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This paper is concerned with the experimental investigation of stability and emission in a LPG-air premixed coaxial jet burner.  By varying the fuel-air ratio in the core flow stream, the flame stability of this coaxial jet flame burner is carried out experimentally, extensively over a wide range of core velocity at 4-16 m/sec.  The overall equivalence ratios for all cases are enhanced with the increase in core velocity.  An improvement in stability limits are observed with the increase in coflow velocity.  However, the NO level for two coflow velocities increases with the increase in core flow velocity which is attributed to the fact that the flame gets stabilized at a higher core equivalence ratio. The flue gas CO2 level is enhanced with the increase in core velocity for three different coflow velocities.  The increase in CO2 is mainly due to the combustion of fuel and the subsequent conversion of CO to CO2 in the higher combustion gas temperature. In order to reduce the emission level, the coflow stream is premixed by injecting fuel into the coflow stream with an equivalence ratio even below flammability limits.  The stability limit is found to be improved marginally, when the premixed mixture is used in the coflow stream.  Interestingly, by using premixed fuel-air mixture in the coflow stream, there is a decrease in NO emission levels.  Of course, the use of fuel-air mixtures in the coflow stream enhances the CO2 level.

Stability and Emission in a LPG-Air Premixed Coaxial Jet Flame Burner under a Wide Range of Operating Conditions