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Afterburning type cryogenic liquid air energy storage method, energy storage system and power generation system

A liquid air and energy storage system technology, applied in refrigeration and liquefaction, liquefaction, machine/engine, etc., can solve the problems of heat energy loss, increase system cost and floor area, slow dynamic response speed, etc., and achieve conversion rate and transformation The effect of speed increase, energy storage conversion efficiency improvement and gasification rate improvement

Active Publication Date: 2016-09-07
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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AI Technical Summary

Problems solved by technology

[0004] 1. The efficiency of the cryogenic liquid air energy storage system is low. The heat energy used in the gasification process of liquid air in the prior art comes from the heat energy released when the gaseous air is compressed into liquid air. Since the heat energy is collected, stored and transferred Therefore, the conversion rate of liquid air gasification of the existing cryogenic liquid air energy storage system is relatively low, which cannot meet the needs of use. The way to solve this problem in the prior art is to increase heat storage and heat exchange equipment, such as large cavernous gas storage chambers, etc., which greatly increases the cost and floor space of the system, and large cavernous gas storage chambers are also vulnerable to geological disasters such as earthquakes
[0005] 2. In addition, limited by the transfer efficiency of heat energy, the gasification rate of liquid air gasification is low, and the dynamic response speed is slow, so it is often impossible to drive the generator set to generate electricity in time

Method used

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  • Afterburning type cryogenic liquid air energy storage method, energy storage system and power generation system

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Embodiment 1

[0045] This embodiment provides a supplementary combustion type cryogenic liquid air energy storage method, including the following steps:

[0046] Step 1: Using electric energy to convert gaseous air into liquid air under low temperature and high pressure conditions, collecting the liquid air, and collecting the heat energy released during the conversion process, the collected heat energy is used to provide high temperature conditions for step 2;

[0047] Step 2: converting the collected liquid air into gaseous air under high temperature and high pressure conditions, and collecting the cold energy released during the conversion process, and the collected cold energy is used to provide low temperature conditions for step 1;

[0048] The step 2 also includes adding high-temperature and high-pressure gas to the converted gaseous air, specifically, the high-temperature and high-pressure gas is produced by combustion of gaseous, liquid or a combination of fuels to improve the gaseous...

Embodiment 2

[0053] This embodiment provides an energy storage system using liquid air as a working fluid, the following combination figure 1 The energy storage system of this embodiment is described in detail:

[0054] The energy storage system using liquid air as a working medium in this embodiment includes:

[0055] The energy input device 1, that is, the motor, converts electrical energy into mechanical energy and drives the first air compression device 2 and the second air compression device 4 to do work, wherein the first air compression device 2 is a low-pressure compressor; the second air compression device 4 is High pressure compressor. Specifically, the first air compression device 2 performs primary compression on the gaseous air driven by the energy input device 1. At this time, the air compressed by the primary stage is still in a gaseous state, and then the gas compressed by the primary stage is purified by the air purification device 3. Then carry out secondary compression...

Embodiment 3

[0064] This embodiment is based on specific applications based on Embodiment 1 and Embodiment 2, which provides a power generation system using liquid air as a working medium, including the energy storage described in Embodiment 2 using liquid air as a working medium The system also includes a generator set, the input shaft of the generator set is connected with the output shaft of the expansion unit 7, so that the internal energy stored in the liquid air can be converted into the kinetic energy of the expansion unit 7, which further drives the generator set to do work, and the liquid air The internal energy stored in the battery is further converted into electrical energy for use.

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Abstract

The invention provides an afterburning type cryogenic liquid air energy storage method, an energy storage system and a power generation system. The afterburning type cryogenic liquid air energy storage method includes the following steps that firstly, gaseous air is converted into liquid air under a low-temperature high-pressure condition by using electric energy, the liquid air is collected, and the heat energy released in the conversion process is collected and used for providing a high-temperature condition for the second step; and secondly, the collected liquid air is converted into gaseous air under high-temperature and high-pressure conditions, and cold energy released in the conversion process is collected and used for providing a low-temperature condition for the first step; in the second step, high-temperature and high-pressure air is supplemented into the gaseous air obtained after conversion in order to improve the enthalpy value of the gaseous air, and therefore the power and dynamic response speed of the gaseous air are improved.

Description

technical field [0001] The invention relates to the technical field of energy storage of cryogenic liquid air, in particular to a supplementary combustion type cryogenic liquid air energy storage method, an energy storage system and a power generation system. Background technique [0002] Cryogenic liquid air energy storage technology refers to the use of electric energy for compressed air during the low load period of the grid, and the air is sealed at high pressure in abandoned mines, subsidence subsea gas storage tanks, caves, expired oil and gas wells or newly built gas storage wells. The energy storage method releases compressed air during the peak period to drive the steam turbine to generate electricity. The liquid air energy storage system has the advantages of large energy storage capacity, long energy storage period, small footprint and does not depend on geographical conditions. During energy storage, the electric energy compresses, cools and liquefies the air, an...

Claims

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Application Information

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IPC IPC(8): F01K7/02F25J1/02
CPCF01K7/02F25J1/0228F25J1/0235
Inventor 赵波邓占锋徐桂芝杨岑玉王乐宋洁金翼宋鹏翔胡晓李志远梁立晓
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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