What is the typical particle size range for fluidized bed coal?

The typical particle size range for fluidized bed coal is primarily chosen based on the requirement to achieve effective fluidization while maintaining good combustion characteristics. In fluidized bed combustion, coal particles need to be small enough to allow for adequate fluidization and sufficient contact with air, yet large enough to prevent excessive elutriation (particles being carried away with the gas).

The range of 1.6mm - 0.6mm captures the nuances of balancing these requirements. Particles in this size range facilitate a stable fluidized bed that supports uniform burning, enhancing heat transfer and combustion efficiency. Smaller particles improve the surface area available for combustion, while larger particles help maintain the responsive behaviors of the bed during operation.

Particle sizes below this range can lead to issues like fouling and reduced efficiency, while sizes above may not provide adequate fluidization, resulting in zones of poor combustion. Hence, a size range like 1.6mm - 0.6mm is optimal for ensuring effective fluidized bed operation, making it the correct choice in this context.