CN109854320B - Carbon dioxide energy storage and organic Rankine cycle combined power generation system - Google Patents
Carbon dioxide energy storage and organic Rankine cycle combined power generation system Download PDFInfo
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Abstract
本发明涉及一种基于LNG冷能利用的二氧化碳储能与有机朗肯循环联合发电系统，该系统包括二氧化碳储能及释能单元、有机朗肯循环发电单元和LNG供应单元。该系统以优化利用LNG的冷能为目的，通过以二氧化碳为工质的储能和释能过程，结合有机朗肯循环，实现LNG冷能的梯级利用，完成LNG冷能到电能的转化。
The invention relates to a carbon dioxide energy storage and organic Rankine cycle combined power generation system based on the utilization of LNG cold energy. The system includes a carbon dioxide energy storage and energy release unit, an organic Rankine cycle power generation unit and an LNG supply unit. The system aims to optimize the utilization of LNG cold energy. Through the process of energy storage and energy release with carbon dioxide as the working medium, combined with the organic Rankine cycle, the cascade utilization of LNG cold energy is realized, and the conversion of LNG cold energy into electric energy is completed.
Description
Technical Field
The invention belongs to the technical field of cold energy utilization and energy storage, and relates to a carbon dioxide energy storage and organic Rankine cycle combined power generation system, in particular to a carbon dioxide energy storage and organic Rankine cycle combined power generation system based on LNG cold energy utilization.
Background
With the development and progress of society, people have higher and higher requirements for energy. With the gradual exhaustion of traditional fossil energy, the importance of new energy is increasingly prominent. Among them, LNG (liquefied Natural Gas) has gained wide attention in the global area because of its abundant reserves and non-polluting properties. LNG (Liquid Natural Gas) is first vaporized and then delivered to a target customer when it is used. In the LNG gasification process, since the temperature is far lower than the ambient temperature, a large amount of cold energy (about 830kJ/kg) is released in the LNG gasification process in theory. If this portion of the cold energy can be utilized, the efficiency of the LNG utilization will be greatly increased.
The energy storage system taking carbon dioxide as a working medium is a novel physical energy storage system, the system takes carbon dioxide as a working medium, the compressor is driven by abundant electric power to compress, and meanwhile, heat in the compression process is recovered to realize energy storage; in the energy release stage, the high-pressure carbon dioxide is reheated to push the turboexpander to do work to the outside, and the energy release is completed. The application of the carbon dioxide energy storage system has very important significance for reducing energy loss and improving energy utilization efficiency.
An Organic Rankine Cycle (ORC) is a common thermodynamic Cycle, which can convert cold energy and heat energy into electric energy for external output, and is generally used for optimizing and utilizing low-grade heat energy and reducing waste of heat. In the operation process of the organic Rankine cycle, certain cold energy is required to realize phase change of the circulating working medium so as to ensure smooth operation of the boosting and reheating processes, so that the cooling process is an important link for realizing high-efficiency operation of the organic Rankine cycle.
