电容膜吸附技术在火电厂间接空冷循环水系统的应用

Application of Electric adsorption Technology in indirect Air-cooled circulating Water system of Thermal Power Plant

电容膜吸附技术具有操作及维护简便、设备寿命长、能耗低、回收率高、无二次污染等优势,近几年来开始应用于污(废)水回用处理领域。以河北涿州京源热电有限责任公司间接空冷循环水系统中主机循环冷却水为处理对象,通过改变电容膜吸附装置操作条件,试验研究电导率、pH、钠离子、总硬度、总铁、铝离子浓度六个指标与处理电流的关系,探究电容膜吸附中试装置在处理主机循环冷却水时的最佳工况。试验结果表明:电容膜吸附中试装置处理主机循环水的最优电流为17A,在预处理时间30s、吸附时间420s、排污时间120s情况下,产水率为93.4%,电导率由8.12μS/cm最低降至0.9μS/cm(平均为3μS/cm),各离子去除率与操作电流大小基本呈正相关,其中钠离子与钙、镁离子去除率高于铝离子与铁离子。

Electric adsorption technology has the advantages of simple operation and maintenance,long equipment life,low energy consumption,high recovery rate and no secondary pollution.In recent years,it has been applied to the field of sewage(waste)water reuse and treatment.Taking the circulating cooling water of the main engine in the indirect air cooling circulating water system of Hebei Zhuozhou Jingyuan Thermal Power Co.,Ltd as the treatment object,the relationship between the conductivity,pH,sodium ion,total hardness,total iron and aluminum ion concentration and the treatment current was studied by changing the operating conditions of the electric adsorption device,and the optimum working condition of the electric adsorption pilot plant in the treatment of the circulating cooling water of the main engine was explored.The experimental results show that the optimal current of the electric adsorption pilot plant is 17A,the water yield is 93.4%under the conditions of pretreatment time 30s,adsorption time 420 s and discharge time 120s,and the conductivity decreases from 8.12μS/cm to 0.9μS/cm(the average removal rate of each ion of 3μS/cm),is positively correlated with the operating current,in which the removal rate of sodium ion,calcium and magnesium ion is higher than that of aluminum ion and iron ion.