US 8,783,042 B2Granted

Method for operating a firing plant

AssigneeALSTOM Technology Ltd

InventorsMauricio Garay, Gianfranco Guidati, Stanka Kokanovic, Stephan Torchalla

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Abstract

A method for operating a firing plant with at least one combustion chamber and at least one burner, especially a gas turbine, includes an operating characteristic for operating the combustion chamber close to the lean extinction limit defined as a burner group staging ratio (BGVRich). Pressure pulsations (PulsActual) measured in the combustion chamber are processed by a filter device (2) and converted into corresponding signals (PulsActual,Filter(t)). An exceeding/falling short of at least one pulsation limiting value (PulsLimit) is monitored by a monitoring device (3) and adapts a pulsation reference value (PulsRef) in dependence upon the monitoring. The processed pressure pulsations (PulsActual,Filter(t)) are then compared with the adapted pulsation reference value (PulsRef,adapt), and, from this, a correction value ΔBGV is determined, by which the burner group staging ratio (BGVRich) is corrected, and as a result operation of the firing plant close to the lean extinction limit is realized.

Claims14

Dependent claims

A method for operating a firing plant having at least one combustion chamber and at least one burner, the firing plant for producing hot gas, the method comprising:

defining an operating characteristic for operating the combustion chamber close to a lean extinction limit, in the form of a burner group staging ratio (BGVRich);
measuring, in the combustion chamber, pressure pulsations (PulsActual(t));
converting said measured pressure pulsations (PulsActual(t)) into corresponding signals;
monitoring exceeding or falling short of at least one pulsation limiting value (Pulsumit);
adapting a pulsation reference value (PulsRef) in dependence upon said monitoring to form an adapted pulsation reference value (PulsRef,adapt);
processing said corresponding signals by a filter device to produce processed pressure pulsations (PulsActual,Filter(t));
comparing the processed pressure pulsations (PulsActual,Filter(t)) to the adapted pulsation reference value (PulsRef,adapt);
determining a correction value (ΔBGV) from said comparing, wherein said determining the correction value (ΔBGV) comprises determining the dependence of the correction value (ΔBGV) on at least one amplification factor (KPI);
and
correcting the burner group staging ratio (BGVRich) based on said correction value (ΔBGV).

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/611,378Filed 12 Sep 2012 · division
Priority: CH 0049/0611 Jan 2006
Published: US 2013/0019605 A124 Jan 2013
Granted: 22 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

F23R 3/34
Characterised by the fuel supply: feeding into different combustion zones
F02C 9/26
Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants: control of fuel supply
F23N 1/002
Regulating fuel supply: using electronic means
F23N 5/16
Systems for controlling combustion: using noise-sensitive detectors

Family

PCT/EP2006/068662Parent of this continuation · filed 20 Nov 2006
Application12/170,513Parent of this division · filed 10 Jul 2008
US 2013/0019605 A1Pre-grant publication · published 24 Jan 2013
Application12/170,513Parent of this continuation
US 2009/0037029 A1Published application
US 8,783,042 B2This patent

From the US filing history. Foreign family members aren’t listed.