直接空冷机组极高pH下高混长期稳定运行技术

Techniques of Long-term Stable Operation of High-speed Mixed Bed with High pH in Direct Air Cooling Unit

针对某电厂直接空冷机组给水p H提高至9.6~9.8后,精处理高速混床运行周期大幅缩短,甚至只有原来的20%的问题,采用树脂输送图像智能识别及控制仪,在不改变树脂分离设备结构的情况下,将阳阴树脂体积比由1:1调整为3:2,同時提高树脂输送精度,避免了阳阴树脂的"交叉污染",使树脂再生度能达到较高水平。实施后,2×600MW直接空冷机组精处理高混的平均周期制水量增加约70%,并且出水铁的质量浓度在3μg/L以下,Na^+和Cl^-的质量浓度均小于1μg/L,汽轮机无积盐、腐蚀及结垢等问题出现。

Aimed at the p H of water supply in direct air cooling unit raised up to 9.6~9.8 in a power plant,the operation cycle of the high-speed mixed bed for condensate water treatment would be significantly shortened,even to only 20%of the original.IRIC was used to adjust the cation and anion resin ration from 1：1 to 3：2 without changing the structure of resin separation equipment.Additionally,the resin transportation accuracy was improved to avoid the cross contamination of cation and anion resin and made the regeneration of resin in a high level.After implementation,the average cycle of water production of high-speed mixed bed in 2×600 MW air cooling direct unit increased by 70%,and the mass concentration of iron in effluent was less than3μg/L,the mass concentration of both Cl^-and Na~＋were less than 1μg/L.Moreover,there were no salt accumulation,corrosion and scaling problems of the steam turbine.