CN112003309B - Electric power peak shaving system - Google Patents
Electric power peak shaving system Download PDFInfo
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- CN112003309B CN112003309B CN202010670616.5A CN202010670616A CN112003309B CN 112003309 B CN112003309 B CN 112003309B CN 202010670616 A CN202010670616 A CN 202010670616A CN 112003309 B CN112003309 B CN 112003309B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
- H02J15/008—Systems for storing electric energy using hydrogen as energy vector
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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
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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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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Abstract
The invention discloses an electric power peak regulation system, which belongs to the technical field of new energy and comprises the following components: supercritical CO2A circulation subsystem including the circulating CO2The first compressor, the heat regeneration structure and the CO are sequentially communicated in the flowing direction of the working medium2Turbine, heat storage device, heat regeneration structure and precooler, CO2The turbine is connected with the generator, and the heat storage device is internally provided with a heat storage medium, CO2The working medium and the heat storage medium can exchange heat in the heat storage device; the electrolytic hydrogen production subsystem comprises a water delivery device and an electrolytic hydrogen production device, wherein the electrolytic hydrogen production device is connected with an oxygen storage device, the electrolytic hydrogen production device is connected with a renewable energy power station for providing power, and water and a heat storage medium can exchange heat and vaporize in the heat storage device; the combustion device comprises a combustion chamber, a fuel inlet, an oxygen inlet and CO, wherein the fuel inlet, the oxygen inlet and the CO are communicated with the combustion chamber2Inlet and CO2The outlet and the oxygen inlet are connected with an oxygen storage device and CO2The inlet is communicated with a heat regenerative structure, and CO2The outlet is communicated with CO2And (4) a turbine. The electric power peak regulation system provided by the invention can realize peak clipping and valley filling.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to an electric power peak shaving system.
Background
Wind energy and solar power generators have the characteristics of randomness and volatility, a plurality of adverse factors are brought to power grid absorption, the problems of wind abandonment and light abandonment are prominent, and serious resource waste is caused. Aiming at the problem, a solution for converting surplus electric energy into hydrogen energy is widely developed at home and abroad, so that the solution is favorable for power consumption on one hand and can generate a hydrogen source required by a fuel cell vehicle on the other hand. The electric energy can be converted into hydrogen energy by adopting a water electrolysis hydrogen production technology, and specifically can adopt an alkaline aqueous solution electrolysis, solid polymer water electrolysis and solid oxide water electrolysis technology, wherein a solid oxide electrolytic cell in the solid oxide water electrolysis operates at a high temperature of 700 ℃ or above to electrolyze water vapor into hydrogen and oxygen, and the power consumption is reduced by 30-40% compared with the alkaline aqueous solution electrolysis and the solid polymer water electrolysis, but the electric energy conversion device has the defect of consuming high-temperature heat, so that the application scene of the solid oxide water electrolysis technology is limited, and the electric energy conversion device is difficult to be applied to wind energy and solar power stations to realize the utilization of surplus electric energy. In addition, when the generated hydrogen energy is used for non-power generation, the power demand in the peak period of power utilization cannot be met.
Disclosure of Invention
The invention aims to provide an electric power peak regulation system, which can prepare hydrogen energy by utilizing surplus electric energy in the low ebb of power consumption, can meet the power consumption requirement in the high ebb of power consumption and can realize peak clipping and valley filling.
As the conception, the technical scheme adopted by the invention is as follows:
a power peaking system, comprising:
the supercritical CO2 circulation subsystem comprises a first compressor, a regenerative structure, a CO2 turbine, a heat storage device, the regenerative structure and a precooler which are sequentially communicated along the flowing direction of a CO2 working medium, wherein the CO2 turbine is connected with a generator, a heat storage medium is arranged in the heat storage device, and the CO2 working medium and the heat storage medium can exchange heat in the heat storage device;
the electrolytic hydrogen production subsystem comprises a water delivery device and an electrolytic hydrogen production device, wherein the electrolytic hydrogen production device is connected with an oxygen storage device, the electrolytic hydrogen production device is connected with a renewable energy power station for providing electric power, the heat storage device is connected between the water delivery device and the electrolytic hydrogen production device, and water and the heat storage medium can exchange heat and vaporize in the heat storage device;
the combustion device is provided with a combustion chamber, a fuel inlet, an oxygen inlet, a CO2 inlet and a CO2 outlet, wherein the fuel inlet, the oxygen inlet, the CO2 inlet and the CO2 outlet are communicated with the combustion chamber, the oxygen inlet is connected with the oxygen storage device, the CO2 inlet is communicated with the heat regeneration structure, and the CO2 outlet is communicated with the CO2 turbine.
