基于多孔介质模型的低质燃气燃烧排放特性数值模拟

Numerical simulation of low-quality gas emission characteristics based on porous medium model

为了研究多孔介质体应用于锅炉设备中的燃烧排放特性,根据多孔介质燃烧理论,建立了甲烷/二氧化碳(1∶4)预混低质燃气在2.8 MW的热水锅炉中燃烧的单步反应模型。通过Fluent软件进行数值模拟,对比分析了多孔介质体的材料、安装位置及孔隙率对燃烧特性的影响,得出了燃烧温度分布以及燃烧排放物分布变化云图。研究结果表明,多孔介质材料选为碳化硅、孔隙率选为0.5、多孔介质体安装在800mm处,更有利于锅炉的燃烧。

In porous media body applied to boiler equipment in order to study the combustion characteristic, based on the theory of porous media combustion, methane/Carbon dioxide premixed gas （1 ： 4） was established in 2.8 MW hot water boiler combustion of single step reaction model, through the numerical simulation, comparison and analysis of the porous medium body materials, location, and the influence of porosity on the combustion characteristic, it is concluded that the combustion temperature distribution, combustion emissions cloud distribution change. Results show that the porous medium material is silicon carbide, choose 0.5 and porosity of porous media is installed on 800 mm, is more advantageous to the boiler combustion.