Disclosure of Invention
Aiming at the defects and the defects in the prior art, the invention provides the carbon dioxide energy storage and organic Rankine cycle combined power generation system for reasonably recovering the cold energy in the LNG and improving the utilization efficiency of the cold energy of the LNG.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a carbon dioxide energy storage and organic Rankine cycle combined power generation system based on LNG cold energy utilization comprises a carbon dioxide energy storage and release unit, an organic Rankine cycle power generation unit and an LNG supply unit,
-the carbon dioxide energy storage and release unit comprises a carbon dioxide low-pressure storage tank, a cold accumulation heat exchange device, a carbon dioxide compressor, a heat accumulation heat exchange device, a carbon dioxide high-pressure storage tank, a carbon dioxide main expander, a carbon dioxide expander outlet cooler, and a carbon dioxide low-pressure storage tank inlet expander, wherein:
an outlet of the carbon dioxide low-pressure storage tank is communicated with an inlet of the carbon dioxide high-pressure storage tank through a carbon dioxide cold-side pipeline of the cold accumulation and heat exchange device, a carbon dioxide compressor and a carbon dioxide hot-side pipeline of the heat accumulation and heat exchange device in sequence through pipelines;
an outlet of the carbon dioxide high-pressure storage tank is communicated with an inlet of the carbon dioxide low-pressure storage tank through a carbon dioxide cold side pipeline of the heat accumulation and heat exchange device, a carbon dioxide main expansion machine, a hot side of an outlet cooler of the carbon dioxide expansion machine, a carbon dioxide hot side pipeline of the cold accumulation and heat exchange device and an inlet expansion machine of the carbon dioxide low-pressure storage tank in sequence through pipelines;
-the organic rankine cycle power generation unit comprises a cycle working medium storage tank, a cycle working medium heat exchanger and a cycle working medium expander, wherein:
an outlet of the circulating working medium storage tank is communicated with an inlet of the circulating working medium storage tank through a circulating working medium cold side pipeline of the circulating working medium heat exchanger, a cold side of an outlet cooler of the carbon dioxide expander, the circulating working medium expander and a circulating working medium hot side pipeline of the circulating working medium heat exchanger in sequence through pipelines;
-the LNG supply unit comprising an LNG storage tank, an LNG consumer unit, wherein:
and an outlet of the LNG storage tank is communicated with the LNG user unit after sequentially passing through an LNG side pipeline of the circulating working medium heat exchanger and an LNG side pipeline of the cold accumulation and heat exchange device through pipelines.
Preferably, a non-return control valve and a carbon dioxide low-pressure storage tank outlet pressure stabilizer are further arranged on a pipeline, wherein the outlet of the carbon dioxide low-pressure storage tank is communicated with the inlet of a carbon dioxide cold side pipeline of the cold accumulation and heat exchange device.
Preferably, a pipeline, in which an outlet of a carbon dioxide hot side pipeline of the heat storage and exchange device is communicated with an inlet of the carbon dioxide high-pressure storage tank, is further provided with a carbon dioxide high-pressure storage tank inlet pressure stabilizer and a carbon dioxide high-pressure storage tank inlet switch valve.
Preferably, an outlet pipeline of the carbon dioxide high-pressure storage tank is further provided with a carbon dioxide high-pressure storage tank outlet switch valve.
Preferably, a circulating working medium booster pump is further arranged on an outlet pipeline of the circulating working medium storage tank, and the circulating working medium booster pump is preferably driven by a motor.
Preferably, an LNG booster pump is further disposed on the outlet pipeline of the LNG storage tank, and the LNG booster pump is preferably driven by an electric motor.
Preferably, the heat storage and heat exchange device, the cold storage and heat exchange device, the outlet cooler of the carbon dioxide expansion machine and the circulating working medium heat exchanger all contain heat storage/cold storage materials.
Preferably, the carbon dioxide compressor is in transmission connection with an electric motor.
Preferably, the carbon dioxide main expansion machine, the carbon dioxide low-pressure storage tank inlet expansion machine and the circulating working medium expansion machine are all in transmission connection with a generator.