Further, the heat recovery structure comprises a low-temperature heat recovery device and a high-temperature heat recovery device, a high-pressure side inlet and a high-pressure side outlet of the low-temperature heat recovery device are respectively communicated with an outlet of the first compressor and a high-pressure side inlet of the high-temperature heat recovery device, and a high-pressure side outlet of the high-temperature heat recovery device is communicated with CO of the combustion device2An inlet; the low-pressure side inlet and the low-pressure side outlet of the low-temperature heat regenerator are respectively communicated withThe low-pressure side outlet of the high-temperature heat regenerator and the inlet of the precooler are communicated with the CO of the heat storage device2Working medium outlet
The electric peak shaving system also comprises a second compressor, wherein the inlet of the second compressor is communicated with the outlet at the low-pressure side of the low-temperature heat regenerator, and the outlet of the second compressor is communicated with the inlet at the high-pressure side of the high-temperature heat regenerator.
Further, the power peak shaving system also comprises CO2Collecting means of said CO2A collecting device is connected to the line between the outlet of the precooler and the inlet of the first compressor.
Further, the supercritical CO2The recirculation subsystem further comprises a gas-liquid separator connected between the outlet of the precooler and the inlet of the first compressor.
Furthermore, the water delivery device comprises a first preheater, a port A1 of the first preheater is communicated with a water delivery pipeline, a port A2 is communicated with a heat storage device, a port A3 is communicated with a hydrogen outlet of the electrolytic hydrogen production device, a port A4 is a hydrogen outlet, a port A1 is communicated with a port A2, a port A3 is communicated with a port A4, and water can exchange heat with hydrogen in the first preheater.
Further, the water delivery device still includes hydrogen water heat exchanger, the B1 mouth intercommunication of hydrogen water heat exchanger in the A4 mouth of first preheater, B2 mouth intercommunication in hydrogen conveying line, B3 mouth intercommunication in the A1 mouth of first preheater, B4 mouth intercommunication in first moisturizing pipeline, the B1 mouth intercommunication in the B2 mouth, the B3 mouth intercommunication in the B4 mouth, the water can with hydrogen in the heat exchange heat of hydrogen water heat exchanger.
Further, the electric power peak regulation system still includes hydrogen water separator, hydrogen water separator's air inlet intercommunication hydrogen conveying pipeline, hydrogen water separator's delivery port intercommunication is in the import of water delivery pump, the export of water delivery pump communicate in water conveying pipeline.
Further, the water delivery device further comprises a circulating fan, an inlet of the circulating fan is communicated with the port A4 of the first preheater, and an outlet of the circulating fan is communicated with a pipeline between the port A2 of the first preheater and the heat storage device.
Furthermore, the water delivery device further comprises an oxygen-water heat exchanger, a port C1 of the oxygen-water heat exchanger is communicated with a second water supplementing pipeline, a port C2 is communicated with a port A1 of the first preheater, a port C3 is communicated with an oxygen outlet of the electrolytic hydrogen production device, a port C4 is communicated with an oxygen storage device, a port C1 is communicated with a port C2, and a port C3 is communicated with a port C4, so that water and oxygen can exchange heat in the oxygen-water heat exchanger.
Further, the renewable energy power station is a wind power station or a solar power station.
The invention has the beneficial effects that:
the power peak regulation system provided by the invention is provided with supercritical CO2The circulation subsystem, the electrolysis hydrogen production subsystem and the combustion device can produce hydrogen through the electrolysis hydrogen production device when the electric quantity is surplus, store oxygen, and utilize the heat stored in the heat storage device to heat water to generate high-temperature steam. At high peak of electricity consumption, the fuel is burnt into CO in the combustion chamber2The working fluid provides heat to generate electricity and CO2The residual heat in the working medium is collected through a heat storage device. Can use surplus electric energy to prepare hydrogen in the low-ebb period of electricity consumption and pass through supercritical CO in the peak period of electricity consumption2The electric energy is circularly produced, and peak clipping and valley filling are realized.
