Incident Handling 11: What are the reasons for the asymptotic coking of the bed material in circulating fluidized bed boilers?
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What is the cause of asymptotic coking of the bed material in circulating fluidized bed boilers?
Answer: The reason for the asymptotic coking of the bed material in circulating fluidized bed boilers is: (1) poor quality in the manufacturing and installation of the air distribution device, or blockage of the holes in the air nozzles, resulting in uneven primary fluidization air flow. (2) Large lumps are present in the coal feed or return material, and the coal particles are too large; otherwise, the fluidization condition will be poor. (3) Improper control of operating parameters.
(1) The manufacturing and installation quality of the air distribution device is poor, or the small holes in the air nozzles are blocked, resulting in uneven primary fluidization air flow. (2) Large lumps are present in the coal feed or return material, and the coal particles are too large; otherwise, the fluidization condition will be poor. (3) Improper control of operating parameters.