The carbon dioxide energy storage and organic Rankine cycle combined power generation system based on LNG cold energy utilization has the working principle and the specific operation process as follows:
in the energy storage stage, only the carbon dioxide energy storage and release unit works. The low-pressure carbon dioxide storage tank supplies low-temperature low-pressure liquid carbon dioxide, the pressure is stabilized by the non-return control valve and the outlet pressure stabilizer of the low-pressure carbon dioxide storage tank, and the low-pressure liquid carbon dioxide enters the cold side pipeline of the cold accumulation heat exchange device. In the cold side pipeline, the low-temperature and low-pressure liquid carbon dioxide absorbs the heat stored by the cold storage and heat exchange device, the temperature is increased, meanwhile, the energy storage material in the cold storage and heat exchange device is cooled, the temperature is reduced, and the cold energy of the carbon dioxide is stored. After heat exchange of the cold accumulation and heat exchange device, the liquid carbon dioxide is completely changed into a gas phase and enters a carbon dioxide compressor. The carbon dioxide compressor is driven by a motor, and compresses and boosts gas-phase carbon dioxide to obtain high-temperature and high-pressure carbon dioxide. And the high-temperature and high-pressure carbon dioxide enters a hot side pipeline of the heat storage and exchange device to absorb cold energy stored by the heat storage and exchange device, so that the temperature is reduced, and meanwhile, the energy storage material in the heat storage and exchange device is heated, so that the temperature is increased, and the heat of the carbon dioxide is stored. After heat exchange of the heat storage and exchange device, high-temperature and high-pressure gas-phase carbon dioxide is changed into a liquid phase, the inlet switch valve of the carbon dioxide high-pressure storage tank is opened at the moment, and the liquid-phase carbon dioxide enters the carbon dioxide high-pressure storage tank for storage after passing through the inlet voltage stabilizer of the carbon dioxide high-pressure storage tank and the inlet switch valve of the carbon dioxide high-pressure storage tank. The energy storage process is now complete.
In the energy release stage, the carbon dioxide energy storage and release unit and the organic Rankine cycle power generation unit work to finish external power generation. Firstly, an outlet switch valve of a carbon dioxide high-pressure storage tank is opened, the carbon dioxide high-pressure storage tank supplies high-pressure liquid-phase carbon dioxide, the carbon dioxide high-pressure storage tank enters a cold-side pipeline of the heat storage and heat exchange device, heat stored in an energy storage stage is absorbed in the cold-side pipeline, the temperature is increased, meanwhile, an energy storage material in the heat storage and heat exchange device is cooled, the temperature is reduced, and the state is changed into an initial state. The carbon dioxide after absorbing heat is converted into a gas phase from a liquid phase and then enters the carbon dioxide main expansion machine to push the carbon dioxide main expansion machine to do work, and the carbon dioxide main expansion machine drives a generator of the carbon dioxide main expansion machine to generate electricity for external power supply. The low-pressure carbon dioxide after expansion work is still higher in temperature and enters a hot side pipeline of the outlet cooler of the carbon dioxide expansion machine to release heat, the temperature is reduced, and meanwhile, the energy storage material in the outlet cooler of the carbon dioxide expansion machine absorbs the heat, and the temperature is increased. And the cooled carbon dioxide enters the hot side pipeline of the cold and heat storage device again to absorb cold energy stored in the energy storage material of the cold and heat storage device, so that the temperature is reduced, and meanwhile, the energy storage material in the cold and heat storage device is heated, so that the temperature is increased, and the state is changed into an initial state. And the cooled carbon dioxide is changed into a liquid phase and enters the inlet expander of the low-pressure carbon dioxide storage tank to be expanded again, and the inlet expander of the low-pressure carbon dioxide storage tank drives the generator of the inlet expander of the low-pressure carbon dioxide storage tank to generate power. And after the pressure of the carbon dioxide is reduced to a proper value, the carbon dioxide enters a carbon dioxide low-pressure storage tank to finish the recovery of the carbon dioxide working medium.
In the energy release stage, the organic Rankine cycle power generation units work simultaneously to generate power externally. The circulating working medium storage tank supplies circulating working medium, the circulating working medium is boosted by the circulating working medium booster pump and enters the cold side pipeline of the circulating working medium heat exchanger, the temperature is increased after the heat of the energy storage material is absorbed, meanwhile, the heat storage material in the circulating working medium heat exchanger releases heat, and the temperature is reduced. And the circulating working medium leaving the circulating working medium heat exchanger enters a cold side pipeline of the outlet cooler of the carbon dioxide expander again to absorb heat, so that the temperature is increased, and meanwhile, the energy storage material in the outlet cooler of the carbon dioxide expander releases heat, so that the temperature is reduced, and the initial state is recovered. The heated circulating working medium is changed into a gas phase, enters the circulating working medium expander to do work outwards, and the circulating working medium expander drives the circulating working medium expander to generate electricity outwards, so that electricity supply is realized. The working cycle working medium enters a hot side pipeline of the cycle working medium heat exchanger to release heat, the temperature is reduced, meanwhile, the energy storage material absorbs the heat, the temperature is increased, and the initial state is recovered. And the cooled circulating working medium is completely converted into a liquid phase from a gas phase and enters a circulating working medium storage tank to realize the recycling of the circulating working medium.
