Wear-resistant technology of supersonic arc spraying for vertical water wall of circulating fluidized bed boiler for more than 2 years

       Boiler spraying, thermal spraying, supersonic arc spraying, boiler heating surface anti-wear and anti-corrosion, boiler water wall anti-wear spray, deflector installation, deflector anti-wear, wear-resistant plate installation, longitude and latitude anti-wear, grille anti-wear, CFB boiler anti-wear technology, circulating fluidized bed boiler anti-wear technology, boiler anti-wear technology

Shandong Shenteng Electric Power Construction Co., Ltd. my country is now the country that uses the most circulating fluidized bed boilers (CFB) in power plants in the world, and there are more than 2,000 large and small circulating fluidized bed boilers in operation. At present, the CFB boiler still has the problems of serious wear of the heating surface of the vertical water cooling wall and ineffective anti-wear measures. Many boilers will experience wear and tear of the water cooling wall tube and leakage after a short period of operation. Accidents due to vertical water wall wear are close to 50% of the total number of boiler shutdowns. The wear and tear of the pipes on the heating surface of the vertical water wall is one of the main reasons for the forced shutdown of the CFB boiler. The wear of the water wall is the most serious part of the circulating fluidized bed boiler. The actual operation of a large number of CFB boilers put into operation in the early stage has proved that the wear of the heating surface pipes occurs at a certain height (1 m ~ 2 m) above the end of the water wall wear-resistant material designed by the boiler manufacturer and in the corners of the furnace. The chance of tube bursting is greatest (especially for boilers that do not use yield tube technology for the water wall). Therefore, it is necessary to strengthen the anti-wear treatment for the heating surface with serious wear in the furnace. It is even more necessary to adopt effective supersonic arc spraying anti-wear technology. Supersonic arc spraying anti-wear technology: supersonic arc anti-wear spraying is currently the most advanced spraying construction method in the world. Our company has successfully developed super-hard wear-resistant arc spraying materials with better wear resistance. These wires are aimed at working surfaces that are subjected to both severe particle erosion and abrasive wear in high temperature environments. And the spraying material designed and manufactured by supersonic arc spraying process for effective strengthening. Evenly spray 8 to 10 times to make the coating thickness more than (0.8 to 1) mm (about 6 kg to 8 kg of wire material per square meter to reach this thickness), the coating must not appear bosses, and the edges need to be Smooth over. In terms of material design, foreign advanced technology is absorbed, and the agglomeration method is incorporated into the milling process for the first time. It ensures the homogeneity of the coating and overcomes the old problem of uneven distribution of the powder core. Practice has proved that the coating can withstand 2~3 years of running wear in the circulating fluidized bed boiler.