US4995915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning gas turbine fuel nozzles
Assignee: Dow Chemical Co
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Filing: 1988-07-15
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Granted: 1991-02-26
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Expires: 2008-07-15
Abstract
Abstract An on-line system for cleaning dirty gas firing nozzles of an operating industrial gas turbine including injecting a suitable cleaning chemical at a specified rate into the gas fuel line just ahead of where the line enters the header supplying the nozzles through an injector quill equipped with a metering pump and check valves and tied into a chemical cleaner supply.
Inventors
- 👤 Charles A. Sewell
- 👤 Robert D. Toles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
F; F02; F02C; F02C3/00; F02C3/20; F02C3/22; F01; F01D; F01D25/00; F01D25/002; F02C3/30; F23; F23D; F23D14/00; F23D14/46; F23D14/48; F23D14/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
A process for on-line cleaning of gas turbine fuel nozzles comprising injecting a sufficient amount of a fluid cleaning medium into a fuel system of an operating gas turbine at a rate sufficient to reduce deposits on the gas turbine fuel nozzles.
Claim 2
Dependent Claim
42 words
A process for on-line cleaning of gas turbine fuel nozzles comprising injecting a sufficient amount of a fluid cleaning medium into a fuel system of an operating gas turbine at a rate sufficient to reduce deposits on the gas turbine fuel nozzles.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the rate is up to about 20 gallons per 1000 KSCF per hour of fuel.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the fluid cleaning medium is a liquid.
Claim 5
Dependent Claim
12 words
The process of claim 3 wherein the liquid is a combustible liquid.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the injection is intermittently carried out.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein the amount of fluid cleaning medium is increased incrementally.
Claim 8
Dependent Claim
52 words
In the operation of a gas turbine including feeding a gaseous fuel to at least one gas nozzle the improvement comprising injecting a sufficient amount of a fluid cleaning medium into the gaseous fuel of the operating gas turbine at a rate sufficient to reduce deposits on the gas turbine fuel nozzles.
Claim 9
Dependent Claim
52 words
In the operation of a gas turbine including feeding a gaseous fuel to at least one gas nozzle the improvement comprising injecting a sufficient amount of a fluid cleaning medium into the gaseous fuel of the operating gas turbine at a rate sufficient to reduce deposits on the gas turbine fuel nozzles.
References Cited (Backward Citations)
US3630212A
Cited
US4508577A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |