Patent US3675423A successfully refreshed from Google Patents.
US3675423A
Expired / Lapsed
US
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Method and means cutting out low temperature corrosion by sulphur containing fuel in the terminal parts of a steam generator in the absence of air-heating means
Assignee: Stein Industrie SA
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Filing: 1970-05-13
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Granted: 1972-07-11
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Expires: 1990-05-13
Abstract
Abstract To prevent corrosion in the economizers and the like structures at the output end of a steam generator burning sulphur-containing fuel and feeding a steam turbine, there is provided a channel connecting the input of the steam generator boiler with the input of the economizer so as to raise the temperature in the latter above corrosion temperature. A gate in said channel allows an adjustment of the flow of water through the latter and a by-pass for said gate allows a low basic permanent flow of water to pass through said channel, which flow can be stopped by a further gate.
Inventors
- 👤 Jean Vidal
- 👤 Jacques Lemoine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:41
CPC Classifications
F; F22; F22D; F22D1/00; F22D1/02; F22D1/14; F01; F01D; F01D25/00; F01D25/007; F01K; F01K9/00; F01K9/02; F01K9/023
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
In the operation of a plant including a steam generator enclosing a boiler and burning sulphur-containing fuel, a steam turbine fed by steam from said generator, heat exchangers for heating the water fed to said boiler and an economizer in the output section of said generator fed with the water heated by said exchangers and returned to the boiler, the steps consisting in diverting a fraction of the water flowing to the boiler to the input of said economizer, and mixing said fraction with said water from said exchangers at the input to said economizer, and controlling the rate of flow of said water diverted from said boiler according to the temperature of the water at the input of said economizer to maintain said temperature at a substantially constant value above corrosion value.
Claim 2
Dependent Claim
133 words
In the operation of a plant including a steam generator enclosing a boiler and burning sulphur-containing fuel, a steam turbine fed by steam from said generator, heat exchangers for heating the water fed to said boiler and an economizer in the output section of said generator fed with the water heated by said exchangers and returned to the boiler, the steps consisting in diverting a fraction of the water flowing to the boiler to the input of said economizer, and mixing said fraction with said water from said exchangers at the input to said economizer, and controlling the rate of flow of said water diverted from said boiler according to the temperature of the water at the input of said economizer to maintain said temperature at a substantially constant value above corrosion value.
Claim 3
Dependent Claim
99 words
In a plant burning sulphur-containing fuel consisting of a steam generator enclosing a boiler, a steam turbine connected to the output of said generator, heat exchangers connected to said steam turbine and an economizer in the output section of said generator connected to said exchangers and said boiler, the improvement comprising a channel connecting the input of said boiler with the input of said economizer, a gate in said channel and means sensitive to the temperature of the input of said economizer for controlling said gate to provide substantial constancy of said temperature at a value above corrosion temperature.
Claim 4
Dependent Claim
99 words
In a plant burning sulphur-containing fuel consisting of a steam generator enclosing a boiler, a steam turbine connected to the output of said generator, heat exchangers connected to said steam turbine and an economizer in the output section of said generator connected to said exchangers and said boiler, the improvement comprising a channel connecting the input of said boiler with the input of said economizer, a gate in said channel and means sensitive to the temperature of the input of said economizer for controlling said gate to provide substantial constancy of said temperature at a value above corrosion temperature.
Claim 5
Dependent Claim
20 words
The plant of claim 2 comprising a by-pass across said gate in said channel and means for closing said by-pass.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |