How to prevent water-cooled wall wear problems in circulating fluidized bed boilers in power plants

　　Circulating fluidized bed boilers are widely used in the thermal power industry, mainly because of the advantages of circulating fluidized bed boiler fuel adaptability, low emissions and other advantages can greatly reduce the pollution of the local environment in power plants. However, circulating fluidized bed boilers are prone to wear problems on the water-cooled wall heating surface during actual operation, which seriously affects the safety and economy of the boiler.

　　Circulating fluidized bed boiler water-cooled wall wear problem has always been a headache for power plants, water-cooled wall wear problem not only seriously affects the safety and economy of the boiler, but also greatly improves the maintenance tasks of power plant staff, increasing the operating costs of the power plant. Many power plants have been seeking a technology that can completely solve the problem of water-cooled wall wear, before the grille anti-wear technology has been introduced and widely used, many power plants have chosen anti-wear beam, metal spraying and other anti-wear technology, these anti-wear technology has its own advantages, but still can not achieve a complete cure for the occurrence of circulating fluidized bed boiler water-cooled wall wear problem.

　　After research on multiple circulating fluidized bed boilers, it is found that the water-cooled wall wear has certain commonalities, and the wear areas are the same. Common wear location are concentrated in the furnace chamber dense phase area refractory material along the 0-5 m area of the water-cooled wall tube wear relative to the upper area points more, more serious wear, wear form are deep grooves and uniform thinning is the main; in the front and rear walls near the flue outlet level position, side walls, water-cooled screen appears to varying degrees of partial wear phenomenon.

　　The speed of the flue gas flow in the furnace chamber, flue gas concentration, the nature of the fuel, the boiler itself design influence, these will affect the circulating fluidized bed boiler water-cooled wall wear.

　　In order to help power plants completely solve the water-cooled wall wear problem, grill anti-wear technology was developed. Different from the traditional passive anti-wear technology such as spraying and anti-wear beam, the grille anti-wear technology is an active anti-wear technology. This technology has been applied in major power plants, and the anti-wear effect is thorough and recognized by major power plants, and has become the most mainstream anti-wear technology for circulating fluidized bed boiler water-cooled wall.