Drawings
Fig. 1 is a schematic diagram of a power peak shaving system provided by the invention.
In the figure:
10. a generator; 20. a renewable energy power station;
1. supercritical CO2A circulation subsystem; 11. a first compressor; 12. a heat regeneration structure; 121. a low temperature regenerator; 122. a high temperature regenerator; 13. CO22A turbine; 14. a heat storage device; 15. a precooler; 16. a gas-liquid separator; 17. a second compressor; 18. CO22A collection device;
2. an electrolytic hydrogen production subsystem; 21. a first preheater; 22. a hydrogen water heat exchanger; 23. an oxygen-water heat exchanger; 24. a circulating fan; 25. a water delivery pump; 26. an electrolytic hydrogen production device;
3. a combustion device; 4. a hydrogen water separator; 5. a hydrogen purification device; 6. a third compressor; 7. an oxygen storage device; 8. a fourth compressor; 9. a water treatment device.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the present embodiment provides an electric power peak shaving system including a supercritical CO2A circulation subsystem 1, an electrolytic hydrogen production subsystem 2 and a combustion device 3. Wherein, supercritical CO2The circulation subsystem 1 comprises a circulating CO2The first compressor 11, the heat regeneration mechanism and the CO are sequentially communicated in the flowing direction of the working medium2Turbine 13, heat storage device 14, regenerative structure 12 and precooler 15, CO2The turbine 13 is connected to the generator 10, and the heat storage device 14 contains a heat storage medium, CO2The working fluid is able to exchange heat with the heat storage medium in the heat storage device 14. The electrolytic hydrogen production subsystem 2 comprises a water delivery device and an electrolytic hydrogen production device 26, the electrolytic hydrogen production device 26 is connected to the renewable energy power station 20 for supplying power, the heat storage device 14 is connected between the water delivery device and the electrolytic hydrogen production device 26, and water can exchange heat with a heat storage medium in the heat storage device 14 to be vaporized. The combustion device 3 is provided with a combustion chamber, a fuel inlet, an oxygen inlet and CO which are communicated with the combustion chamber2Inlet and CO2An outlet and an oxygen inlet are communicated with the oxygen storage device 7 and CO2The inlet is communicated with the regenerative structure 12, CO2The outlet is communicated with CO2A turbine 13.
In the present embodiment, the renewable energy power plant 20 is a solar power plant or a power plant.
Further, the regenerative structure 12 includes a low-temperature regenerator 121 and a high-temperature regenerator 122, a high-pressure side inlet D1 and a high-pressure side outlet D2 of the low-temperature regenerator 121 are respectively communicated with the outlet of the first compressor 11 and the high-pressure side inlet E1 of the high-temperature regenerator 122, and a high-pressure side inlet D1 of the high-temperature regenerator 122 is respectively communicated with the high-pressure side inlet of the first compressor 11 and the high-pressure side inlet of the high-temperature regenerator 122The side outlet E2 is connected to CO of the combustion device 32The inlet, low-pressure side inlet D3 and low-pressure side outlet D4 of low-temperature regenerator 121 are respectively connected to low-pressure side outlet E4 of high-temperature regenerator 122 and the inlet of precooler 15, and low-pressure side inlet E3 of high-temperature regenerator 122 is connected to CO of heat storage device 142And a working medium outlet. In addition, the electric peak shaving system further includes a second compressor 17, an inlet of the second compressor 17 is connected to the low-pressure side outlet D4 of the low-temperature regenerator 121, and an outlet of the second compressor 17 is connected to the high-pressure side inlet E1 of the high-temperature regenerator 122.
The fuel being combustion to produce CO2And/or water, further preferably the fuel is selected to be natural gas. Further, the above supercritical CO2The circulation subsystem 1 further comprises a gas-liquid separator 16 and a water treatment device 9, the gas-liquid separator 16 is connected between the outlet of the precooler 15 and the inlet of the first compressor 11, the gas-liquid separator 16 is used for separating CO2And water. The water treatment device 9 is connected with a liquid outlet of the gas-liquid separator 16 and is used for discharging the water in the water-vapor separator 17 after being treated. The water treatment device 9 is a structure common in the prior art, and is not described in detail herein.
