【摘要】 本文运用Fluent软件,分析了生物质旋风热解炉气相等温流场。研究结果表明,RSM模型最适合生物质旋风热解炉气相等温流场的模拟。与RSM模型相比,RNGk-ε模型相差最大10%,标准k-ε模型和k-ω模型相差最大50%,DES模型则在整体趋势上不符。双对称入口改善了流场的轴对称性,斜切入口能够极大地减小旋风热解炉内的局部涡流。综合考虑短路流、切向速度、轴向速度、停留时间,旋风热解炉入口采用双对称30°倾角、排气管不插入旋风筒的形式。更多还原

【Abstract】 This paper analyzes the gas- phase isothermal flow field of a biomass cyclone pyrolysis burner with the Fluent software. The results show that RSM is the best suitable turbulence model for simulating the gas- phase isothermal flow field of a biomass cyclone pyrolysis burner. Compared with the RSM,the maximum difference of RNG k- εis 10%,the maximum difference of standard k- ε and k- ω is 50%.DES does not match the overall trends above. The form of double symmetrical inlet improves the axial symmetry of the biomass cyclone pyrolysis burner. The inlet with oblique angles greatly reduces the internal local vortex. The short volume is very small when the inlet section angle is over 25°. When the inlet section angle is 25°,the tangential velocity reaches maximum,when the inlet section angle is 45°,the axial velocity reaches maximum. Considering the short- circuit flow,tangential velocity,axial velocity and particle retention time synthetically,a double symmertical inlet with the inlet section angle of 30° and an exhaust pipe without stretching into the cyclone are adopted for the biomass cyclone pyrolysis burner.更多还原