Power generation system based on liquid air and method

Abstract

The invention discloses a power generation system based on liquid air and a method. The power generation system comprises a liquid air processing unit, a gas turbine power generation unit and a steamturbine power generation unit. In the peak period of power utilization, the liquid air is pressurized to the required pressure through a cryogenic pump, evaporated in a cold energy storage unit, and directly enters the gas turbine power generation unit for power generation without passing through a compressor after released cold energy is stored, and meanwhile high-temperature tail gas of a gas turbine enters the steam turbine power generation unit for power generation. In the valley period of power consumption, normal-temperature air is cooled through the cold energy storage unit, pressurizedthrough the compressor and then enters the gas turbine power generation unit for power generation, and meanwhile the high-temperature tail gas of the gas turbine enters the steam turbine power generation unit for power generation. Based on liquid air energy storage and cold energy recovery, storage and utilization, the power generation capacity and power generation efficiency of a gas turbine power generation cycle or a combined power generation cycle can be remarkably improved, and the peak regulation capacity of the power generation system is improved.

Description

technical field [0001] The invention belongs to the field of electric energy, and in particular relates to a power generation system and method based on liquid air. Background technique [0002] During the operation of the existing gas-fired power generation cycle or combined gas-steam power generation cycle, air needs to be introduced to realize fuel combustion and generate working fluid for the gas turbine. The ambient air needs to be pressurized to a high pressure by the compressor in advance, the compressed air is mixed with the injected fuel and burned to form a high-temperature and high-pressure gas, and the gas working medium with working ability enters the turbine device to expand and do work. However, the thermal efficiency of the existing single-cycle gas turbine is only about 35-40%, which is largely limited by the high power consumption of the compressor in the process of compressing air. The pressurization process of liquid air consumes little power compared to...

AI Technical Summary

Problems solved by technology

This has led to the fact that although the traditional power generation system has a relatively high installed capacity when it is put into construction, it cannot operate at full capacity for a long time, resulting in high investment costs and long payback periods.

Images