Size distribution of particulate emissions from a pressurized fluidized bed coal combustion facility

Abstract

Particle size distribution measurements were conducted on the emissions from the pressurized fluidized bed coal combustion test facility at the British National Coal Board, Coal Utilization Research Laboratory, Leatherhead England during September 1979. The particle size samples were taken on stream 1 downstream of the third stage cyclone and upstream of the cascade of turbine blades supplied by Stal Laval. The particle size distribution measurements were performed using an 11 stage Mark 5 University of Washington Source Test Cascade Impactor. The mass median aerodynamic particle diameter of the 14 size distribution tests ranged from about 1.6 to 3.4 μm with an average of around 2.5 μm. The geometric standard deviation of the log-normal approximation of the particle size distributions ranged from 2.3 to 3.6. The particle size distributions were very nearly log-normal in shape with the correlation coefficients between the actual and log-normal approximation ranging from 0.98 to 0.998 with an average of 0.992. The particle mass concentrations ranged from 0.39 to 0.69gm −3 at actual conditions (or 0.11 to 0.21 gm −3 at standard conditions)