CN216851307U - Virtual power plant system based on solid particle energy storage and carbon dioxide power generation - Google Patents
Virtual power plant system based on solid particle energy storage and carbon dioxide power generation Download PDFInfo
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- CN216851307U CN216851307U CN202220451563.2U CN202220451563U CN216851307U CN 216851307 U CN216851307 U CN 216851307U CN 202220451563 U CN202220451563 U CN 202220451563U CN 216851307 U CN216851307 U CN 216851307U
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Abstract
The utility model discloses a virtual power plant system based on solid particle energy storage and carbon dioxide electricity generation, the system includes electric heating module, solid particle energy storage module, heat transfer module and carbon dioxide generating set, the system uses solid particle energy storage as the core, through integrating each module, can be when the electric wire netting electric quantity is surplus, through receiving the energy of forms such as distributed generator, electric automobile, electric wire netting abandon electricity, thermal power plant abandon heat, convert the energy into the internal energy of solid particle and temporarily store; during the power utilization peak period of the power grid, the internal energy of the solid particles is converted into electric energy through the carbon dioxide turbine and transmitted to the power grid through the heat exchange module and the supercritical carbon dioxide turbine. The system is not provided with an additional fuel system, has the attribute of a virtual power plant, can reduce the impact of a distributed power supply and new energy grid connection on a power grid, improves the stability and reliability of the power grid, can realize the storage of high-temperature heat energy by solid particles of the system, realizes high-efficiency power generation by a carbon dioxide turbine, and has higher efficiency of the whole system.
Description
Technical Field
The utility model belongs to the technical field of the energy storage, concretely relates to virtual power plant system based on solid particle energy storage and carbon dioxide electricity generation.
Background
With the increasing installation of new energy sources such as wind energy, photovoltaic energy and the like and the connection of distributed power sources and the like to a power grid in recent years, severe impact is brought to the safety and reliability of the power grid, and the contradiction between power generation and power utilization is further increased. Under the background, a certain amount of energy storage systems are configured for the power grid, so that the effect of stabilizing the power load output can be achieved. The existing mature large-scale energy storage technology mainly comprises pumped storage, electrochemical energy storage, molten salt energy storage and the like, wherein the pumped storage cannot be constructed in a large scale in northwest regions of China due to the limitation of construction conditions and construction periods, the electrochemical energy storage is limited by the service life, cost and safety and cannot meet the requirement of large-scale construction temporarily, the molten salt energy storage has great advantages in safety and service life and is expected to become the main force of the future energy storage field, but the existing mature large-scale molten salt energy storage technology has two obvious defects, namely, the molten salt is in an electricity-heat-electricity conversion form, namely, firstly, received electric energy is converted into heat energy of the molten salt, the electric energy is converted into electric energy through a steam turbine and is transmitted to a power grid when needed, the circulation efficiency is limited by the Carnot more than 40 percent, and generally; in addition, the utilization temperature interval of the molten salt is limited, the temperature is solidified when the temperature is lower than 240 ℃, a large amount of heat energy is consumed to maintain the temperature when the temperature is not operated for a long time, and the temperature is decomposed when the temperature is higher than 580 ℃, so that the efficiency of a thermoelectric conversion link is limited. Therefore, it is an urgent problem to search for a more efficient energy storage system to achieve reliable, efficient, and adaptable power supply.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the problem that adaptability is poor, efficiency is not high among the prior art, provide a virtual power plant system based on solid particle energy storage and carbon dioxide electricity generation.
In order to achieve the above purpose, the utility model adopts the following technical scheme: virtual power plant system based on solid particle energy storage and carbon dioxide electricity generation, including electrical heating module, solid particle energy storage module, heat transfer module and carbon dioxide generating set, wherein: the electric heating module is connected with the solid particle energy storage module through a pipeline, the solid particle energy storage module is connected with the heat exchange module through a pipeline, the heat exchange module is connected with the carbon dioxide generator set through a pipeline, and the carbon dioxide generator set is connected with the existing power grid through a cable; the electric heating module is also connected with an external distributed power supply, an electric automobile, peripheral photovoltaic and wind power stations through cables, and the solid particle energy storage module is also connected with the existing thermal power generating unit through a pipeline; the solid particle energy storage module comprises a plurality of low-temperature solid particle storage tanks, a plurality of high-temperature solid particle storage tanks, a plurality of low-temperature solid particle pumps and high-temperature solid particle pumps, the low-temperature solid particle pumps are connected with the low-temperature solid particle storage tanks and the electric heating module, the low-temperature solid particle pumps are used for pumping the low-temperature solid particles to the electric heating module, the high-temperature solid particle pumps are connected with the heat exchange module and the high-temperature solid particle storage tanks, and the high-temperature solid particle pumps are used for pumping the high-temperature solid particles to the heat exchange module; a multistage compressor set is arranged in the carbon dioxide generator set and used for compressing carbon dioxide gas.