In the power generation stage of the carbon dioxide energy storage and release unit and the organic Rankine cycle power generation unit, in order to realize the smooth recovery of the carbon dioxide and the cycle working medium, the cold energy of the LNG is utilized to ensure the phase change process from the gas phase to the liquid phase of the carbon dioxide and the cycle working medium. In the power generation stage, the LNG storage tank supplies low-temperature LNG, the LNG enters an LNG side pipeline of the circulating working medium heat exchanger after being boosted by the LNG booster pump, and the cold energy is released in the LNG side pipeline and is used for cooling the gas-phase circulating working medium in a pipeline at the hot side of the circulating working medium heat exchanger. The redundant cold energy can be stored by the energy storage material in the circulating working medium heat exchanger. After heat exchange, the temperature of the LNG rises, then the LNG enters an LNG side pipeline of the cold accumulation and heat exchange device, cold energy is released in the LNG side pipeline, and gas-phase carbon dioxide in a hot side pipeline of the cold accumulation and heat exchange device is cooled. The redundant cold energy can be stored by the energy storage material in the cold storage and heat exchange device. After heat exchange, the temperature of the LNG is increased again to reach the value required by the user and is supplied to the LNG user unit.
According to the technical scheme, the carbon dioxide energy storage and organic Rankine cycle combined power generation system based on LNG cold energy utilization has the technical advantages that:
1. according to the invention, the carbon dioxide energy storage system and the organic Rankine cycle system are jointly utilized, so that the cold energy carried by the LNG is utilized more reasonably and more efficiently, the utilization efficiency of the LNG cold energy is improved, and the waste of the LNG cold energy is reduced.
2. The invention has the function of energy storage on the basis of realizing high-efficiency power generation, can be jointly utilized with renewable energy sources such as wind energy, solar energy and the like, and is a typical environment-friendly and energy-saving system.
Drawings
Fig. 1 is a schematic diagram of a carbon dioxide energy storage and organic rankine cycle combined power generation system based on LNG cold energy utilization.
Detailed Description
The present invention is further illustrated by the following figures and specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.
As shown in fig. 1, the carbon dioxide energy storage and organic rankine cycle combined power generation system based on LNG cold energy utilization of the present invention comprises a carbon dioxide low pressure storage tank 1, a non-return control valve 2, a carbon dioxide low pressure storage tank outlet voltage stabilizer 3, a cold storage heat exchanger 4, a carbon dioxide compressor 5, a motor 6, a heat storage heat exchanger 7, a carbon dioxide high pressure storage tank inlet voltage stabilizer 8, a carbon dioxide high pressure storage tank inlet switch valve 9, a carbon dioxide high pressure storage tank 10, a carbon dioxide high pressure storage tank outlet switch valve 11, a carbon dioxide main expander 12, a carbon dioxide main expander generator 13, a carbon dioxide expander outlet cooler 14, a carbon dioxide low pressure storage tank inlet expander 15, a carbon dioxide low pressure storage tank inlet expander generator 16, a cycle working medium storage tank 17, a cycle working medium booster pump 18, a cycle working medium heat exchanger 19, a cycle working medium expander 20, the system comprises a plurality of components such as a circulating working medium expander generator 21, an LNG storage tank 22, an LNG booster pump 23, an LNG user unit 24 and the like.
Specifically, the carbon dioxide energy storage and organic rankine cycle combined power generation system based on LNG cold energy utilization can be divided into 3 functional modules such as a carbon dioxide energy storage and release unit, an organic rankine cycle power generation unit and an LNG supply unit.