Further, the power peak shaving system also comprises CO2Collecting device 18, CO2Collecting device 18 is connected to the outlet of precooler 15. In particular, CO2 The collecting device 18 is connected to the line between the outlet of the precooler 15 and the inlet of the first compressor 11. It will be appreciated that in the combustion chamber, natural gas is combusted to produce CO2By CO2 The collection device 18 collects the supercritical CO2Excess CO in the recycle sub-system 12And (4) collecting. Of course, in other embodiments, the fuel may be methanol, hydrogen, etc., and no CO is produced when the fuel is combusted2In the meantime, CO can be omitted2A collection device 18.
It is understood that the peak shaving system of the present embodiment provides the renewable energy power plant 20 to supply the surplus power to the electrolytic hydrogen production device 26 for hydrogen production and oxygen production during the off-peak period of power consumption. Specifically, in the electrolytic hydrogen production process, the water delivered by the water delivery device exchanges heat with the heat storage medium in the heat storage device 14And the heat storage medium releases heat, water absorbs the heat and is vaporized to form high-temperature steam, the high-temperature steam enters the cathode side of the electrolytic hydrogen production device 26 to undergo an electrolytic reaction, part of the high-temperature steam is decomposed to form hydrogen and oxygen, the oxygen enters the oxygen storage device 7, and the hydrogen is used for storage or transportation. At the peak of electricity consumption, the supercritical CO is started2Circulation, C02The working medium enters the combustion chamber of the combustion device 3 through the first compressor 11 and the heat regeneration structure 12, is mixed with the flue gas formed by the combustion of the fuel and the oxygen in the combustion chamber, then the temperature is raised, and the mixture enters the C02Turbine 13, by C02Turbine 13 and generator 10 generate electricity to supplement the electrical energy. From C02C0 from turbine 132The working medium enters the heat storage device 14 to exchange heat with the heat storage medium, C02The working medium emits heat, and the heat storage medium absorbs the heat so as to convert C0 into heat2C0 flowing out of the heat storage device 14 after storing the waste heat contained in the working medium2The working medium passes through the heat return structure 12 and the precooler 15 and then enters the first compressor 11 again for the next cycle.
Further, the heat storage device 14 includes a plurality of heat accumulators connected in series, each having a heat storage medium therein, and CO2CO from turbine 132The working medium passes through the plurality of heat accumulators in sequence. By a plurality of heat accumulators to CO2The heat contained in the working medium is fully recovered. Specifically, in the present embodiment, the number of the heat accumulators is three, but of course, in other embodiments, the number of the heat accumulators may also be two or more than three. In addition, in the embodiment, the heat storage medium is a phase change heat storage material, such as an inorganic salt, a metal alloy material, and the like, and the embodiment is not limited in particular.
As shown in fig. 1, the water delivery device includes a first preheater 21, a port a1 of the first preheater 21 is communicated with a water delivery pipeline, a port a2 is communicated with a water inlet of the heat storage device 14, a port A3 is communicated with a hydrogen outlet of the hydrogen electrolysis device 26, a port a4 is a hydrogen outlet, a port a1 is communicated with a port a2, and a port A3 is communicated with a port a4, so that water can exchange heat with hydrogen and the inside of the first preheater 21. It can be understood that the hydrogen generated by the hydrogen electrolysis device 26 is generated by electrolyzing high-temperature steam, so that the hydrogen discharged from the hydrogen outlet of the hydrogen electrolysis device 26 contains certain heat, and the water is preheated by the heat contained in the hydrogen through the first preheater 21, so that the heat contained in the hydrogen is utilized, and the waste of heat energy is avoided.
Furthermore, the water delivery device further comprises a hydrogen water heat exchanger 22, a port B1 of the hydrogen water heat exchanger 22 is communicated with a port A4 of the first preheater 21, a port B2 is communicated with a hydrogen gas delivery pipeline, a port B3 is communicated with a port A1 of the first preheater 21, a port B4 is communicated with a first water supplementing pipeline, a port B1 is communicated with a port B2, a port B3 is communicated with a port B4, and water can exchange heat with hydrogen gas in the hydrogen water heat exchanger 22. Through hydrogen water heat exchanger 22, further carry out recycle to the heat that contains in the hydrogen to accessible first moisturizing pipeline is to moisturizing in the first preheater 21.
