How long does it typically take to heat a fluidized bed to ignition temperature before introducing coal?

Heating a fluidized bed to ignition temperature is a critical step in ensuring efficient combustion of the coal that will later be introduced. The commonly accepted time frame for this process is approximately one hour. During this time, the fluidized bed is evenly heated, allowing for optimal conditions for the coal's ignition.

Achieving ignition temperature requires progressively increasing the temperature of the bed to a point where the coal particles, once added, can ignite and combust efficiently. Depending on the specific design and operational parameters of the fluidized bed system, a one-hour duration is standard for allowing sufficient time to reach the necessary conditions for effective combustion.

While other time frames may seem plausible, they either don't provide enough time to adequately heat the bed or extend the heating process unnecessarily, which could hinder operational efficiency. Thus, one hour is recognized as the most effective balance for preparing the fluidized bed for coal introduction.