Feasibility study on the use of a rotating fluidized bed as a dust filter

Technical Report · Fri Sep 01 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6386865· OSTI ID:6386865

Pfeffer, R; Hill, F B

A brief survey was made of the characteristics of the rotating fluidized bed used as a filter for fine dusts and mists. A sample calculation of overall filtration efficiency was made for a rotating bed operating at minimum fluidization with a velocity of 4 m/sec and a g-loading of about 50. Account was taken of removal by the classical mechanisms of diffusion, interception, and inertial impaction. High efficiencies were found for dust particles as small as 1 ..mu..m. The rotating fluid bed filter should have approximately the same collection efficiency and pressure drop as the fixed and moving bed filters operating at the same velocity, but in addition should more readily permit continuous operation without clogging and with effective regeneration. The same sample calculation of filtration efficiency applied to the conventional 1-g fluid bed operating at 1.5 times the minimum fluidization velocity of 0.2 m/sec indicated lower collection efficiencies near 1 ..mu..m than for the rotating system. The low velocity - and corresponding low throughput - in the stationary system is required to avoid bubble formation which would tend to lower filtration efficiency because of bypassing. The possible harmful effect on filtration efficiency of reentrainment of dust particles at the high operating velocities of the rotating system as well as the helpful effect of triboelectrification will have to be determined by experiment.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: EY-76-C-02-0016
• OSTI ID: 6386865
• Report Number(s): BNL-50990
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
AIR FILTERS
DUSTS
EQUIPMENT
EXTRACTION APPARATUSES
FEASIBILITY STUDIES
FILTERS
FILTRATION
FLUIDIZED BED
GASEOUS WASTES
MIST EXTRACTORS
POLLUTION CONTROL EQUIPMENT
SEPARATION PROCESSES
USES
WASTES