Referring to fig. 1 again, the electric peak regulation system further includes a hydrogen-water separator 4 and a hydrogen purification device 5, an air inlet of the hydrogen-water separator 4 is communicated with the hydrogen conveying pipeline, a water outlet of the hydrogen-water separator 4 is communicated with an inlet of a water conveying pump 25, and an outlet of the water conveying pump 25 is communicated with the water conveying pipeline. The water in the hydrogen-water separator 4 can be conveyed into the electrolytic hydrogen production device 26 again through the first preheater 21 and the heat storage device 14 by the water feed pump 25 to produce hydrogen by electrolysis. The hydrogen purification device 5 is connected to the outlet of the hydrogen water separator 4 for purifying the discharged hydrogen, and the hydrogen purification device 5 is a structure common in the prior art and will not be described herein.
Further, the electrolytic hydrogen production subsystem 2 further comprises a circulating fan 24, an inlet of the circulating fan 24 is communicated with the port A4 of the first preheater 21, and an outlet of the circulating fan 24 is communicated with a pipeline between the port A2 of the first preheater 21 and the heat storage device 14. It is understood that a part of the hydrogen gas discharged from the port a1 of the first preheater 21 enters the hydrogen-water heat exchanger 22, and the other part of the hydrogen gas is sent by the circulating fan 24 and mixed with the water discharged from the port a2 of the first preheater 21 to enter the heat storage device 14.
Furthermore, the water delivery device also comprises an oxygen-water heat exchanger 23, a port C1 of the oxygen-water heat exchanger 23 is communicated with a second water supplementing pipeline, a port C2 is communicated with a port A1 of the first preheater 21, a port C3 is communicated with an oxygen outlet of the electrolytic hydrogen production device 26, a port C4 is communicated with the oxygen storage device 7, a port C1 is communicated with a port C2, a port C3 is communicated with a port C4, and water can exchange heat with oxygen in the oxygen-water heat exchanger 23. The oxygen-water heat exchanger 23 can recover and utilize the heat contained in the oxygen gas.
In addition, the electric peak shaving system further comprises a third compressor 6 connected between the oxygen storage device 7 and the port C4 of the oxygen-water heat exchanger 23, and a fourth compressor 8 connected between the oxygen storage device 7 and the oxygen inlet of the combustion device 3.
The operation of the power peaking system will be described in detail below.
Taking a wind power station as an example:
1. when the generated energy of the wind power station is surplus, the surplus part of electric quantity is utilized to produce hydrogen, and the process is as follows:
the water pump 25 pressurizes the water in the hydrogen-water separator 4 to 3MPa and supplies the water to the first preheater 21, and in the first preheater 21, the water exchanges heat with hydrogen gas, the temperature of the hydrogen gas decreases, and the temperature of the water increases. The water discharged from the port a2 of the first preheater 21 is mixed with the hydrogen discharged from the outlet of the circulating fan 24 and then enters the heat storage device 14, in the heat storage device 14, the heat storage medium releases heat, the water is heated and vaporized to form high-temperature steam with the temperature of about 700 ℃, the high-temperature steam enters the cathode side of the electrolytic hydrogen production device 26 and is electrolyzed to generate hydrogen and oxygen, the oxygen enters the oxygen storage device 7 after passing through the oxygen-water heat exchanger 23 and the third compressor 6, and the hydrogen is stored or conveyed after passing through the first preheater 21, the hydrogen-water heat exchanger 22, the hydrogen-water separator 4 and the hydrogen purification device 5. In the first preheater 21, the water and the hydrogen gas exchange heat, and the hydrogen gas gives off heat, the temperature decreases, the water absorbs heat, and the temperature increases.
When water is required to be supplemented, water is supplemented through the first water supplementing pipeline and/or the second water supplementing pipeline, water supplemented through the first water supplementing pipeline absorbs heat of hydrogen in the hydrogen water heat exchanger 22, water supplemented through the second water supplementing pipeline absorbs heat of oxygen in the oxygen water heat exchanger 23, and recycling of heat contained in hydrogen and oxygen is achieved.
