steam is transmitted to the heat supply network system, and the heat supply network system supplies heat to the heat consumer, specifically:
transmitting the superheated steam to a heat grid accelerator of the cogeneration system through a steam turbine of the cogeneration system;
and transmitting the superheated steam to the heat supply network system through the heat supply network accelerator, and supplying heat to the heat user through a heat supply network circulating pump of the heat supply network system.
The superheated steam generated in the cogeneration system is transmitted to a heat supply network accelerator of the cogeneration system through a steam turbine, the superheated steam is transmitted to the heat supply network system through the heat supply network accelerator, and heat is supplied to the heat consumer through a heat supply network circulating pump of the heat supply network system.
In order to realize the superheated steam at the outlet of the steam boiler drum, in the preferred embodiment of the present scheme, the superheated steam is realized at the outlet of the steam boiler drum, and the method further comprises the following steps:
inputting the superheated steam into a steam turbine of the cogeneration system, and driving a generator to generate power by expansion work of the steam turbine;
and discharging the superheated steam into a condenser for cooling, and pumping the condensed water obtained by cooling into the evaporation heating surface through a water feed pump so as to realize steam-water circulation.
Specifically, after the superheated steam is input into a steam turbine of the cogeneration system, the superheated steam expands to work through the steam turbine to drive a generator to generate power, the superheated steam is discharged into a condenser and then cooled to form cooled condensed water, and the condensed water obtained by cooling is pumped into the evaporation heating surface through a water supply pump, so that steam-water circulation is realized, the cyclic utilization of the system is improved, and the resource loss is reduced.
In order to convert the abandoned wind electric energy in the electric energy into heat energy for storage through the molten salt energy storage system, in a preferred embodiment of the application, the abandoned wind electric energy in the electric energy is converted into heat energy for storage through the molten salt energy storage system, specifically:
pumping low-temperature molten salt in a low-temperature molten salt tank in the molten salt energy storage system into an electric heater of the molten salt energy storage system through a molten salt pump;
supplying power to an electric heater of the molten salt energy storage system through the wind power generation system;
the low-temperature molten salt is heated by the electric heater of the molten salt energy storage system and stored in the high-temperature molten salt tank, so that the abandoned wind electric energy in the electric energy is converted into heat energy to be stored.
Specifically, low-temperature molten salt in a low-temperature molten salt tank in the molten salt energy storage system is pumped into an electric heater of the molten salt energy storage system through a molten salt pump; the wind power generation system supplies power to the electric heater of the molten salt energy storage system, and the electric heater heats the low-temperature molten salt and stores the low-temperature molten salt in the high-temperature molten salt tank, so that the waste wind power in the electric energy is converted into heat energy to be stored.
In order to store the high-pressure air in the air storage tank, in a preferred embodiment of the present invention, the molten salt energy storage system converts the abandoned wind electric energy in the electric energy into heat energy for storage, and the method further includes:
after the third circuit switch is closed, the wind power generation system supplies power to the motor of the molten salt energy storage system and drives an air compressor to boost air;
and the high-pressure air after being boosted is cooled by a cooling water heat exchanger and then is stored in an air storage tank.
And S102, when the wind speed of the wind power generation system does not reach the preset rated wind energy, supplying heat energy stored in the molten salt energy storage system to a heat user through the cogeneration system, and supplying power to the low-pressure steam boiler system through the wind power generation system so as to input steam generated by the low-pressure steam boiler system to the heat supply network system.
Specifically, when the wind speed of the wind power generation system does not reach the preset rated wind energy, which indicates that the power of the wind power generation system is insufficient, the heat energy stored in the molten salt energy storage system is used for supplying heat to a heat user through the cogeneration system, and the wind power generation system is used for supplying power to the low-pressure steam boiler system, so that the steam generated by the low-pressure steam boiler system is input into the heat supply network system, and therefore stable operation of the cogeneration unit and uninterrupted cascade utilization of abandoned wind energy are ensured.
