Performances Analysis And Improvement Of A Twin Fluid Internal Mixing Nozzles For Industrial Burners

A parametric study on a twin fluid internal mixing burner is presented, that includes the effect of some construction design improvements, the study of its performance curve with single and twin fluid, feed at different flow rate and temperature. Unfired test, performed with air and water as model fluids, are aimed at understanding the nozzle behaviors in terms of mass flows and volumetric coefficient at different feed pressures and pressure ratio of the two fluids, thus helping in tuning up quickly the following fired test. Fired test, with Heavy Fuel Oil and Steam are aimed at understanding the variations and improvements of combustion efficiency and pollutant emissions, when some specific constructive and operative parameters are changed, like the nozzle internal flow and geometry details, the mass flow rate of steam and fuel, the operative temperature, that is the parameters expected to play a major role [1,2,3] in the fuel atomization and subsequent combustion.