包头某热电厂供热系统的腐蚀特性及防腐措施研究

Corrosion Characteristic and Anticorrosion Measures for Heat Supply System in a Thermal Power Plant at Baotou

针对包头某热电厂供热系统存在的软化水腐蚀问题进行了分析研究。结果表明,管道内壁的腐蚀为氧腐蚀,主要影响因素为DO(溶解氧),其次为pH值;为了解决腐蚀问题,提出了一种以异抗坏血酸钠为主要成分的复合缓蚀剂,复合配方中的各组分之间存在着协同作用,能很好地抑制具有较强腐蚀性软化水中设备的腐蚀。软化水水质pH值为10并且药剂浓度为150 mg/L时,碳钢的腐蚀率仅为0.0303 mm/a。

The corrosion of the hot water supply system in a thermal power plant in Baotou was an alyzed.Results showed that corrosion of the inner surface of pipe was oxygen corrosion, the main influencing factor were DO （dissolved oxygen） and pH value.In order to solve the corrosion prob lem, a new compound corrosion inhibitor with Sodium erythorbate as the main component was pro posed. Due to synergistic effect exists amongthe components of the compound ihibitor, therefore, the inhibitor can effectively enhance the resistance of the steel pipesto the corrosive softened water in the system. The corrosion rate of carbon steel may be lowered to only 0.0303 mm/a with a dose of 150 mg/L inhibitor for the soften water with pH 10.