The electric heating module comprises a plurality of electric heaters which are connected in series or in parallel and used for heating solid particles entering the solid particle energy storage module to realize conversion of electric energy into internal energy of the solid particles.
The heat exchange module comprises a plurality of solid particle-carbon dioxide heat exchangers connected in series, the hot side of each heat exchanger is connected with the high-temperature solid particle storage tank and the low-temperature solid particle storage tank, the cold side of each heat exchanger is connected with the carbon dioxide generator set, the high-temperature solid particles exchange heat with the carbon dioxide medium to generate the high-temperature carbon dioxide medium, the high-temperature carbon dioxide medium enters the carbon dioxide generator set to generate power, the carbon dioxide generator set is internally provided with a heat regeneration system, and the heat regeneration system is connected with the cold side of the heat exchange module.
The distributed power supply is an independent power supply with power below 50 MW.
The existing thermal power generating unit is a pure condensation or heat supply unit with 300MW, 600MW or 1000MW grade.
The solid particle medium adopts a single medium or a mixed medium.
The carbon dioxide generator set comprises a carbon dioxide turbine, a heat regenerator, a cooler and a compressor which are connected in sequence, wherein the outlet of the compressor is connected with the heat regenerator, and the compressor is a multi-stage compressor set.
And a heat exchanger is arranged between the compressors of the multi-stage compressor set to absorb heat of the medium.
Compared with the prior art, has four outstanding advantages:
the system is not provided with an additional fuel system, has the attribute of a virtual power plant, can reduce the impact of the distributed power supply and new energy grid connection on a power grid through reasonable control, and improves the stability and reliability of the power grid;
the system adopts the solid particles as the energy storage medium, the physical properties of the solid particles are stable, high-temperature heat storage can be realized, and the rear-end power generation efficiency is greatly improved;
compared with the traditional steam turbine set, the system has high cycle efficiency, small floor area and strong adaptability to sites;
when the power load peak of the system is in the power consumption peak, the system can additionally provide power output for the power grid, and the peak capacity of the power grid in the power consumption peak is increased.
Drawings
Fig. 1 is the utility model discloses virtual power plant system schematic diagram based on solid particle energy storage and carbon dioxide electricity generation.
Fig. 2 shows a possible arrangement of heat exchange modules.
Fig. 3 shows a possible arrangement of the supercritical carbon dioxide power generation module according to the present invention.
Reference numbers in the figures: 1-an electric heating module; 2-a solid particle energy storage module; 3-a heat exchange module; 4-a carbon dioxide generator set; 5-a power grid; 6-distributed power supply; 7-an electric vehicle; 8-photovoltaic/wind power plants; 9-existing thermal power generating units; 21-a cryogenic solid particle storage tank; 22-high temperature solid particle storage tank; 31-solid particle-carbon dioxide heat exchanger, 41-carbon dioxide turbine, 42-heat regenerator, 43-cooler, 44-compressor.
Detailed Description
The utility model provides a virtual power plant system based on solid particle energy storage and carbon dioxide electricity generation, it is right to combine specific embodiment below the utility model discloses do further explanation.
The utility model discloses use solid particle energy storage as the core, through integrated electric heating module, solid particle energy storage module, heat transfer module and power generation module, can be when the electric wire netting electric quantity is surplus, through receiving the energy of forms such as distributed generator, electric automobile, electric wire netting abandon electricity, thermal power plant abandon heat, convert the energy to the internal energy of solid particle and temporarily store; during the power utilization peak period of the power grid, the internal energy of the solid particles is converted into electric energy through the carbon dioxide turbine and transmitted to the power grid through the heat exchange module and the supercritical carbon dioxide turbine.
Fig. 1 is a schematic diagram of a virtual power plant system based on solid particle energy storage and carbon dioxide power generation of the present invention, the system includes an electrical heating module 1, a solid particle energy storage module 2, a heat exchange module 3 and a carbon dioxide power generator set 4, wherein the electrical heating module 1 is connected to the solid particle energy storage module 2 through a pipeline, the solid particle energy storage module 2 is connected to the heat exchange module 3 through a pipeline, the heat exchange module 3 is connected to the carbon dioxide power generator set 4 through a pipeline, and the carbon dioxide power generator set 4 is connected to an existing power grid 5 through a cable; the electric heating module 1 is further connected with an external distributed power supply 6, an electric automobile 7, peripheral photovoltaic and wind power stations 8 through cables, and the solid particle energy storage module 2 is further connected with an existing thermal power generating unit 9 through a pipeline.
The electric heating module 1 comprises a plurality of electric heaters which are connected in series or in parallel and used for heating the solid particles entering the solid particle energy storage module 2 to realize conversion of electric energy into internal energy of the solid particles.
