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US3916841A Expired / Lapsed US ⏱️ 0.0 years remaining

Steam generator for a pressurized-water coolant nuclear reactor

Assignee: Siemens AG
•
Filing: 1973-12-14
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Granted: 1975-11-04
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Expires: 1993-12-14
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Abstract

Abstract A steam generator has a vertical cylindrical housing having a steam output outlet, a horizontal tube sheet closing the lower end of this housing, and an inverted U-shaped tube bundle inside of the housing and having vertical inlet and outlet legs with their ends mounted in the tube sheet. Beneath the tube sheet there are inlet and outlet manifolds for the respective ends of the tube bundle so that pressurized-water coolant from a pressurized-water coolant nuclear reactor can be circulated through the tube bundle. A feed-water preheater encloses the lower end of the bundle''s outlet leg and has a feed-water inlet feeding the preheater via a connection from the outside of the housing and a preheated feed-water outlet. A cylindrical shroud peripherally encloses both legs of the tube bundle and the preheater''s outlet discharges upwardly into this cylindrical shroud, the latter forming an annular feed-water descent space between it and the generator''s housing and its lower end opening to the tube sheet for feed water flow thereover and ascent upwardly through the shroud. A steam-water separator is positioned in the housing above the shroud and has an inlet for receiving a steam-water mixture from the latter, and a steam outlet connecting with the housing''s steam output outlet and a separated feed-water outlet connecting with the descent space. An enclosure encloses substantially the full length of the bundle''s inlet or hot leg and is connected at its upper end with the separator''s steam outlet and at its lower end with the housing''s steam output outlet whereby to interconnect these outlets, the steam from the separator being superheated while flowing along the bundle''s inlet leg. A second enclosure encloses the length of the tube bundle''s outlet or cold leg and connects at its lower portion with the preheated feed-water outlet of the preheater and at its upper end with the steam-water mixture inlet of the water separator. Means are provided for force pumping into the preheater''s feed-water inlet, a certain flow of feed-water from the descent space and which mixes with the feed-water fed to the preheater from the outside of the housing.

Inventors

  • 👤 Heinz-Jurgen Schroder
  • 👤 Wolfgang Berger

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 18:52
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/22; F22B37/228; F22B1/00; F22B1/02; F22B1/023; F22B1/025

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 271 words
A steam generator for a pressurized-water coolant nuclear reactor, said generator having a vertical substantially cylindrical housing having a steam output outlet, a horizontal tube sheet closing the lower end of said housing, an inverted Ushaped tube bundle inside of said housing and having vertical inlet and outlet legs with their ends mounted in said tube sheet with the latter having therebeneath inlet and outlet manifolds for said ends respectively, a feed-water preheater enclosing the lower end of said outlet leg and having a feed-water inlet and a preheated feed-water outlet, said housing having an externally supplied feed-water inlet connecting with said preheater''s inlet, a cylindrical shroud peripherally enclosing said tube bundle and into which said preheater''s outlet discharges upwardly, said shroud forming an annular feed-water descent space between it and said housing and opening to said tube sheet for feed-water ascent through said shroud, and a steam-water separator positioned in said housing above said shroud and having an inlet for receiving a steam-water mixture therefrom and having a steam outlet connecting with said steam output outlet and a separated feedwater outlet connecting with said descent space; wherein the improvement comprises means for individually enclosing said inlet leg with an upper end connected with said separator''s steam outlet and a lower end connected with said steam output outlet, means for individually enclosing said outlet leg with a lower portion connected with said preheated feed-water outlet of the preheater and at an upper end connected with said steam-water mixture inlet of the water separator, and means for pumping downwardly to said preheater''s feed-water inlet a flow of feedwater from said descent space.
Claim 2
Dependent Claim 271 words
A steam generator for a pressurized-water coolant nuclear reactor, said generator having a vertical substantially cylindrical housing having a steam output outlet, a horizontal tube sheet closing the lower end of said housing, an inverted Ushaped tube bundle inside of said housing and having vertical inlet and outlet legs with their ends mounted in said tube sheet with the latter having therebeneath inlet and outlet manifolds for said ends respectively, a feed-water preheater enclosing the lower end of said outlet leg and having a feed-water inlet and a preheated feed-water outlet, said housing having an externally supplied feed-water inlet connecting with said preheater''s inlet, a cylindrical shroud peripherally enclosing said tube bundle and into which said preheater''s outlet discharges upwardly, said shroud forming an annular feed-water descent space between it and said housing and opening to said tube sheet for feed-water ascent through said shroud, and a steam-water separator positioned in said housing above said shroud and having an inlet for receiving a steam-water mixture therefrom and having a steam outlet connecting with said steam output outlet and a separated feedwater outlet connecting with said descent space; wherein the improvement comprises means for individually enclosing said inlet leg with an upper end connected with said separator''s steam outlet and a lower end connected with said steam output outlet, means for individually enclosing said outlet leg with a lower portion connected with said preheated feed-water outlet of the preheater and at an upper end connected with said steam-water mixture inlet of the water separator, and means for pumping downwardly to said preheater''s feed-water inlet a flow of feedwater from said descent space.
Claim 3
Dependent Claim 41 words
The steam generator of claim 1 in which said feed-water inlet feeding said preheater provides a larger flow of feed-water thereto and said pumping means supplies a smaller flow of feed-water thereto as these last-mentioned flows are related to each other.
Claim 4
Dependent Claim 52 words
The steam generator of claim 2 in which said housing has an additional feed-water inlet for maintaining feed-water in said descent space at a reserve level substantially above said feed-water pumping means, the latter and the preheater and the latter''s said feed-water inlet being in the lower portion of said vertical housing.
Claim 5
Dependent Claim 65 words
The steam generator of claim 1 in which said pumping means comprises at least one jet pump having a primary jet flow passage interposed between said preheater and said externally supplied feed-water inlet, and a secondary flow passage connecting said descent space with said preheater, the latter and said pump and the preheater''s said feed-water inlet being positioned in the lower portion of said housing.
Claim 6
Dependent Claim 31 words
The steam generator of claim 4 in which said descent space is semicircular adjacent to said jet pump and a semicircular series of said pumps are positioned in this semicircular space.
Claim 7
Dependent Claim 43 words
The steam generator of claim 5 in which said series of jet pumps all have primary passages and a manifold interconnecting the latter and said externally supplied feed-water inlet, said manifold having downwardly extending openings by-passing the primary passages of said jet pumps.
Claim 8
Dependent Claim 25 words
The generator of claim 1 in which said housing has an elutriating pipe opening from said descent space at a level above said pumping means.

References Cited (Backward Citations)

US2336832A Cited
US3141445A Cited
US3139070A Cited
US3807365A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-11-03 1979-05-05 1979-11-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-11-03 1983-05-05 1983-11-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-11-03 1987-05-05 1987-11-04 $7700.00 Window Closed / Lapsed

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