Integrated heat storage coal-fired power generation system and working method

Abstract

According to the integrated heat storage coal-fired power generation system and the working method, when a unit operates at a low load, a carbon dioxide compressor is driven by excess electric power to compress a carbon dioxide working medium to a high-temperature and high-pressure state, so that part of supplied water shunted by the coal-fired power generation system absorbs heat of carbon dioxide and then is conveyed to a hot water storage tank; and when the load of the unit is increased, the stored pressurized water working medium in the heat storage water tank is released and is heated to a saturated state through the low-temperature flue gas heat exchanger to replace steam extraction of a steam turbine to heat feed water, so that steam extraction is reduced, and rapid load increasing is achieved. The lower-load operation of the unit is realized, the variable load rate is improved, and the unit flexibility is improved. The low-temperature flue gas heat exchanger is arranged at the tail of the boiler, so that flue gas waste heat can be recycled.

Description

technical field [0001] The invention belongs to the technical field of power generation, and in particular relates to a coal-fired power generation system with integrated heat storage and a working method. Background technique [0002] At present, most of the wind energy and solar energy have strong intermittency and volatility, which need to be absorbed by the adjustment of coal-fired units. Therefore, higher requirements are put forward for the deep peak regulation and operation flexibility of coal-fired units. The flexibility of coal-fired power generating units means that the unit can greatly change the load and realize ultra-low load operation in the steady state, and can quickly increase and decrease the load during the transient process of changing conditions. However, in actual operation, affected by the minimum stable combustion load of the boiler and other operating conditions, the operating load range and variable load rate of the unit are limited. Therefore, how...

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Problems solved by technology

However, in actual operation, affected by the minimum steady combustion load of the boiler and other operating conditions, the operating load range and variable load rate of the unit are limited

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