Experimental Study on the Effect of Different Gasoil-natural Gas Synchronous Combustion Ratio on Flame Structure and Heat Transfer Properties

In industrial natural gas burner, due to high temperature of flame, radiation is the most important mode of heat transfer and a main portion of heat must be transferred via radiation. However, the natural gas burner does not have suitable thermal efficiency, which leads to several commercial and qualitative problem. In the present study, the impact of different synchronous combustion ratio of gasoil-natural gas on flame structure and heat transfer was investigated. The structural and outward flame properties were determined by photography and processing technique. Also, a Solar Power Meter and calibrated thermopile were used to determine the luminous radiation and the total radiation of flame, respectively. Due to the important role of soot particles in flame radiation, the combination of yellow and red chemiluminescence and IR photography of flame were employed to determine the qualitative distribution of soot particles in flame. Also, the spectral radiative characteristics of soot particles were measured by BOMEM FTIR. The result indicated that synchronous combustion of gasoil droplets into natural gas create a volume flame with uniform temperature and enhance the radiation and thermal efficiency of flame. Increase in synchronous combustion from 0 to 35%, rises the average temperature of flame from 735 K to 1088 K and enhance the radiation heat transfer and thermal efficiency 1.55 and 2.35 times greater than pure natural gas, respectively.