国华定州电厂循环冷却水阻垢缓蚀试验研究

Experimental study on scale and corrosion inhibition of circulating cooling water in Guohua Dingzhou power plant

对模拟国华定州电厂循环冷却系统补充水进行慢速脱碳试验、静态阻垢试验、腐蚀挂片试验确定了软化剂石灰、絮凝剂氯化铁、助凝剂聚丙烯酰胺及阻垢缓蚀剂的合适加药量。将羟基乙叉二膦酸、马来酸和丙烯酸共聚物、氨基三甲叉膦酸三种阻垢剂复配后使用,钙硬度和全硬度阻垢率均可达90%以上。钼酸钠和十二烷基苯磺酸钠作为复配缓蚀剂,缓蚀率可达90%以上。对经慢速脱碳处理后的模拟循环水加入合适添加量的阻垢剂后进行浓缩试验,可将浓缩倍率(以电导率计)提高至5.1以上。

Carried out a series of experiments to simulation circulating cooling system make-up water of Guohua Dingzhou power plant: slow decarburization experiment, static scale inhibition experiment,corrosion coupon experiment and determined the appropriate dosage of lime softener, flocculant ferric chloride, coagulant polyacrylamide, scale and corrosion inhibitor. The compound product of 1-Hydroxyethylidene-1,1-diphosphonic acid, maleic anhydride and acrylic acid and amino trimethylene phosphonic acid has the scale inhibiting rate reached 90%. The compound product of sodium molybdate and sodium dodecyl benzene sulfonate has the corrosion inhibiting rate reached 90%.The result of concentration experiment shows the concentration ratio (by conductivity) can increase to 5.1 or more under the appropriate dosage of scale inhibitor in the water of decarburization treatment.