Gerald A Petersen

US Patent:

39908658, Nov 9, 1976

Filed:

Oct 21, 1974

Appl. No.:

5/516807

Inventors:

Alexander Cybriwsky - Greenfield WI
Gerald T. Petersen - Elm Grove WI

Assignee:

Allis-Chalmers Corporation - Milwaukee WI

International Classification:

C10J 300
C10J 316

US Classification:

48197R

Abstract:

A rotary kiln coal gasification process capable of processing caking coals wherein controlled agglomeration of the coal is permitted without adverse process effects. Caking coals have an agglomerating temperature range and while in this range the coal is in a semi-plastic state which causes individual particles to stick together on contact and form agglomerates. After passing through this agglomerating temperature range, during which most volatiles and tars are removed, a temperature is reached where the coal particles become less sticky and, with sufficient agitation and maintenance of bed temperature, the agglomerates will break up. In this process the temperature of the coal is increased at an accelerated rate to cause it to quickly pass through the agglomerating temperature range before excessive agglomeration occurs and adversely affects desired material flow through the kiln.