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我公司的2~#锅炉为杭州锅炉厂1986年制造,锅炉型号为NG—35/39—M/1,额定蒸发量为35t/h,汽包工作压力为4.21MPa,并于1990年点火投运,锅炉给水采用阴阳离子交换后的软化水。有一段时期,锅炉给水pH值在6.5～8之间,达不到合格标准,铁及其腐蚀产物在锅炉受热面大量沉淀,导致锅炉受热面结有大量铁垢,造成严重的垢下腐蚀,使水冷壁管泄漏的情况多次发生。为了解决这个问题,我们往给水中加入液氨,以此来调节给水的pH值,使它达到8.8～9.3的范围内,从而防止给水对金属的侵蚀。
The 2 ~ # boiler of our company is manufactured by Hangzhou Boiler Plant in 1986, the boiler model is NG-35/39-M / 1, the rated evaporation is 35t / h, the working pressure of steam drum is 4.21MPa and fired in 1990 Yun, boiler feed water after the use of anion exchange softened water. For a period of time, the boiler feed water pH value between 6.5 to 8, failing to pass the standard, a large number of iron and its corrosion products precipitated in the heating surface of the boiler, resulting in boiler heating surface knot with a large number of iron scale, resulting in serious scale corrosion, Leakage of the water wall tube occurs many times. In order to solve this problem, we add liquid ammonia to the feedwater to adjust the pH of the feedwater to a range of 8.8-9.3 to prevent feedwater attack on the metal.