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Show Measurement and Interpretation - 2 - lFRF-~ of Flames Issued from a Generic Multi-Fuel Burnet' 1. INTRODUCTION Air pollution concerns have led in many industrialized countries to new legislation on atmospheric pollutant emissions. The formulation of legislation has been accompanied by an acceleration of research to provide industry with combustion equipment capable of meeting new limits. The MFB project, co-funded by the EC and the IFRF Members follows the objective of developing new burners which can drastically reduce NOx emissions and meet increasingly more stringent emissions limits. This project is in direct line with the IFRF research carried out over the last 20 years on NOx reduction techniques on a wide range of fuels and combustion applications. The research objectives of the MFB project are: • to generate engineering information required for designing low NOx multifuel burners capable of firing gas and/or oil with acceptable CO and particulate emissions, • to develop a generic multi-fuel semi-industrial scale burner, • to provide industry with methods of scaling. Scaling to industrial applications will be accomplished through application of mathematical modeling. From this modeling effort guidelines will be deduced for the adaptation of the principles of this generic burner design to particular applications. The preliminary success of modeling of this system shows the importance of careful determination of the boundary conditions required to obtain reliable predictions of the fluid dynamics of interest in practical combustion devices. 2. EXPERIMENTAL 2.1. Equipment 2.1.1. Burner Design The near burner zone configuration of Furnace No. 1 is depicted in Fig. 2.1. The conical quarl has a half angle of 20°, a throat diameter of 300 mm and a length of 124 mm. The quad expansion, defined as the ratio of the outlet to throat diameter, is 1.3. The burner was designed for a combustion air velocity of 39 m/s for an air preheat temperature of 320°C. |
