Accident Handling 15: How to prevent the wear-resistant material in the worn areas of a circulating fluidized bed boiler from falling off?

Answer: An appropriate wear-resistant material should be selected based on the environment in which the equipment is located; the material must be high-strength, fire-resistant, and wear-resistant, with good flexural strength. Reinforced fire-resistant and wear-resistant materials contain designed metal pins whose length extends essentially through the thickness of the fire-resistant layer, or stainless steel fibers are added to these materials. In this way, when cracks are formed due to uneven expansion, large-scale peeling does not occur. The maintenance of fire-resistant and wear-resistant materials is also important. If the furnace is heated with firewood, the refractory layer in the dense phase zone can generally be well maintained. If using an oil gun for furnace drying, a low-power atomizer must be employed to keep the temperature increase of the fire-resistant and wear-resistant materials within the limits permitted by the manufacturer. Curing inside the separator and return feeder is generally difficult; therefore, special drying oils and gases must be used, along with curing at a low temperature and at close range under good ventilation conditions. During furnace drying, it is crucial that the surface of the refractory layer reaches and exceeds the sintering temperature. In actually operating circulating fluidized bed boilers, it is essential to pay close attention to the maintenance of refractory materials. One should not solely focus on accelerating startup and rapid cooling after shutdown, thereby ignoring the temperature rise patterns of these refractory materials, which can cause fatal damage to them. It poses a serious risk to long-term stable operation in the future.

Appropriate wear-resistant materials should be selected based on the environment in which the equipment is located; these materials must be high-strength, fire-resistant, and wear-resistant, as well as possess good flexural strength. Reinforced fire-resistant and wear-resistant materials contain designed metal pins whose length extends essentially through the thickness of the fire-resistant layer, or stainless steel fibers are added to these materials. In this way, when cracks are formed due to uneven expansion, large-scale peeling does not occur. The maintenance of fire-resistant and wear-resistant materials is also important. If the furnace is heated with firewood, the refractory layer in the dense phase zone can generally be well maintained. If using an oil gun for furnace drying, a low-power atomizer must be employed to keep the temperature increase of the fire-resistant and wear-resistant materials within the limits permitted by the manufacturer. Curing inside the separator and return feeder is generally difficult; therefore, special drying oils and gases must be used, along with curing at a low temperature and at close range under good ventilation conditions. During furnace drying, it is crucial that the surface of the refractory layer reaches and exceeds the sintering temperature. In actually operating circulating fluidized bed boilers, it is essential to pay close attention to the maintenance of refractory materials. One should not solely focus on accelerating startup and rapid cooling after shutdown, thereby ignoring the temperature rise patterns of these refractory materials, which can cause fatal damage to them. It poses a serious risk to long-term stable operation in the future.