一般烟囱内衬采用普通水泥砂浆砌筑,在烟囱长期运行过程中,烟气的SO_3冷凝为稀硫酸或亚硫酸,对内衬产生酸腐蚀,并首先在最薄弱的砌缝处向外渗透,进而腐蚀烟囱简体。华东电力设计院曾对上海地区6个火电厂的10座烟囱进行了调查分析,发现材料腐蚀是钢筋混凝土烟囱产生裂缝的主要原 The general chimney lining is made of common cement mortar. During the long-term operation of the chimney, the SO_3 of the flue gas condenses into dilute sulfuric acid or sulfurous acid, which causes acid corrosion to the lining and first penetrates outward at the weakest seam. And then corrosion chimney Simplified. East China Electric Power Design Institute conducted investigation and analysis of 10 chimneys in 6 thermal power plants in Shanghai and found that material corrosion is the main cause of cracks in reinforced concrete chimneys.