Deep recovery device for flue gas heat of power station boiler and method of deep recovery device

Abstract

The invention discloses a deep recovery device for flue gas heat of a power station boiler and a method of the deep recovery device. The recovery device comprises an air preheater, a sensible heat exchanger, a desulfurization tower, a latent heat exchanger, a flue gas heater, a plate heat exchanger, a lithium bromide absorption heat pump generator, a lithium bromide absorption heat pump condenser,a lithium bromide absorption heat pump evaporator and a lithium bromide absorption heat pump absorber. Compared with an existing thermal power plant flue gas heat recovery system, by the adoption ofthe deep recovery device and the method, on the premise of satisfying the user load, by adopting the coupling use of the lithium bromide absorption heat pump and a low-pressure heater, sensible heat of flue gas after the air preheater in a thermal power plant can be recycled, and latent heat of vaporization of moisture in flue gas after the desulfurization tower can be also recycled, so that the coal consumption for power generation is reduced, meanwhile moisture carried by flue gas is reduced, colored smoke plume is eliminated, and the device and the method better respond to the policy requirements on energy saving and emission reduction in China.

Description

technical field [0001] The invention relates to the technical field of energy saving and emission reduction in thermal power plants, in particular to a deep recovery device and method for waste heat exhausted by power plant boilers. Background technique [0002] As of the end of 2017, China's total installed capacity was 1,777.03 million kilowatts, of which thermal power was 1,106.64 million kilowatts, accounting for 62.27%; in 2017, power generation was 6,417.9 billion kwh, of which thermal power was 4,551.3 billion kwh, accounting for 70.92%. It can be seen that thermal power still occupies a dominant position in the domestic power market, while power plant boilers consume a large amount of fossil energy. The incidental losses caused by flue gas exhaust from power plant boilers account for 50% of the total losses of the boiler, and at the same time account for about 3%-6% of the boiler’s input fuel heat; if the boiler flue gas discharge temperature is effectively reduced b...

AI Technical Summary

Problems solved by technology

In actual operation, affected by the low temperature of the low-temperature heat source, a type of lithium bromide absorption heat pump has problems such as difficulty in starting at low temperature and serious heating attenuation. In severe cases, the COP of the heat pump is only 1

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