Project Operating Conditions
The pulverizing system and air/flue gas system of thermal power generating units are critical to the stable operation of boilers. During long-term operation, components such as the coal mill separator, primary air pipes, inlet hot air ducts, and SCR reactor inlet flues are subjected to the combined effects of high-velocity dust-laden airflow scouring, particle erosion, and flue gas corrosion. Localized wear rates far exceed design expectations, leading to risks such as wall thinning, increased air leakage, and reduced operating efficiency, which directly threaten the safe and stable operation of the units. This anti-wear treatment project addresses the above high-wear areas by employing a combination of techniques including ceramic wear protection, hexagonal mesh wear-resistant lining, and silicon carbide coating application. The comprehensive solution fully resolves the wear challenges in the pulverizing and air/flue gas systems, ensuring long-term efficient operation of the units.
Construction Site Work
The construction site of this project is located at the unit maintenance site of Datang Liaoyuan Power Plant. Upon mobilization, our team first carried out safe ash removal and defect pretreatment on the accumulated ash and old repair steel plate areas on the top of the flue gas/air ducts, thoroughly cleaning floating dust, rust layers, and loose components from the working surfaces to create a clean and stable substrate for subsequent anti-wear construction. For the wear issue on the top of the coal mill separator, the wear-resistant ceramic anti-wear process was adopted, with ceramic tiles positioned, bonded, and fixed in strict accordance with the special construction plan. For the worn areas of the flue gas/air ducts, the composite anti-wear process of hexagonal mesh + wear-resistant coating was employed. The hexagonal mesh was first installed and secured by welding, followed by layered application of the wear-resistant coating to ensure uniform thickness and firm adhesion, forming a complete wear-resistant protective layer.
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