The circulating fluidized bed boiler is a new type of furnace with high efficiency and low pollution developed after the chain furnace and pulverized coal furnace. Because of its high combustion efficiency, wide coal type adaptability, large load adjustment range, low nitrogen oxide emissions, and easy Desulfurization and other advantages are favored, and it has been widely used and promoted worldwide. However, the prominent wear problem seriously restricts the long-term economic operation of this furnace.
The abrasion of coal ash particles on boiler materials in circulating fluidized bed boilers belongs to the erosion of the particle flow, which includes the impact of particles on the materials in the furnace and the erosion of the materials by the high-concentration ash-containing air flow. The wear of circulating fluidized bed boiler materials largely depends on the size of the particles, the shape of the particles, the impact velocity, the angle of impact, the amount of feed, the strength and hardness of the particles, etc. In addition, the degree of wear is also related to the material of the impacted surface, and is also affected by fuel characteristics and operating parameters.
The easy-wearing parts of circulating fluidized bed boilers include heating surface pipes and refractory materials. The easily worn metal parts of the circulating fluidized bed boiler are the junction of refractory materials and the water wall, the irregular pipe wall area, the four corners of the water wall, the heating surface in the furnace, the heating surface of the furnace roof, the cyclone separator, and the convective heating surface of the tail. Wait.
There are many factors affecting the wear of circulating fluidized bed boilers. In specific practice, different situations should be combined, different anti-wear measures should be taken, and experience should be accumulated continuously to make the anti-wear technology of circulating fluidized bed boilers continue to mature and perfect.
Post time: Nov-04-2021