Combustion Model And Experimental Research On Flame Characteristic Of Biodiesel

As a utilization form of biomass, biodiesel is a huge marketing potential, energy saving, environmental protection, etc. Biodiesel has huge potential application in the field of industrial furnaces and research. It is significant to the biodiesel used in industrialized researching the combustion flame characteristics.The characteristic of biodiesel was seted up combustion mathematical model based on element, chemical equilibrium and energy equilibrium. The law of combustion product components were analysed under the theoretical combustion temperature. The results show that:1) When the combustion air temperature was20℃, as the excess air coefficient n increased, the mole fraction of CO, H2O gradually decreased, while the mole fraction of O2increased. The mole fraction of O, H, OH and H2were in the order of10-6or less, and gradually decreased with the increase of the excess air coefficient n.2) Improved the combustion air temperature, the mole fractions of combustion product were little changed.The flame characteristics of biodiesel burning in the small furnace were studied, the temperature and concentration fields were contained. The results show that:1) The temperature of the flame located axes was lower than others which biodiesel was applied to the swirl burner. In the radial direction, the flame was tendency to rise as a whole. When the excess air coefficient n changed from1to1.15, as n increased, the high temperature zone of flame was gradually shorter and close to touch the burner spout. When the combustion air temperature was500℃, the high temperature zone of flame was more and more concentrated. When the combustion air temperature increased, the temperature of the flame increased overall, and the high temperature area became large.2) NO concentration increased along the direction of flame. NO concentration on the flame U1, D1was higher than that on O, and the fluctuation was not big. Along the direction of flame the CO2volume concentration increased gradually as the distance of the location of the burner, reached the peak and then slowed down.3) NO, CO2concentration distribution and temperature distribution in the flame had high similarity. When the temperature exceeded above850℃, prompt NO contributed to total NO from stationary combustors was bigger. More than950℃, the thermal NO mechanism played the leading role.