System and method based on middle gas suction of compressor and used for liquefied air energy-storage peak regulation

Abstract

The invention discloses a system and method based on middle gas suction of a compressor and used for liquefied air energy-storage peak regulation. The system is composed of a first steam turbine unit,a second steam turbine unit, a steam condenser, a refrigeration compressor, an air compressor, a cascade refrigeration / cold storage system, a liquid air storage tank, an air heating device, an air expander and a control valve. The running method of the system comprises an energy-storage mode and an energy-release mode. According to the system, the cascade refrigeration / cold storage system is driven by virtue of redundant steam, so that the energy transfer loss is reduced, and the cryogenic production cost is greatly reduced; a small part of air from an outlet of the air compressor is cooled to a certain extent through the cascade refrigeration / cold storage system, and then re-enters into different working levels in the air compressor, so that the temperature rise and power consumption ofa compression process are reduced, and the energy-storage efficiency of the system is increased; and meanwhile, an interstage cooler does not need to be arranged again, so that the system investment and the floor area are reduced.

Description

technical field [0001] The invention belongs to the technical field of energy storage peak regulation, and specifically relates to a liquefied air energy storage peak regulation system and method based on compressor intermediate suction, which is suitable for various thermal power plants with coal-fired units as typical, and can improve the efficiency of coal-fired units. Peak shaving capability and economy of energy storage system. Background technique [0002] At present, my country's wind energy, solar energy and other renewable energy sources are developing rapidly year by year. In addition, the electricity consumption of the whole society is increasing year by year, and the peak-to-valley difference in power consumption of the power grid is increasing. [0003] At present, the technologies to improve the peak-shaving capability of coal-fired units mainly include electric boiler heat storage technology, water tank heat storage technology, steam turbine steam process tran...

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Problems solved by technology

[0003] At present, the technologies to improve the peak-shaving capability of coal-fired units mainly include electric boiler heat storage technology, water tank heat storage technology, steam turbine steam process transformation technology, electrochemical battery energy storage technology, etc. Electric boiler heat storage technology is to convert electric energy into heat energy. It is used for heating and has strong peak-shaving ability, but the energy quality is greatly reduced, and it is only suitable for cogeneration units. Water tank heat storage technology and steam turbine steam process transformation technology have better thermal economy and relatively low investment, but the peak-shaving ability is limited. , and is only applicable to combined heat and power units. Electrochemical battery energy storage technology has fast response, small size, and short construction period, but has short life, high average cost, and high safety risk. Whether it is suitable for large-scale energy storage implementation still needs engineering demonstration verification

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