13 August 2022

Bed slumping of AFBC Boiler

Bed slumping of AFBC Boiler

Bed slumping of AFBC Boiler

Closing the plenum damper of individual compartment along with fuel supply cut off to avoid any fluidization in that compartment is the process of bed slumping. The nature of a fluid bed ensures that mal-distribution is not likely to occur. Fuel migration through the bed is fast and even. Air distribution is insured by the designed configuration and location of the air nozzles. The bed combustion can be stopped instantly by turning off the air supply to the bed. This action results in the bed slumping, thereby smothering combustion. The bed is inherently safe because it contains only 3-5% combustible material as a maximum. This is evenly distributed throughout the inert bed material. When slumped, the bed is safe and permits an easy restart even after several hours simply by re-introducing the airflow into the bed. This is possible because of the substantial quantity of entrained heat in the bed material. The furnace is located atop the air distribution plenum.

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