US5357746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for recovering waste heat
Assignee: Siemens Energy Inc
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Filing: 1993-12-22
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Granted: 1994-10-25
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Expires: 2013-12-22
Abstract
Abstract An improved system for recovering waste heat from a combustion turbine in a combined cycle power plant of the type that includes at least one combustion turbine and at least one steam turbine includes a first heat recovery system for heating condensate in the steam turbine cycle with heat from the hot exhaust gases from the combustion-type turbine, and a second heat recovery system for heating the fuel that is used in the combustion turbine with heat from the exhaust gases. The second system permits recovery of heat energy that is not recovered by the first system, thereby improving plant efficiency.
Inventors
- 👤 Gerald A. Myers
- 👤 Peter S. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:11
CPC Classifications
F; F02; F02G; F02G5/00; F02C; F02C7/00; F02C7/22; F02C7/224; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F01K23/106; F02C6/00; F02C6/18; Y; Y02; Y02E; Y02E20/00; Y02E20/16
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
131 words
A combined cycle power plant, comprising: a combustion-type turbine having a fuel inlet and an outlet for emitting hot gases that are combustion products; a fuel line communicated with said inlet of said combustion-type turbine; a steam-type turbine having a steam inlet and a steam outlet; a condenser in communication with said steam outlet for condensing spent steam from said steam type turbine into a liquid condensate; a deaerator; a pump for supplying condensate from said condenser to said deaerator; at least one heat exchanger for heating deaerated condensate from said deaerator with said hot gases; a heat recovery device for preheating said condensate before said condensate enters said deaerator; and a fuel-condensate heat exchanger for transferring heat from said preheated condensate to fuel that is contained in said fuel line.
Claim 2
Dependent Claim
131 words
A combined cycle power plant, comprising: a combustion-type turbine having a fuel inlet and an outlet for emitting hot gases that are combustion products; a fuel line communicated with said inlet of said combustion-type turbine; a steam-type turbine having a steam inlet and a steam outlet; a condenser in communication with said steam outlet for condensing spent steam from said steam type turbine into a liquid condensate; a deaerator; a pump for supplying condensate from said condenser to said deaerator; at least one heat exchanger for heating deaerated condensate from said deaerator with said hot gases; a heat recovery device for preheating said condensate before said condensate enters said deaerator; and a fuel-condensate heat exchanger for transferring heat from said preheated condensate to fuel that is contained in said fuel line.
Claim 3
Dependent Claim
22 words
A combined cycle power plant according to claim 1, wherein said combustion-type turbine is constructed and arranged to operate using fuel gas.
Claim 4
Dependent Claim
32 words
A combined cycle power plant according to claim 1, wherein said at least one heat exchanger for heating deaerated condensate from said deaerator with said hot gases comprises three sequential heat exchangers.
Claim 5
Dependent Claim
37 words
A combined cycle power plant according to claim 1, wherein said heat exchanger comprises a heat recovery steam generator that is constructed and arranged to generate steam from said deaerated condensate with heat from said hot gases.
Claim 6
Dependent Claim
19 words
A combined cycle power plant according to claim 1, wherein said heat recovery device comprises a convective tube bank.
Claim 7
Dependent Claim
51 words
A combined cycle power plant according to claim 1, wherein said heat recovery device is positioned downstream from said at least one heat exchanger in a flow path of the hot gases from said combustion-type turbine, whereby it is recovering heat that is not recovered by said first heat recovery means.
Claim 8
Dependent Claim
25 words
A combined cycle power plant according to claim 1, further comprising a continuous condensate flow circuit comprising said pump means and said heat recovery device.
Claim 9
Dependent Claim
149 words
An improved system for recovering waste heat from a combustion turbine in a combined cycle power plant of the type that includes at least one combustion turbine having a fuel inlet and an outlet for emitting hot gases that are exhaust products; at least one steam turbine having a steam inlet and a steam outlet; and a condenser for condensing spent steam from said steam outlet into condensate, comprising: a fuel line that is adapted to be communicated with the inlet of the combustion turbine; a deaerator; a pump for supplying condensate from said condenser to said deaerator; at least one heat exchanger for heating deaerated condensate from said deaerator with said hot gases; a heat recovery device for preheating said condensate before said condensate enters said deaerator; and a fuel-condensate heat exchanger for transferring heat from said preheated condensate to fuel that is contained in said fuel line.
Claim 10
Dependent Claim
149 words
An improved system for recovering waste heat from a combustion turbine in a combined cycle power plant of the type that includes at least one combustion turbine having a fuel inlet and an outlet for emitting hot gases that are exhaust products; at least one steam turbine having a steam inlet and a steam outlet; and a condenser for condensing spent steam from said steam outlet into condensate, comprising: a fuel line that is adapted to be communicated with the inlet of the combustion turbine; a deaerator; a pump for supplying condensate from said condenser to said deaerator; at least one heat exchanger for heating deaerated condensate from said deaerator with said hot gases; a heat recovery device for preheating said condensate before said condensate enters said deaerator; and a fuel-condensate heat exchanger for transferring heat from said preheated condensate to fuel that is contained in said fuel line.
Claim 11
Dependent Claim
29 words
A system according to claim 8, wherein said at least one heat exchanger for heating deaerated condensate from said deaerator with said hot gases comprises three sequential heat exchangers.
Claim 12
Dependent Claim
37 words
A system according to claim 8, wherein said at least one heat exchanger comprises a heat recovery steam generator that is constructed and arranged to generate steam from said deaerated condensate with heat from said hot gases.
Claim 13
Dependent Claim
16 words
A system according to claim 8, wherein said heat recovery device comprises a convective tube bank.
Claim 14
Dependent Claim
48 words
A system according to claim 8, wherein said heat recovery device is positioned downstream from said at least one heat exchanger in a flow path of the hot gases from said combustion-type turbine, whereby it is recovering heat that is not recovered by said first heat recovery means.
Claim 15
Dependent Claim
22 words
A system according to claim 8, further comprising a continuous condensate flow circuit comprising said pump means and said heat recovery device.
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) | 1997-10-24 | 1998-04-25 | 1998-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-24 | 2002-04-25 | 2002-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-24 | 2006-04-25 | 2006-10-25 | $7700.00 | Window Closed / Lapsed |