Fuel supply pipeline system for gas turbine

Patent metadata

Field	Value
Publication number	US-2017009666-A1
Application number	US-201415113113-A
Country	US
Kind code	A1
Filing date	Feb 19, 2014
Priority date	Feb 19, 2014
Publication date	Jan 12, 2017
Grant date	—

Abstract

A fuel supply line system used for a gas turbine, including: fuel gas control valves used for controlling delivery to the gas turbine; a first line used for connecting the fuel gas source to the control valves; a second line used for connecting the control valves to the gas turbine; a monitoring device, configured to be used for determining the pressure inside the pipe at the outlet of the second line near said control valve; and a controller, configured to reduce the effective flow area of the pressure control valves or close the control valves when the determined pressure inside the pipe of the second line is greater than a predetermined pressure.

First claim

1 . A fuel supply pipeline system for a gas turbine, comprising:
a control valve to control a gas conveyed to the gas turbine; a first pipeline to connect a gas source to the control valve; a second pipeline to connect the control valve to the gas turbine; a monitoring device, configured to determine an in-pipe pressure of the second pipeline at a position adjacent to an outlet of the control valve; and a controller, configured to reduce an effective through-flow area of the control valve or close the control valve when the in-pipe pressure determined in the second pipeline is relatively greater than a threshold in-pipe pressure.

2 . The fuel supply pipeline system of claim 1 , further comprising:
a blocking valve, disposed upstream of the control valve, the controller being configured to close the blocking valve when the determined in-pipe pressure is relatively greater than the threshold in-pipe pressure.

3 . The fuel supply pipeline system of claim 1 , wherein the control valve is one of multiple control valves connected in parallel, the controller being configured to close all the multiple control valves when the in-pipe pressure determined in the second pipeline adjacent to an outlet of any one of the multiple control valves is relatively greater than the threshold in-pipe pressure.

4 . The fuel supply pipeline system of claim 1 , wherein the controller is configured to shut down the fuel supply pipeline system when a determined in-pipe pressure is relatively greater than the threshold in-pipe pressure.

5 . The fuel supply pipeline system of claim 1 , wherein the first pipeline includes a first pressure tolerance rating, and the second pipeline includes a second pressure tolerance rating, relatively less than the first pressure tolerance rating.

6 . The fuel supply pipeline system of claim 5 , wherein the threshold in-pipe pressure is determined on the basis of the second pressure tolerance rating and is relatively less than or equal to the second pressure tolerance rating.

7 . The fuel supply pipeline system of claim 5 , wherein the first pressure tolerance rating is greater than or equal to PN63, while the second pressure tolerance rating is less than or equal to PN50 and greater than or equal to PN20.

8 . The fuel supply pipeline system of claim 1 , wherein the monitoring device comprises a first pressure sensor disposed on the second pipeline in a position adjacent to an outlet of the control valve.

9 . The fuel supply pipeline system of claim 1 , wherein the monitoring device comprises a calculating unit and a second pressure sensor disposed in the first pipeline, the calculating unit being configured to calculate a determined in-pipe pressure on the basis of a pressure measured by the second pressure sensor and a pressure drop through the control valve.

10 . The fuel supply pipeline system of claim 9 , wherein the monitoring device also comprises a pressure difference sensor mounted on the control valve, to connect a pressure drop through the control valve.

11 . The fuel supply pipeline system of claim 9 , wherein the monitoring device is configured to detect a degree of opening of the control valve, and wherein the calculating unit is configured to determine a pressure drop through the control valve according to the degree of opening of the control valve.

12 . The fuel supply pipeline system of claim 11 , wherein the calculating unit is configured to determine the pressure drop through the control valve on the basis of the following formula:

m
.

=

Kv_CV
×
110
×
P



0
×

(

1
-

dp_CV

P



0

3
×

k
1.4

×

X
T

)

×
Fp
×

T



0
×
Z

dp_CV

P



0

×
M

where P0=pressure detected by second pressure sensor,

dp_CV=pressure drop,
Kv_CV=flow coefficient corresponding to degree of opening of control valve,
T0=temperature value of gas in pipe,
{dot over (m)}=mass flow rate value
M=molar mass of gas in pipe,
k=adiabatic index of gas in pipe,
X T =pressure difference ratio parameter of control valve,
F p =pipeline arrangement influence factor,
Z=compressibility factor of gas in pipe.

13 . The fuel supply pipeline system of claim 1 , wherein a flow meter including a pressure sensor is disposed in the second pipeline, the monitoring device comprises a calculating unit configured to calculate the in-pipe pressure on the basis of a pressure measured by the pressure sensor of the flow meter and a pressure drop of a second pipeline part between an outlet of the control valve and the flow meter.

14 . The fuel supply pipeline system of claim 13 , wherein the pressure drop of the second pipeline part is a pressure drop of the second pipeline part determined on the basis of a maximum permitted pressure of the second pipeline.

15 . The fuel supply pipeline system of 13 , wherein the pressure drop of the second pipeline part is calculated on the basis of the following formula:

dp_PIPE
=

1

p



3

×

[

m
.

2

Assignees

• Cano Wolff Mariano
• Choi Dufhan
• Hausmann Kai
• Lv Songjun
• Schneider Peter-Andreas
• Schwager Julius
• Siemens Ag

Inventors

• Cano Wolff Mariano
• Choi Du-Fhan
• Hausmann Kai
• Lv song jun
• Schneider Peter-Andreas
• Schwager Julius

Classifications

• 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

• F01D21/003

  Arrangements for testing or measuring (for measuring vibrations G01H) · CPC title

• F02C7/264

  Ignition · CPC title

• F05D2220/32

  in gas turbines · CPC title

• F05D2240/35

  Combustors or associated equipment · CPC title