Energy-saving flue gas pollutant treatment system using waste heat of thermal power plant

Abstract

The invention provides an energy-saving flue gas pollutant treatment system using waste heat of a thermal power plant. The energy-saving flue gas pollutant treatment system comprises a flue gas cooler, a flue gas re-heater and a steam auxiliary heater, wherein an energy-saving branch for utilizing the waste heat of the thermal power plant is further arranged between the flue gas cooler and the flue gas re-heater; the energy-saving branch is provided with a first type absorption heat pump; the first type absorption heat pump comprises an absorber, a condenser, an evaporator and a generator. By virtue of the energy-saving flue gas pollutant treatment system using the waste heat of the thermal power plant, provided by the invention, steam can be greatly saved and supplemented; the loss of circulating water is reduced by the first type absorption heat pump, so that water resources are saved, and the energy consumption and the operation cost of the operation of the pollutant treatment system are greatly reduced.

Description

technical field [0001] The invention relates to a thermal power plant pollutant treatment system, in particular to an energy-saving flue gas pollutant treatment system utilizing waste heat from a thermal power plant. Background technique [0002] With the improvement of air pollutant emission standards for thermal power plants in my country, all newly built, under construction and active thermal power units need to adopt advanced flue gas clean emission technology to achieve ultra-low emission of air pollutants. According to the current technical level, the co-processing process of flue gas pollutants based on flue gas cooling and reheating technology is recognized as the main technical route to achieve ultra-low emissions from coal-fired power plants. [0003] Its working principle is that the flue gas cooling and reheating technology includes two gas-water heat exchangers, one is the flue gas cooler, which is usually located on the flue between the air preheater and the el...

AI Technical Summary

Problems solved by technology

When the thermal power unit is operating at full load, but in winter and other climates, the temperature of the exhaust gas flowing out of the air preheater is low or the thermal power unit is not operating at full load, resulting in low exhaust gas temperature and flue gas flowing out of the air preheater. When the flow rate is reduced, because the flue gas outlet temperature of the flue gas cooler and the flue gas reheater needs to be maintained at a state similar to that at full load, the heat obtained by the flue gas cooler cannot meet the needs of the flue gas reheater. Usually, it is necessary to add a certain amount of steam with certain parameters to heat the heat medium water flowing out of the flue gas cooler to ensure that the flue gas temperature at the outlet of the flue gas reheater reaches about 80°C

According to the actual operating experience of thermal power units that have been put into operation, when the load of thermal power units is lower, the amount of supplementary steam is more, and the energy consumption of the ultra-low emission treatment system for flue gas is greater

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