Carbon dioxide energy storage and energy release unit includes carbon dioxide low pressure storage tank 1, cold-storage heat transfer device 4, carbon dioxide compressor 5, heat accumulation heat transfer device 7, carbon dioxide high pressure storage tank 10, carbon dioxide main expansion machine 12, carbon dioxide expansion machine export cooler 14, carbon dioxide low pressure storage tank entry expander 15 that connect gradually through the pipeline, wherein: an outlet of the carbon dioxide low-pressure storage tank 1 is communicated with an inlet of a carbon dioxide cold side pipeline of the cold accumulation and heat exchange device 4 through a pipeline; the pipeline which is communicated with the outlet of the carbon dioxide low-pressure storage tank 1 and the inlet of the carbon dioxide cold side pipeline of the cold accumulation and heat exchange device 4 is also provided with a check control valve 2 and a carbon dioxide low-pressure storage tank outlet voltage stabilizer 3; the outlet of the carbon dioxide cold side pipeline of the cold accumulation and heat exchange device 4 is communicated with the inlet of the carbon dioxide compressor 5 through a pipeline; the outlet of the carbon dioxide compressor 5 is communicated with the inlet of the carbon dioxide hot side pipeline of the heat storage and exchange device 7 through a pipeline; an outlet of a carbon dioxide hot side pipeline of the heat storage and exchange device 7 is communicated with an inlet of a carbon dioxide high-pressure storage tank 10; and an outlet of a carbon dioxide hot side pipeline of the heat storage and exchange device 7 is communicated with an inlet of a carbon dioxide high-pressure storage tank 10, and the carbon dioxide high-pressure storage tank inlet pressure stabilizer 8 and a carbon dioxide high-pressure storage tank inlet switching valve 9 are further arranged on the pipeline. An inlet of a carbon dioxide cold side pipeline of the heat accumulation and exchange device 7 is communicated with an outlet of a carbon dioxide high-pressure storage tank 10, and a carbon dioxide high-pressure storage tank outlet switch valve 11 is arranged on a communication pipeline between the carbon dioxide cold side pipeline and the carbon dioxide high-pressure storage tank; the inlet of the carbon dioxide main expansion machine 12 is communicated with the outlet of the carbon dioxide cold side pipeline of the heat storage and exchange device 7 through a pipeline; the outlet of the carbon dioxide main expansion machine 12 is communicated with the hot side inlet of the carbon dioxide expansion machine outlet cooler 14 through a pipeline; the outlet of the hot side of the outlet cooler 14 of the carbon dioxide expansion machine is communicated with the inlet of the pipeline of the hot side of the carbon dioxide of the cold accumulation and heat exchange device 4 through a pipeline; an inlet of an expander 15 at an inlet of the carbon dioxide low-pressure storage tank is communicated with an outlet of a carbon dioxide hot side pipeline of the cold accumulation and heat exchange device 4 through a pipeline; the outlet of the carbon dioxide low-pressure storage tank inlet expander 15 is communicated with the inlet of the carbon dioxide low-pressure storage tank 1 through a pipeline. The carbon dioxide main expansion machine 12 is in transmission connection with a carbon dioxide main expansion machine generator 13, and the carbon dioxide low-pressure storage tank inlet expansion machine 15 is in transmission connection with a carbon dioxide low-pressure storage tank inlet expansion machine generator 16.
The organic Rankine cycle power generation unit comprises a cycle working medium storage tank 17, a cycle working medium booster pump 18, a cycle working medium heat exchanger 19 and a cycle working medium expander 20 which are sequentially connected through pipelines, wherein: the outlet of the circulating working medium storage tank 17 is communicated with the inlet of the circulating working medium booster pump 18 through a pipeline; the outlet of the circulating working medium booster pump 18 is communicated with the inlet of a circulating working medium cold side pipeline of the circulating working medium heat exchanger 19 through a pipeline; the outlet of the circulating working medium cold side pipeline of the circulating working medium heat exchanger 19 is communicated with the cold side inlet of the carbon dioxide expander outlet cooler 14 through a pipeline; the inlet of the cycle working medium expander 20 is communicated with the cold side outlet of the carbon dioxide expander outlet cooler 14 through a pipeline; the outlet of the cycle working medium expander 20 is communicated with the inlet of the cycle working medium hot side pipeline of the cycle working medium heat exchanger 19 through a pipeline; the outlet of the hot side pipeline of the circulating working medium heat exchanger 19 is communicated with the inlet of the circulating working medium storage tank 17 through a pipeline.
