US4851013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasification process
Assignee: Shell USA Inc
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Filing: 1987-12-29
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Granted: 1989-07-25
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Expires: 2007-12-29
Abstract
Abstract A process for monitoring the conditions in the reaction zone of a gasifier in a process for the gasification of coal to produce synthesis gas is disclosed, the process being characterized by continual or periodic calculation of the rate of steam production by the heat exchange system of the gasifier, and comparison of the calculated rate with a pre-selected value.
Inventors
- 👤 Hans-Wolfgang Luke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:34
CPC Classifications
C; C10; C10J; C10J3/00; C10J3/72; C10J3/86; C10J3/46; C10J3/723; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/16; C10J2300/1687; C10J2300/18; C10J2300/1846; C10J2300/1861; C10J2300/1892; Y; Y10; Y10S; Y10S48/00; Y10S48/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A process for the gasification of coal comprising feeding particulate coal and oxygen to a gasifier operating under conditions to produce synthesis as, the reaction one of said gasifier being at least partly bounded by a wall or walls through which heat generated in the reaction zone is transferred through to water to form steam, and producing hot synthesis gas, and steam; monitoring the conditions int he reaction zone by continually or periodically measuring the steam flow rate from the wall or walls of the gasifier and calculating the rate of steam production therefrom, and comparing the calculated rate of steam production with a pre-selected value of steam production rate.
Claim 2
Dependent Claim
110 words
A process for the gasification of coal comprising feeding particulate coal and oxygen to a gasifier operating under conditions to produce synthesis as, the reaction one of said gasifier being at least partly bounded by a wall or walls through which heat generated in the reaction zone is transferred through to water to form steam, and producing hot synthesis gas, and steam; monitoring the conditions int he reaction zone by continually or periodically measuring the steam flow rate from the wall or walls of the gasifier and calculating the rate of steam production therefrom, and comparing the calculated rate of steam production with a pre-selected value of steam production rate.
Claim 3
Dependent Claim
124 words
A process for the gasification of coal comprising feeding particulate coal and oxygen to a gasifier having a reaction zone operating under conditions to produce synthesis gas, the gasifier comprising a walled chamber comprising a multiplicity of heat exchange tubes composing, partly composing, or surrounding the wall or walls bounding said reaction one, water being passed through said tubes to remove heat from the oidation of said coal to form steam, and producing synthesis gas and steam, monitoring the conditions in the reaction one by continually or periodically measuring the steam flow rate from the heat exchange tubes of the gasifier and calculating the rate of steam production therefrom, and comparing the calculated rate of steam production with a pre-selected value of stream production.
Claim 4
Dependent Claim
124 words
A process for the gasification of coal comprising feeding particulate coal and oxygen to a gasifier having a reaction zone operating under conditions to produce synthesis gas, the gasifier comprising a walled chamber comprising a multiplicity of heat exchange tubes composing, partly composing, or surrounding the wall or walls bounding said reaction one, water being passed through said tubes to remove heat from the oidation of said coal to form steam, and producing synthesis gas and steam, monitoring the conditions in the reaction one by continually or periodically measuring the steam flow rate from the heat exchange tubes of the gasifier and calculating the rate of steam production therefrom, and comparing the calculated rate of steam production with a pre-selected value of stream production.
Claim 5
Dependent Claim
38 words
The process of claim 2 wherein, in response to a deviation of the calculated rate of steam production from the pre-selected value of steam production rate, the rate of feed of oxygen to the reaction one is changed.
Claim 6
Dependent Claim
38 words
The process of claim 2 wherein, in response to a deviation of the calculated rate of steam production from the pre-selected value of steam production rate, the rate of feed of coal to the reaction one is changed.
Claim 7
Dependent Claim
40 words
The process of claim 2 wherein, in response to a deviation of the calculated rate of steam production from the pre-selected value of steam production rate, the rate of feed of oxygen and coal to the reaction zone is changed.
Claim 8
Dependent Claim
16 words
The process of claim 2 wherein the coal is dried before feeding to the reaction zone.
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) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |