Waste heat recovery system of phase change heat exchanger in thermal power generation enterprise

Abstract

The invention belongs to the technical field of waste heat recovery of thermal power generation, and particularly relates to a waste heat recovery system of a phase change heat exchanger in a thermalpower generation enterprise. The waste heat recovery system comprises an air preheater, a dust remover, an induced draft fan, a desulfurization tower and a fan heater, the air preheater, the dust remover, the induced draft fan and the desulfurization tower sequentially communicate through pipelines, an air outlet of the fan heater communicates with an air inlet of the air preheater, and an air outlet of the air preheater is connected with a flue gas cooler through a pipeline, an air outlet of the flue gas cooler communicates with an air inlet of the dust remover, and an air outlet of the desulfurization tower is provided with a flue gas reheater. According to the waste heat recovery system, pollution emission can be effectively reduced, a heat exchanger after desulfurization can be added on a heat supply secondary water return side or a condensation water side, a good energy recovery effect can be achieved, waste heat can be further utilized to heat only cold air of a boiler, smoke temperature of an air preheater outlet is improved, and the utilization efficiency of thermal power generation energy is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery of thermal power generation, and in particular relates to a waste heat recovery system of a phase change heat exchanger in a thermal power generation enterprise. Background technique [0002] Thermal power generation enterprises use the heat generated by coal combustion to heat the boiler feed water to generate high-temperature and high-pressure steam, which drives the steam turbine to the generator to generate electricity. The whole process is an energy conversion process, where the heat energy released by coal is converted into electric energy. The conversion efficiency of heat energy restricts the economy of thermal power generation enterprises, especially the exhaust heat loss of steam turbines and the exhaust smoke loss of boilers account for a large weight. [0003] In thermal power plants, since there is no waste heat recovery system, the hot flue gas from the outlet of the air ...

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Problems solved by technology

[0003] In thermal power plants, since there is no waste heat recovery system, the hot flue gas from the outlet of the air preheater is generally discharged directly through the dust collector and the desulfurization tower through the exhaust pipe, resulting in huge waste and greatly reducing energy consumption. Utilization

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