LNG supply unit, including LNG storage tank 22, LNG booster pump 23, LNG user unit 24, wherein: an outlet of the LNG storage tank 22 is communicated with an inlet of the LNG booster pump 23 through a pipeline; the outlet pipeline of the LNG booster pump 23 is communicated with the LNG user unit 24 after passing through the LNG side pipeline of the circulating working medium heat exchanger 19 and the LNG side pipeline of the cold and heat accumulation device 4 in sequence.
The carbon dioxide energy storage and organic Rankine cycle combined power generation system based on LNG cold energy utilization has the working principle and the specific operation process as follows:
in the energy storage stage, only the carbon dioxide energy storage and release unit works. The carbon dioxide low-pressure storage tank 1 supplies low-temperature low-pressure liquid carbon dioxide, the pressure is stabilized through the check control valve 2 and the carbon dioxide low-pressure storage tank outlet pressure stabilizer 3, and then the carbon dioxide low-pressure liquid carbon dioxide enters a cold side pipeline of the cold accumulation heat exchange device 4. In the cold side pipeline, the low-temperature and low-pressure liquid carbon dioxide absorbs the heat stored in the cold storage and heat exchange device 4, the temperature is increased, meanwhile, the energy storage material in the cold storage and heat exchange device 4 is cooled, the temperature is reduced, and the cold energy of the carbon dioxide is stored. After heat exchange by the cold accumulation and heat exchange device 4, the liquid carbon dioxide is completely changed into a gas phase and enters the carbon dioxide compressor 5. The carbon dioxide compressor 5 is driven by the motor 6 to compress and boost the gas-phase carbon dioxide to obtain high-temperature and high-pressure carbon dioxide. The high-temperature and high-pressure carbon dioxide enters a hot side pipeline of the heat storage and exchange device 7 to absorb cold stored in the heat storage and exchange device 7, the temperature is reduced, meanwhile, the energy storage material in the heat storage and exchange device 7 is heated, the temperature is increased, and the heat of the carbon dioxide is stored. After heat exchange of the heat storage and exchange device 7, high-temperature and high-pressure gas-phase carbon dioxide is changed into a liquid phase, at the moment, the inlet switch valve 9 of the high-pressure carbon dioxide storage tank is opened, and the liquid-phase carbon dioxide enters the high-pressure carbon dioxide storage tank 10 for storage after passing through the inlet voltage stabilizer 8 of the high-pressure carbon dioxide storage tank and the inlet switch valve 9 of the high-pressure carbon dioxide storage tank. The energy storage process is now complete.
