C - Chemistry – Metallurgy – 10 – J
Patent
C - Chemistry, Metallurgy
10
J
44/1, 48/35
C10J 3/46 (2006.01)
Patent
CA 1076809
Abstract of the Disclosure Water-containing solid fuels, particularly brown coal or lignite, must be dried before conveying to a gasification reactor operating under pressure. A process is provided for treating the coal whereby water or steam is added to the coal to yield a mix- ture having a ratio of water to coal (computed on a dry basis) of approximately 2.5-3.5 to 1. The coal- water moisture is then maintained at a temperature of approximately 200-300°C and a pressure higher than that of the gasifier and in the range of about 15- 110 bars until the coal has substantially lost its colloidal structure and the water separates from the coal in liquid form. After separation from the water, the coal is transported to the gasifier. Preferably, the solid fuel used has a granular par- ticle size of about 0.1 to 10 mm and the coal-water mixture is pre-heated prior to pressurization. Op- tionally, the dried coal may be heated and/or lowered in pressure prior to entering the gasifier, and residual adhering water may be removed by post- treating with heated or unheated inert gas.
252352
Falkenhain Gerd
Huttner Rudolf
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