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US 5,296,005 AGranted
Process for converting coal into liquid fuel and metallurgical coke
AssigneeCoal Technology Corporation
InventorsRichard A. Wolfe, Chang J. Im, Robert E. Wright
Life of this patent
Estimating the term…
Abstract
A method of recovering coal liquids and producing metallurgical coke utilizes low ash, low sulfur coal as a parent for a coal char formed by pyrolysis with a volatile content of less than 8%. The char is briquetted and heated in an inert gas over a prescribed heat history to yield a high strength briquette with less than 2% volatile content.
Claims11
A method for producing metallurgical coke and liquid coal fuels from coal comprising the steps of:
- (a) selecting a parent coal with a low ash and low sulfur content equivalent to Pocahontas #3 coal;
- (b) reducing said parent coal to particulate;
- (c) pyrolyzing said particulate coal at about 1400.degree. F. in an inert gas to produce a char of less than 8% volatile matter content while extracting volatile coal liquids and other liquid;
- (d) condensing and recovering said coal liquids at a temperature above 215.degree. F.;
- and
- (e) forming calcined coke briquettes from said char, whereas said briquettes are formed with 60% char from said parent coal and 40% of a binder coal.
3 more elements
A method of forming coke from coal comprising the steps of:
- (a) selecting a parent coal having a low ash and low sulfur content;
- (b) reducing said coal to a char having less than 8% volatile content;
- (c) forming briquettes wherein said briquettes consist of about 60% by weight said char, about 30% binder coal, about 5%, tar;
- and about 5% pitch;
- and
- (d) subjecting said briquettes to a heat history wherein said briquettes are heat soaked at the maximum fluidity temperature of the briquette of about 850.degree. F. for a period and then heated at a higher temperature of about 1832.degree. F. for a second period prior to cooling.
3 more elements
Dependencies are inferred from the claim text.