Method for operating a combustion device including injecting a fluid together with diluent fuel to address combustion pulsations

Patent metadata

Field	Value
Publication number	US-9816708-B2
Application number	US-201213592812-A
Country	US
Kind code	B2
Filing date	Aug 23, 2012
Priority date	Aug 30, 2011
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A method for operating a combustion device includes supplying a fuel and an oxidizer into the combustion device and burning them. According to the method, during at least a part of a transient operation, an additional fluid is supplied together with the fuel, and its amount is regulated to counteract combustion pulsations.

First claim

What is claimed is:

1. Method for operating a combustion device comprising:
supplying a fuel and an oxidizer into the combustion device and burning them;
supplying, during at least a part of a transient operation, an additional fluid together with the fuel, the transient operation including one of a start-up of the combustion device, a switch-off of the combustion device or a fuel switch-over of the combustion device; and
regulating the amount of the additional fluid to counteract combustion pulsations, wherein the additional fluid is an inert fluid, and the additional fluid is at least partly mixed with the fuel prior to injection.

2. The method according to claim 1 , comprising choosing a first parameter indicative of a fuel feed and supplying the additional fluid only when the fuel feed reaches a predetermined value of the first parameter.

3. The method according to claim 2 , wherein the first parameter is the fuel mass flow (M).

4. The method according to claim 3 , comprising:
supplying the additional fluid only when the fuel mass flow is below a critical value at which pulsations start to generate.

5. The method according to claim 2 , wherein the first parameter is a differential pressure (ΔP) between a fuel supply and the inside of the combustion device.

6. The method according to claim 2 , comprising choosing a second parameter indicative of the fuel and additional fluid feed, the regulating including maintaining the second parameter above or below a second predetermined value or maintaining the second parameter within a prefixed range (R).

7. The method according to claim 6 , wherein the second parameter range (R) corresponds to the second predetermined value of the second parameter ±10% or to the second predetermined value of the second parameter ±1% or to the second predetermined value of the second parameter.

8. The method according to claim 6 , wherein a bottom or a top of the range (R) correspond to the second predetermined value (SPc) of the second parameter (SP).

9. The method according to claim 6 , wherein the second parameter is the fuel and additional fluid mass flow (M).

10. The method according to claim 6 , wherein the second parameter is the differential pressure (ΔP) between a fuel and additional fluid supply and the inside of the combustion device.

11. The method according to claim 2 , wherein the predetermined value is a value at which pulsations start to generate.

12. The method according to claim 1 , wherein the fuel is supplied into the combustion device via a fuel supply, wherein the additional fluid is supplied into this fuel supply.

13. The method according to claim 1 , wherein the fuel is a liquid fuel and the additional fluid is also liquid.

14. The method according to claim 1 , wherein the fuel is a gaseous fuel and the additional fluid is also gaseous.

15. The method according to claim 1 , comprising:
supplying the additional fluid together with the fuel to create a combined flow of fluid and fuel, and the combined flow is then mixed with an oxidiser during at least a part of the transient operation.

16. The method according to claim 1 , comprising:
counteracting the combustion pulsations by minimising the formation of combustion pulsations.

17. Method for operating a combustion device comprising:
supplying a fuel and an oxidizer into the combustion device and burning them;
supplying, during at least a part of a transient operation, an additional fluid together with the fuel;
regulating the amount of the additional fluid to counteract combustion pulsations; and
choosing a first parameter indicative of a fuel feed and supplying the additional fluid only when the fuel feed reaches a predetermined value of the first parameter, wherein the first parameter is a differential pressure (ΔP) between a fuel supply and the inside of the combustion device.

18. Method for operating a combustion device comprising:
supplying a fuel and an oxidizer into the combustion device and burning them;
supplying, during at least a part of a transient operation, an additional fluid together with the fuel;
regulating the amount of the additional fluid to counteract combustion pulsations;
choosing a first parameter indicative of a fuel feed and supplying the additional fluid only when the fuel feed reaches a predetermined value of the first parameter;
choosing a second parameter indicative of the fuel and additional fluid feed, the regulating including maintaining the second parameter above or below a second predetermined value or maintaining the second parameter within a prefixed range (R); and
wherein the second parameter prefixed range (R) corresponds to the second predetermined value of the second parameter ±10% or to the second predetermined value of the second parameter ±1% or to the second predetermined value of the second parameter.

Assignees

• Bothien Mirko Ruben
• Zajadatz Martin
• Pennell Douglas Anthony
• Ansaldo Energia Ip Uk Ltd

Inventors

• Bothien Mirko Ruben
• Zajadatz Martin
• Pennell Douglas Anthony

Classifications

• F23R3/36 Primary

  Supply of different fuels · CPC title

• F23R2900/00013

  Reducing thermo-acoustic vibrations by active means · CPC title

• F23L2900/07003

  Controlling the inert gas supply · CPC title

• F23R3/28

  characterised by the fuel supply (burners F23D) · CPC title

• F23K5/10 Primary

  Mixing with other fluids · CPC title