Coal gasification process

Details Coal gasification process Coal gasification process

C - Chemistry, Metallurgy

10

J

48/28

C10J 3/00 (2006.01) C10J 3/08 (2006.01) C10J 3/46 (2006.01) C10J 3/48 (2006.01) C10K 1/00 (2006.01)

Patent

CA 1126031

COAL GASIFICATION PROCESS (D#76,476 -F) ABSTRACT Coal or other high ash containing carbonaceous solid fuel is reacted with a free-oxygen containing gas, with or without a temperature moderator, in a down-flow partial oxidation gas generator to produce a stream of raw synthesis gas, fuel gas, or reducing gas. A large portion of the combustion residue, i.e., molten slag and/or particulate solids that is entrained in the down-flowing generated gas stream is removed by gravity when the gas stream is passed through a diversion chamber where the velocity of the gas stream is reduced and its direction is diverted. The separated solid material and molten slag pass down through an outlet in the bottom of the diversion chamber and into a pool of quench water below. Preferably, a small portion of the hot gas stream is passed through the bottom outlet of the diversion chamber to prevent plugging. The main gas stream leaving the diversion chamber through the side outlet passes upward through a solids separation zone, optionally including gas-gas quench cooling, cyclones, filters, im- pingement separators, or combinations thereof, where ad- ditional entrained solids are removed and where some cooling of the gas stream may be effected by impingement with a cooled cleaned recycle portion of the gas stream. Next, most of the sensible heat in the gas stream is recovered by the production of steam. The gas stream, with a substantially reduced solids content, is passed through the tubes of one or more shell-and-straight fire tube gas coolers. Each gas cooler has one or more passes on the shell and tube sides and is preferably in an upright position with fixed tube sheets.

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