Parameter coupling design method for liquefied air energy storage system

An energy storage system and coupling design technology, applied in liquefaction, refrigeration, liquefaction, calculation, etc., can solve the problems of numerous working parameters, complex single equipment, failure to consider the interaction of the system, etc., and achieve the effect of efficient operation

Active Publication Date: 2019-12-20
NORTH CHINA ELECTRICAL POWER RES INST +3
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The liquefied air energy storage system consists of a series of thermal processes such as compression, liquefaction, heat storage, cold storage, gasification, and expansion. A great challenge has come, and a systematic, efficient and reasonable parameter optimization design method is urgently needed
However, most of the current research only involves the parameter optimization design of a single device, and fails to consider the interaction between unit-unit, parameter-parameter, and unit-pa

Method used

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  • Parameter coupling design method for liquefied air energy storage system
  • Parameter coupling design method for liquefied air energy storage system
  • Parameter coupling design method for liquefied air energy storage system

Examples

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Example Embodiment

[0050] Example 1:

[0051] figure 2 It is a schematic diagram of a single-stage heat storage liquefied air energy storage system according to a specific embodiment of the present invention. As shown in the figure: the system includes main compressor, circulating compressor, cold box, throttle valve, refrigeration expander, gas-liquid separator, liquid-air storage tank, cryogenic pump, evaporator, expansion unit, heat storage unit And cold storage unit, where the main compressor is composed of No. 1 compressor and No. 2 compressor, the circulating compressor is composed of No. 3 compressor and No. 4 compressor, the expansion unit is composed of No. 1-4 expanders, and the heat storage unit It is composed of normal temperature storage tank, pump 1, high temperature storage tank, pump 2, heat exchanger, 4 air coolers and 4 air heaters. The cold storage unit is composed of a circulating fan and a cold storage tank. Its working process is as follows:

[0052] When storing energy, use ...

Example Embodiment

[0076] Example 2:

[0077] image 3 It is a schematic diagram of a liquefied air energy storage system using staged heat storage according to a specific embodiment of the present invention. Compared with Embodiment 1, the improvement is: the main compressor / circulating compressor inlet is equipped with an air preheater, and the circulating compressor It is a two-stage compression and partition cooling work plan; the heat storage unit adopts a two-stage heat storage plan, which includes medium temperature storage tank, high temperature storage tank, cooling tower, normal temperature storage tank 1 and normal temperature storage tank 2, high temperature storage tank and medium temperature storage tank The tank uses heat transfer oil and water as working media. When storing energy, the inlet air of the main compressor and the circulating compressor needs to be heated by the air preheater first, and then heated to the set temperature before entering the main compressor and the circu...

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Abstract

The invention provides a parameter coupling design method for a liquefied air energy storage system. The parameter coupling design method is implemented through at least one processor, a memory in communication connection with the processor and a computer readable storage medium storing computer programs. According to the invention, the maximization of the electricity-electricity conversion efficiency of the system is taken as a design target.Main parameters such as liquefied air energy storage pressure, main compressor/circulating compressor working stages, a main compressor/circulating compressor interstage cooling scheme, a compression heat recycling scheme and cold box high-pressure side outlet air temperature are used as optimization variables; aspen Plus process simulation software is adopted for system thermal simulation, the design process can be effectively simplified, and the design time is greatly shortened. According to the liquefied air energy storage system parameter coupling design method provided by the invention, by comprehensively considering the mutual influence among the unit-unit, the parameter-parameter and the unit-parameter of the liquefied air energy storage system, long-term reliable, stable and efficient operation of the energy storage system under variable working conditions of variable operation parameters, variable external parameters and the likecan be realized.

Description

technical field [0001] The invention belongs to the technical field of renewable energy power generation and energy storage, and in particular relates to a parameter coupling design method of a liquefied air energy storage system. Background technique [0002] Renewable energy represented by wind energy and solar energy has inherent defects such as intermittency and volatility, which contradict the long-term stability requirements of power grid operation, resulting in a large number of abandoned wind and light. Therefore, there is an urgent need for large-scale electric energy storage technology to solve the problem of difficult grid integration of renewable energy. As a large-scale energy storage technology, air liquid energy storage has many advantages such as high energy storage density, long working life, high safety level, and flexible site selection. It is considered to be one of the most promising energy storage technologies. [0003] The liquefied air energy storage...

Claims

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Application Information

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IPC IPC(8): G06F17/50F25J3/04
CPCF25J3/04769F25J3/04848F25J3/04187Y02E70/30
Inventor 刘青山司派友刘双白王维萌刘迎文何雅玲
Owner NORTH CHINA ELECTRICAL POWER RES INST
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