High and low pressure sides-integrating system turbine, long blades thereof and combined cycle power generation system
US6182439A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1999 |
| Grant date | Feb 6, 2001 |
| Priority date | — |
| Expiry date | Aug 31, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2300/171
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A combined cycle power generation system in which a generator is driven by a steam turbine and a gas turbine includes a steam turbine rotor having a mono-block rotor shaft with blades mounted thereon in multi-stages from a high pressure side to a low pressure side and a casing covering the rotor. An inlet temperature of steam to first stage blades is not less than 530.degree. C. and the rotor shaft is made of a Ni--Cr--Mo--V low alloy steel of bainitic structure having a higher creep rupture strength at the high pressure side than at the low pressure side and a 538.degree. C. and 10.sup.5 h creep rupture strength not less than 12 kg/mm.sup.2 at a central portion, and having mounted thereon at the central portion, first stage blades at the high pressure side or FATT of not more than 20.degree. C. Final stage blades are mounted at the low pressure side having a room temperature V-notch impact value of not less than 4 kg/m, and blades of at least a final stage have a value of blade length in inches times revolution in rpm of not less than 125,000 and are made of martensite stainless steel including 8-13 wt. % Cr.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.