2. At peak power consumption, start supercritical CO2The circulation process is as follows:
enters a first compressor11 CO of2The working medium has a temperature of 32 deg.C and a pressure of 7.5MPa, and is pressurized to 30MPa by the first compressor 11, and then CO is introduced2The working medium is absorbed by CO through the low-temperature heat regenerator 121 and the high-temperature heat regenerator 1222CO discharged from turbine 132The heat contained in the working medium enters the combustion chamber. In the combustion chamber, CO2CO produced by combustion of working medium and natural gas2Mixed with water and absorbs heat, and the temperature of the mixed gas reaches 1100 ℃. Then the mixer enters CO2The turbine 13 does work to drive the generator 10 to generate electricity. From CO2CO discharged from turbine 132The temperature of the working fluid is about 885 ℃ and CO2The working medium enters the heat storage device 14 to release heat, and the heat storage medium in the heat storage device 14 absorbs heat, in the embodiment, the heat storage medium of the three heat accumulators absorbs heat, and then the temperature reaches 730 ℃, 650 ℃ and 600 ℃, and the temperature of the CO in the heat storage device 14 reaches 730 ℃, 650 ℃ and 600 ℃, respectively2CO discharged from working medium outlet2The working medium returns to the first compressor 11 after passing through the high-temperature heat regenerator 122, the low-temperature heat regenerator 121, the precooler 15 and the gas-liquid separator 16, and redundant CO2Working medium is CO2Collected by the collecting means 18.
In the above process, CO discharged from the low-pressure side outlet of the low-temperature regenerator 1212One part of the working medium enters the precooler 15, and the other part of the working medium enters the high-pressure side inlet of the high-temperature regenerator 122 after being compressed by the second compressor 17.
In summary, the power peak shaving system provided by this embodiment is configured with the supercritical CO2The circulation subsystem 1, the electrolysis hydrogen production subsystem 2 and the combustion device 3 can produce hydrogen through the electrolysis hydrogen production device 26 and store oxygen when surplus electric quantity exists, and the electric quantity stored in the heat storage device 14 is used for heating water to generate high-temperature steam. At high peak of electricity consumption, the fuel is burnt into CO in the combustion chamber2The working fluid provides heat to generate electricity and CO2The residual heat in the working medium is collected by the heat storage device 14. Can use surplus electric energy to prepare hydrogen in the low-ebb period of electricity consumption and pass through supercritical CO in the peak period of electricity consumption2The electric energy is circularly produced, and peak clipping and valley filling are realized.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. An electrical peak shaving system, comprising:
supercritical CO2A circulation subsystem (1) comprising a circulating CO2The first compressor (11), the heat return structure (12) and the CO are sequentially communicated in the flowing direction of the working medium2A turbine (13), a heat storage device (14), the regenerative structure (12) and a precooler (15), the CO2The turbine (13) is connected with the generator (10), the heat storage device (14) is internally provided with a heat storage medium, and the CO is2The working medium can exchange heat with the heat storage medium in the heat storage device (14), and the CO2The working medium emits heat, and the heat storage medium absorbs the heat to convert the CO2Storing the waste heat contained in the working medium;
the electrolytic hydrogen production subsystem (2) comprises a water delivery device and an electrolytic hydrogen production device (26), the electrolytic hydrogen production device (26) is connected with an oxygen storage device (7), the electrolytic hydrogen production device (26) is connected with a renewable energy power station (20) for providing power, the heat storage device (14) is connected between the water delivery device and the electrolytic hydrogen production device (26), water and the heat storage medium can exchange heat in the heat storage device (14) to be vaporized, the heat storage medium emits heat, and the water absorbs the heat to be vaporized to form high-temperature steam;
a combustion device (3) having a combustion chamber and a fuel inlet, an oxygen inlet, and CO communicating with the combustion chamber2Inlet and CO2An outlet, the oxygen inlet is connected with the oxygen storage device (7), and the CO is2The inlet is communicated with the heat regenerative structure (12), and the CO is2An outlet is communicated with the CO2A turbine (13);
the water conveying device comprises a first preheater (21), wherein a port A1 of the first preheater (21) is communicated with a water conveying pipeline, a port A2 is communicated with a heat storage device (14), a port A3 is communicated with a hydrogen outlet of an electrolytic hydrogen production device (26), a port A4 is a hydrogen outlet, a port A1 is communicated with a port A2, a port A3 is communicated with a port A4, and water can exchange heat with hydrogen in the first preheater (21);
