Patent US3913330A successfully refreshed from Google Patents.
US3913330A
Expired / Lapsed
US
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Vapor generator heat recovery system
Assignee: Combustion Engineering Inc
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Filing: 1974-06-17
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Granted: 1975-10-21
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Expires: 1994-06-17
Abstract
Abstract A vapor generator heat recovery system is described for use in high efficiency power plants, especially of the marine type, having multiple stages of high pressure regenerative feedwater heating. The vapor generator is provided with a sectionalized economizer in which one section is disposed upstream of a tubular air heater in the feedwater flow sense whereby air preheating is accomplished by heat passed from the feedwater heated in the section. The system arrangement is such that total feedwater flow is utilized in the air heater thereby reducing the amount of heat transfer surface required therein. Controls are provided to ensure that all of the heat acquired by the feedwater in the one economizer section is transferred to the incoming combustion air in order that the feedwater entering the high pressure feed heaters is such as to produce increased thermal efficiencies that are available through the use of the high pressure feedwater heaters.
Inventors
- 👤 Jr Carl Frederick Horlitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:46
CPC Classifications
F; F01; F01K; F01K15/00; F01K15/02; F01K15/04; F01K7/00; F01K7/34; F01K7/40; Y; Y10; Y10S; Y10S122/00; Y10S122/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
A power plant system including, in combination: a. turbine means; b. a vapor generator having a flow circuit operatively connected for supplying motive fluid to said turbine means, said vapor generator having: i. a furnace, ii. fuel burning means operatively disposed in said furnace, and iii. an exhaust gas outlet from said furnace; c. an economizer having plural sections in heat transfer relation with combustion gases flowing through said exhaust gas outlet; d. means for supplying feedwater to said vapor generator; e. preheater means for preheating said feedwater by extraction fluid from said turbine means; f. means for supplying combustion air to said fuel burning means; g. a tubular air heater for preheating said combustion air; and h. a feedwater train including means for passing feedwater seriatim through one of said economizer sections, said air heater, said feedwater preheater, another of said economizer sections and said vapor generator flow circuit.
Claim 2
Dependent Claim
150 words
A power plant system including, in combination: a. turbine means; b. a vapor generator having a flow circuit operatively connected for supplying motive fluid to said turbine means, said vapor generator having: i. a furnace, ii. fuel burning means operatively disposed in said furnace, and iii. an exhaust gas outlet from said furnace; c. an economizer having plural sections in heat transfer relation with combustion gases flowing through said exhaust gas outlet; d. means for supplying feedwater to said vapor generator; e. preheater means for preheating said feedwater by extraction fluid from said turbine means; f. means for supplying combustion air to said fuel burning means; g. a tubular air heater for preheating said combustion air; and h. a feedwater train including means for passing feedwater seriatim through one of said economizer sections, said air heater, said feedwater preheater, another of said economizer sections and said vapor generator flow circuit.
Claim 3
Dependent Claim
49 words
The combination as recited in claim 1 in which said economizer contains two sections series connected in the gas flow sense in the flow path of said combustion gases and in which the outlet of the downstream section of said economizer connects with the inlet of said air heater.
Claim 4
Dependent Claim
34 words
The combination as recited in claim 1 in which said turbine means includes a high pressure turbine and a low pressure turbine and said feedwater preheater employs extraction fluid from said high pressure turbine.
Claim 5
Dependent Claim
46 words
The combination as recited in claim 3 in which said high pressure turbine and said low pressure turbine each supply extraction fluid to their respective feedwater preheaters and the outlet of said low pressure turbine feedwater preheater communicates with the inlet of said one economizer section.
Claim 6
Dependent Claim
52 words
The combination as recited in claim 2 in which said turbine means includes a high pressure turbine and a low pressure turbine, each supplying extraction fluid to their respective feedwater preheaters, and the outLet of said low pressure turbine feedwater preheater communicates with the inlet of said downstream section of said economizer.
Claim 7
Dependent Claim
29 words
The combination as recited in claim 5 including means for regulating the flow of feedwater through said air heater in response to the feedwater temperature at the outlet thereof.
Claim 8
Dependent Claim
43 words
The combination as recited in claim 6 in which said flow regulating means operates to maintain the feedwater temperature at said air heater outlet substantially the same as the temperature of said feedwater at the inlet of said downstream section of said economizer.
References Cited (Backward Citations)
US3016712A
Cited
US3579990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |