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One of the major problems experienced in the development of filtration for coal liquefaction is the rapid clogging of fine metal filter screens. Tests have shown that the screens could be cleaned in situ and the frequency of such cleaning could be reduced by using precoats. Standard diatomaceous precoats could be used but these are expensive and their use could reduce the thermal value of the filter cake. Various carbonaceous products derived from coal and petroleum have been suggested as alternatives. Sixteen samples of coke have been assessed in laboratory tests. All have a good performance in terms of low cake resistivities, screen bridging, and effected considerable protection for metal screens against clogging. When used in plant tests as a 5mm precoat the petroleum coke fines effected a doubling of the intervals between in situ cleaning (sluicing) and also was resistant to particle breakdown during slurry recycle. Coal extract coke and carbonised coal used as filter aids in plant tests also doubled the interval between in situ cleaning, but they behaved similarly to celite in the breakdown tests, being inferior to cyclone fines in this respect. The use of carbonaceous materials as body feed leads to a marked decrease in filter cake resistivity and, therefore, to an increased efficiency of filtration area.

Additional information

Authors: JONES M A, British Coal Corporation, Coal Research Establishment, Cheltenham GL52 4RZ (GB);PASS R, Bergbau-Forschung GmbH, Postfach 130140, D-4300 Essen 13 (DE)
Bibliographic Reference: EUR 12257 EN (1989) FS, 46 pp., ECU 5
Availability: (2)
ISBN: ISBN 92-826-0675-9; CD-NA
Record Number: 198911159 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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