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Ultrasound as an aid in drying fine coal.
Wilson JS; Moore AS; Bowie WS
Chem Eng Prog Symp Ser 1971 Jan; 67(109):68-73
Ultrasonic energy was investigated by the Bureau of Mines as an aid in drying fine coal fluidized with air at 300 deg. to 400 deg. F. Sound at frequencies of 17, 20.2, 35.5, 65, and 93 khz and amplitudes of about 135 db when applied in a 3-inch-diameter column aided water reduction from 10 to less than 1 percent by weight. Maximum increases in drying rates were achieved during the constant rate period, 46.9 percent when the sound was applied above the bed and 31.3 percent when it was applied below the bed.
OP; Journal Article
Issue of Publication
Chemical Engineering Progress: Symposium Series
Page last reviewed: October 8, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division