In order to input the steam generated by the low-pressure steam boiler system into the heat supply network system, in a preferred embodiment of the present application, the wind power generation system supplies power to the low-pressure steam boiler system so as to input the steam generated by the low-pressure steam boiler system into the heat supply network system, specifically:
when the wind speed of the wind power generation system does not reach the preset rated wind energy, closing a fifth circuit switch, and transmitting the electric energy of the wind power generation system to an electric heater of the low-pressure steam boiler system so as to realize superheated steam at the steam drum outlet of the steam boiler;
and transmitting the superheated steam to the heat supply network system, and supplying heat to heat users through the heat supply network system.
Specifically, when the wind speed of the wind power generation system does not reach the preset rated wind energy, the fifth circuit switch is closed, the electric energy of the wind power generation system is transmitted to the electric heater of the low-pressure steam boiler system, superheated steam is realized at the outlet of a steam drum of the steam boiler, and then the superheated steam is transmitted to the heat supply network system, and heat is supplied to a heat user through the heat supply network system.
In order to supply heat energy stored in the molten salt energy storage system to a heat user through the cogeneration system, the method specifically comprises the following steps:
when the wind speed of the wind power generation system does not reach the preset rated wind energy, high-pressure air is released from the gas storage chamber of the molten salt energy storage system, is heated by high-temperature molten salt in the heater of the molten salt energy storage system, then enters the turbine of the molten salt energy storage system to expand and do work, so as to drive the generator to generate power, and is connected to the cogeneration system through a thirty-two line switch to supply heat to a user.
Specifically, when the power of the wind power generation system is insufficient, the fused salt energy storage system provides energy for the cogeneration system, high-pressure air is released from the gas storage chamber of the fused salt energy storage system, and the high-temperature fused salt is heated in the heater of the fused salt energy storage system and then enters the turbine of the fused salt energy storage system to expand and work so as to drive the turbine to work
The generator generates electricity and is connected into the cogeneration system through the twelfth line switch to supply heat to a heat user, so that the stable operation of the cogeneration system is ensured.
By applying the technical scheme, the invention discloses a wind energy utilization method based on cogeneration coupling molten salt heat storage, which comprises the following steps of: when the wind speed of the wind power generation system reaches a preset rated wind speed, electric energy generated by the wind power generation system is transmitted to the cogeneration system and the molten salt energy storage system, heat is supplied to a heat user through the cogeneration system, and waste wind power in the electric energy is converted into heat energy through the molten salt energy storage system to be stored; when the wind speed of the wind power generation system does not reach the preset rated wind energy, the heat energy stored in the molten salt energy storage system supplies heat to a heat user through the cogeneration system, and supplies power to the low-pressure steam boiler system through the wind power generation system, so that the steam generated by the low-pressure steam boiler system is input to the heat supply network system, and the problems that the bidirectional conversion of heat energy and electric energy cannot be realized and the operation cost is high in the prior art are solved.
