Claims
- 1. A method for operating a non-reheat combined cycle power plant including a boiler and a steam turbine of a type including a plurality of turbine sections including at least a first turbine section and a second turbine section, the turbine receiving steam under pressure and successively expanding the steam through the turbine sections resulting in a total pressure drop through the turbine, the method comprising the steps of;
- adjusting the pressure drop between an exhaust of the first turbine section and an inlet of the second turbine section; and
- supplying secondary steam to an inlet of a final turbine section in order to increase the overall steam temperature at the inlet of the final turbine section.
- 2. A trimming system for a steam turbine of a type including a plurality of turbine sections including at least a first turbine section and a second turbine section, the turbine receiving steam under pressure and successively expanding the steam through the turbine sections resulting in a total pressure drop through the turbine, the trimming system comprising:
- (a) first fluid conduit coupled at a first end to an exhaust of the first turbine section and at a second end of an inlet of the second turbine section, said first fluid conduit providing non-reheated steam to said second turbine section;
- (b) a second fluid conduit coupled to the first fluid conduit forming a bypass between the first end and second end of the first fluid conduit; and
- (c) a pressure regulator coupled to the second fluid conduit, the pressure regulator being adjustable to selectively adjust a portion of the total pressure drop between the exhaust of the first turbine section and the inlet of the second turbine section.
- 3. The trimming system of claim 2 wherein the pressure regulator is a valve.
- 4. A trimming system for a steam turbine of a type including a plurality of turbine sections including at least a first turbine section and a second turbine section, the turbine receiving steam under pressure and successively expanding the steam through the turbine sections resulting in a total pressure drop through the turbine, the trimming system comprising;
- adjusting means for selectively adjusting a portion of the total pressure drop between an exhaust of the first turbine section and an inlet of the second turbine section; and
- means for supplying secondary steam to an inlet of a final turbine section in order to increase the overall steam temperature at the inlet of the final turbine section.
- 5. The trimming system of claim 4 wherein the adjusting means comprises:
- (a) a fluid conduit having a first end connected to the exhaust of the first turbine section and a second end connected to the inlet of the second turbine section; and
- (b) a pressure regulator coupled between the first and second ends of the fluid conduit to regulate the pressure drop between the exhaust of the first turbine section and the inlet of the second turbine section.
- 6. The trimming system of claim 4 wherein the pressure regulator is a valve.
Parent Case Info
This application is a division of Ser. No. 08/495,012, filed Jun. 27, 1995 now U.S. Pat. No. 5,660,037.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4080790 |
Oberle |
Mar 1978 |
|
4598551 |
Dimitroff, Jr. et al. |
Jul 1986 |
|
5201180 |
Girbig |
Apr 1993 |
|
Divisions (1)
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Number |
Date |
Country |
Parent |
495012 |
Jun 1995 |
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