US3906905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam generator
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1974-08-20
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Granted: 1975-09-23
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Expires: 1994-08-20
Abstract
Abstract In a steam generator provided with a tube plate pierced by holes to which are connected the ends of a bank of U-tubes adapted to carry a circulation of primary fluid and surrounded externally by a secondary fluid, the ends of the U-tubes are disposed in spaced relation in the tube plate with a pitch of decreasing value in the direction of flow of the secondary fluid, the tube arms through which the hot primary fluid circulates being disposed with a pitch of higher value than that of the tube arms through which the cold primary fluid circulates.
Inventors
- 👤 Jean-Louis Andrieu
- 👤 Yves Bonnet
- 👤 Jean-Jacques Verdeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:15
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/02; F22B1/023; F22B1/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
A steam generator comprising a tube plate, holes in said plate, a bank of U-tubes having ends connected in the holes, said U-tubes, receiving a circulation of a primary fluid and a secondary fluid externally surrounding said U-tubes, wherein the ends of the U-tubes of the bank are disposed in spaced relation in the tube plate with a pitch of decreasing value in the direction of flow of the secondary fluid, the tube arms through which the hot primary fluid circulates being disposed with a pitch of higher value than that of the tube arms through which the cold primary fluid circulates.
Claim 2
Dependent Claim
102 words
A steam generator comprising a tube plate, holes in said plate, a bank of U-tubes having ends connected in the holes, said U-tubes, receiving a circulation of a primary fluid and a secondary fluid externally surrounding said U-tubes, wherein the ends of the U-tubes of the bank are disposed in spaced relation in the tube plate with a pitch of decreasing value in the direction of flow of the secondary fluid, the tube arms through which the hot primary fluid circulates being disposed with a pitch of higher value than that of the tube arms through which the cold primary fluid circulates.
Claim 3
Dependent Claim
44 words
A steam generator according to claim 1, wherein the U-tubes of the bank are disposed in parallel planes, the tube arms through which the hot primary fluid circulates being disposed in spaced relation in a lateral direction contained in the plane of said tubes.
Claim 4
Dependent Claim
53 words
A steam generator according to claim 1, wherein the tubes are disposed in radial planes, the tube arms through which the hot primary fluid circulates being disposed in spaced relation in a central zone of the tube plate surrounded by a peripheral zone containing the arms through which the cold primary fluid circulates.
Claim 5
Dependent Claim
44 words
A steam generator according to claim 1, wherein the tube arms through which the hot primary fluid circulates delimit transverse passageways occupied by ducts having their openings in the vicinity of the tube plate for the suction of sludges formed in the secondary fluid.
Claim 6
Dependent Claim
70 words
A steam generator according to claim 4, wherein the transverse passageways are supplied with an additional flow of secondary fluid circulated through plunger tubes disposed vertically between at least a certain number of the U-tubes, said plunger tubes being each associated at the end remote from the tube plate with a venturi for mixing with the reheated secondary fluid which is withdrawn from the upper section of the tube bank.
Claim 7
Dependent Claim
51 words
A steam generator according to claim 1 including spacer plates to hold the tubes of the bank in position each of said spacer plates covering a small portion of the tube bank and forming a baffle system which promotes stirring of the emulsion around the two legs of said tube bank.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |