Fuel supply pipeline system for gas turbine

Patent metadata

Field	Value
Publication number	US-10830156-B2
Application number	US-201415113113-A
Country	US
Kind code	B2
Filing date	Feb 19, 2014
Priority date	Feb 19, 2014
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

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

The invention claimed is:

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 monitor directly connected to the second pipeline downstream of the control valve in a gas flow direction, the monitor being 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 greater than a threshold in-pipe pressure, wherein the first pipeline includes a first pressure tolerance rating, and the second pipeline includes a second pressure tolerance rating, less than the first pressure tolerance rating, wherein
the monitor comprises a calculator and a second pressure sensor disposed in the first pipeline, the calculator being configured to calculate the determined in-pipe pressure of the second pipeline on the basis of a pressure measured by the second pressure sensor and a pressure drop through the control valve,
the monitor is configured to detect a degree of opening of the control valve, and wherein the calculator is configured to determine a pressure drop through the control valve according to the degree of opening of the control valve, and
the calculator 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,
TO=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.

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 greater than the threshold in-pipe pressure.

3. The fuel supply pipeline system of claim 2 , wherein a flow meter including a pressure sensor is disposed in the second pipeline, the monitor comprises a calculator configured to calculate the in-pipe pressure of the second pipeline on the basis of a pressure measured by the pressure sensor of the flow meter and a measured pressure drop of a second pipeline part between an outlet of the control valve and the flow meter.

4. The fuel supply pipeline system of claim 3 , 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 pressure rating of the second pipeline.

5. The fuel supply pipeline system of 3 , wherein the measured pressure drop of the second pipeline part is calculated on the basis of the following formula:

dp_PIPE
=

1

p
⁢

⁢
3

×

[

m
.

2

×

T
⁢

⁢
0

ρ
N

×

(

3600
514

)

2

×

(

1

k
v

)

2

]

where dp_PIPE=pressure drop of the second pipeline part,
P3=pressure measurement value detected by pressure sensor of flow meter,
kv=pipeline flow coefficient,
T0=temperature value of gas in pipe,
{dot over (m)}=mass flow rate value,
ρ N =standard density.

6. A gas turbine system, comprising:
the fuel supply pipeline system of claim 2 , and a gas turbine including:
a combustion chamber;
at least one burner located in the combustion chamber;
an air supplier to supply compressed air to the combustion chamber; and
a turbine in communication wi

Assignees

• Siemens Ag
• Cano Wolff Mariano
• Choi Du Fhan
• Hausmann Kai
• Lv song jun
• Schneider peter andreas
• Schwager Julius

Inventors

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

Classifications

• F02C7/228 Primary

  Dividing fuel between various burners · CPC title

• F02C9/28

  Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed (F02C9/30 - F02C9/38, F02C9/44 take precedence) · CPC title

• F05D2220/32

  in gas turbines · CPC title

• F05D2270/3013

  Outlet pressure · CPC title

• F02C7/264

  Ignition · CPC title