Method of controlling a fuel split

Patent metadata

Field	Value
Publication number	US-9459008-B2
Application number	US-52313508-A
Country	US
Kind code	B2
Filing date	Jan 15, 2008
Priority date	Jan 15, 2007
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A method of controlling a fuel split of a pilot fuel flow and a main fuel flow in a gas turbine combustor during a load reduction is provided. The rate of change of fuel flow demand is monitored and an additional pilot fuel flow is added. The amount of additional pilot fuel flow depends on the rate of the change in fuel flow demand.

First claim

The invention claimed is:

1. A method of controlling a fuel split into a pilot fuel flow and a main fuel flow in a gas turbine combustor during a load reduction, the method comprising:
monitoring a rate of change of a fuel flow demand; and
adding an additional pilot fuel flow,
wherein an amount of the additional pilot fuel flow depends on the rate of change of the fuel flow demand.

2. The method of controlling a fuel split as claimed in claim 1 , wherein the additional pilot fuel flow is reduced to zero after the load reduction.

3. The method of controlling a fuel split as claimed in claim 2 , wherein a rate limit is applied to the pilot fuel flow when the amount of the additional pilot fuel flow is reduced to zero.

4. The method of controlling a fuel split as claimed in claim 1 , wherein the additional pilot fuel flow is added when a rate of fuel flow demand is less than a given value.

5. The method of controlling a fuel split as claimed in claim 4 , wherein the given value is a negative value.

6. The method of controlling a fuel split as claimed in claim 1 , further comprising subtracting the additional pilot fuel from the main fuel flow in order to keep a total amount of fuel flow constant.

7. The method of controlling a fuel split as claimed in claim 1 , wherein the load reduction is a rapid load reduction.

Assignees

• Skipper Dorian
• Siemens Ag

Inventors

• Skipper Dorian

Classifications

• F23N2231/06

  for flame failures · CPC title

• F02C9/34

  Joint control of separate flows to main and auxiliary 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

• F23N5/242

  using electronic means · CPC title

• F23R3/343

  Pilot flames, i.e. fuel nozzles or injectors using only a very small proportion of the total fuel to insure continuous combustion (ignition in gas-turbine plants F02C7/264; pilot flame igniters F23Q9/00) · CPC title