Coal processing to upgrade low rank coal having low oil content
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United States of America Patent
Stats
-
Mar 3, 2015
Grant Date -
Dec 6, 2012
app pub date -
Jun 3, 2011
filing date -
Jun 3, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method of treating untreated low calorific coal containing moisture and organic volatiles includes feeding untreated coal to a dryer, and drying the coal. The dried coal is subjected to a pyrolyzing step where oxygen-deficient gases are brought into contact with the coal, thereby lowering the volatile content of the coal and producing a stream of pyrolysis effluent gases. The pyrolysis effluent gases are subjected to a separation process to separate lean fuel gases from liquids and tars, wherein the separation process removes less than about 20 percent of the pyrolysis effluent gases as the liquids and tars, with the remainder being the lean fuel gases. The lean fuel gases are returned to the dryer combustor, the pyrolyzer combustor, or the pyrolyzer.
First Claim
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International Classification(s)
- 2011 Application Filing Year
- C10L Class
- 427 Applications Filed
- 313 Patents Issued To-Date
- 73.31 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- C10L Class
- 0 % this patent is cited more than
- 10 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Sep 3, 2026 |
