湿法脱硫系统水量平衡及节水方案

Analysis on Water Balance and Saving Schemes of Wet FGD System

以石灰石/石灰-石膏湿法脱硫系统为研究对象,对脱硫系统耗水量影响因素、节水措施及水量平衡情况进行分析,对大唐某电厂二期工程低温省煤器改造前后的湿法脱硫系统用水量进行了比较。数据表明,脱硫系统耗水量主要和脱硫系统蒸发水量有关,因此降低烟气进出吸收塔的温度差可以显著降低吸收塔蒸发水量达到深度节水的目的。针对西部空冷机组湿法脱硫系统耗水量占全厂用水量比重大的情况,提出了保持系统水量平衡的若干措施。

The influencing factors of water consumption,water saving methods and water balance are analyzed for the limestone/ lime-gypsum wet FGD system.Moreover,the comparison between the water consumption of the FGD system before and after the low-temperature economizer modification in the phase Ⅱ project of a power plant of Datang Group is conducted.It indicates that the water consumption in the FGD system is associated with the evaporated water in the absorber; the evaporated water can be decreased by reducing the gas temperature difference between the absorber inlet and outlet to realize in-depth water saving.According to the situation that water consumption in the wet FGD system of air-cooling units takes a large proportion of the overall water consumption of the plant in the west region,measures to keep the water balance are proposed.