Method and apparatus for renewing a vertically disposed steam generator, in particular in nuclear power plants
US4905630A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1988 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Dec 19, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S122/14
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A vertically disposed steam generator includes a pressure vessel containing: a tube plate, chambers, a bundle of U-shaped bent heating tubes with supporting anchors, a steam trap above the heating tubes, and tubes for a secondary medium discharging into the pressure vessel. The heating tubes have ends guided through openings in the tube plate and discharging a primary medium into the chambers. A method and apparatus for renewing the steam generator includes disconnecting the tubes for the secondary medium; dividing the pressure vessel into an upper region forming a steam dome and a middle region with a jacket surrounding the bundle of heating tubes while leaving a lower region having the chambers; successively raising the steam dome, the steam trap and the jacket; disconnecting the heating tubes and the anchors above the tube plate, and raising the entire bundle; removing remaining parts of the heating tubes from the tube plate and preparing free openings for receptacles of new heating tubes; introducing a prefabricated new bundle having new anchors and heating tubes, introducing the ends of the new anchors and heating tubes into the openings of the tube plate and connecting the en…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.