Combustion Control

Contacts : Danielle MAKAIRE, P.Ngendakumana


The aim of combustion control is to determine the excess air at which the efficiency is maximum while pollutant emissions (as soot, CO, NOx) are minimum. The principle of this control is based on the measurement of a parameter that is linked to combustion quality and allows a retroaction to the burner parameters to adjust the air fuel ratio.

To this aim, flame spectroscopy (using a spectroradiometer) was implemented on a 400kW boiler equipped with quartz windows in order to realize an automatic and continuous combustion control.

Another approach is to analyze the flue gases by the mean of gas sensors (semiconductor materials that detects gas species like O2 or CO). Two sensors were placed at the chimney of a 24kW fuel oil boiler in addition to the classical combustion gas analyzers. The first sensor is an Yttrium Stabilized Zirconia (YSZ) sensor that detects unburned species and the second one is a Ga2O3 sensor that detects CO.

Test rig

There are two test rigs in this study:

Semi-industrial boiler equipped with a side-window in order to visualize the flame (400kW).



Danielle Makaire
Département d'aérospatiale et mécanique / Thermotechnique
Adress: ULg - Bât. B49 Thermotechnique
chemin des Chevreuils 7
4000 Liège 1 Belgique
Tel. : +32 4 3664821
Fax : +32 4 3664812


This project is performed in the frame of IEA implementing agreement with the financial support of the SPW-DGO4.

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