Investigation On Effect Of Infrared Rare-Earth Mineral Composite Materials On Combustion Of Liquefied Petroleum Gas

Based on the far infrared of tourmaline and the unique characteristic of rare earth, the rare-earth mineral composite materials, which can efficiently emit far infrared rays for acceleration the combustion of liquefied petroleum gas (LPG), were successfully prepared by precipitation method. The relation between the far infrared emitting performance and chemical composition, crystal structure, microstructure and surface free energy of the composite materials was systematically studied in this thesis. The effect of the composite materials on the combustion of LPG was studied by the flue gas analysis and water boiling test (WBT), based on which, the qualitative and quantitative relationship of the far infrared emitting performance of the composite materials with fuel saving and emission reduction was established.It was found by XPS analysis that the addition of rare earth (Ce) led to the improvement of far infrared emissivity of tourmaline from 0.86 to 0.94 due to the decrease of cell volume caused by the oxidation of more Fe2+ ions, which decreased from 1.59255 to 1.54944nm3.The rare-earth mineral composite materials could also led to the change of LPG flame color from red to blue, the improvement of fuel consumption by 7.5%, and the decrease of CO and O2 concentration in exhaust gases by 62.5% and 18.8%, respectively. The improvement of the combustion of LPG caused by the composite materials could be attributed to the acceleration of combustion reaction rate from 6.593×10-6 to 9.361×10-6mol/cm3·sThe model of effect between rare-earth and the tourmaline and the mathematic simulation of far infrared emitting performance of the composite materials were established, through which it was found that the surrounding had a more obvious effect on the composite materials with low emissivity. But as to those with high emissivity, the effect of surrounding became weakened due to their higher activity.