The heat exchange module 3 comprises a plurality of solid particle-carbon dioxide heat exchangers 31, the hot side of the heat exchanger is connected with a high-temperature solid particle storage tank and a low-temperature solid particle storage tank, and the cold side of the heat exchanger is connected with a carbon dioxide generator set, fig. 2 is a feasible heat exchange module setting mode, the high-temperature solid particles exchange heat with a carbon dioxide medium to generate high-temperature carbon dioxide, the high-temperature carbon dioxide enters the carbon dioxide generator set to generate power, a heat regeneration system is arranged in the carbon dioxide generator set, and the heat regeneration system is connected with the cold side of the heat exchange module. Fig. 3 is a possible arrangement manner of the supercritical carbon dioxide power generation module, in which a high-temperature carbon dioxide medium enters a carbon dioxide turbine 41 to do work, then sequentially passes through a heat regenerator 42 and a cooler 43, is cooled, enters a compressor 44 to increase pressure, and then returns to the heat exchange module 3 to continuously absorb heat after being heated by the heat regenerator 42. The compressor 44 may be implemented as a multi-stage compressor train with a heat exchanger disposed between the compressors to absorb heat from the compressed medium.
The distributed power supply is an independent power supply with power below 50MW, the application range of the independent power supply with power below 50MW is wide, and the scheduling is more flexible.
The system can adapt to thermal power generating units of various capacity levels and can also be suitable for heat supply units, and the existing thermal power generating unit 9 can be a 300MW, 600MW or 1000MW grade pure condensation or heat supply unit.
The solid particle medium is one or any combination of quartz sand, silica sand, silicon carbide, silicon nitride, alumina, magnesia, zirconia, calcium oxide, olivine and ceramic or a material obtained by performing surface coating modification, heat treatment modification and metal doping modification on the material serving as a base material.
The electric heating module 1 comprises a plurality of electric heaters which are connected in series or in parallel, electric energy is converted into heat energy of solid particles by heating the solid particles entering the module, and the electric quantity of the distributed power supply 6, the reverse charging electric quantity of the electric automobile 7, the peripheral photovoltaic and the abandoned light wind electric quantity of the wind power station 8 can be received; the solid particle energy storage module 2 comprises a plurality of low-temperature solid particle storage tanks, a plurality of high-temperature solid particle storage tanks, a plurality of low-temperature solid particle pumps and a plurality of high-temperature solid particle pumps, the solid particles can be pumped to the electric heating module through the low-temperature solid particle pumps, the high-temperature solid particles can be pumped to the heat exchange module through the high-temperature solid particle pumps, and the plurality of low-temperature and high-temperature solid particle storage tanks can realize the storage and the cyclic utilization of the solid particles at different temperatures;
the heat exchange module 3 comprises a plurality of solid particle-carbon dioxide heat exchangers 31 connected in series, the hot side of the heat exchanger module is connected with a high-temperature solid particle storage tank and a low-temperature solid particle storage tank, the cold side of the heat exchanger module is connected with a carbon dioxide generator set, high-temperature solid particles exchange heat with feed water to generate high-temperature steam which enters the carbon dioxide generator set to generate power, the heat regeneration system is connected with the cold side of the heat exchange module, and the high-temperature solid particles exchange heat with carbon dioxide to generate high-temperature carbon dioxide which enters the carbon dioxide generator set; the carbon dioxide generator set 4 comprises a turbine and a heat regeneration system thereof, a generator and an auxiliary system, the turbine is driven to rotate by high-temperature carbon dioxide, and the generator generates electricity.
Virtual power plant system operation method based on solid particle energy storage as follows:
when the distributed power supply has surplus electric quantity, the surplus electric quantity is transmitted to the electric heating module, and the low-temperature solid particles are heated to high-temperature solid particles through the electric heater; when the electric automobile has surplus electric quantity, the surplus electric quantity is transmitted to the electric heating module in a reverse charging mode, and the low-temperature solid particles are heated to high-temperature solid particles through the electric heater; when the photovoltaic and wind power station has abandoned light and abandoned wind electric quantity, the electric quantity to be abandoned is transmitted to the electric heating module, and the low-temperature solid particles are heated to high-temperature solid particles through the electric heater;
the electric heating module starts the electric heater according to the electric quantity conditions of the distributed power supply, the electric automobile and the abandoned light and abandoned wind, and simultaneously the solid particle energy storage module starts the low-temperature solid particle pump to send the low-temperature solid particles to the electric heater for absorbing heat, so that the low-temperature solid particles are changed into high-temperature solid particles and returned to the high-temperature solid particle storage tank;
when the existing power generation organic group needs to adjust peak downwards and has surplus steam, transferring steam heat energy to solid particles through heat exchange, and returning the solid particles to the high-temperature solid particle storage tank;
the energy from different sources is converted into the heat energy of the solid particles through an electric heater or a heat exchanger and stored in the high-temperature solid particles;
when the load of the power grid needs to be increased, starting a heat exchanger in the heat exchange module, starting a high-temperature solid particle pump by the solid particle energy storage module to send high-temperature solid particles to the heat exchange module, and transferring heat energy of the high-temperature solid particles to a carbon dioxide medium through the plurality of heat exchangers to form low-temperature solid particles and returning the low-temperature solid particles to the low-temperature solid particle storage tank;
and starting the carbon dioxide generator set, and pushing the carbon dioxide turbine to generate power by using the supercritical carbon dioxide to meet the power demand of the power grid.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention, which is to be construed as broadly as the invention in accordance with the principles and spirit of the invention.
Claims (8)
1. Virtual power plant system based on solid particle energy storage and carbon dioxide electricity generation, its characterized in that, including electrical heating module (1), solid particle energy storage module (2), heat transfer module (3) and carbon dioxide generating set (4), wherein: the electric heating module (1) is connected with the solid particle energy storage module (2) through a pipeline, the solid particle energy storage module (2) is connected with the heat exchange module (3) through a pipeline, the heat exchange module (3) is connected with the carbon dioxide generator set (4) through a pipeline, and the carbon dioxide generator set (4) is connected with the existing power grid (5) through a cable; the electric heating module (1) is also connected with an external distributed power supply (6), an electric automobile (7), a peripheral photovoltaic power station and a wind power station (8) through cables, and the solid particle energy storage module (2) is also connected with an existing thermal power generating unit (9) through a pipeline; the solid particle energy storage module comprises a plurality of low-temperature solid particle storage tanks (21), a plurality of high-temperature solid particle storage tanks (22), a plurality of low-temperature solid particle pumps and high-temperature solid particle pumps, the low-temperature solid particle pumps are connected with the low-temperature solid particle storage tanks (21) and the electric heating module (1), the low-temperature solid particle pumps are used for pumping the low-temperature solid particles to the electric heating module (1), the high-temperature solid particle pumps are connected with the heat exchange module (3) and the high-temperature solid particle storage tanks (22), and the high-temperature solid particle pumps are used for pumping the high-temperature solid particles to the heat exchange module (3); a multistage compressor set is arranged in the carbon dioxide generator set (4) and used for compressing carbon dioxide gas.
2. The virtual power plant system based on solid particle energy storage and carbon dioxide power generation as claimed in claim 1, wherein the electric heating module (1) comprises a plurality of electric heaters connected in series or in parallel for heating the solid particles entering the solid particle energy storage module (2) to increase the temperature so as to convert the electric energy into the internal energy of the solid particles.
3. The virtual power plant system based on solid particle energy storage and carbon dioxide power generation of claim 1, wherein the heat exchange module (3) comprises a plurality of solid particle-carbon dioxide heat exchangers (31) connected in series, the hot side of the heat exchanger is connected with a high-temperature solid particle storage tank and a low-temperature solid particle storage tank, the cold side of the heat exchanger is connected with a carbon dioxide power generator set, the high-temperature solid particles exchange heat with a carbon dioxide medium to generate a high-temperature carbon dioxide medium, the carbon dioxide power generator set is provided with a heat regeneration system, and the heat regeneration system is connected with the cold side of the heat exchange module.
4. The virtual power plant system based on solid particle energy storage and carbon dioxide power generation of claim 1, characterized in that the distributed power source (6) is an independent power source with power below 50 MW.
5. The virtual power plant system based on solid particle energy storage and carbon dioxide power generation of claim 1, wherein the existing thermal power generating unit (9) is a 300MW, 600MW or 1000MW grade straight condensing or heat supplying unit.
6. The virtual power plant system based on solid particle energy storage and carbon dioxide power generation of claim 1, wherein the solid particle medium is a single medium or a mixed medium.
7. The virtual power plant system based on solid particle energy storage and carbon dioxide power generation of claim 1, wherein the carbon dioxide power generation unit (4) comprises a carbon dioxide turbine (41), a heat regenerator (42), a cooler (43) and a compressor (44) which are connected in sequence, an outlet of the compressor (44) is connected with the heat regenerator (42), and the compressor is a multi-stage compressor unit.
8. The virtual power plant system based on solid particle energy storage and carbon dioxide power generation of claim 1, wherein a heat exchanger is arranged between compressors of the multi-stage compressor set to absorb heat of the medium.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220451563.2U CN216851307U (en) | 2022-03-02 | 2022-03-02 | Virtual power plant system based on solid particle energy storage and carbon dioxide power generation |
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| CN202220451563.2U CN216851307U (en) | 2022-03-02 | 2022-03-02 | Virtual power plant system based on solid particle energy storage and carbon dioxide power generation |
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