Since the desulfurization system was put into operation in Heyuan Power Plant,the rise of moisture content of desulfurized gypsum have been observed several times with the maximum value as much as 50％,which has severely affected the dehydration,storage,transportation and utilization of the gypsum.In consideration of the design and operation of the desulfurization system,the probable causes are analyzed and finally the root cause is identified as the scale inhibitor in the drainage of the circulating water which is supplemented to the desulfurization process water.By replacing the process water temporarily and adding gypsum crystal seeds,the gypsum quality deterioration is now under control.Furthermore,by removing the scale inhibitor from the circulating water drainage,the problem has been completely solved.Consequently,the original water balance of the power plant is recovered with normal gypsum quality and zero wastewater discharge,and the technical level of environmental protection and the economic efficiency of the power plant are all improved.%河源电厂烟气脱硫系统自投运以来,脱硫石膏含水率多次升高,最高时达50％,使储存、运输及再利用受到严重影响.结合脱硫设计和运行情况,对可能引起此问题的多种原因进行分析并逐一排查,最终确认是脱硫工艺水所补充的循环冷却水排污水中的阻垢剂所致.通过对工艺水来源的临时更换和添加石膏晶种,有效遏制了脱硫石膏品质恶化.为使问题得到彻底解决,对原本作为脱硫工艺水源之一的循环冷却水排污水进行了“去阻垢剂”处理,在保证脱硫石膏正常的情况下恢复了全厂原有的水系统平衡,达到废水零排放,电厂的环保能力和经济效益均得到提高.
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