US4095934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste gas recovery
Assignee: Mobil Oil AS
•
Filing: 1977-03-24
•
Granted: 1978-06-20
•
Expires: 1997-03-24
Abstract
Abstract An important fuel saving is achieved by recovering fuel gas from the pressure relief system of a processing complex such as an oil refinery without impairing safety features.
Inventors
- 👤 Larry F. Jensen
- 👤 Frank D. Hartzell
- 👤 William S. Hutchison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
F; F23; F23K; F23K5/00; F23K5/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
218 words
In a complex of process units for conversion of combustible feed materials to desired products having a common fuel gas system for supply of fuel gas to individual process units, a common relief system for collection of combustible gases at pressure relief devices associated with said process units, an incinerator, a pressure relief header connected to said incinerator for discharge into said incinerator, and means to supply said combustible gas so collected to said header; the improvement to permit recovering fuel value of the said collected combustible gases to the maximum extent consistent with safety of the said complex which comprises: (1) compressor means adapted to compress said collected combustible gases to the pressure of said fuel gas system, (2) means to conduct gases discharged from said compressor means into said fuel gas system, (3) a gas supply conduit communicating with said header and with intake of said compressor means, (4) a control valve in said conduit adapted to close the same, (5) means to generate a signal representative of pressure in said header, (6) means to generate a signal representative of vacuum in said conduit between said valve and the intake of said compressor means, (7) means responsive to said signals adapted to close said valve when the lesser of said signals is below a predetermined minimum.
Claim 2
Dependent Claim
218 words
In a complex of process units for conversion of combustible feed materials to desired products having a common fuel gas system for supply of fuel gas to individual process units, a common relief system for collection of combustible gases at pressure relief devices associated with said process units, an incinerator, a pressure relief header connected to said incinerator for discharge into said incinerator, and means to supply said combustible gas so collected to said header; the improvement to permit recovering fuel value of the said collected combustible gases to the maximum extent consistent with safety of the said complex which comprises: (1) compressor means adapted to compress said collected combustible gases to the pressure of said fuel gas system, (2) means to conduct gases discharged from said compressor means into said fuel gas system, (3) a gas supply conduit communicating with said header and with intake of said compressor means, (4) a control valve in said conduit adapted to close the same, (5) means to generate a signal representative of pressure in said header, (6) means to generate a signal representative of vacuum in said conduit between said valve and the intake of said compressor means, (7) means responsive to said signals adapted to close said valve when the lesser of said signals is below a predetermined minimum.
Claim 3
Dependent Claim
26 words
A complex according to claim 1 including means to treat the discharge of said compressor means to remove therefrom components undesirable in said fuel gas system.
Claim 4
Dependent Claim
91 words
A complex according to claim 1 including means for maintaining pressure in said header above a predetermined minimum which means comprise a pressuring conduit for supply of fuel gas to said header, a normally closed valve in said pressuring conduit, a valve actuator operatively connected to open said valve, a sensor to detect pressure in said header and a signal system responsove to said sensor and adapted to activate said valve actuator to open said valve upon detection by said sensor of a pressure in said header below said predetermined minimum.
References Cited (Backward Citations)
US3915620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |