US3756023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat recovery steam generator employing means for preventing economizer steaming
Assignee: Westinghouse Electric Corp
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Filing: 1971-12-01
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Granted: 1973-09-04
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Expires: 1991-12-01
Abstract
Abstract A system for preventing the formation of steam in an economizer coil disposed within a heat recovery steam generator used in a combined gas turbine and steam turbine power plant. This is accomplished by recycling a portion of the water at the output of the economizer back into the condensate conduit feeding the steam generator such that a constant water flow will be maintained through the economizer under all operating conditions, preventing a more or less stagnant water condition in the economizer and insuring against the formation of steam therein. The recirculated water, prior to entering the condensate conduit, is preferably passed through a heat exchanger where the heat of the water from the economizer is transferred to the incoming condensate to prevent flashing as the water from the economizer enters the condensate conduit through a valve.
Inventors
- 👤 P Berman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:53
CPC Classifications
F; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F01K23/106; F01K23/108
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
249 words
In a steam generator for a steam turbine of the type in which steam from a high pressure boiler in the generator is fed into the turbine to drive it while condensate from a condenser connected to the turbine flows through a condensate return conduit to a low pressure boiler in the generator and is then pumped through an economizer to said high pressure boiler through a level control valve for the high pressure boiler; the combination of means for preventing steaming in said economizer regardless of the rate at which steam is delivered to said turbine comprising: a boiler feed pump interposed between said low pressure boiler and said economizer for pumping heated waer through the economizer and thence to said high pressure boiler through said level control valve, means for driving said boiler feed pump to maintain an essentially constant flow rate through the economizer regardless of the condition of said level control valve, conduit means connecting the output of said economizer back to said condensate return conduit, a pressur regulating valve in said conduit connecting means for permitting the escape of water which does not pass through said level control valve back into said condensate conduit, and a heat exchanger for transferring heat from water in said conduit means to condensate in said condensate return conduit, said heat exchanger being located at a point on said condensate return conduit ahead of the point at which said conduit connecting means is connected to the condensate return conduit.
Claim 2
Dependent Claim
249 words
In a steam generator for a steam turbine of the type in which steam from a high pressure boiler in the generator is fed into the turbine to drive it while condensate from a condenser connected to the turbine flows through a condensate return conduit to a low pressure boiler in the generator and is then pumped through an economizer to said high pressure boiler through a level control valve for the high pressure boiler; the combination of means for preventing steaming in said economizer regardless of the rate at which steam is delivered to said turbine comprising: a boiler feed pump interposed between said low pressure boiler and said economizer for pumping heated waer through the economizer and thence to said high pressure boiler through said level control valve, means for driving said boiler feed pump to maintain an essentially constant flow rate through the economizer regardless of the condition of said level control valve, conduit means connecting the output of said economizer back to said condensate return conduit, a pressur regulating valve in said conduit connecting means for permitting the escape of water which does not pass through said level control valve back into said condensate conduit, and a heat exchanger for transferring heat from water in said conduit means to condensate in said condensate return conduit, said heat exchanger being located at a point on said condensate return conduit ahead of the point at which said conduit connecting means is connected to the condensate return conduit.
Claim 3
Dependent Claim
34 words
The combination of claim 1 wherein said pressure regulating valve is disposed in the conduit connecting means between said heat exchanger and the connection of the conduit connecting means to said condensate return conduit.
Claim 4
Dependent Claim
19 words
The combination of claim 1 including a deaerator interposed between the condensate return conduit and said low pressure boiler.
Claim 5
Dependent Claim
38 words
The combination of claim 1 wherein the steam generator comprises a duct through which the gaseous products of combustion from a gas turbine pass, and including additional supplementary fired fuel burners in said duct for supplying additional heat.
Claim 6
Dependent Claim
205 words
In a steam generator having a boiler for producing motive steam for a steam turbine in which the motive steam drives the turbine and is condensed in a condenser connected to the turbine and the condensate returns to the steam generator via a condensate return conduit and is then passed through an economizeR and then to said boiler through a level control valve which controls the level of the liquid maintained in said boiler; the combination of means for preventing steaming in said economizer regardless of the rate at which motive steam is delivered to said turbine, said means for preventing steaming comprising a boiler feed pump interposed between said condensate return conduit and said economizer, means for driving said boiler feed pump to maintain essentially a constant flow through the economizer regardless of the position of said level control valve, conduit means connecting the output of said economizer to said condensate return conduit, pressure regulating means disposed in said conduit collecting means for permitting the escape of water which does not pass through said level control valve back into said condensate return conduit, and a heat exchanger for transferring heat from liquid in the conduit connecting means to condensate in the condensate return conduit.
Claim 7
Dependent Claim
205 words
In a steam generator having a boiler for producing motive steam for a steam turbine in which the motive steam drives the turbine and is condensed in a condenser connected to the turbine and the condensate returns to the steam generator via a condensate return conduit and is then passed through an economizeR and then to said boiler through a level control valve which controls the level of the liquid maintained in said boiler; the combination of means for preventing steaming in said economizer regardless of the rate at which motive steam is delivered to said turbine, said means for preventing steaming comprising a boiler feed pump interposed between said condensate return conduit and said economizer, means for driving said boiler feed pump to maintain essentially a constant flow through the economizer regardless of the position of said level control valve, conduit means connecting the output of said economizer to said condensate return conduit, pressure regulating means disposed in said conduit collecting means for permitting the escape of water which does not pass through said level control valve back into said condensate return conduit, and a heat exchanger for transferring heat from liquid in the conduit connecting means to condensate in the condensate return conduit.
Claim 8
Dependent Claim
26 words
The combination of claim 5 wherein the pressure regulating means is disposed in the conduit connecting means between the heat exchanger and the condensate return conduit.
Claim 9
Dependent Claim
25 words
The combination of claim 6 including a deaerating heater disposed in the condensate return conduit down stream of the connection with the conduit connecting means.
Claim 10
Dependent Claim
45 words
The combination of claim 5, wherein the steam generator comprises a duct through which the gaseous products of combustion from a gas turbine pass, and supplemental fuel burners disposed in said duct for supplying additional heat to produce steam of the desired pressure and temperature.
Claim 11
Dependent Claim
23 words
The combination as set forth in claim 5 including a deaerating heater disposed in the condensate return conduit and forming a protion thereof.
References Cited (Backward Citations)
US2199214A
Cited
US3675423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |