Temperature control variable working condition operation system based on heat accumulating type compressed air energy storage

Abstract

The invention discloses a temperature control variable working condition operation system based on heat accumulating type compressed air energy storage. The system realizes the change of the output power of the system by controlling the inlet temperature of an expansion machine, and can also realize the change of the input power of the system by controlling the inlet temperature of a compressor. According to the system, multi-temperature-zone heat storage is adopted, the requirements of the system for different temperatures are met, low-temperature heat storage comes from the air cooling capacity of an outlet of the expansion machine under low-load operation, medium-temperature heat storage comes from compression heat in a compression process, besides, in order to improve the energy density, the system output working condition range and the renewable energy source utilization rate of the system, the system converts fluctuating non-renewable energy sources into heat to be stored, the turbine inlet temperature is heated when needed, in the system, due to gradient utilization of the heat, the system efficiency can be improved under the condition of realizing wide working condition operation of the system.

Description

technical field [0001] The invention belongs to the fields of compressed air energy storage, cold storage and heat storage, renewable energy, etc., and relates to an energy storage system, in particular to a temperature-controlled and variable-working-condition operating system based on regenerative compressed air energy storage. An energy storage system that realizes the efficient operation of the system under wide working conditions and improves the absorption of renewable energy. Background technique [0002] The sustainable development of energy and environmental issues is the foundation of national economic development, and solving energy and environmental issues in the power industry is an important part of ensuring the sustainable development of our country's economy. Electric energy storage is one of the key technologies for adjusting my country's energy structure, developing renewable energy on a large scale, and improving energy security. The research on large-scal...

AI Technical Summary

Problems solved by technology

Among them, the range of variable operating conditions of the system under the means of compressor guide vane / diffuser adjustment and expander stator blade adjustment is limited, and valve throttling / pressure adjustment will cause large energy losses

In addition, other adjustment methods will come to technical or economic problems

In addition, renewable energy (such as wind energy, solar energy, etc.) itself generally has strong intermittency and volatility problems. The conventional compressed air energy storage system has limited ability to absorb renewable energy, and it can only absorb energy under a certain fluctuation frequency. and renewable energy within a certain load fluctuation range

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