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US 4,396,394 AGranted
Method for producing a dried coal fuel having a reduced tendency to spontaneously ignite from a low rank coal
AssigneeAtlantic Richfield Company
InventorsYing-Hsiao Li, James L. Skinner, Donald K. Wunderlich, J. David Matthews, Bernard F. Bonnecaze
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Abstract
A method for producing a dried coal fuel having a reduced tendency to spontaneously ignite from a low rank coal by drying the low rank coal and thereafter cooling the dried coal to a temperature below about 100.degree. F. Optionally the dried coal is partially oxidized prior to cooling, and optionally the dried coal is mixed with a deactivating fluid.
Claims7
A method for producing a dried particulate coal fuel having a reduced tendency to spontaneously ignite from a particulate low rank coal, said method consisting essentially of:
- a. charging said particulate low rank coal to a coal drying zone wherein said coal is supported on a first support means, said first support means being adapted to the flow of a hot gas upwardly through said first support means and said particulate low rank coal;
- b. drying said particulate low rank coal in said coal drying zone by flowing a hot gas upwardly through said first support means and said particulate low rank coal to produce a dried coal;
- c. recovering said dried coal from said coal drying zone;
- d. charging said dried coal to a coal oxidation zone;
- e. contacting said dried coal with a free oxygen containing gas in said coal oxidation zone to produce a dried oxidized coal;
- f. recovering said dried oxidized coal from said coal oxidation zone;
- g. charging said dried oxidized coal to a coal cooling zone wherein said dried oxidized coal is supported on a second support means, said second support means being adapted to the flow of a cooling gas upwardly through said second support means and said dried oxidized coal;
- and,
- h. cooling said dried oxidized coal in said coal cooling zone by flowing a cooling gas upwardly through said dried oxidized coal to a temperature below about 100.degree. F. to produce a cooled dried, oxidized coal.
6 more elements
Dependencies are inferred from the claim text.