Gas turbine fuel system comprising fuel oil distribution control system, fuel oil purge system, purging air supply system and fuel nozzle wash system

• US 6,389,795 B1
• Filed: 08/15/2001
• Issued: 05/21/2002
• Est. Priority Date: 05/08/1998
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Nakamoto, Yukimasa
• Primary Examiner(s): Freay, Charles G.
• Assistant Examiner(s): Rodriguez, William H.
• Application Number:
  US09/929,346
• Publication Number:
  US 20020026785A1
• Time in Patent Office: 279 Days
• Field of Search: 60/390.94, 607/34
• US Class Current: 60/39.094
• CPC Class Codes: F01D 25/002 Cleaning of turbomachines
• CPC Class Codes: F02C 3/22 the fuel or oxidant being gaseous at standard temperature and pressure F02C3/28 takes precedence
• CPC Class Codes: F02C 3/24 the fuel or oxidant being liquid at standard temperature and pressure
• CPC Class Codes: F02C 7/22 Fuel supply systems
• CPC Class Codes: F02C 7/232 Fuel valves control of fuel supply by means of fuel metering valves F02C9/263; Draining valves or systems valves in general F16K
• CPC Class Codes: F02C 9/40 specially adapted to the use of a special fuel or a plurality of fuels
• CPC Class Codes: F05D 2260/602 Drainage

Abstract

A plurality of fuel nozzles X₁ and X₂ in combustor X are supplied with fuel gas from a fuel gas system and fuel oil from a fuel oil system, respectively. Gas turbine operation is performed with fuel being changed over to either gas or oil. Fuel oil distribution control system A controls oil flowing into a plurality of fuel pipings. When oil is changed over to gas, fuel oil purge system B is supplied with air of an appropriate temperature and pressure from purging air supply system C. This air flows into fuel oil pipings and nozzles X₂ for purging residual oil therein. Fuel nozzle wash system D is supplied with water by-passing from a wash water tank for compressor washing. This water flows through nozzles X₂ for washing thereof.

Claims

1. 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.