US5839269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating a combined gas and power steam plant
Assignee: ABB Management AG
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Filing: 1997-11-26
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Granted: 1998-11-24
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Expires: 2017-11-26
Abstract
Abstract In a method of operating a power station plant, which consists of a gas-turbine group (I), a steam-generating stage (II) consisting of a waste-heat steam generator (15), and a steam cycle (III), a liquid quantity increased above 100% circulates in a heat-exchange stage (15a), operating in the low temperature range, of the waste-heat steam generator (15). The portion above 100% of this liquid quantity is diverted at the end of said heat-exchange stage (15a) and is evaporated in at least one pressure stage (26). Steam (37) arising herein is then fed to a steam turbine (17) at a suitable point. A still hot liquid quantity (36) from the pressure stage (26) is fed into a feed-water tank and deaerator (22), and steam (33) arising herein is fed to a further steam turbine (18) at a suitable point.
Inventors
- 👤 Hans Ulrich Frutschi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:17
CPC Classifications
F; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F01K23/106
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
211 words
In a method for operating a power station plant having a gas-turbine group, a waste-heat steam generator arranged downstream of the gas-turbine group, and a steam cycle arranged downstream of the waste-heat steam generator, the gas-turbine group includes at least one compressor unit, at least one combustion chamber, at least one turbine and at least one generator, the exhaust gases from the at least one turbine define a heat source for a predetermined liquid quantity flowing through the waste-heat steam generator, the predetermined liquid quantity in the waste-heat generator generates steam for operating at least one steam turbine of the steam cycle, a method improvement comprising: increasing the liquid quantity above the predetermined liquid quantity in a first heat exchange stage operating in the low temperature range of the waste-heat steam generator; diverting a portion of the liquid above the predetermined liquid quantity at the end of the first heat-exchange stage; directing the diverted portion of the liquid to at least one evaporation chamber and feeding steam generated in the evaporation chamber to a steam turbine; directing the residual diverted portion of liquid in the at least one evaporation chamber to a feedwater tank and deaerator, and feeding steam generated in the feedwater tank and deaerator to a further steam turbine.
Claim 2
Dependent Claim
211 words
In a method for operating a power station plant having a gas-turbine group, a waste-heat steam generator arranged downstream of the gas-turbine group, and a steam cycle arranged downstream of the waste-heat steam generator, the gas-turbine group includes at least one compressor unit, at least one combustion chamber, at least one turbine and at least one generator, the exhaust gases from the at least one turbine define a heat source for a predetermined liquid quantity flowing through the waste-heat steam generator, the predetermined liquid quantity in the waste-heat generator generates steam for operating at least one steam turbine of the steam cycle, a method improvement comprising: increasing the liquid quantity above the predetermined liquid quantity in a first heat exchange stage operating in the low temperature range of the waste-heat steam generator; diverting a portion of the liquid above the predetermined liquid quantity at the end of the first heat-exchange stage; directing the diverted portion of the liquid to at least one evaporation chamber and feeding steam generated in the evaporation chamber to a steam turbine; directing the residual diverted portion of liquid in the at least one evaporation chamber to a feedwater tank and deaerator, and feeding steam generated in the feedwater tank and deaerator to a further steam turbine.
Claim 3
Dependent Claim
104 words
The method as claimed in claim 1, further comprising the steps of: processing the predetermined liquid quantity in a second heat-exchange stage, directly following the first heat-exchange stage of the waste-heat steam generator and forming supercritical steam; admitting the supercritical steam to the at least one steam turbine of the steam cycle; expanding steam in the at least one steam turbine and feeding the expanded steam back into the waste-heat steam generator; processing the expanded steam in a third heat-exchange stage of the waste-heat steam generator and forming reheated steam; and admitting the reheated steam to a corresponding pressure stage of the steam turbine.
Claim 4
Dependent Claim
28 words
The method as claimed in claim 1, wherein the feed-water tank and deaerator define an evaporation stage of the steam cycle arranged downstream of the waste-heat steam generator.
Claim 5
Dependent Claim
36 words
The method as claimed in claim 1, further comprising directing the portion of liquid above the predetermined liquid quantity to a separate heat-exchange element in parallel with the first heat-exchange stage in the low temperature range.
Claim 6
Dependent Claim
36 words
The method as claimed in claim 1, further comprising directing the portion of liquid above the predetermined liquid quantity to a separate heat-exchange element in series with the first heat-exchange stage in the low temperature range.
Claim 7
Dependent Claim
61 words
The method as claimed in claim 4, wherein the portion of liquid above the predetermined liquid quantity includes a first type of liquid and the predetermined liquid quantity includes a second type of liquid different from the first type of liquid, and wherein thermal energy resulting from the heat exchange in the separate heat-exchange element is utilized in a separate machine.
Claim 8
Dependent Claim
61 words
The method as claimed in claim 5, wherein the portion of liquid above the predetermined liquid quantity includes a first type of liquid and the predetermined liquid quantity includes a second type of liquid different from the first type of liquid, and wherein thermal energy resulting from the heat exchange in the separate heat-exchange element is utilized in a separate machine.
