Where is the severely worn heating surface of the circulating fluidized bed boiler and why?

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In the process of using the circulating fluidized bed boiler, the heating surface of the circulating fluidized bed boiler is seriously worn at the tail. There is a cyclone separator, but the concentration of fly ash entering the tail flue is still very high because the separator fails to collect it, reaching 4kg/m3. Since the efficiency of the separator deviates from the design efficiency in actual operation, there are many large particles entering the tail flue. , resulting in high wear intensity, increasing the degree of wear at this position. 2. The influence of the tube bundle design structure: According to the relevant data, the wear amount of the second row of the staggered tube bundle is about 2 times larger than that of the first row, and the wear amount of the staggered tube bundle is smaller than that of the staggered row. The local wear amount of the first row of staggered tube bundles is basically similar, between θ=45°～60°, while for the second row of staggered tube bundles, the local wear amount is between θ=30°～45° The larger the particle size, the smaller the θ angle. 3. High flue gas flow rate: According to the test, the wear rate is proportional to the nth power of the particle velocity. If the flue gas flow rate is equal to the dust particle velocity, n=3. The greater the flue gas flow rate, the dust particles are higher than the smoke. The air flow rate increases the wear of the heating surface at the tail of the circulating fluidized bed boiler such as the economizer.