Coal-fired thermal power plant waste heat and water recovery system and method with heat storage function

Abstract

The invention provides a coal-fired thermal power plant waste heat and water recovery system with a heat storage function. The system involves a boiler, an air preheater, multiple coolers, a dust remover, a desulfurizing tower, a flue gas condensation heat exchanger and a chimney which are sequentially arranged in the flue gas circulation direction; the multiple coolers are sequentially connectedin series, the heat exchange medium outlet temperature of the multiple coolers are sequentially reduced in the flue gas circulation direction, and the multiple coolers correspond to different heat using devices; and the system further comprises a thermocline heat storage tank and a heat supply network, wherein the hot water output end of the thermocline heat storage tank communicates with the heatsupply network, and the hot water input end of the thermocline heat storage tank directly or indirectly communicates with a heat exchange medium pipeline of the flue gas condensation heat exchanger and heat exchange medium pipelines of part of the coolers. According to the system, the gradient utilization on energy is achieved, the energy conservation, the water recovery and thermoelectric decoupling can be achieved at the same time, the unit waste heat and water recovery system efficiency is improved, and meanwhile the unit operation flexibility is improved.

Description

technical field [0001] The invention relates to the technical field of waste heat and water recovery in coal-fired thermal power plants, in particular to a system and method for recovering waste heat and water in coal-fired thermal power plants with heat storage. Background technique [0002] Coal-fired power generation is still the main power generation in my country. Improving the efficiency and operational flexibility of coal-fired power plants, reducing pollutant emissions and resource consumption are long-term concerns for coal-fired power plants. The recovery of waste heat from the exhaust of coal-fired power plants can reduce the heat loss of boiler exhaust, thereby improving the power generation efficiency of coal-fired power plants. At the same time, due to heating in the north and some enterprises needing steam, combined heat and power units are indispensable. [0003] Coal-fired power generation is still the main power generation in my country. Reducing pollutant...

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Problems solved by technology

[0004] The first purpose of the present invention is to provide a waste heat and water recovery system of a coal-fired thermal power plant with heat storage, which can solve the problem of insufficient waste heat recovery;

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