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Filtration of fly ash using a fluidized-bed filter
Bo-Chin Chiang1, Ming-Yen Wey, Kuang-Yu Liu
1Department of Environmental Engineering, National Chung-Hsing University, Taichung, Taiwan, Republic of China.
Journal of the Air & Waste Management Association (1995)
|March 31, 2005
Summary
This study demonstrates fluidized-bed filters effectively remove fly ash from exhaust gases. Higher velocities enhance efficiency at room temperature, while higher temperatures favor diffusion for submicron particle capture.
Area of Science:
- Environmental Engineering
- Particulate Matter Control
- Filtration Technology
Background:
- Exhaust gas streams often contain fly ash, necessitating efficient particulate control.
- Granular bed filtration, specifically fluidized-bed filters, offers a promising approach for particulate removal.
Purpose of the Study:
- To evaluate the performance of fluidized-bed filters for fly ash removal.
- To investigate the particulate collection mechanisms within fluidized-bed filters.
- To analyze the size distribution of fly ash after filtration.
Main Methods:
- Utilized a fluidized-bed filter system for fly ash particulate control.
- Tested performance across various operating velocities, bed heights, and temperatures.
- Analyzed particulate size distribution and identified dominant collection mechanisms.
Main Results:
- Higher operating velocities and fixed bed heights improved fly ash removal efficiency.
- Inertial impaction was the primary collection mechanism at room temperature (25°C).
- At elevated temperatures (200°C), efficiencies of 93.2%–99.4% were achieved for submicron particles.
Conclusions:
- Fluidized-bed filters are effective for controlling fly ash emissions.
- Operating conditions significantly influence particulate removal efficiency and mechanisms.
- Diffusion mechanisms, enhanced by high temperatures, are crucial for submicron particle capture.