Accident Handling 17: What are the factors that affect the wear of the tube walls in the heating surfaces of circulating fluidized bed boilers?

1. Effect of particle velocity； 2. Effect of particle concentration ； 3. Effect of particle diameter ； 4. The influence of bed material particle density, ash composition, and bed material shape on the wear of the heated surfaces.

The wear of components in circulating fluidized bed boilers is primarily related to the overall circulation pattern within the boiler, the flue gas velocity, the intensity of airflow turbulence, the flue gas temperature, the composition of the flue gas, the properties and particle size of the fuel, the particle concentration, their shape, as well as the unevenness of flow velocities. The higher the wind velocity, the more severe the wear; the greater the hardness of the coal, the more pronounced its cutting effect, and thus the greater the degree of wear. Furthermore, studies show that wear is proportional to the cube of wind speed and particle concentration. Due to the cyclic flow of large amounts of high-concentration material within the furnace, separator, and return device, certain areas, such as those where the flue gas changes direction, begin to wear out, and this wear gradually spreads throughout the entire furnace.