US3766734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual fuel control system for a gas turbine
Assignee: General Electric Co
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Filing: 1972-03-01
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Granted: 1973-10-23
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Expires: 1992-03-01
Abstract
Abstract A fuel control system for a gas turbine for simultaneously burning a liquid fuel and a gas fuel according to the availability of and in preference for the gas fuel. In the embodiment shown, the gas turbine serves as a marine propulsion system for a tanker carrying liquid natural gas as a cargo with gas ''''boil-off'''' serving as a gaseous fuel source of variable availability. In addition to continuously modulating the fuel ratio based on gas flow rate availability, the system also allows operation on dual fuel at a selected ratio between fuels or automatic transfer to single fuel mode when either fuel falls below a minimum value.
Inventors
- 👤 R Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:04
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26; F02C9/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
153 words
A dual fuel control system for a gas turbine adapted to burn first and second fuels simultaneously, the first fuel being preferred and subject to varying availability, comprising: first means providing a total fuel command signal representing total fuel flow rate requirements of the gas turbine, second means providing a signal representing flow rate availability of said first fuel, third means connected to provide a first fuel command signal which is the lower of the signals from said first and second means, and fourth means connected to provide a second fuel command signal which is the difference between the signals from the first and second means, whereby said third means sets flow of the first fuel when power requirements exceed its availability while the fourth means provides the balance of fuel needed, and whereby the first means controls the flow of first fuel when total fuel requirements are less than first fuel availability.
Claim 2
Dependent Claim
153 words
A dual fuel control system for a gas turbine adapted to burn first and second fuels simultaneously, the first fuel being preferred and subject to varying availability, comprising: first means providing a total fuel command signal representing total fuel flow rate requirements of the gas turbine, second means providing a signal representing flow rate availability of said first fuel, third means connected to provide a first fuel command signal which is the lower of the signals from said first and second means, and fourth means connected to provide a second fuel command signal which is the difference between the signals from the first and second means, whereby said third means sets flow of the first fuel when power requirements exceed its availability while the fourth means provides the balance of fuel needed, and whereby the first means controls the flow of first fuel when total fuel requirements are less than first fuel availability.
Claim 3
Dependent Claim
52 words
The combination according to claim 1, wherein said first and second fuels are gas and liquid, respectively, and wherein said second means is a pressure controller for the first fuel, together with additional means to hold the pressure constant by varying thE flow of the first fuel through a gas control valve.
Claim 4
Dependent Claim
42 words
The combination according to claim 1, and further including means to selectively cut off either said first fuel command signal or said second fuel command signal whereby the gas turbine will operate on fuel only as set by the remaining command signal.
Claim 5
Dependent Claim
55 words
The combination according to claim 1, including means for substituting a large signal for that from said second means so that the third means will select the total fuel command signal, and further including fifth means connectable to force the first fuel command signal to be a selected fraction of said total fuel command signal.
Claim 6
Dependent Claim
26 words
The combination according to claim 1, including means to block the first fuel command signal when the first fuel flow is below a selectable minimum setpoint.
Claim 7
Dependent Claim
27 words
The combination according to claim 1, further including selector means arranged to prevent the fall of the second fuel command signal below a selectable minimum flow setpoint.
Claim 8
Dependent Claim
175 words
A dual fuel control system for a marine gas turbine adapted to burn simultaneously a liquid fuel and also a gaseous fuel from the marine cargo which is subject to varying availability, said system comprising: a gas flow control valve controlling the flow of gas to the gas turbine in response to a gas fuel command signal, liuqid fuel control means controlling the flow of liquid fuel to the gas turbine in response to a liquid fuel command signal, means providing a total fuel command signal representing the total fuel requirements of the gas turbine, a pressure controller providing a signal for holding the gas pressure ahead of said gas flow control valve constant and representing flow rate availability of the gas, a low value selector for providing a gas fuel command signal which is the lower of either the total fuel command signal or the signal from said pressure controller, and a summer connected to subtract said gas fuel command signal from the total fuel command signal to provide said liquid fuel command signal.
Claim 9
Dependent Claim
175 words
A dual fuel control system for a marine gas turbine adapted to burn simultaneously a liquid fuel and also a gaseous fuel from the marine cargo which is subject to varying availability, said system comprising: a gas flow control valve controlling the flow of gas to the gas turbine in response to a gas fuel command signal, liuqid fuel control means controlling the flow of liquid fuel to the gas turbine in response to a liquid fuel command signal, means providing a total fuel command signal representing the total fuel requirements of the gas turbine, a pressure controller providing a signal for holding the gas pressure ahead of said gas flow control valve constant and representing flow rate availability of the gas, a low value selector for providing a gas fuel command signal which is the lower of either the total fuel command signal or the signal from said pressure controller, and a summer connected to subtract said gas fuel command signal from the total fuel command signal to provide said liquid fuel command signal.
Claim 10
Dependent Claim
41 words
The combination according to claim 7, further including transfer means to selectively reduce either the gas fuel command signal or the liquid fuel command signal in order to change the proportion between gas and liquid fuels furnished to the gas turbine.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |