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Grading cold accumulation type supercritical compressed air energy storage system and method

A technology of compressed air energy storage and supercritical air, which is applied in the direction of engine function, household refrigeration equipment, steam engine equipment, etc., and can solve the problems of large-scale, low-cost, safe and reliable energy storage, insufficient cold energy recovery, etc.

Active Publication Date: 2018-12-11
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a hierarchical cold storage subsystem and a supercritical compressed air energy storage system to solve the problem of insufficient cold energy recovery and not meet the needs of large-scale, low-cost, safe and reliable energy storage

Method used

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  • Grading cold accumulation type supercritical compressed air energy storage system and method
  • Grading cold accumulation type supercritical compressed air energy storage system and method
  • Grading cold accumulation type supercritical compressed air energy storage system and method

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Embodiment 1

[0183] figure 2 It is a schematic diagram of a hierarchical cold storage type supercritical compressed air energy storage system combined with a single cryogenic cold storage cycle and an intercooler storage tank according to a specific embodiment of the present invention.

[0184] In this embodiment, the working fluid is heat transfer oil, the compressor is two-stage compression, and the expander is two-stage expansion, using a single heat storage tank, a single normal temperature tank, a single low-temperature liquid storage tank, and a single graded cold storage subsystem; wherein, the graded The cold storage subsystem includes a single cryogenic storage tank, a single intercooling storage tank, a single liquefied cold box, and a single evaporative cold box. The waste heat utilization device is an absorption refrigeration unit, and the low-temperature expander is a two-stage expansion. Atmospheric pressure. The gas returned by the cold energy recovery channel 4035 of the ...

Embodiment 2

[0194] image 3 It is a schematic diagram of a hierarchical cold storage type supercritical compressed air energy storage system in which the intercooler storage tank is a double-tank series structure in a specific embodiment of the present invention; image 3 As shown, the improvement relative to Embodiment 1 is: when at least one intercooler storage tank is two intercooler storage tanks, the lower intercooler storage tank 4021 and the upper intercooler storage tank 4022 are connected in series, and the lower intercooler storage tank 4021 stores the Cold energy from cold to normal temperature The upper intercooler storage tank 4022 stores cold energy from deep cooling to normal temperature, and the normal temperature sides of the lower intercooler storage tank 4021 and the upper intercooler storage tank 4022 are connected through the intercooler circulation fan 406, and the The advantage is that the intercooling circulating fan 406 can operate at normal temperature, avoiding ...

Embodiment 3

[0197] Figure 4 It is a schematic diagram of a graded cold storage type supercritical compressed air energy storage system under a higher pressure of a cryogenic liquid storage tank according to a specific embodiment of the present invention; Figure 4 As shown, the improvement relative to Implementation 1 is: the low-temperature and normal-pressure gas returned from the cold energy recovery channel 4035 of the liquefied cold box returns to the gas path between the drying and purification device 102 and the final compressor, instead of returning to the inlet of the primary compressor 101 . At this time, the pressure of the liquid air stored in the low-temperature heat-insulated storage tank 107 is not close to the normal pressure, but much higher than the normal pressure.

[0198] In the energy storage stage, the supercritical fluid in the cold energy compensation channel 4034 of the liquefied cold box absorbs part of the cold energy and cools down, then expands through the ...

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Abstract

The invention discloses a supercritical compressed air energy storage system. The supercritical compressed air energy storage system comprises a supercritical liquefaction subsystem, an evaporation expansion subsystem, a grading cold accumulation subsystem, a heat storage and heat exchange subsystem and a cold energy compensation subsystem, wherein the grading cold accumulation subsystem is used for realizing grading storage and release of cold energy and improving the recycling efficiency of the low-temperature cold energy in the energy release and energy storage processes so as to improve the system circulation efficiency. According to the supercritical compressed air energy storage system, additional cold energy and heat energy input are not required to be supplied from the outside, theadvantages of being high in circulation efficiency, low in cost is low, capable of achieving independent operation, environment-friendly, not limited by terrain conditions and the like, and thereforethe supercritical compressed air energy storage system is suitable for large-scale commercial application.

Description

technical field [0001] The invention relates to the fields of renewable energy, compressed air energy storage, distributed energy and the like, and in particular to a hierarchical cold storage type supercritical compressed air energy storage system and method. Background technique [0002] Compressed air energy storage is the only mature physical energy storage technology for large-scale power grid storage other than pumped hydro storage. Traditional compressed air energy storage uses compressors to compress air into large caverns for storage, and uses fossil fuels to burn and reheat in the energy release stage to expand and perform work. It is suitable for large-scale systems, with low cost and long life, but its construction site is limited and relies on Pollution caused by burning fossil fuels. Regenerative compressed air energy storage recovers the compression heat generated in the compression process and is used for reheating between turbine stages during the energy re...

Claims

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Application Information

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IPC IPC(8): F01K7/32F01K13/00F01K21/04F01K25/08F25D3/10
CPCF01K7/32F01K13/00F01K13/006F01K21/04F01K25/08F05D2260/42F25D3/102
Inventor 林曦鹏王亮陈海生谢宁宁杨征
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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