Filtration of fly ash using a fluidized-bed filter.
This study focuses on the control of particulates with a fluidized-bed filter in exhaust gas stream. The fluidized-bed filter classified in the granular bed filtration technology was employed to demonstrate the performance for removal of fly ash at indicated operating velocities, fixed bed heights, and bed temperatures; then the collecting mechanisms of particulates by fluidized-bed filter were studied. The size distribution of fly ash passing through the fluidized-bed filter was also analyzed. The results indicate that at higher operating velocities and fixed bed heights, the removal of fly ash is more efficient and inertial impaction is the main mechanism when the fluidized-bed is operated at room temperature (25 degrees C). While operating at higher temperatures (200 degrees C), efficiency of 93.2% to 99.4% can be achieved for submicron particles. It is supposed to be the diffusion mechanism that is responsible for collecting such small particles, and high temperature is a favorable condition because of diffusion.
Chiang
Bo-Chin
BC
Department of Environmental Engineering, National Chung-Hsing University, Taichung, Taiwan, Republic of China.
Wey
Ming-Yen
MY
Liu
Kuang-Yu
KY
D000397:Air Pollution / Q000517:prevention & control*; D002244:Carbon; D003031:Coal; D060729:Coal Ash; D004058:Diffusion; D005374:Filtration; D007220:Industrial Waste; D010316:Particle Size; D052638:Particulate Matter; D013696:Temperature
D003031:Coal; D060729:Coal Ash; D007220:Industrial Waste; D052638:Particulate Matter; D002244:Carbon