In order to achieve the above technical object, an embodiment of the present application further provides a wind energy utilization apparatus based on cogeneration coupling molten salt thermal storage, as shown in fig. 2, the apparatus including:
the first control module 201 is configured to, when the wind speed of the wind power generation system reaches a preset rated wind speed, supply power to an electric heater of the cogeneration system through a fourth line switch by using electric energy generated by the wind power generation system, supply power to a motor of the molten salt energy storage system through the electric energy generated by the wind power generation system after a third line switch is closed, supply heat to a heat consumer through the cogeneration system, convert wind waste electricity in the electric energy into heat energy through the molten salt energy storage system, and pump low-temperature molten salt in a low-temperature molten salt tank in the molten salt energy storage system into the electric heater of the molten salt energy storage system through a molten salt pump; supplying power to an electric heater of the molten salt energy storage system through the wind power generation system; the low-temperature molten salt is heated by an electric heater of the molten salt energy storage system and stored in a high-temperature molten salt tank, so that the abandoned wind electric energy in the electric energy is converted into heat energy to be stored; after the third circuit switch is closed, supplying power to a motor of the molten salt energy storage system through the wind power generation system, and driving an air compressor to boost air; the boosted high-pressure air is cooled through a cooling water heat exchanger and then stored in an air storage tank;
the second control module 202 is configured to release high-pressure air from the gas storage chamber of the molten salt energy storage system when the wind speed of the wind power generation system does not reach a preset rated wind energy, heat the air in a heater of the molten salt energy storage system through high-temperature molten salt, and then expand the air in a turbine of the molten salt energy storage system to apply work so as to drive a generator to generate electricity, switch the air into the cogeneration system through a thirty-two line switch to supply heat to a heat user, close a fifth line switch, and transmit electric energy of the wind power generation system to an electric heater of the low-pressure steam boiler system so as to realize superheated steam at a steam drum outlet of a steam boiler; and transmitting the superheated steam to the heat supply network system, and supplying heat to a heat user through the heat supply network system.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a mobile hard disk, etc.), and includes instructions for causing a computer to execute the method according to the embodiments of the present invention based on a wind energy utilization method of cogeneration-coupled molten salt heat storage (which can be a personal computer, a server, or a wind energy utilization method of network-based cogeneration-coupled molten salt heat storage, etc.).
Those skilled in the art will appreciate that the drawings are merely schematic representations of preferred embodiments and that the blocks or flowchart illustrations are not necessary to practice the present invention.
Those skilled in the art will appreciate that the modules in the apparatus may be distributed in the apparatus according to the description of the implementation scenario, or may be located in one or more apparatuses different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The above-mentioned serial numbers of the present invention are merely for description, and do not represent the merits of the implementation scenario.
The above disclosure is only a few specific implementation scenarios of the present invention, however, the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (5)
1. A wind energy utilization method based on combined heat and power generation coupling molten salt heat storage is applied to a combined heat and power generation coupling molten salt heat storage wind energy utilization system comprising a wind power generation system, a combined heat and power generation system, a heat supply network system, a low-pressure steam boiler system and a molten salt energy storage system, and comprises the following steps:
when the wind speed of the wind power generation system reaches a preset rated wind speed, electric energy generated by the wind power generation system is transmitted to the cogeneration system and the molten salt energy storage system, heat is supplied to a heat user through the cogeneration system, and waste wind power in the electric energy is converted into heat energy through the molten salt energy storage system to be stored;
when the wind speed of the wind power generation system does not reach the preset rated wind energy, the heat energy stored in the molten salt energy storage system is supplied to a heat user through the cogeneration system, and power is supplied to the low-pressure steam boiler system through the wind power generation system, so that steam generated by the low-pressure steam boiler system is input to the heat supply network system;
when the wind speed of the wind power generation system reaches a preset rated wind speed, the electric energy generated by the wind power generation system is supplied to an electric heater of the cogeneration system through a fourth line switch, and after the third line switch is closed, the electric energy generated by the wind power generation system is supplied to a motor of the molten salt energy storage system;
pumping low-temperature molten salt in a low-temperature molten salt tank in the molten salt energy storage system into an electric heater of the molten salt energy storage system through a molten salt pump; supplying power to an electric heater of the molten salt energy storage system through the wind power generation system; the low-temperature molten salt is heated by an electric heater of the molten salt energy storage system and stored in a high-temperature molten salt tank, so that the abandoned wind electric energy in the electric energy is converted into heat energy to be stored;
after the third circuit switch is closed, the wind power generation system supplies power to the motor of the molten salt energy storage system and drives an air compressor to boost air; the boosted high-pressure air is cooled through a cooling water heat exchanger and then stored in an air storage tank;
when the wind speed of the wind power generation system does not reach the preset rated wind energy, high-pressure air is released from a gas storage chamber of the molten salt energy storage system, is heated by high-temperature molten salt in a heater of the molten salt energy storage system and then enters a turbine of the molten salt energy storage system to expand and do work so as to drive a generator to generate electricity, and is connected into a cogeneration system through a thirty-two line switch to supply heat to a user;
when the wind speed of the wind power generation system does not reach the preset rated wind energy, closing a fifth circuit switch, and transmitting the electric energy of the wind power generation system to an electric heater of the low-pressure steam boiler system so as to realize superheated steam at the steam drum outlet of the steam boiler; and transmitting the superheated steam to the heat supply network system, and supplying heat to a heat user through the heat supply network system.
