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

A technology of power generation system and integrated storage, applied in the directions of preheating, steam generation, feed water heater, etc., can solve the problems of limited operating load range and variable load rate of the unit, realize the recovery and utilization of flue gas waste heat, and widen the operating range , Improve the effect of variable load rate

Active Publication Date: 2022-07-22
HUANENG POWER INTERNATIONAL +2
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Problems solved by technology

However, in actual operation, affected by the minimum steady combustion load of the boiler and ot

Method used

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

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Embodiment Construction

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] see figure 1 , a coal-fired power generation system with integrated heat storage, including a coal-fired power generation system, the coal-fired power generation system includes a boiler 1, a high-pressure cylinder 2, a medium-pressure cylinder 3, a low-pressure cylinder 4 and a generator 5, and the boiler 1 is provided with low-temperature smoke Air heat exchanger 15, high pressure cylinder 2 is connected to medium pressure cylinder 3, medium pressure cylinder 3 is connected to low pressure cylinder 4, low pressure cylinder 4 is connected to generator 5, generator 5 is connected to carbon dioxide compressor 21, and the working fluid outlet of carbon dioxide compressor 21 is connected to high temperature The inlet of the heat source side of the heat exchanger 17, the outlet of the heat source side of the high temperature heat exchanger 17 is connected to the inlet...

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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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Application Information

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IPC IPC(8): F01K27/02F01D15/10F04B35/04F22B33/18F22D1/00F22D3/00
CPCF01K27/02F01D15/10F04B35/04F22B33/18F22D1/00F22D3/00
Inventor 马汀山石慧许朋江吕凯孙瑞强薛朝囡王妍邓佳严俊杰刘明王朝阳
Owner HUANENG POWER INTERNATIONAL
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