Patent US3884649A successfully refreshed from Google Patents.
US3884649A
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Coal pretreater and ash agglomerating coal gasifier
Assignee: Gas Technology Institute
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Filing: 1973-10-29
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Granted: 1975-05-20
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Expires: 1993-10-29
Abstract
Abstract Caking coal is converted to fuel gas by treatment in specific pretreatment and gasification zones. Pulverized coal is first pretreated by a mild oxidation in a fluid bed, with heat removal, at a temperature of about 700*-800 *F. to destroy the caking properties of the coal. The resulting gases and the pretreated coal are then passed to a fluid bed gasification zone maintained at the same pressure as the pretreatment zone. The fluid bed is positioned in the lower portion of the gasification zone and converts the coal to a gaseous mixture consisting essentially of CO, H2, CO2, and CH4. However, small amounts of oils and tars are also evolved. The oils and tars in the gaseous mixture, are then thermally cracked in the upper portion of the gasification zone to produce a fuel gas relatively free of oils and tars. A specific feature of the pretreatment zone enables removal of high density inorganic materials.
Inventors
- 👤 Charles W Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:28
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/46; C10J3/54; C10J3/48; C10J3/50; C10J3/503; C10J3/52; C10J3/523; C10J3/56; C10J3/72; C10J3/86; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/0953; C10J2300/0956; C10J2300/0973; C10J2300/0976
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
186 words
A PROCESS FOR THE CONVERSION OF A FINELY DIVIDED CARBONACEOUS MATERIAL CONTAINING ASH TO A FUEL GAS HAVING A HEATING VALUE OF BETWEEN 100 - 300 BTU PER CUBIC FOOT WHICH COMPRISES: I. PRETREATING A FINELY DIVIDED CARBONACEOUS FEED MATERIAL BY MILD OXIDATION AT A TEMPERATURE OF ABOUT 700:-800:F FOR ABOUT 10 TO 30 MINUTES TO DESTROY AND CAKING PROPERTIES OF THE CARBONACEOUS FEED MATERIAL IN FLUIDIZED PRETREATMENT ZONE; II. SAID FLUIDIZED PREPTREATMENT ZONE BEING IN DIRECT FLUID COMMUNICATION WITH AN ADJACENT GASIFICATION ZONE; III. WITHDRAWING HEAT FROM THE PRETREATMENT ZONE BY INDIRECT HEAT EXCHANGE WITH WATER TO PRODUCE STEAM AND TO MAINTAIN SAID PRETREATMENT TEMPERATURE; IV. PASSING THE PRETREATED CARBONACEOUS MATERIAL AND THE RESULTANT GASES FROM THE UPPER PORTION F THE PRETREATMENT ZONE TO SAID GASIFICATION ZONE AND PASSING AT LEAST A PORTION OF THE STEAM PRODUCED IN SAID PRETREATMENT ZONE TO SAID GASIFICIATION ZONE; V. SAID GASIFICATION ZONE BEING MAINTAINED AT THE SAME PRESSURE AS THE PRETREATMENT ZONE; VI. MAINTAINING THE PRETREATED CARBONACEOUS MATERIAL AS A FLUIDIZED BED IN THE LOWER PORTION OF THE GASIFICATION ZONE AT CONDITIONS SUFFICIENT TO CONVERT SAID PRETREATED MATE-
Claim 2
Dependent Claim
186 words
A PROCESS FOR THE CONVERSION OF A FINELY DIVIDED CARBONACEOUS MATERIAL CONTAINING ASH TO A FUEL GAS HAVING A HEATING VALUE OF BETWEEN 100 - 300 BTU PER CUBIC FOOT WHICH COMPRISES: I. PRETREATING A FINELY DIVIDED CARBONACEOUS FEED MATERIAL BY MILD OXIDATION AT A TEMPERATURE OF ABOUT 700:-800:F FOR ABOUT 10 TO 30 MINUTES TO DESTROY AND CAKING PROPERTIES OF THE CARBONACEOUS FEED MATERIAL IN FLUIDIZED PRETREATMENT ZONE; II. SAID FLUIDIZED PREPTREATMENT ZONE BEING IN DIRECT FLUID COMMUNICATION WITH AN ADJACENT GASIFICATION ZONE; III. WITHDRAWING HEAT FROM THE PRETREATMENT ZONE BY INDIRECT HEAT EXCHANGE WITH WATER TO PRODUCE STEAM AND TO MAINTAIN SAID PRETREATMENT TEMPERATURE; IV. PASSING THE PRETREATED CARBONACEOUS MATERIAL AND THE RESULTANT GASES FROM THE UPPER PORTION F THE PRETREATMENT ZONE TO SAID GASIFICATION ZONE AND PASSING AT LEAST A PORTION OF THE STEAM PRODUCED IN SAID PRETREATMENT ZONE TO SAID GASIFICIATION ZONE; V. SAID GASIFICATION ZONE BEING MAINTAINED AT THE SAME PRESSURE AS THE PRETREATMENT ZONE; VI. MAINTAINING THE PRETREATED CARBONACEOUS MATERIAL AS A FLUIDIZED BED IN THE LOWER PORTION OF THE GASIFICATION ZONE AT CONDITIONS SUFFICIENT TO CONVERT SAID PRETREATED MATE-
Claim 3
Dependent Claim
29 words
A process as in claim 1 wherein said ash is agglomerated in the bottom portion of the gasification zone at a temperature above the temperature of the fluidized bed.
Claim 4
Dependent Claim
60 words
A process as in claim 2 wherein said gaseous mixture includes fine and coarse particulate material and said mixture is separated to provide a fine particulate fraction and a coarse particulate fraction, said coarse particulate fraction being passed to said fluidized bed in the gasification zone and said fine particulate fraction passed to the bottom portion of the gasification zone.
Claim 5
Dependent Claim
32 words
A process as in claim 1 wherein said finely divided carBonaceous material includes higher density inorganic material, said higher density material being withdrawn from the lower portion of said fluidized pretreatment zone.
Claim 6
Dependent Claim
31 words
A process as in claim 1 wherein the fluidized bed in said gasification zone is maintained at a temperature of greater than 1500*F and below the agglomeration temperature of the ash.
Claim 7
Dependent Claim
13 words
A process as in claim 1 wherein said carbonaceous material is bituminous coal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |