US4456459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement and method for the production of liquid natural gas
Assignee: Mobil Oil AS
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Filing: 1983-01-07
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Granted: 1984-06-26
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Expires: 2003-01-07
Abstract
Abstract An arrangement and a method for the increase in the production of liquid natural gas and the conservation of energy and reduction of flash gas in a liquid natural gas manufacturing installation and, more particularly, the reduction in the quantity of formed flash gas through the novel utilization of a hydraulic expander in the installation for extracting work from the flow of liquid natural gas prior to flashing thereof.
Inventors
- 👤 Virgil L. Brundige, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:15
CPC Classifications
F; F25; F25J; F25J1/00; F25J1/003; F25J1/0032; F25J1/0042; F25J1/0002; F25J1/0022; F25J1/02; F25J1/0243; F25J1/0244; F25J1/0245; F25J1/0248; F25J2220/00; F25J2220/60; F25J2220/62; F25J2240/00; F25J2240/40
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
169 words
In a liquid natural gas manufacturing facility, an arrangement for improving liquid natural gas production, reducing flash gas production and conserving energy, comprising: means operating to reduce the pressure of a super-cooled stream of liquid natural gas feed from a main exchanger of the liquid natural gas manufacturing facility, to extract work from both a liquid phase and a vapor phase formed during the reduction in pressure, and to separate the liquid and vapor phases into streams of liquid natural gas and flash gas; said means consisting of a hydraulic expander designed to extract work from both the liquid phase and vapor phase formed during the reduction in pressure, a low pressure flash means for separating the liquid and vapor phases, and a first flow conduit for feeding the super-cooled stream of liquid natural gas from the main exchanger to the hydraulic expander and for feeding the liquid and vapor phases exiting from an outlet of the hydraulic expander directly to an inlet of the low pressure flash means.
Claim 2
Dependent Claim
169 words
In a liquid natural gas manufacturing facility, an arrangement for improving liquid natural gas production, reducing flash gas production and conserving energy, comprising: means operating to reduce the pressure of a super-cooled stream of liquid natural gas feed from a main exchanger of the liquid natural gas manufacturing facility, to extract work from both a liquid phase and a vapor phase formed during the reduction in pressure, and to separate the liquid and vapor phases into streams of liquid natural gas and flash gas; said means consisting of a hydraulic expander designed to extract work from both the liquid phase and vapor phase formed during the reduction in pressure, a low pressure flash means for separating the liquid and vapor phases, and a first flow conduit for feeding the super-cooled stream of liquid natural gas from the main exchanger to the hydraulic expander and for feeding the liquid and vapor phases exiting from an outlet of the hydraulic expander directly to an inlet of the low pressure flash means.
Claim 3
Dependent Claim
132 words
An arrangement as claimed in claim 1, further comprising: means to enable the liquid natural gas manufacturing facility to be continuously operated without interruption when the hydraulic expander is out of service; said means consisting of a second flow conduit connecting into said first flow conduit upstream and downstream of said hydraulic expander to form a parallel bypass flowpath for the liquid natural gas stream between the main exchanger and the low pressure flash means, and a Joule-Thomson valve interposed in said second flow conduit, said Joule-Thomson valve being selectively closable to preclude flow of liquid natural gas when the hydraulic expander is in service and openable to allow flow of liquid natural gas and effect a reduction in the pressure of the gas when the hydraulic expander is out of service.
Claim 4
Dependent Claim
13 words
An arrangement as claimed in claim 1, said hydraulic expander comprising a turboexpander.
Claim 5
Dependent Claim
30 words
An arrangement as claimed in claim 1, said hydraulic expander being connected to means for converting the work extracted from the liquid and vapor phases into mechanical or electrical energy.
Claim 6
Dependent Claim
25 words
An arrangement as claimed in claim 1, said stream of flash gas formed in the flash means being employable as fuel in said manufacturing facility.
Claim 7
Dependent Claim
148 words
In a method for producing liquified natural gas, a method for improving liquid natural gas production, reducing flash gas production and conserving energy, comprising: feeding a stream of super-cooled and pressurized liquid natural gas from a main exchanger of a liquid natural gas manufacturing facility to a hydraulic expander means; conducting the stream through the hydraulic expander to reduce the pressure of the stream and to further cool the stream, said stream forming gas and vapor phases during the pressure reduction; extracting work from both the liquid and vapor phases during the pressure reduction by means of said hydraulic expander; feeding the liquid and vapor phases from an outlet of the hydraulic expander directly to a low-pressure flash means without further treatment; and flashing the liquid and vapor phases in the low pressure flash means in order to form separate streams of liquid natural gas and flash gas.
Claim 8
Dependent Claim
148 words
In a method for producing liquified natural gas, a method for improving liquid natural gas production, reducing flash gas production and conserving energy, comprising: feeding a stream of super-cooled and pressurized liquid natural gas from a main exchanger of a liquid natural gas manufacturing facility to a hydraulic expander means; conducting the stream through the hydraulic expander to reduce the pressure of the stream and to further cool the stream, said stream forming gas and vapor phases during the pressure reduction; extracting work from both the liquid and vapor phases during the pressure reduction by means of said hydraulic expander; feeding the liquid and vapor phases from an outlet of the hydraulic expander directly to a low-pressure flash means without further treatment; and flashing the liquid and vapor phases in the low pressure flash means in order to form separate streams of liquid natural gas and flash gas.
Claim 9
Dependent Claim
111 words
A method as claimed in claim 6, further comprising providing a parallel flow path for the liquid natural gas stream between the main exchanger and the flash means bypassing said hydraulic expander, and a Joule-Thomson valve interposed in said second flow path, said Joule-Thomson valve being selectively closable to preclude flow of liquid natural gas when the hydraulic expander is in service and openable to allow flow of liquid natural gas and effect a reduction in the pressure of the gas when the hydraulic expander is out of service, thereby enabling the liquid natural gas manufacturing facility to be continuously operated without interruption when the hydraulic expander is out of service.
Claim 10
Dependent Claim
13 words
A method as claimed in claim 6, said hydraulic expander comprising a turboexpander.
Claim 11
Dependent Claim
31 words
A method as claimed in claim 6, further comprising connecting said hydraulic expander to means for converting the work extracted from the liquid and vapor phases into mechanical or electrical energy.
Claim 12
Dependent Claim
28 words
A method as claimed in claim 6, further comprising employing the stream of flash gas formed in the low pressure flash means as fuel in the manufacturing facility.
References Cited (Backward Citations)
US3203191A
Cited
US3182461A
Cited
US3292380A
Cited
US3383873A
Cited
US3616652A
Cited
US3416324A
Cited
US3702541A
Cited
US3735600A
Cited
US3729944A
Cited
US3864926A
Cited
US3724226A
Cited
US4061481A
Cited
US4061481B1
Cited
US4179897A
Cited
US4065278A
Cited
US4155729A
Cited
US4334902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |