矿井水用于电厂循环冷却的阻垢剂优选研究

Optimization of scale inhibitor for mine water used in circulating cooling system of power plant

针对火力发电循环冷却水系统以矿井水为补充水引起的结垢问题,进行了阻垢剂优选实验。以挂片沉积法模拟循环冷却水系统换热表面的结垢过程,采用重量法对所得的结垢产物进行分析,优选出一种适用于特定矿井水水质的阻垢剂。结果表明,乙二胺四甲叉磷酸钠(EDTMPS)为优选阻垢剂,阻垢率最高能达到91.91%;同时发现,针对特定矿井水水质,添加单一碳酸钙垢型阻垢剂的效果欠佳,只有同时对碳酸钙和硫酸钙有阻垢效果的阻垢剂才能满足使用要求。

Aiming at the scaling problem caused by the use of mine water as supplementary water in the circulating cooling water system of thermal power generation,the optimization experiment of scale inhibitor is carried out.The scaling process on the heat exchange surface of the circulating cooling water system is simulated by means of the coupon deposition method,and the obtained scaling products are analyzed by the gravimetric method.A scale inhibitor suitable for specific mine water quality is found through optimization.Experimental results show that sodium ethylenediamine tetramethylene phosphate(EDTMPS)is the optimal scale inhibitor for mine water,which can achieve a scaling rate of 85%.It is also found that as for specific mine water quality,the effect of adding a single scale inhibitor on calcium carbonate is not good.Only the scale inhibitor with scale inhibition effect on both calcium carbonate and calcium sulfate can meet the use requirements.