the water delivery device further comprises a hydrogen water heat exchanger (22), a port B1 of the hydrogen water heat exchanger (22) is communicated with a port A4 of the first preheater (21), a port B2 is communicated with a hydrogen gas delivery pipeline, a port B3 is communicated with a port A1 of the first preheater (21), a port B4 is communicated with a first water supplementing pipeline, a port B1 is communicated with a port B2, a port B3 is communicated with a port B4, water can exchange heat with hydrogen gas in the hydrogen water heat exchanger (22), the hydrogen water heat exchanger (22) is further connected with a first water supplementing pipeline, and water can be supplemented into the first preheater (21) through the first water supplementing pipeline;
the water delivery device further comprises an oxygen-water heat exchanger (23), a C1 port of the oxygen-water heat exchanger (23) is communicated with a second water supplementing pipeline, a C2 port is communicated with an A1 port of the first preheater (21), a C3 port is communicated with an oxygen outlet of the electrolytic hydrogen production device (26), a C4 port is communicated with an oxygen storage device (7), a C1 port is communicated with a C2 port, a C3 port is communicated with a C4 port, water can exchange heat with oxygen in the oxygen-water heat exchanger (23), and the oxygen-water heat exchanger (23) is further connected with a second water supplementing pipeline and can supplement water into the first preheater (21) through the second water supplementing pipeline.
2. An electric peak shaving system according to claim 1, wherein the regenerative structure (12) comprises a low temperature regenerator (121) and a high temperature regenerator (122), a high pressure side inlet and a high pressure side outlet of the low temperature regenerator (121) are respectively communicated with an outlet of the first compressor (11) and a high pressure side inlet of the high temperature regenerator (122), and a high pressure side outlet of the high temperature regenerator (122) is communicated with a CO inlet of the combustion device (3)2An inlet; a low-pressure side of the low-temperature regenerator (121)The outlet and the low-pressure side outlet are respectively communicated with the low-pressure side outlet of the high-temperature regenerator (122) and the inlet of the precooler (15), and the low-pressure side inlet of the high-temperature regenerator (122) is communicated with the CO of the heat storage device (14)2A working medium outlet;
the electric peak shaving system also comprises a second compressor (17), wherein the inlet of the second compressor (17) is communicated with the outlet of the low-pressure side of the low-temperature regenerator (121), and the outlet of the second compressor (17) is communicated with the inlet of the high-pressure side of the high-temperature regenerator (122).
3. The power peaking system of claim 1, further comprising CO2A collection device (18), the CO2A collecting device (18) is connected to the line between the outlet of the precooler (15) and the inlet of the first compressor (11).
4. The power peaking system of claim 3, wherein the supercritical CO2The recirculation sub-system (1) further comprises a gas-liquid separator (16), said gas-liquid separator (16) being connected between the outlet of said precooler (15) and the inlet of said first compressor (11).
5. The electric peak shaving system according to claim 1, further comprising a hydrogen water separator (4), wherein an inlet of the hydrogen water separator (4) is communicated with the hydrogen gas conveying pipeline, an outlet of the hydrogen water separator (4) is communicated with an inlet of a water conveying pump (25), and an outlet of the water conveying pump (25) is communicated with the water conveying pipeline.
6. The electric peak shaving system according to claim 1, wherein the water delivery device further comprises a circulator blower (24), an inlet of the circulator blower (24) is communicated with the port A4 of the first preheater (21), and an outlet of the circulator blower (24) is communicated with a pipeline between the port A2 of the first preheater (21) and the heat storage device (14).
7. The power peaking system of claim 1, wherein the renewable energy power plant (20) is a wind power plant or a solar power plant.
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| CN114540855A (en) * | 2022-03-29 | 2022-05-27 | 西安交通大学 | Wind-solar-electricity energy storage system for coupling hydrogen production by water electrolysis and oxygen-enriched combustion power generation |
| CN114717026B (en) * | 2022-04-27 | 2023-02-07 | 西安交通大学 | Hydrogen supercritical hydrothermal combustion reaction device and application method thereof |
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