Bypass control system suitable for CAES system expansion unit

Abstract

The invention discloses a bypass control system suitable for a CAES system expansion unit. For the characteristics that all kinds of CAES systems are frequently started and stopped, and run in the variable working conditions, control regulation of all stages of pressure is achieved through changing setting of an expanding machine bypass channel and a valve structure, the starting time can be shortened, the starting condition is improved, the service life of an expanding machine is prolonged, on the other hand, in the running process, if the mechanical failures or instant load shedding happens,high-pressure gas can be rapidly vented through a bypass system, the unit can be suitable for frequent starting and stopping and rapid load increasing and decreasing, and finally, under the sliding pressure running working condition, the aim that the expansion ratio is in the expanding machine with the higher medium and low pressure frequency to do work is achieved. In addition, according to different air inlet (air storage) pressure of a CAES system and the different load requirements of a user side, the expansion unit running working condition can be effectively adjusted, the system can besuitable for running of the large-range variable working conditions, the variable working condition running range can be effectively improved, and the unit running efficiency can be improved while thesafety and the reliability are adjusted.

Description

technical field [0001] The invention belongs to the field of compressed air energy storage (CAES), and relates to a bypass control system of an expansion unit, in particular to a valve combination structure of a bypass pipeline in the CAES expansion unit. Background technique [0002] In recent years, with the country's emphasis on energy security and sustainable development, renewable energy such as wind energy and solar energy has developed rapidly, but wind energy and solar energy have greater volatility and instability. Energy storage technology is a major renewable energy The urgent need for large-scale utilization is also an essential key technology to improve the efficiency, safety and economy of conventional power systems, as well as smart grids and distributed energy systems, and is known as the supporting technology of the energy revolution. Compressed air energy storage (CAES) has the advantages of large energy storage capacity, long period, and small unit investm...

AI Technical Summary

Problems solved by technology

The high-pressure air directly drives the expander to start, which will cause a large impact, which is not good for the life of the equipment; on the other hand, if there is a mechanical failure or instantaneous load rejection during operation, due to the cavity effect, the residual high-pressure gas will still drive the expander at high speed. operation, which is not conducive to equipment safety; finally, under the sliding pressure operating condition, due to the sharp decrease in the total pressure ratio, the efficiency of the low-pressure stage drops sharply and even operates as a load condition, and the system efficiency deteriorates

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