摘要
通过计算饱和指数(L.S.I)为-2.35(小于0),稳定指数(R.S.I)为11.7(大于7.5)判定出是严重腐蚀型的水质。用临界p H值方法测得水的实际p H值小于其临界p Hc值(即7.57<11.32),说明循环水不结垢,为腐蚀型水质。同时通过电化学及电感探针监测的方法验证,电化学测得循环水样的腐蚀速率为0.176 8 mm/a,电感探针测得的循环水样的腐蚀速率为0.162 8 mm/a,结果表明A炼油厂循环水质为严重腐蚀型水质。
The cooling water in refinery A contains not only dissolved oxygen but also a variety dissolved salts in cooling water. The suspended solids and microorganisms increase with the increase of concentration, which will inevitably cause corrosion and fouling of heat exchange equipment. Therefore, determination of eorrosivity and fouling tendency of water and associated effective control are very important for the safe stable operation of the unit. It is determined by computing the saturation index LSI = - 2.35 〈 0 and stability index RSI = 11.7 〉 7.5 that the water is a seriously corrosive water. The actual critical pH is measured to be less than the critical water pHc value （7.57 〈 11.32）, which indicates that the cooling water does not scale and is a corrosive type water. The monitoring and verification by inductance probe and electrochemical methods confirm that the corrosion rate of water samples measured by electrochemical method is 0. 1768mm/a and the cooling water corrosion rate measured by inductance probe is 0. 1628mm/a. The results show that the cooling water of the refinery is a seriously corrosive type water.
出处
《石油化工腐蚀与防护》
CAS
2016年第3期18-21,共4页
Corrosion & Protection In Petrochemical Industry
关键词
循环水
腐蚀
结垢
cooling water, corrosion, fouling
