Wear Conditions and Anti-wear Measures in CDQ Waste-Heat Boiler

In the code dry quenching (CDQ) waste-heat boiler, flue gas, which contains large amounts of coke-powder particles, can wear the heating surface pipes badly, when rushing into the boiler. So the wear corrosion occurs. This paper analyzes the reason why wear erosion happens, lists wearing sections. This paper summarizes various of preventive measures, for instance, installing anti-wear tiles, improving structure, decreasing gas flue velocity, and so on. And divided the measures into three categories: (1) control gas flue velocity by improving the structure; (2) strengthen wearing sections; (3) coat with a layer of wear resistant material by thermal spraying technology. Because flue gas velocity and heating surface material are the main factors which have great influent on heating surface wearing, this paper gives more details about category (1) and category (3). In addition, the anti-wear measures are given, which are adopted in advanced foreign company (NSC, NKK, Thyssen) and native company (Hailu) separately. CDQ waste-heat boiler can run safely with the 3 methods adopted.