US5525053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating a combined cycle power plant
Assignee: Wartsila Diesel Inc
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Filing: 1994-12-01
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Granted: 1996-06-11
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Expires: 2014-12-01
Abstract
Abstract A method of using internal combustion engine exhaust in a combined cycle power plant is disclosed, wherein the quality and distribution of exhaust to the boiler space of a steam generated electric power plant is controlled to achieve greater system efficiencies. Outside air is blended only with that portion of the exhaust that passes through the burner ports as secondary or higher level combustion gas. The remainder of the exhaust is provided to the boiler space by a route other than through the burner. The highest overall system efficiencies are achieved where the amount of outside air blended with the portion of exhaust that passes through the burner is such that the blend contains about the minimum amount of oxygen required for complete and stable combustion of the selected fuel, where a substantial percentage of the total exhaust is routed to the boiler space by a route other than through the burner, and where the amount of fuel is sufficient to achieve a desired boiler entering temperature upon its combustion.
Inventors
- 👤 F. Mack Shelor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:08
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/02; F22B1/18; F22B1/1861; F22B1/1807; F23; F23C; F23C6/00; F23C6/04; F23C6/045; F23C7/00; F23C7/02; F23C7/06; F23L; F23L15/00; F23L7/00; F23C2201/00; F23C2201/20; F23J; F23J2219/00; F23J2219/10; F23L2900/00; F23L2900/07001; F23L2900/07002; Y; Y02; Y02E; Y02E20/00; Y02E20/12; Y02E20/16; Y02E20/32; Y02E20/34
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
151 words
A method of operating a combined cycle power plant comprising an internal combustion engine, a burner, and a boiler space, the method comprising: routing a first portion of exhaust from the internal combustion engine to the boiler space by a route other than through the burner; routing fuel through a primary burner outlet in an amount sufficient to achieve a desired average boiler entering temperature upon its combustion; providing a second portion of exhaust from the internal combustion engine for eventual routing through at least one outlet of the burner other than the primary burner outlet; blending an amount of air with the second portion of exhaust such that the blend of air and exhaust contains about the minimum level of oxygen appropriate for complete and stable combustion of the fuel; routing the blend of air and exhaust through the at least one outlet of the burner; and combusting the fuel.
Claim 2
Independent Claim
151 words
A method of operating a combined cycle power plant comprising an internal combustion engine, a burner, and a boiler space, the method comprising: routing a first portion of exhaust from the internal combustion engine to the boiler space by a route other than through the burner; routing fuel through a primary burner outlet in an amount sufficient to achieve a desired average boiler entering temperature upon its combustion; providing a second portion of exhaust from the internal combustion engine for eventual routing through at least one outlet of the burner other than the primary burner outlet; blending an amount of air with the second portion of exhaust such that the blend of air and exhaust contains about the minimum level of oxygen appropriate for complete and stable combustion of the fuel; routing the blend of air and exhaust through the at least one outlet of the burner; and combusting the fuel.
Claim 3
Dependent Claim
25 words
The method of claim 1 where the first portion of exhaust is at least about 60 percent of all exhaust routed to the boiler space.
Claim 4
Dependent Claim
25 words
The method of claim 2 where the first portion of exhaust is up to about 80 percent of all exhaust routed to the boiler space.
Claim 5
Dependent Claim
28 words
The method of claim 1 where the first portion of exhaust is at least about 54 percent of the total mass of all gas entering the boiler space.
Claim 6
Dependent Claim
28 words
The method of claim 4 where the first portion of exhaust is up to about 76 percent of the total mass of all gas entering the boiler space.
Claim 7
Dependent Claim
14 words
The method of claim 5 where the internal combustion engine is a diesel engine.
Claim 8
Dependent Claim
20 words
The method of claim 6 where the air is heated prior to blending it with the second portion of exhaust.
Claim 9
Dependent Claim
19 words
The method of claim 7 where the fuel is blended with an amount of carrier air prior to combustion.
Claim 10
Dependent Claim
18 words
The method of claim 8 where a reducing atmosphere is maintained in a portion of a combustion zone.
Claim 11
Dependent Claim
13 words
The method of claim 8 where combustion of the fuel proceeds in stages.
Claim 12
Dependent Claim
20 words
The method of claim 8 where no exhaust from the internal combustion engine is routed through the primary burner outlet.
Claim 13
Dependent Claim
20 words
The method of claim 5 where the first portion of exhaust enters the boiler space downstream of a combustion zone.
Claim 14
Independent Claim
159 words
A method of operating a combined cycle power plant comprising an internal combustion engine, a burner, and a boiler space, the method comprising: routing a first portion of exhaust from the internal combustion engine to the boiler space by a route other than through the burner; routing fuel through a primary burner outlet; providing a second portion of exhaust from the internal combustion engine for eventual routing through at least one outlet of the burner other than the primary burner outlet; blending an amount of air with the second portion of exhaust such that the blend of air and exhaust contains about the minimum level of oxygen appropriate for complete and stable combustion of the fuel; routing the blend of air and exhaust through the at least one outlet of the burner; and combusting the fuel, where the first portion of exhaust is at least about 54 percent of the total mass of all gas entering the boiler space.
Claim 15
Independent Claim
159 words
A method of operating a combined cycle power plant comprising an internal combustion engine, a burner, and a boiler space, the method comprising: routing a first portion of exhaust from the internal combustion engine to the boiler space by a route other than through the burner; routing fuel through a primary burner outlet; providing a second portion of exhaust from the internal combustion engine for eventual routing through at least one outlet of the burner other than the primary burner outlet; blending an amount of air with the second portion of exhaust such that the blend of air and exhaust contains about the minimum level of oxygen appropriate for complete and stable combustion of the fuel; routing the blend of air and exhaust through the at least one outlet of the burner; and combusting the fuel, where the first portion of exhaust is at least about 54 percent of the total mass of all gas entering the boiler space.
Claim 16
Dependent Claim
28 words
The method of claim 13 where the first portion of exhaust is up to about 76 percent of the total mass of all gas entering the boiler space.
Claim 17
Dependent Claim
25 words
The method of claim 14 where the first portion of exhaust is at least about 60 percent of all exhaust routed to the boiler space.
Claim 18
Dependent Claim
25 words
The method of claim 15 where the first portion of exhaust is up to about 80 percent of all exhaust routed to the boiler space.
Claim 19
Dependent Claim
27 words
The method of claim 13 where the fuel is about the minimum amount of fuel necessary to achieve a desired average boiler entering temperature upon its combustion.
Claim 20
Independent Claim
142 words
A method of operating a combined cycle power plant comprising an internal combustion engine, a burner, and a boiler space, the method comprising: routing a first portion of exhaust from the internal combustion engine to the boiler space by a route other than through the burner; routing fuel through a primary burner outlet in an amount sufficient to achieve a desired average boiler entering temperature upon its combustion; providing a second portion of exhaust from the internal combustion engine for eventual use as secondary or higher level combustion gas; blending an amount of air with the second portion of exhaust such that the blend of air and exhaust contains about the minimum level of oxygen appropriate for complete and stable combustion of the fuel; providing the blend of air and exhaust as secondary or higher level combustion gas; and combusting the fuel.
Claim 21
Independent Claim
142 words
A method of operating a combined cycle power plant comprising an internal combustion engine, a burner, and a boiler space, the method comprising: routing a first portion of exhaust from the internal combustion engine to the boiler space by a route other than through the burner; routing fuel through a primary burner outlet in an amount sufficient to achieve a desired average boiler entering temperature upon its combustion; providing a second portion of exhaust from the internal combustion engine for eventual use as secondary or higher level combustion gas; blending an amount of air with the second portion of exhaust such that the blend of air and exhaust contains about the minimum level of oxygen appropriate for complete and stable combustion of the fuel; providing the blend of air and exhaust as secondary or higher level combustion gas; and combusting the fuel.
Claim 22
Dependent Claim
25 words
The method of claim 18 where the first portion of exhaust is at least about 60 percent of all exhaust routed to the boiler space.
Claim 23
Dependent Claim
25 words
The method of claim 19 where the first portion of exhaust is up to about 80 percent of all exhaust routed to the boiler space.
Claim 24
Dependent Claim
28 words
The method of claim 18 where the first portion of exhaust is at least about 54 percent of the total mass of all gas entering the boiler space.
Claim 25
Dependent Claim
27 words
The method of claim 21 where the first portion of exhaust is up to about 76 percent of the total mass of gas entering the boiler space.
Claim 26
Dependent Claim
20 words
The method of claim 22 where the blend of air and exhaust is provided as secondary and tertiary combustion gas.
Claim 27
Dependent Claim
21 words
The method of claim 23 where the amounts of oxygen in the secondary and tertiary combustion gases are not the same.
References Cited (Backward Citations)
US3808805A
Cited
US3884194A
Cited
US3788796A
Cited
US3904349A
Cited
US4496306A
Cited
US4403941A
Cited
US4403941B1
Cited
US4380202A
Cited
US4412810A
Cited
US4501233A
Cited
US4748919A
Cited
US4790743A
Cited
US4545307A
Cited
US4572110A
Cited
US4838185A
Cited
US4654001A
Cited
US4907962A
Cited
US4739713A
Cited
US4706612A
Cited
US4807541A
Cited
US4799461A
Cited
US4881474A
Cited
US5151256A
Cited
US4836772A
Cited
US4915619A
Cited
US5022849A
Cited
US5067419A
Cited
US5090339A
Cited
US4928635A
Cited
US5133298A
Cited
US5215455A
Cited
US5231937A
Cited
US5263426A
Cited
US5129818A
Cited
US5092761A
Cited
US5190451A
Cited
US5236354A
Cited
US5199357A
Cited
US5129333A
Cited
US5113771A
Cited
US5199355A
Cited
US5224334A
Cited
US5299930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-06-11 | 1999-12-11 | 2000-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-11 | 2003-12-11 | 2004-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-11 | 2007-12-11 | 2008-06-11 | $7700.00 | Window Closed / Lapsed |