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Compressed air energy storage system and method utilizing cold energy of liquefied natural gas

A compressed air energy storage and liquefied natural gas technology, which is applied in the direction of liquid variable capacity machinery, steam engine equipment, mechanical equipment, etc., can solve the problems of long-distance transmission that cannot recover energy, low efficiency of cold energy recovery, energy waste, etc., and achieve clean Efficient utilization, improved recycling efficiency, and environmentally friendly effects

Inactive Publication Date: 2016-08-17
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

LNG is stored in a liquid state at the receiving station. The gaseous natural gas required by natural gas users must be obtained through LNG heat-absorbing gasification. Currently, there are the following conventional technical means: seawater gasification, air gasification or natural gas supplementary gasification, not recovered The cold energy in the gasification process causes a lot of energy waste
Existing LNG cold energy utilization technologies, such as food cold storage, rubber crushing, etc., all use cold energy directly. Since the temperature required by cold storage is much higher than that of LNG, the large temperature difference heat transfer makes its cold energy recovery efficiency low , and the direct use of cold energy technology cannot transmit recovered energy over long distances, and can only be limited to the vicinity of the LNG receiving station

Method used

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  • Compressed air energy storage system and method utilizing cold energy of liquefied natural gas
  • Compressed air energy storage system and method utilizing cold energy of liquefied natural gas

Examples

Experimental program
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Embodiment 1

[0054] figure 1 Shown is Embodiment 1 of the compressed air energy storage system using LNG cold energy of the present invention, which adopts two-stage compression, inter-stage cooling and two-stage expansion, and inter-stage heating. figure 1 The reference signs in have the following meanings:

[0055] Motor 1, low-pressure compressor 5, high-pressure compressor 9, high-pressure expander 19, low-pressure expander 23, heat exchanger 3, 7, 17, 21, valve 11, 15, 27, pipeline 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 26, 29, 30, 31, 32, 34, 35, gas storage device 13, generator 24, LNG pump 28, LNG storage device 25, vaporizer 33 , air and LNG.

[0056] The electric motor 1 is connected with the common transmission shaft of the compressor unit, and the generator 24 is connected with the common transmission shaft of the expansion unit. The low-pressure compressor 5 communicates with the atmosphere through the pipelines 2 and 4 and the heat exchanger 3; the low-pressure compressor...

Embodiment 2

[0060] figure 2 Shown is Embodiment 2 of the compressed air energy storage system using LNG cold energy of the present invention, its main structure is the same as Embodiment 1, but it uses three-stage compression, inter-stage cooling, three-stage expansion, and inter-stage heating to replace the embodiment 1 in two-stage compression, interstage cooling and two-stage expansion, interstage heating. in, figure 2 The reference signs in have the following meanings:

[0061] Motor 1, low-pressure compressor 39, medium-pressure compressor 43, high-pressure compressor 47, high-pressure expander 52, medium-pressure expander 56, low-pressure expander 60, heat exchangers 37, 41, 45, 50, 54, 58, Gas storage device 13, pipelines 36, 38, 40, 42, 44, 46, 48, 12, 14, 49, 51, 53, 55, 57, 59, 61, 26, 62, 63, 64, 65, 66, 67, 34, generator 24, valves 11, 15, 27, LNG pump 28, LNG storage device 25, vaporizer 33, air and LNG.

[0062] The connection of each component is basically the same as...

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Abstract

The invention provides a compressed air energy storage system utilizing cold energy of liquefied natural gas (LNG). The compressed air energy storage system comprises a first heat exchanger unit, an air compressor set, an air storage device and an expansion machine set, wherein air in the first heat exchanger unit is subjected to heat exchange with the liquefied natural gas and heat-exchanged and cooled air is output; the air compressor set is used for inputting the heat-exchanged and cooled air and outputting compressed air; the air storage device is used for inputting the compressed air in an energy storage process or outputting the stored compressed air in an energy releasing process; and the expansion machine set is used for inputting the stored compressed air and applying work to the expansion machine set after the compressed air is heated by a second heat exchange unit in the expansion machine set. The invention further provides a compressed air energy storage method utilizing the cold energy of the liquefied natural gas. According to the energy storage system and the energy storage method, provided by the invention, a compressed air energy storage technology is combined with cold energy recycling of the LNG, the output power of a unit working medium of an expansion machine is improved by utilizing stage heating, and the total efficiency of the system is improved; and the energy storage system and the energy storage method are applicable to various types of power supplies, are environmentally friendly, and have a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of energy storage and the technical field of cold energy recycling, in particular to a compressed air energy storage system and an energy storage method utilizing the cold energy of liquefied natural gas (LNG). Background technique [0002] In recent years, my country's LNG receiving stations and LNG consumption have begun to take shape and continue to rise. LNG is liquid and has a high energy density, which has obvious cost advantages in long-distance transportation. LNG is stored in a liquid state at the receiving station. The gaseous natural gas required by natural gas users must be obtained through LNG heat-absorbing gasification. Currently, there are the following conventional technical means: seawater gasification, air gasification or natural gas supplementary gasification, not recovered The cold energy in the gasification process causes a lot of energy waste. Existing LNG cold energy utilization tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K7/02F01K27/00F04B35/04F04B41/02F04B25/00F04B39/06
CPCF01K7/02F01K27/00F04B25/00F04B35/04F04B39/06F04B41/02Y02E60/16
Inventor 张雪辉陈海生李文朱阳历胡东旭李弘扬
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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