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

• US 6,385,975 B1
• Filed: 08/15/2001
• Issued: 05/14/2002
• 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:
  US09/929,345
• Publication Number:
  US 20020026784A1
• Time in Patent Office: 272 Days
• Field of Search: 60/392.81, 607/34
• US Class Current: 60/734
• 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 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.