Claims
- 1. A gas turbine fuel system comprising a fuel oil supply system for supplying fuel oil to a plurality of fuel nozzles and a fuel gas supply system for supplying fuel gas to said plurality of fuel nozzles so that gas turbine operation may be done with fuel being changed over to either one of oil and gas, further comprising a fuel oil distribution control system for controlling flow rate and pressure of fuel oil in each of fuel pipings connecting to said fuel nozzles within a predetermined range by a control means provided in said fuel oil supply systems; a fuel oil purge system provided close to said fuel nozzles in said fuel oil supply system for purging residual oil in said fuel oil supply system and fuel nozzles by air; a purging air supply system for supplying air to said fuel oil purge system; and a fuel nozzle wash system for supplying wash water to upstream side of said fuel nozzles in said fuel oil supply system connected to said fuel nozzles.
- 2. A gas turbine fuel oil distribution control system, wherein there are provided a series control valve comprising a plurality of valves for controlling pressure loss in a fuel oil supply system so as to correspond to a plurality of fuel nozzles, each of said plurality of valves being driven controllably at same time with same opening; a drive unit for driving said series control valve; and a control unit for controlling said drive unit, and said control unit is inputted with a system differential pressure signal and a load signal of said fuel oil supply system to put out to said drive unit a signal to throttle said series control valve approximately to an intermediate opening while the system differential pressure is a predetermined low differential pressure and a signal to open said series control valve fully for a predetermined time when said system differential pressure comes to a predetermined high differential pressure.
- 3. A gas turbine fuel oil purge system in a gas turbine fuel oil supply system comprising a plurality of fuel oil supply pipings for supplying fuel oil to a plurality of fuel nozzles via a header; and a drain piping connected to said plurality of fuel oil supplying pipings, wherein there are provided a sealing connection pipe close to said fuel nozzles in each of said fuel oil supply pipings between said header and fuel nozzles; and a purging air supply piping for supplying air to each said sealing connection pipe, and each said sealing connection pipe causes the air from said purging air supply piping to flow toward said fuel nozzles as well as to flow into said fuel oil supply pipings on the opposite sides of said fuel nozzles to be discharged from said drain piping.
- 4. A gas turbine fuel nozzle purging air supply system in a gas turbine air system for supplying air, extracted from compressor outlet air and cooled at an air cooler, to a rotor as rotor cooling air as well as for supplying air, diverging from said air extracted from compressor outlet air and being elevated of pressure at a pressure elevation compressor, to be used as fuel nozzle purging air, wherein said air cooler comprises a first cooler and a second cooler, air cooled at said first cooler is used for said rotor cooling air and air diverging from the air cooled at said first cooler is sent to said second cooler to be cooled and then sent to said pressure elevation compressor.
Priority Claims (4)
Number |
Date |
Country |
Kind |
10-126039 |
May 1998 |
JP |
|
10-126040 |
May 1998 |
JP |
|
10-127347 |
May 1998 |
JP |
|
10-128938 |
May 1998 |
JP |
|
Parent Case Info
[0001] This is a Divisional Application of prior U.S. patent application Ser. No. 09/305,459, filed May 6, 1999.
Divisions (1)
|
Number |
Date |
Country |
Parent |
09305459 |
May 1999 |
US |
Child |
09781420 |
Feb 2001 |
US |