US3916617A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of low BTU gas
Assignee: Boeing North American Inc
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Filing: 1974-03-29
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Granted: 1975-11-04
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Expires: 1994-03-29
Abstract
Abstract A process for partial oxidation and complete gasification of a carbonaceous material to produce a combustible gas containing a substantial proportion of carbon monoxide, by introducing the carbonaceous material and air as a preferred source of oxygen into a molten salt containing an alkali metal carbonate and preferably also an alkali metal sulfide, the system being operated preferably above atmospheric pressure, up to about 20 atmospheres. The air is employed in a proportion to provide less than about 60% of the amount of oxygen stoichiometrically required for complete oxidation of the carbonaceous material. Sulfur and ash introduced with the fuel are retained in the molten salt. The gaseous effluent, containing a weight ratio of carbon monoxide to carbon dioxide substantially greater than 1, is a low BTU gas. This gas can be reacted or combusted outside the molten salt in a second reaction zone, such as a conventional boiler, to recover the heat value of such gaseous effluent.
Inventors
- 👤 Donald E Mckenzie
- 👤 James R Birk
- 👤 Samuel J Yosim
- 👤 Donald A Huber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:58
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/57; C10J3/72; C10J3/74; C10J3/76; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/0916; C10J2300/092; C10J2300/093; C10J2300/0943; C10J2300/0946; C10J2300/0953; C10J2300/0956; C10J2300/0959; C10J2300/0983; C10J2300/0986; C10J2300/0996; C10J2300/16; C10J2300/1671; C10J2300/1675; C10J2300/18; C10J2300/1846; Y; Y02; Y02E; Y02E50/00; Y02E50/30; Y02P; Y02P20/00; Y02P20/10; Y02P20/129; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
219 words
A CONTINUOUS FOR GASIFYING COAL WHICH COMPRISES: A. PROVIDING IN A REACTION ZONE A MOLTEN SALT CONSISTING ESSENTIALLY OF A MAJOR PORTION OF SODIUM CARBONATE AND A MINOR PORTION OF FROM ABOUT 1 TO ABOUT 25 WT. PERCENT SODIUM SULFIDE, B. MAINTAINING SAID MOLTEN SALT AT A TEMPERATURE OF FROM ABOUT 1600*F TO ABOUT 2000*F, C. MAINTAINING FROM ABOUT 1 PERCENT TO 10 PERCENT CARBON IN SAID MOLTEN SALT, D. MAINTAINING SAID REACTION ZONE UNDER A PRESSURE OF FROM ABOUT 1 TO 20 ATMOSPHERES, E. CONCURRENTLY INTRODUCING INTO SAID CARBON-CONTAINING MOLTEN SALT A SULFUR AND ASH-CONTAINING COAL AND AIR, TUBE AIR BEING INTRODUCED INTO THE LOWER PORTION OF THE REACTION ZONE AT A SUPERFICIAL VELOCITY OF LESS THAN ABOUT 3 FT/SEC AND IN AN AMOUNT TO PROVIDE FROM ABOUT 35 PERCENT TO ABOUT 45 PERCENT OF THE AMOUNT OF OXYGEN STOICHIOMETRICALLY REQUIRED FOR COMPLETE OXIDATION OF THE INTRODUCED COAL, AND F. CONTROLLING THE CONDITIONS SET FORTH IN PARAGRAPHS (A)-(E) TO PROMOTE CARBON MONOXIDE PRODUCTION AND THERNALLY DECOMPOSE THE COAL TO PROVIDE A SUBSTANTIALLY SULFUR AND ASH-FREE COMBUSTIBLE, LOW BTU GASEOUS EFFLUENT CONTAINING VOLUME RATIO OF CARBON MONOXIDE TO CARBON DIOXIDE OF AT LEAST 5:1 AND HAVING VALUE WITHIN A RANGE OF FROM ABOUT 100-200 BTU/SCF, THE SULFUR AND ASH CONTENT OF THE COAL BEING RETRAINED IN THE MOLTEN SALT.
Claim 2
Dependent Claim
219 words
A CONTINUOUS FOR GASIFYING COAL WHICH COMPRISES: A. PROVIDING IN A REACTION ZONE A MOLTEN SALT CONSISTING ESSENTIALLY OF A MAJOR PORTION OF SODIUM CARBONATE AND A MINOR PORTION OF FROM ABOUT 1 TO ABOUT 25 WT. PERCENT SODIUM SULFIDE, B. MAINTAINING SAID MOLTEN SALT AT A TEMPERATURE OF FROM ABOUT 1600*F TO ABOUT 2000*F, C. MAINTAINING FROM ABOUT 1 PERCENT TO 10 PERCENT CARBON IN SAID MOLTEN SALT, D. MAINTAINING SAID REACTION ZONE UNDER A PRESSURE OF FROM ABOUT 1 TO 20 ATMOSPHERES, E. CONCURRENTLY INTRODUCING INTO SAID CARBON-CONTAINING MOLTEN SALT A SULFUR AND ASH-CONTAINING COAL AND AIR, TUBE AIR BEING INTRODUCED INTO THE LOWER PORTION OF THE REACTION ZONE AT A SUPERFICIAL VELOCITY OF LESS THAN ABOUT 3 FT/SEC AND IN AN AMOUNT TO PROVIDE FROM ABOUT 35 PERCENT TO ABOUT 45 PERCENT OF THE AMOUNT OF OXYGEN STOICHIOMETRICALLY REQUIRED FOR COMPLETE OXIDATION OF THE INTRODUCED COAL, AND F. CONTROLLING THE CONDITIONS SET FORTH IN PARAGRAPHS (A)-(E) TO PROMOTE CARBON MONOXIDE PRODUCTION AND THERNALLY DECOMPOSE THE COAL TO PROVIDE A SUBSTANTIALLY SULFUR AND ASH-FREE COMBUSTIBLE, LOW BTU GASEOUS EFFLUENT CONTAINING VOLUME RATIO OF CARBON MONOXIDE TO CARBON DIOXIDE OF AT LEAST 5:1 AND HAVING VALUE WITHIN A RANGE OF FROM ABOUT 100-200 BTU/SCF, THE SULFUR AND ASH CONTENT OF THE COAL BEING RETRAINED IN THE MOLTEN SALT.
Claim 3
Dependent Claim
55 words
The process as defined in claim 1, which includes pAssing said combustible gaseous effluent into a secondary combustor in the presence of air and completing combustion of said combustible gaseous effluent to convert carbon monoxide and hydrogen present substantially to carbon dioxide and water vapor, and recovering the heat of combustion in said secondary combustor.
Claim 4
Dependent Claim
71 words
The process as defined in claim 1, which includes initially compressing said air prior to introduction thereof into said molten salt, passing said combustible gaseous effluent from said molten salt into a secondary combustor in the presence of air and completing combustion of said combustible gaseous effluent, and employing said gaseous effluent from said molten salt or the combustion gases from said secondary combustor in a gas turbine to generate power.
Claim 5
Dependent Claim
26 words
The process as defined in claim 1 wherein in paragraph (c) there is maintained from about 3 percent to 7.5 percent carbon in said molten salt.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |