CFB boiler water-cooled wall tube wear parts, a brief analysis of the reasons

In circulating fluidized bed boiler, there are airflow and jets with different directions, speeds, angles and concentrations, as well as corrosive gases and other related media, thus forming a complex wear environment.

In the dilute phase zone, the flying material is driven by the airflow to scour the heating surface at different angles; in the dense phase zone, the solid particles have large particle size, high flow velocity and high concentration, which form large angle scouring on the heating surface. The four corners of the furnace, due to the four corners of the wall friction resistance is the largest, gas-solid two-phase flow upward movement speed is small, thus forming a low-lying area of upward motion kinetic energy, wash the top to the high solid particles by their own gravity, most of them will move to the four corners of the region, in the four corners of the formation of high-speed falling material channel, resulting in serious wear of the four corners.

Horizontal flue near the mouth of the side grinding, in the cyclone separator under the action of negative pressure, the horizontal flue near the formation of vertical movement with the water-cooled wall tube of high-speed logistics, resulting in rapid wear of the windward side of the water-cooled wall tube. The severity of the degree of wear and flue gas speed, temperature and airflow strength, the temperature of the heated surface and other operating parameters, as well as the bed material particle size, hardness and particle shape.