Lin Riyi, Li Wei, Li Huanan, Liu Xinxin, He Jitao, Wang Xinwei
College of New Energy, China University of Petroleum (East China), Qingdao 266580, P. R. China.
Shengli Oilfield Technical Inspection Center, SlNOPEC, Dongying 257000, P. R. China.
ACS Omega. 2024 Jul 10;9(29):31384-31392. doi: 10.1021/acsomega.3c10444. eCollection 2024 Jul 23.
Porous media combustion has the advantages of high combustion efficiency and low pollutant emissions. However, there are few studies on the combustion characteristics and pollutant emissions of high-power porous media combustion chambers and fire tubes. Based on the computational fluid dynamics method, the stable combustion characteristics and pollutant emission rules of methane-air were explored in a high-power porous media combustion chamber of 800-1200 kW. The results show that the combustion of the porous media combustor is stabilized at an inlet velocity of 0.8-1.6 m/s with an equivalence ratio of Φ = 0.5-0.9. The high-power porous medium combustor has the highest limiting temperature at Φ = 0.7. Temperature increases gradually with increasing porosity within the -2.5 to 1 m axial center interval. The outlet radial temperature distribution tends to be uniform with the increase of porosity, and the outlet temperature is highest for porous media with a thickness of 400 mm. NO emission was lowest at an inlet velocity of 1.2 m/s. A significant reduction in NO emissions was observed with increasing equivalence ratio. NO generation increases with increasing porosity at porosities between 0.75 and 0.85. NO generation increases with the thickness of the porous media and increases sharply at 600 mm. The results above can provide guidelines for the design of a high-efficiency high-power porous combustor.
多孔介质燃烧具有燃烧效率高和污染物排放低的优点。然而，关于大功率多孔介质燃烧室和火管的燃烧特性及污染物排放的研究较少。基于计算流体动力学方法，在800 - 1200kW的大功率多孔介质燃烧室内探索了甲烷 - 空气的稳定燃烧特性和污染物排放规律。结果表明，多孔介质燃烧器在入口速度为0.8 - 1.6m/s、当量比Φ = 0.5 - 0.9时燃烧稳定。大功率多孔介质燃烧器在Φ = 0.7时极限温度最高。在轴向中心 - 2.5至1m区间内，温度随孔隙率增加而逐渐升高。随着孔隙率增加，出口径向温度分布趋于均匀，对于厚度为400mm的多孔介质，出口温度最高。在入口速度为1.2m/s时，NO排放最低。随着当量比增加，NO排放显著降低。在孔隙率为0.75至0.85之间，NO生成量随孔隙率增加而增加。NO生成量随多孔介质厚度增加而增加，并在600mm时急剧增加。上述结果可为高效大功率多孔燃烧器的设计提供指导。
