Gas turbine with a bypass line for improved fuel line flushing, and method for flushing a gas turbine

Patent metadata

Field	Value
Publication number	US-2016305276-A1
Application number	US-201415100738-A
Country	US
Kind code	A1
Filing date	Dec 3, 2014
Priority date	Dec 9, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

A gas turbine with a burner, which gas turbine has at least one fuel feed line and at least one fuel outflow line, wherein a flushing water line is connected fluidically to the fuel feed line, and wherein a leakage oil tank is connected fluidically via a drainage line to the fuel outflow line and the connection of the fuel outflow line and the drainage line is provided at a point downstream of at least one closure valve in the fuel outflow line, wherein a bypass line is connected fluidically to the fuel outflow line upstream of the closure valve, which bypass line connects the fuel outflow line fluidically to the leakage oil tank.

First claim

1 . A gas turbine comprising:
a burner which has at least one fuel supply line and at least one fuel removal line, wherein the fuel supply line is fluidically connected to a flush water line, and wherein the fuel removal line is fluidically connected, via a drainage line, to a leakage oil tank and the fuel removal line and the drainage line are connected at a point downstream of at least one closure valve in the fuel removal line, a bypass line upstream of the at least one closure valve, wherein the bypass line is fluidically connected to the fuel removal line, which bypass line fluidically connects the fuel removal line to the leakage oil tank.

2 . The gas turbine as claimed in claim 1 ,
wherein the bypass line has at least one shutoff valve.

3 . The gas turbine as claimed in claim 1 ,
wherein the drainage line has at least one shutoff valve.

4 . The gas turbine as claimed in claim 1 ,
wherein the fuel removal line has at least two closure valves and the drainage line is fluidically connected to the fuel removal line between the two closure valves.

5 . A method for flushing a gas turbine, the method comprising:
introducing flush water from a flush water line into a fuel supply line under pressure such that the flush water displaces at least part of the fuel in the fuel supply line in the direction of the burner; removing fuel from the fuel removal line by means of the flush water; interrupting part of the removal of fuel in the fuel removal line by closing a closure valve in the fuel removal line at a time T1; maintaining the removal of fuel from the fuel removal line via a bypass line into a leakage oil tank after the time T1, wherein the bypass line is fluidically connected to the fuel removal line upstream of the closure valve.

6 . The method as claimed in claim 5 ,
wherein the introduction of flush water from the flush water line into the fuel supply line during shutdown of the gas turbine takes place as long as a compressor end pressure of at least 1.5 bar still prevails.

7 . The method as claimed in claim 5 ,
wherein after a second time T2, greater than the first time T1, at least one shutoff valve in the bypass line is closed in order to thus interrupt the removal of fuel from the fuel removal line via the bypass line into the leakage oil tank.

8 . The gas turbine as claimed in claim 2 ,
wherein the bypass line has two shutoff valves.

9 . The method as claimed in claim 5 ,
wherein the introduction of flush water from the flush water line into the fuel supply line during shutdown of the gas turbine takes place as long as a compressor end pressure is above the pressure level of the fuel supply container.

10 . The method as claimed in claim 5 , wherein the gas turbine comprises:
a burner which has at least one fuel supply line and at least one fuel removal line, wherein the fuel supply line is fluidically connected to a flush water line, and wherein the fuel removal line is fluidically connected, via a drainage line, to a leakage oil tank and the fuel removal line and the drainage line are connected at a point downstream of at least one closure valve in the fuel removal line, and a bypass line upstream of the at least one closure valve, wherein the bypass line is fluidically connected to the fuel removal line, which bypass line fluidically connects the fuel removal line to the leakage oil tank.

Assignees

• Siemens Ag

Inventors

• Meisl Jürgen
• Smith James

Classifications

• F01D25/002 Primary

  Cleaning of turbomachines · CPC title

• F23R2900/00004

  Preventing formation of deposits on surfaces of gas turbine components, e.g. coke deposits · CPC title

• F23K2300/203

  Purging · CPC title

• F05D2260/602

  Drainage · CPC title

• F02C7/232

  Fuel valves {(control of fuel supply by means of fuel metering valves F02C9/263)}; Draining valves or systems (valves in general F16K) · CPC title