An Efficient Porous Burner Design And Its Combustion Numerical Simulation

Our energy-use exists some current situation like inefficience, pollution, waste and other serious problems. On the other hand, a lot of low-grade energy has not been developed and utilized. Such as low-density gas, which is difficult to use safe and in effect on conventional combustion equipment. It would cause environmental pollution and energy waste directly let out to the atmosphere. Energy conservation, using energy rationally and efficiently, is an important strategic issue of long-term development to achieve economic growth and environmental protection. Therefore, saving energy and reducing environmental pollution has prompted many new combustion technologies, inwhich the porous media combustion technology nanifested superior features and broad application prospects.Porous media material has strong ability of dielectric regenerative, perfect heat conduction and radiation, safe, stable, explosion-proof and many other advantages.In porous media combustion system, the porous media material transport heat in the way of the solid thermal and radiation heat transportation through solid combustion reaction zone, and then large amount of heat supplied to the front region of the reaction zone, efficiently preheating unburnt gas. So compared to conventional burners, the gaseous fuel can achieve full combustion better, improving the combustion efficiency, expanding the lean burn limit.What’s more, a very low volume fraction (less than 35%) of the combustible gas in the porous media material nay burn, but lower emissions. In recent years, it has aroused great attention of combustion and thermal physics engineering sector domestic and abroad.In this article, firstly contrast preferred combustion simulation software to select FLUENT software as porous burner simulation software. Secondly, in order to burn more components, research is carried out on the structure improvements of the two-stage burner porous media currently used in industrial applications based on the analysis of basic law gas combustion mechanism of CH4/air premixed gas combustion in a porous medium, combined with the status quo of porous media combustion experiments and numerical simulation domestic and abroad, to strengthen the action the turner to preheat premixed gaseous fuel. In the end, contrast the performance of new burners and burner before improved combustion in different equivalence ratios and inlet velocity, conduct lean fuel combustion simulation, concern flame surface migration law, and examine NOx emissions as major pollutants of the new burner. What’s more, the article also examines the effects of different physical properties of porous dielectric material on the combustion parameters by means of numerical simulation. Study was that the improved new burner can achieve the purposes as greater heat, saving fuel, expanding lean-burn gas limit. Arrange porous dielectric material with a reasonable choice, you can improve the combustion efficiency further. The research and development provide a new way of thinking and direction to industrial application of porous media combustion.