In the energy release stage, the carbon dioxide energy storage and release unit and the organic Rankine cycle power generation unit work to finish external power generation. Firstly, the carbon dioxide high-pressure storage tank outlet switch valve 11 is opened, the carbon dioxide high-pressure storage tank 10 supplies high-pressure liquid-phase carbon dioxide, the carbon dioxide enters the cold-side pipeline of the heat storage and exchange device 7, the heat stored in the energy storage stage is absorbed in the cold-side pipeline, the temperature is increased, meanwhile, the energy storage material in the heat storage and exchange device 7 is cooled, the temperature is reduced, and the state is changed into the initial state. The carbon dioxide after absorbing heat is converted from liquid phase to gas phase, and then enters the carbon dioxide main expansion machine 12 to push the carbon dioxide main expansion machine 12 to do work, and the carbon dioxide main expansion machine 12 drives the carbon dioxide main expansion machine generator 13 to generate electricity to the outside for power supply. The low-pressure carbon dioxide after expansion work is still high in temperature and enters a hot-side pipeline of the carbon dioxide expander outlet cooler 14 to release heat, the temperature is reduced, and meanwhile, the energy storage material in the carbon dioxide expander outlet cooler 14 absorbs the heat, and the temperature is increased. The cooled carbon dioxide enters the hot side pipeline of the cold accumulation and heat exchange device 4 again to absorb the cold energy stored in the energy storage material of the cold accumulation and heat exchange device 4, the temperature is reduced, meanwhile, the energy storage material in the cold accumulation and heat exchange device 4 is heated, the temperature is increased, and the state is changed into the initial state. And the cooled carbon dioxide is changed into a liquid phase and enters the inlet expander 15 of the low-pressure carbon dioxide storage tank to be expanded again, and the inlet expander 15 of the low-pressure carbon dioxide storage tank drives the inlet expander generator 16 of the low-pressure carbon dioxide storage tank to generate power. After the pressure of the carbon dioxide is reduced to a proper value, the carbon dioxide enters a carbon dioxide low-pressure storage tank 1 to finish the recovery of the carbon dioxide working medium.
In the energy release stage, the organic Rankine cycle power generation units work simultaneously to generate power externally. The circulating working medium storage tank 17 supplies circulating working medium, the circulating working medium is boosted by the circulating working medium booster pump 18 and enters the cold side pipeline of the circulating working medium heat exchanger 19, the temperature is increased after the heat of the energy storage material is absorbed, meanwhile, the heat storage material in the circulating working medium heat exchanger 19 releases heat, and the temperature is reduced. The circulating working medium leaving the circulating working medium heat exchanger 19 enters the cold side pipeline of the carbon dioxide expander outlet cooler 14 again to absorb heat, the temperature is increased, meanwhile, the energy storage material in the carbon dioxide expander outlet cooler 14 releases heat, the temperature is reduced, and the initial state is recovered. The heated circulating working medium is changed into a gas phase, enters the circulating working medium expander 20 to do work outwards, and the circulating working medium expander 20 drives the circulating working medium expander generator 21 to generate electricity outwards, so that electricity supply is realized. The working cycle working medium enters a hot side pipeline of the cycle working medium heat exchanger 19 to release heat, the temperature is reduced, meanwhile, the energy storage material therein absorbs the heat, the temperature is increased, and the initial state is recovered. The cooled cycle working medium is completely converted from gas phase to liquid phase and enters the cycle working medium storage tank 17, so that the cycle working medium is recovered.
In the power generation stage of the carbon dioxide energy storage and release unit and the organic Rankine cycle power generation unit, in order to realize the smooth recovery of the carbon dioxide and the cycle working medium, the cold energy of the LNG is utilized to ensure the phase change process from the gas phase to the liquid phase of the carbon dioxide and the cycle working medium. In the power generation stage, the LNG storage tank 22 supplies low-temperature LNG, and the LNG is boosted by the LNG booster pump 23 and then enters the LNG side pipeline of the circulating working medium heat exchanger 19, where the LNG side pipeline releases cold energy for cooling the gas-phase circulating working medium in the hot side pipeline of the circulating working medium heat exchanger 19. The redundant cold energy can be stored by the energy storage material in the circulating working medium heat exchanger 19. After heat exchange, the temperature of the LNG rises, and then the LNG enters the LNG side pipeline of the cold accumulation and heat exchange device 4, cold energy is released in the LNG side pipeline, and gas-phase carbon dioxide in the hot side pipeline of the cold accumulation and heat exchange device 4 is cooled. The redundant cold energy can be stored by the energy storage material in the cold accumulation and heat exchange device 4. After heat exchange, the LNG temperature rises again to the user demand value and is supplied to the LNG consumer unit 24.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
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| Thermodynamic analysis of a novel energy storage system with carbon dioxide as working fluid;Yuan Zhang等;《Renewable Energy》;20161231;第99卷;第684和685页、图1a * |
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