2. The method according to claim 1, wherein the cogeneration system supplies heat to the heat consumer, specifically:
in the cogeneration system, a feed water pump pumps feed water into an evaporation heating surface of a steam boiler, and electric energy generated by a wind generating set system heats an electric heater so as to realize superheated steam at the outlet of a steam drum of the steam boiler;
and transmitting the superheated steam to the heat supply network system, and supplying heat to a heat user through the heat supply network system.
3. The wind energy utilization method according to claim 2, wherein said superheated steam is delivered to said heat grid system and heat is supplied to a heat consumer through said heat grid system, in particular:
transmitting the superheated steam to a heat grid accelerator of the cogeneration system through a steam turbine of the cogeneration system;
and transmitting the superheated steam to the heat supply network system through the heat supply network accelerator, and supplying heat to the heat user through a heat supply network circulating pump of the heat supply network system.
4. The wind energy harnessing method of claim 2, wherein superheated steam is provided at an outlet of a steam drum of a steam boiler, further comprising:
inputting the superheated steam into a steam turbine of the cogeneration system, and driving a generator to generate power by expansion work of the steam turbine;
and discharging the superheated steam into a condenser for cooling, and pumping the condensed water obtained by cooling into the evaporation heating surface through a water feed pump so as to realize steam-water circulation.
5. A wind energy utilization device based on combined heat and power generation coupling molten salt heat storage is applied to a combined heat and power generation coupling molten salt heat storage wind energy utilization system comprising a wind power generation system, a combined heat and power generation system, a heat supply network system, a low-pressure steam boiler system and a molten salt energy storage system, and comprises:
the first control module is used for supplying power to an electric heater of the combined heat and power generation system through a fourth line switch by using electric energy generated by the wind power generation system when the wind speed of the wind power generation system reaches a preset rated wind speed, supplying power to a motor of the molten salt energy storage system through the electric energy generated by the wind power generation system after the third line switch is closed, supplying heat to a heat user through the combined heat and power generation system, converting abandoned wind electric energy in the electric energy into heat energy through the molten salt energy storage system for storage, and pumping low-temperature molten salt in a low-temperature molten salt tank in the molten salt energy storage system into the electric heater of the molten salt energy storage system through a molten salt pump; supplying power to an electric heater of the molten salt energy storage system through the wind power generation system; the low-temperature molten salt is heated by an electric heater of the molten salt energy storage system and stored in a high-temperature molten salt tank, so that the abandoned wind electric energy in the electric energy is converted into heat energy to be stored; after the third circuit switch is closed, the wind power generation system supplies power to the motor of the molten salt energy storage system and drives an air compressor to boost air; the boosted high-pressure air is cooled through a cooling water heat exchanger and then stored in an air storage tank;
the second control module is used for releasing high-pressure air from the air storage chamber of the molten salt energy storage system when the wind speed of the wind power generation system does not reach the preset rated wind energy, heating the air in the heater of the molten salt energy storage system through high-temperature molten salt, then entering the turbine of the molten salt energy storage system to expand and do work so as to drive the generator to generate electricity, accessing the electricity into the cogeneration system through a thirty-two line switch to supply heat to a heat user, closing a fifth line switch, and transmitting the electric energy of the wind power generation system to the electric heater of the low-pressure steam boiler system so as to realize superheated steam at the steam drum outlet of the steam boiler; and transmitting the superheated steam to the heat supply network system, and supplying heat to a heat user through the heat supply network system.
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