利用渣水系统处理脱硫废水的工程案例

为研究渣水系统低成本处理燃煤电厂脱硫废水的技术可行性与经济可行性，系统地研究了脱硫废水引入渣水系统后，捞渣机上清液、脱硫工艺水(复用水)的水质变化情况，以及对设备腐蚀、炉渣和石膏再利用的影响，并进行了经济性分析。结果表明，脱硫废水引入渣水系统后，复用水水质指标符合厂区回用水标准，且对炉渣和石膏的再利用没有明显影响，投资与运行成本较低，但存在增加设备腐蚀的风险。本研究结果可为该技术的工程应用及燃煤电厂的安全运行提供参考。

Engineering application of using slag water system to treat desulfurization wastewater

Desulfurization wastewater from coal-fired power plants is the most difficult waste water to treat in power plants. Although the amount of water is small, the treatment cost is high. In order to study the technical feasibility and economic feasibility of low-cost treatment of desulphurization wastewater from coal-fired power plants by the slag water system, this paper systematically investigated the changes of water quality of the liquid supernatant of slag-dredger and desulfurization process water (reused water) when the desulfurization wastewater was introduced into the slag water system, as well as the influence on the corrosion of equipment, the reuse of slag and gypsum, and carried on the economic analysis. The results show that, after the desulfurized wastewater was introduced into the slag water system, the water quality of the reused water met the standard of reclaimed water of plant, but the risk of corrosion and scaling of the equipment increased. In addition, the investment and operation cost of this process were obviously lower than that of other existing treatment processes for the treatment of desulfurization wastewater. The results can provide scientific basis and data reference for the zero liquid discharge treatment of desulfurization wastewater from coal-fired power plants with slag water system, and provide guidance for the safe and stable operation of power plants.