Granular filtration in fluidized-bed
- Department of Energy, Morgantown, WV (United States). Morgantown Energy Technology Center
Successful development of advanced coal-fired power conversion systems often require reliable and efficient cleanup devices which can remove particulate and gaseous pollutants from high-temperature high-pressure gas streams. A novel filtration concept for particulate cleanup developed at the Morgantown Energy Technology Center consists of a fine metal screen filter immersed in a fluidized bed of granular material. As the gas stream passes through the fluidized bed, a layer of the bed granular material is entrained and deposited at the screen surface. This material provides a natural granular filter to separate fine particles from the gas stream passing through the bed. Filtration performance of the filter was first reported at the 12th International Conference on Fluidized-Bed Combustion, which the filtration system was operating only at a batch mode. This paper presents work since then on a continuous filtration system. The two-dimensional, transparent fluidized-bed allowed clear observation of the general fluidized state of the granular material and the conditions under which fines are captured by the granular layer. A series of experiments were conducted at various ranges of operating conditions with two different bed materials: Acrylic powder and Millwood sand. During the experiments, fine sand was fed continuously to the bed through the powder feeder. Bed material and captured fine particles were withdrawn continuously through an overflow tube. Collection efficiencies over 99% were obtained with lower density bed material in a continuous flow model. Low filtration performance was experienced with heavier bed material and may be attributed to the failure of maintaining a sufficiently thick granular layer at the screen filter surface. Filtration performance as a function of particle size distribution and the pressure drop across the granular filter are also discussed in this paper.
- OSTI ID:
- 245033
- Report Number(s):
- CONF-950522--; ISBN 0-7918-1305-3
- Country of Publication:
- United States
- Language:
- English
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Granular filtration in a fluidized bed
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