The main factors affecting the wear of the heating surface of circulating fluidized bed boilers

        Circulating fluidized bed boilers are always high-efficiency, clean and energy-saving boilers with wide fuel applicability and low pollutant emission, which are more widely used nowadays. With the rapid development of industry, the domestic economic development is also getting better and better. But at the same time, environmental pollution problems are becoming more and more serious, and environmental protection policies around the world are becoming more and more strict. Many enterprises, especially like the thermal power industry, have been applying circulating fluidized bed boilers one after another.

　　Although circulating fluidized bed boilers have many advantages and can better meet modern industrial production. But also because of its own characteristics of circulating fluidized bed boiler, its furnace wear is much greater than the pulverized coal furnace. From the actual operation of circulating fluidized bed boilers put into operation in China at present, there is a general situation of boiler heating surface wear. It is difficult to ensure the long-term stable operation of the boiler, which seriously affects the economic benefits of enterprises.

　　Circulating fluidized bed boiler heating surface wear causes

　　Circulating fluidized bed boiler heating surface wear mechanism is different from the traditional pulverized coal furnace, we can simply see the circulating fluidized bed boiler wear as two wear. The first one is that the solid material moving upward in the furnace of circulating fluidized bed boiler moves in the opposite direction to the solid material moving downward along the wall in the furnace, which generates a vortex flow locally in the furnace of the boiler, resulting in wear in this area of the furnace of the boiler.

　　The second is that the material rises to a certain height along the four walls of the boiler furnace reflux process encounters a protrusion to produce a change in the direction of flow, thus producing a scouring of the boiler heating surface, resulting in the circulating fluidized bed boiler heating surface wear.

　　In addition, the circulating fluidized bed boiler heating surface is also related to the flue gas concentration, flue gas flow rate, ash particle characteristics, bed material height, the actual quality of the boiler installation, etc., all of which have different effects on the boiler heating surface wear. Circulating fluidized bed boiler wear types we can simply divide into: scouring wear, impact wear and micro-vibration wear.

　　According to the analysis of multiple circulating fluidized bed boiler heating surface wear, it is found that the wear degree of each part of the metal heating surface in the furnace is not uniform, and the biggest factors affecting the wear degree are mainly the speed of fuel particles in the furnace, eddy current and solid phase concentration.

　　To eradicate the wear problem of circulating fluidized bed boiler, not only can ensure the safe and smooth operation of circulating fluidized bed boiler, but also can avoid the economic loss caused by the wear of circulating fluidized bed boiler, and greatly improve the economic benefits of enterprises. For enterprises using circulating fluidized bed boilers, they should pay attention to boiler wear and actively choose the correct anti-wear measures for circulating fluidized bed boilers.