Method of controlling seal steam source in a combined steam and gas turbine system
US5388411A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1992 |
| Grant date | Feb 14, 1995 |
| Priority date | — |
| Expiry date | Sep 11, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01D11/06
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of operating a combined gas and steam turbine cycle system including a steam turbine provided with steam from at least one heat recovery steam generator having a high pressure section and a low pressure section, wherein the steam turbine includes high pressure seals and low pressure seals, includes the steps of: a) when the steam turbine is operating at a load below a self-sealing load, supplying steam at a controlled, predetermined pressure to the high and low pressure seals from the high pressure section of the heat recovery steam generator; and b) after steam from the lower pressure section of the heat recovery stem generator exceeds the predetermined pressure, supplying the high and low pressure seals with steam from the lower pressure section of the heat recovery steam generator at a pressure higher than the predetermined pressure, and c) supplying steam from the high pressure section of the heat recovery steam generator whenever a turbine metal inlet temperature exceeds a predetermined reference temperature and turbine load is less than a predetermined reference load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.