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

• US 6,216,439 B1
• Filed: 05/06/1999
• Issued: 04/17/2001
• Est. Priority Date: 05/08/1998
• Status: Expired due to Term

• Current Assignee: mitsubishi hitachi power systems, ltd. (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Nakamoto, Yukimasa
• Primary Examiner(s): Thorpe, Timothy S.
• Assistant Examiner(s): Rodriguez, William H
• Application Number:
  US09/305,459
• Time in Patent Office: 712 Days
• Field of Search: 60/390.5, 60/390.7, 60/395.5, 60/395.3, 60/390.94, 60/393.3, 60/390.4, 134/169.R, 134/169.A, 134/166.R
• 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

Plurality of fuel nozzles X₁ and X₂ in combustor X are supplied with fuel gas from fuel gas system and fuel oil from fuel oil system, respectively. Gas turbine operation is done with fuel being changed over to either gas or oil. Fuel oil distribution control system A controls oil flowing into plurality of fuel pipings. When oil is changed over to gas, fuel oil purge system B is supplied with air of 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 wash water tank for compressor washing. This water flows through nozzles X₂ for washing thereof.

Claims

1. A gas turbine fuel nozzle wash system in a gas turbine wash system comprising a fuel oil supply system for supplying fuel oil to fuel nozzles in a combustor;

a compressor wash water supply system for supplying wash water to a compressor which supplies compressed air to said combustor; and

a wash water tank for supplying the wash water to said compressor wash water supply system, wherein there are provided a wash water by-pass piping and an opening/closing valve between said fuel oil supply system and compressor wash water supply system and when said opening/closing valve is opened, the wash water is supplied to said fuel nozzles from said wash water tank via said fuel oil supply system to be injected from said fuel nozzles so that said fuel nozzles are washable.