A system and method for seabed storage of high-pressure gas

Abstract

The invention provides a system and a method for storing high-pressure gas in the seabed. The gas is continuously compressed into a sealed gas tank arranged on the seabed through a gas inlet pipe by virtue of a gas compressor; when the high-pressure gas in the sealed gas tank needs to be used, the high-pressure gas is released to an external energy conversion device through a gas outlet pipe by the sealed gas tank; the pressure value is transferred to a controller by internal and external sensors to perform pressure comparison so as to control a lifting device; when pouring the high-pressure gas into the sealed gas tank, the lifting device drives the sealed gas tank to sink downwards; when the sealed gas tank releases the high-pressure gas outwards, the lifting device drives the sealed gas tank to float upwards; and when the sealed gas tank stores the high-pressure gas or discharges the high-pressure gas, the internal and external pressure difference borne by a shell of the sealed gas tank is within the pressure range which can be borne by the shell of the sealed gas tank, that is, high-pressure gas can be poured into the sealed gas tank without the supporting of a thicker tank wall, and the manufacture cost of the sealed gas tank is low.

Description

technical field [0001] The present invention relates to systems and methods for energy storage, particularly storage of high pressure gas on the seabed. Background technique [0002] It is difficult to store electric energy. Therefore, during the low-peak period of electricity consumption at night, the electricity in the grid is usually in a surplus state. This part of the electricity is not used effectively and is often wasted in this way. In order to be able to re-use the surplus power of the grid, the current method is to convert the power into high-pressure gas with molecular potential energy for storage. When the high-pressure gas needs to be used again, only part of the high-pressure gas should be released to perform energy conversion again. That's it. Although there is energy loss during the energy conversion process, it can be said to be an effective method for resource utilization to effectively utilize a part of the originally wasted electric energy. The method o...

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Problems solved by technology

Airtight gas tanks installed on land to store high-pressure gas for energy conversion have the following disadvantages: (1) Gas compressors are used to continuously compress the gas into the airtight gas tank, and the more high-pressure gas stored in the airtight gas tank , the greater the pressure on the tank wall, in order to ensure safety, the tank wall generally needs to use thick steel plates that can withstand greater pressure, which not only increases the cost, but also is not safe; (2) Installed on land The airtight gas tanks occupy a large amount of land resources, which is not conducive to the effective use of land resources that are currently in short supply; (3) is not conducive to the combination with offshore wind turbines

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