连续电解除盐模块的化学清洗工艺

Chemical cleaning technology of continuous electrodeionization module

华能河南中原燃气发电有限公司连续电解除盐模块运行4年后,产水电阻率下降到5MΩ.cm且出水中SiO2质量浓度达到了120μg/L,已不能满足生产要求。使用1.8%HCl,1.0%NaOH和5.0%NaCl的混合液分别对其进行了清洗,经过数天调试后恢复正常,#1,#2连续电解除盐模块产水电阻率分别达到18.26 MΩ.cm和17.30 MΩ.cm,效果非常理想。

After the continuous electrodeionization modules of Huaneng Henan Zhongyuan Gas Power Generation Company Limited operated for 4 years,the resistivity of the produced water decreased to 5 MΩ.cm,and the mass concentration of SiO 2 in the produced water increased to 120 μg / L,so the produced water can not meet the production requirement already.Using the mixed liquids of 1.8% HCl,1.0% NaOH and 5.0% NaCl,the electrodeionization modules were cleaned respectively.Through debugging for several days,the function of the modules returned to normal;and the resistivity of produced water of the electrodeionization modules No.1 and No.2 increased to 18.26 MΩ.cm and 17.30 MΩ.cm respectively,which are very ideal results.