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针对循环冷却水运行过程中常出现的结垢与腐蚀问题,采用低频梯度电磁场对中水进行水质稳定试验。通过静态正交试验对电磁场运行参数进行优化,然后将其应用到循环冷却水动态模拟试验中。结果表明,非换热界面的结垢与腐蚀问题可以得到显著控制,污垢沉积率与腐蚀率分别由静态试验条件下56.85 mg/(cm2.月)、0.834 mm/a降低到动态试验条件下35.02 mg/(cm2.月)0、.136 mm/a,并有继续下降的趋势;换热界面的结垢现象严重,污垢沉积率达184.59 mg/(cm2.月),但腐蚀率可以得到显著控制,为0.158 mm/a。经XRD分析发现,中水中的大量Mg2+一方面抑制了电磁处理的阻垢作用,另一方面在电磁处理条件下可以促进铁表面形成致密的MgFe2O4保护膜,起到缓蚀作用。
Aiming at the scaling and corrosion problems often encountered in the operation of circulating cooling water, low-frequency gradient electromagnetic field was used to test the quality of the water. The parameters of the electromagnetic field are optimized by static orthogonal test and then applied to the dynamic simulation of circulating cooling water. The results show that the scaling and corrosion problems of non-heat exchange interface can be significantly controlled, and the deposition rate and corrosion rate of soil are reduced from 56.85 mg / (cm2. Month) and 0.834 mm / a under static test condition to 35.02 mg / (cm2. month) 0, .136 mm / a, and there is a tendency of descending. The scaling of the heat exchange interface is serious with the deposition rate of soil reaching 184.59 mg / (cm2. month), but the corrosion rate can be significantly Control, 0.158 mm / a. The XRD analysis showed that a large amount of Mg2 + in the water suppressed the scale inhibition effect of the electromagnetic treatment on the one hand, and on the other hand, it promoted the formation of a dense MgFe2O4 protective film on the iron surface under the electromagnetic treatment condition and played a role of corrosion inhibition.