C - Chemistry – Metallurgy – 10 – J
Patent
C - Chemistry, Metallurgy
10
J
C10J 3/56 (2006.01) C10J 3/20 (2006.01) C10J 3/26 (2006.01)
Patent
CA 2077029
SPLIT FLOW GASIFIER ABSTRACT OF THE DISCLOSURE A moving bed coal gasifier for the production of tar-free, low ammonia fuel gas. The gasifier described herein employs a combustion zone in a free-board area above the moving bed to burn coal fines to provide hot combustion gases for pyrolyzing and gasifying coal particulates in the moving bed to form fuel gas as the hot gases move co-currently with the downwardly moving coal particulates. The fuel gas contains entrained tars and ammonia compounds which contact hot char and ash in the moving bed and are cracked so that the fuel gas removed from the gasifier at a mid- point off-take is essentially tar-free and of low ammonia content. Concurrently with this gasification reaction, steam and an oxidant are introduced into a region below the moving bed to flow countercurrently to the downwardly moving bed to contact and react with carbon remaining in the char to create additional fuel gas which is also extracted from the gasifier at the mid-point off- take.
Finlayson & Singlehurst
Government Of The United States Of America As Represented By The
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