Fluidized bed high-oxygen-concentration combustion method and system coupled with liquid oxygen energy storage peak regulation

The invention discloses a fluidized bed high-oxygen-concentration combustion method and system coupled with liquid oxygen energy storage and peak regulation, and the method comprises the following steps: high-concentration oxygen prepared by an air separation device is mixed with air, then enters a fluidized bed boiler, and is combusted together with inferior fuels which are difficult to combust, such as solid wastes and coal gangue. And after the generated flue gas is subjected to heat exchange through the radiation heat exchanger and the convection heat exchanger, part of the flue gas enters the hearth again as circulating flue gas, and the other part of the flue gas is discharged into the atmosphere. When the external electrical load is reduced, the high-concentration liquid oxygen produced by the air separation device is stored in the liquid oxygen storage tank, and the power output by the unit is reduced under the condition that the boiler load does not need to be greatly reduced. When the external elect