Research progress on waste heat recovery technology for flue gas and slurry after wet desulphurization
Efficient and deep utilization of low-grade waste heat is one of the key measures to promote further energy saving and emission reduction in coal-fired power stations.The low temperature saturated wet flue gas after wet desulphurization contains a large amount of latent heat and water resources,and the temperature of a large amount of desulphurization slurry rises after absorbing the flue gas heat.The flue gas and slurry have huge potential for waste heat utilization and water recovery,but discharging the flue gas and the slurry directly,will cause waste of resources and easily lead to"white plume"pollution.This paper takes the saturated wet flue gas and desulphurization slurry after wet desulphurization as the research object,and summarizes the domestic and foreign technologies and development directions for flue gas water heat recovery and slurry waste heat recovery after desulphurization,in response to the problems of low waste heat recovery efficiency and difficulty in matching cold sources in current wet desulfurization technology.Among them,direct condensing of flue gas and slurry,and heat pump technology are mature and widely used;solution absorption technology has high energy utilization rate and low corrosiveness of flue gas;flue gas membrane separation technology,slurry flash,heat pump technology are clean and environmentally friendly with high recovery quality.Direct condensing of flue gas and slurry,and membrane separation technology need to further improve corrosion resistance and exchange efficiency;slurry flash and heat pump technologies have high energy consumption;and membrane separation technology still needs to find efficient,safe and environmentally friendly non-toxic refrigerant.Finally,the main ways and problems of the current flue gas desulphurization(FGD)slurry waste heat utilization are discussed,and the recovered waste heat is mainly used for heating and internal heat utilization in power plants,with a view to further promoting the recovery and utilization of flue gas and slurry waste heat after wet FGD and realizing the deep energy saving and emission reduction in coal-fired power plants.
desulphurization slurrysaturated wet flue gaswaste heat recoverylow temperature waste heatwater and electricity saving
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