Wear-resistant measures for centrifugal exhaust fans

Thread Content

Based on the wear mechanism of the impeller, the following measures can be taken to improve the wear resistance of the inducer fan impeller. (1) Improve the dust removal efficiency of the flue gas system and reduce the dust content in the flue gas. Therefore, it is recommended that power plants carry out regular maintenance and inspections on the dust collectors to ensure their efficient operation. (2) Reasonably design the shape of the blade. Traditionally, the blades of the impellers in the Y4-73 type exhaust fans have an airfoil shape (see Figure 2); they consist of a blade tip, a working surface, a non-working surface, and reinforcing ribs. The drawback is that the blade tips tend to wear out easily. If the blade is modified to the structure in Figure 3, the above drawbacks can be avoided. The characteristic of this structure is that the blade consists of a working surface, a non-working surface, and reinforcing ribs, with the shape of the working surface remaining unchanged. During design, the working surface of the blade is appropriately thickened by 5~7 mm. If a strip-shaped wear-resistant layer is welded on the working surface, the wear resistance of the impeller can be further enhanced. (3) Apply a wear-resistant layer to the areas of the blade that are prone to wear, such as wear-resistant coatings like polyurethane. (4) Attach wear-resistant ceramic sheets to the areas of the blade that are prone to wear. (5) Install wear-resistant liners in the wear-prone areas of the blade, and then weld a wear-resistant layer on top of these liners; a wear-resistant layer is also welded at the inlet section of the blade. Here is a brief introduction to the third wear-resistant measure: 100% solid polyurethane coating is sprayed on the working surface and non-working surface of the blade, as well as on the areas of the blade tip that are prone to wear. 100% solid content, environmentally friendly, free of any volatile organic compounds ； It cures quickly, allowing for spraying and shaping on any curved or inclined surface as well as vertically, without the occurrence of sagging. It has a short gel time – walking strength is achieved within just a few dozen minutes. Excellent thermal stability, allowing long-term use at 93°C and withstanding short-term heat shock up to 350°C. Corrosion resistance, wear resistance: Excellent physical and chemical properties – such as tensile strength, elongation, flexibility, wear resistance, aging resistance, and corrosion resistance – enable its use for corrosion protection. Ranging from soft rubbers (Shore A30) to hard elastomers (Shore D90), it helps to reduce wear in material handling systems as well as provide corrosion protection. It has excellent corrosion resistance, being able to withstand the erosion of strong acids, strong bases, salts, oils, water, and other substances. Its wear resistance is also outstanding, being dozens of times greater than that of stainless steel and carbon steel, and far superior to that of rubber linings. It has advantages such as high resistance to salt spray corrosion and good freeze resistance. Very strong adhesion: to metal substrates such as copper, aluminum, steel, etc ； It exhibits excellent adhesion to non-metallic substrates such as concrete, wood, fiberglass, rubber, and polyurethane foam. Easy to apply: The application process is simple; it can be carried out at low temperatures, even at -50°C. It is not sensitive to humidity or temperature, and it causes no pollution. It can be sprayed in a volume ratio of 2:1. The thickness achieved in a single application can range from several hundred micrometers to several centimeters, eliminating the drawbacks associated with multiple applications in the past. Using a complete set of equipment, construction is convenient and highly efficient ； The design thickness requirement can be achieved with a single construction step, overcoming the drawbacks of previous multi-layer construction methods. The device comes with various switching modes. Practice has shown that the service life of wear-resistant impellers is at least 2 to 3 times longer than that of ordinary impellers, earning high praise from users. It reduces energy consumption and saves money.