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A compressed air energy storage system that realizes staged compression and expansion of gas

A gas classification and gas technology, applied in the direction of liquid variable displacement machinery, variable displacement pump components, pump devices, etc., can solve the problems of redundant liquid piston capacity and pressure resistance, increase operating costs, etc., to improve equipment safety Sexuality, lower manufacturing requirements, and lower manufacturing costs

Active Publication Date: 2018-05-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

However, the compressive strength of these liquid pistons is designed according to the highest gas pressure of the compressed gas. When the capacity of the liquid piston is large, its construction cost will be increased. When the gas volume to be processed is relatively small or the gas only needs to be compressed to a small pressure Will cause redundancy in liquid piston capacity and pressure resistance, increasing operating costs

Method used

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  • A compressed air energy storage system that realizes staged compression and expansion of gas
  • A compressed air energy storage system that realizes staged compression and expansion of gas
  • A compressed air energy storage system that realizes staged compression and expansion of gas

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Embodiment Construction

[0028] The embodiments are described in detail below in conjunction with the drawings.

[0029] The basic structure of the compressed air energy storage system of the present invention is as follows figure 1 As shown: A, B, and C are three liquid pistons with increasing pressure rating, which are connected in sequence through gas pipes G2 and G3. The liquid piston A with the lowest pressure rating is provided with a low pressure gas pipe G1 to connect to an external low pressure gas source, liquid piston C is connected to the gas storage system S through the gas pipe G4, the liquid pistons A and B, and B and C are connected through the liquid driving devices L1, L2, respectively, and A, B, and C are connected to the outside through the liquid pipes P1, P4, P7, respectively Hydraulic equipment M. There are valves on each pipeline to control the operation of the system.

[0030] Liquid piston A is the lowest pressure class liquid piston, only the compression migration fixed value is...

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Abstract

The invention belongs to the technical field of large-capacity electric energy storage and particularly relates to a compressed air energy storage system capable of achieving stepped gas compression and expansion through the equal-pressure migration technology. Liquid pistons are sequentially connected according to pressure-resisting level, the upper portions of every two adjacent liquid pistons are connected through a gas pipeline, and the lower portions of every two adjacent liquid pistons are connected through a liquid driving device. Each liquid piston is connected to external hydraulic equipment through a pipeline. The liquid piston with the lowest pressure-resisting level is connected with a low-pressure gas pipeline, and the liquid piston with the highest pressure-resisting level is connected with a gas storage system. According to the compressed air energy storage system, the stepped compression and expansion processes of gas in the liquid pistons are achieved, the gas is transferred between the liquid pistons with different levels through the equal-pressure migration technology, the pressure bearing change range of the liquid pistons is reduced, the equipment safety is improved, the service life of the liquid pistons is prolonged, and the manufacturing cost of equipment can be greatly reduced.

Description

Technical field [0001] The invention belongs to the technical field of large-capacity electric energy storage, and in particular relates to a compressed air energy storage system that uses isobaric migration technology to realize gas staged compression and expansion. Background technique [0002] With the large-scale integration of new energy into the grid, energy storage technology is widely used to solve the intermittent and volatility problems of new energy because it can provide sufficient peak shaving capacity. Among them, compressed air energy storage technology is widely used and has great development prospects. [0003] There are technologies that apply hydraulic turbines to compressed air energy storage, which realizes the use of hydraulic turbines and compressed air energy storage technology to jointly generate electricity and energy storage. This process uses a liquid piston and uses water as a medium to compress air to solve air compression. Problems such as adjustment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B41/02F04B41/06F04B39/00F04B39/10
CPCF04B39/0011F04B39/10F04B41/02F04B41/06Y02E60/16
Inventor 姜彤陈紫薇谭明甜傅昊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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