F - Mech Eng,Light,Heat,Weapons – 26 – B
Patent
F - Mech Eng,Light,Heat,Weapons
26
B
34/10.1
F26B 3/00 (2006.01) F26B 3/22 (2006.01) F26B 17/00 (2006.01) F26B 23/00 (2006.01)
Patent
CA 1290937
Abstract Bulk material such as lignite, hard coal, peat, waste wood, clarifier sludge, waste sludge, contaminated earth, catal- ysts, zeolites and filter cake containing vaporizable ingredients, is conditioned by means of a vibrating plate conveyor divided into a heating zone and a drying zone, using an indirect heat exchange. The aim of the process is to condition bulk materials composed of particles of different sizes, ensuring a low energy consumption and minimizing the need for the required equipment. The bulk material is heated in the enclosed heating zone in the presence of the remaining steam pressure and at the final temperature under with- drawal of the vapour from this zone. In the downstream enclosed drying zone, the content of the vaporizable fractions contained in the bulk material is further reduced by indirect heating under the vapour withdrawal. The bulk material is separated several times into coarse and fine fractions, the fines being remixed with the coarse fractions which has a higher water content. The bulk material is mixed several times while being heated in said zones. The device required for the above process is a vertical vibrating- plate drier (1) which has a plurality of horizontal double-wall plates (2) and an external enclosure. A particular feature of said device is that some of the plates (6) in the drying section 8 have at least one slotted grid (21) required for separating the fines from the coarse fractions. Said process and device are suitable for drying hydrous bulk material such as crude lignite, the water content of which is reduced from 58 to 18%.
552812
Hederer Hartmut
Hillebrand Wolfgang
Kreft Manfred
Fetherstonhaugh & Co.
Hederer Hartmut
Hillebrand Wolfgang
Kreft Manfred
Uhde Gmbh
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