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What are the main causes of mechanical wear of circulating fluidized bed boilers

[2021-08-17]

(1) Flue gas flow rate. The flue gas flow rate is the most important factor affecting the wear of the inner wall of the furnace. Studies have shown that the amount of wear is proportional to the third power of the flue gas flow rate. The flue gas flow rate directly affects the kinetic energy of the flowing fly ash and the amount of ash particles impacting the inner wall of the furnace per unit time.

(2) Fly ash concentration. In the CFB boiler, when the fly ash cycle rate is high, the combustion efficiency can be improved and the heat transfer effect can be enhanced, but the cycle rate also determines the concentration of solid particles in the flue gas in the furnace, so the higher cycle rate It will cause serious abrasion of the inner wall of the furnace by the ash-containing flue gas flow. If the coal quality becomes worse, the ash content increases, and the amount of coal burned also increases, resulting in a sharp increase in the concentration of fly ash in the flue gas and increasing the wear of the separator lining.

(3) The impact probability coefficient of fly ash. This is related to the particle characteristics of fly ash. The larger the particle, the greater the possibility of impact.

(4) Ash wear characteristics. The wear characteristics of ash particles refer to the influence of ash hardness, temperature, shape and particle size. If there are many hard substances in the ash and the ash particles are coarse and angular, the wear characteristics of the ash particles will be enhanced.

(5) The amount of wear on the inner wall of the furnace is also affected by the uneven distribution of fly ash concentration and flow velocity in the flue gas.

(6) The amount of wear is related to the material of the heated surface and the lining. Under the same conditions, the better the wear resistance of the material, the smaller the amount of wear; vice versa.

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