选煤厂钢结构锈蚀原因分析

Analysis of the cause of steel structure corrosion in coal preparation plant

为了找到神东洗选中心选煤厂厂房钢结构锈蚀的原因,对选煤工艺各个环节的水质成分,主要包括电导率、pH、硬度、腐蚀离子的变化进行检测并分析;通过对45号碳钢在不同腐蚀液中碳钢表面和质量变化,研究对比各腐蚀因素对钢结构锈蚀产生的影响大小;对选煤厂厂房内不同工作区间的温度、湿度进行测量对比,研究其对钢结构锈蚀产生的影响作用。试验结果表明,选煤厂钢结构锈蚀是由多种因素共同作用造成的,水中氯离子、硫酸根等腐蚀离子含量较高,平均含量为391 mg/L;实测厂房内温度20~35℃,湿度80%,该温度和湿度加速了钢结构锈蚀,控制厂房内温度、湿度和水中腐蚀离子浓度是解决钢结构腐蚀的主要措施。

In order to find out the reason of steel structure corrosion in the workshop of Shendong coal preparation center,the changes of water quality,including electrical conductivity,p H,hardness and corrosion ion,were detected and analyzed.Based on the surface and quality changes of No.45 carbon steel in different corrosion solution,the influence of various corrosion factors on the corrosion of steel structure was studied and compared.The influence of temperature and humidity on the corrosion of steel structure was studied by measuring and comparing the temperature and humidity of different working areas in the workshop of coal preparation plant.The results show that the corrosion of steel structure in coal preparation plant is caused by many factors.The content of chloride ion and sulphate ion in water is high,and the average content is 391 mg/L.The measured temperature is 20-35 ℃ and the humidity is 80 ℃.This temperature and humidity accelerate the corrosion of steel structure.Controlling the temperature,humidity and the concentration of corrosion ion in water are the main measures to solve the corrosion of steel structure.