Steam generator with axial flow preheater
US5419391A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1992 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Jun 17, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F9/0229
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An improved heat exchanger utilizing a primary heated fluid to vaporize a secondary fluid flowing axially therethrough including a preheater assembly located within a cold leg side of the heat exchanger to allow axial flow of the secondary fluid through a preheater assembly to heat the secondary fluid to it boiling point temperature. The heat exchanger generally comprises a vertical shell portion with a tubesheet disposed adjacent a lower end thereof and a tube bundle which includes a plurality of U-shaped tubes through which the primary fluid flows. The preheater assembly is located in the vicinity of the tubesheet wherein the secondary fluid enters the preheater through a fluid inlet nozzle into a lower feedwater inlet box which is disposed around the inlet nozzle for dispersing the secondary fluid from the nozzle over a greater area. Specifically, the feedwater inlet box may include a double-perforated plate assembly whose flow resistance produces a low velocity uniform introduction of feedwater into the tube bundle. This water flows upward providing axial-counter flow and enhances heat transfer. This cold water is introduced near the coldest end of the tubes where it is most ef…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.