Method for producing a dried particulate coal fuel from a particulate low rank coal
AssigneeAtlantic Richfield Company
InventorsLouis P. Riess, Bernard F. Bonnecaze
Life of this patent
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Abstract
A method for producing a dried particulate coal fuel having a reduced tendency to spontaneously ignite from a low rank coal by drying the low rank coal in a fluidized bed, cooling the resulting dried coal in a fluidized bed cooler, separating coal particles smaller than about 80 Tyler Mesh from the cooled dried coal and treating the cooled dried coal with a deactivating fluid.
Claims11
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 coal to a coal drying zone;
- (b) supporting a bed of said coal above a support means in said coal drying zone, said support means being adapted to the flow of hot fluidizing gas upwardly through said support means and said coal;
- (c) flowing hot fluidizing gas upwardly through said support means and said coal at a rate sufficient to fluidize said coal to dry said coal to a water content of less than about 14 weight percent water;
- (d) recovering dried coal from said coal drying zone;
- (e) cooling said dried coal to a temperature below about 100.degree. F. in a coal cooling zone;
- (f) separating at least a major portion of the finely divided coal particles of a size less than about 80 Tyler Mesh from said dried coal;
- and
- (g) treating said dried coal with a deactivating fluid to reduce the tendency of said dried coal to spontaneously ignite.
In 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 coal to a coal drying zone;
- (b) supporting said coal above a support means in said coal drying zone, said support means being adapted to the flow of hot fluidizing gas upwardly through said support means and said coal;
- (c) flowing hot fluidizing gas upwardly through said support means and said coal at a rate sufficient to fluidize said coal to dry said coal to a water content of less than about 14 weight percent water;
- (d) recovering said coal from said coal drying zone;
- (e) cooling said dried coal to a temperature below about 100.degree. F. in a coal cooling zone and treating said dried coal with a deactivating fluid to reduce the tendency of said dried coal to spontaneously ignite,
- an improvement comprising separating at least a major portion of the finely divided coal particles of a size less than about 80 Tyler Mesh from said dried coal prior to treating said dried coal with said deactivating fluid.
Dependencies are inferred from the claim text.