Claim 9
Independent Claim
219 words
A method for operating a power station plant having a gas-turbine group, a waste-heat steam generator arranged downstream of the gas-turbine group, and a steam cycle arranged downstream of the waste-heat steam generator, the gas-turbine group includes at least one compressor unit, at least one combustion chamber, at least one turbine and at least one generator, the method comprising the steps of: defining a predetermined liquid quantity flowing through the waste-heat steam generator and heating the predetermined liquid quantity with the exhaust gases from the at least one turbine of the gas-turbine group, the predetermined liquid quantity in the waste-heat generator generating steam for operating at least one steam turbine of the steam cycle; increasing the liquid quantity above the predetermined liquid quantity in a first heat exchange stage operating in the low temperature range of the waste-heat steam generator; diverting a portion of the liquid above the predetermined liquid quantity at the end of the first heat-exchange stage; directing the diverted portion of the liquid to at least one evaporation chamber and feeding steam generated in the evaporation chamber to a steam turbine; directing the residual diverted portion of liquid in the at least one evaporation chamber to a feedwater tank and deaerator, and feeding steam generated in the feedwater tank and deaerator to a further steam turbine.
Claim 10
Independent Claim
219 words
A method for operating a power station plant having a gas-turbine group, a waste-heat steam generator arranged downstream of the gas-turbine group, and a steam cycle arranged downstream of the waste-heat steam generator, the gas-turbine group includes at least one compressor unit, at least one combustion chamber, at least one turbine and at least one generator, the method comprising the steps of: defining a predetermined liquid quantity flowing through the waste-heat steam generator and heating the predetermined liquid quantity with the exhaust gases from the at least one turbine of the gas-turbine group, the predetermined liquid quantity in the waste-heat generator generating steam for operating at least one steam turbine of the steam cycle; increasing the liquid quantity above the predetermined liquid quantity in a first heat exchange stage operating in the low temperature range of the waste-heat steam generator; diverting a portion of the liquid above the predetermined liquid quantity at the end of the first heat-exchange stage; directing the diverted portion of the liquid to at least one evaporation chamber and feeding steam generated in the evaporation chamber to a steam turbine; directing the residual diverted portion of liquid in the at least one evaporation chamber to a feedwater tank and deaerator, and feeding steam generated in the feedwater tank and deaerator to a further steam turbine.
Claim 11
Dependent Claim
72 words
The method as claimed in claim 8, wherein the at least one turbine of the gas-turbine group comprises a first turbine and a second turbine, and the at least one combustion chamber comprises a first combustion chamber upstream of the first turbine and a second combustion chamber between the first and second turbine, the second turbine being arranged downstream of the first turbine such that the gas-turbine group operates in sequential combustion.
Claim 12
Dependent Claim
106 words
The method as claimed in claim 8, further comprising the steps of: processing the predetermined liquid quantity in a second heat-exchange stage, directly following the first heat-exchange stage of the waste-heat steam generator and forming supercritical steam; admitting the supercritical steam to the at least one steam turbine of the steam cycle; expanding steam in the at least one steam turbine and feeding the expanded steam back into the waste-heat steam generator; processing the expanded steam in a third heat-exchange stage of the waste-heat steam generator and forming reheated steam; and admitting the reheated steam to a corresponding pressure stage of the steam turbine arranged downstream.
Claim 13
Dependent Claim
28 words
The method as claimed in claim 8, wherein the feed-water tank and deaerator define an evaporation stage of the steam cycle arranged downstream of the waste-heat steam generator.
Claim 14
Dependent Claim
36 words
The method as claimed in claim 8, further comprising directing the portion of liquid above the predetermined liquid quantity to a separate heat-exchange element in parallel with the first heat-exchange stage in the low temperature range.
Claim 15
Dependent Claim
36 words
The method as claimed in claim 8, further comprising directing the portion of liquid above the predetermined liquid quantity to a separate heat-exchange element in series with the first heat-exchange stage in the low temperature range.
Claim 16
Dependent Claim
61 words
The method as claimed in claim 12, wherein the portion of liquid above the predetermined liquid quantity includes a first type of liquid and the predetermined liquid quantity includes a second type of liquid different from the first type of liquid, and wherein thermal energy resulting from the heat exchange in the separate heat-exchange element is utilized in a separate machine.
Claim 17
Dependent Claim
61 words
The method as claimed in claim 13, wherein the portion of liquid above the predetermined liquid quantity includes a first type of liquid and the predetermined liquid quantity includes a second type of liquid different from the first type of liquid, and wherein thermal energy resulting from the heat exchange in the separate heat-exchange element is utilized in a separate machine.
References Cited (Backward Citations)
CH480535A
Cited
US4424668A
Cited
US4501233A
Cited
EP0321809B1
Cited
EP0515911A1
Cited
US5313782A
Cited
EP0582898A1
Cited
US5369950A
Cited
US5386685A
Cited
DE4321081A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-11-23 | 2002-05-25 | 2002-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-23 | 2006-05-25 | 2006-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-23 | 2010-05-25 | 2010-11-24 | $7700.00 | Window Closed / Lapsed |