The power requirements for the FD fan of a fluidized bed boiler are ______ times _______ than other boiler designs?

The correct answer states that the power requirements for the FD fan of a fluidized bed boiler are three times more than those of other boiler designs. This is accurate due to the unique operational characteristics of fluidized bed boilers.

In fluidized bed combustion, the fuel particles are suspended in an upward flow of air, meaning that the fan must generate a substantial amount of air to lift and keep the bed of materials fluidized. This requires significantly higher power from the FD fan compared to conventional boilers, which generally do not utilize such a mechanism.

Fluidized bed boilers demand a higher volume flow rate and pressure to maintain the fluidized state of the particles, resulting in increased power requirements. Therefore, the relationship of three times more power for the FD fan compared to other boiler designs accurately reflects the increased workload and efficiency needed for effective operation in this specific type of boiler system.