To burn coal in a fluidized bed boiler, the inert bed material must be heated to about how many degrees Celsius?

To effectively burn coal in a fluidized bed boiler, heating the inert bed material to a temperature range of approximately 500 to 700 degrees Celsius is essential. This temperature facilitates the optimal combustion of coal particles by creating the necessary conditions for fluidization. At this temperature, the inert material can support combustion efficiency and minimize emissions by promoting thorough mixing and ensuring even heat distribution.

Fluidized bed combustion operates on the principle of suspending the solid fuel (in this case, coal) in the hot inert bed material, usually composed of sand or ash. The heat from the inert bed is crucial for igniting the coal and sustaining the combustion process. The specified temperature range allows for effective heat transfer and combustion kinetics required for the burning process.

Temperatures lower than 500 degrees Celsius may lead to incomplete combustion, while exceeding 700 degrees Celsius can cause issues related to slagging and increased wear on boiler components. Thus, maintaining the bed material within the 500 to 700 degrees Celsius range ensures both efficiency and operational reliability in fluidized bed boilers using coal as fuel.