Gasification process for carbonaceous materials

Details Gasification process for carbonaceous materials Gasification process for carbonaceous materials

1983-01-14

1984-04-24

Kratz, Peter F.

Gas: heating and illuminating

Processes

Fuel mixtures

48202, C10J 346, C10J 354

Patent

active

044445695

ABSTRACT:
A carbonaceous material, such as coal, is gasified in a vertically elongated reaction vessel having a lower portion, an upper portion, and a re-entrainment zone which is located above the upper portion. The effective diameter of the upper portion of the vessel is larger than that of the lower portion of the vessel and the re-entrainment zone. A gasification agent is passed upwardly through the vessel at a rate sufficient to entrain the coal and fluidize a heat-transfer material in the lower portion of the vessel. The gasification agent reacts with the coal to form a hot char and a gaseous product, with the necessary heat being supplied by the heat-transfer material. In this process, the heat-transfer material substantially flows downwardly in the reaction vessel, in a fluidized state or an unfluidized state through the upper portion of the vessel and in a fluidized state through the lower portion of the vessel. The coal substantially flows upwardly in the reaction vessel, in an entrained state through the lower portion of the vessel and the re-entrainment zone, and in a fluidized state through the upper portion of the vessel. An advantage of this process is that the upper portion serves to increase the residence time of the carbonaceous solids in the reaction vessel thereby increasing yields and lowering the average height of the reaction vessel, and the sensible heat is extracted from the product gas before it leaves the reactor.

REFERENCES:
patent: 2631921 (1953-03-01), Odell
patent: 2686113 (1954-08-01), Odell
patent: 3884649 (1975-05-01), Matthews
patent: 4157245 (1979-06-01), Mitchell et al.

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