生物质旋风热解炉气相等温流场数值模拟  

Numerical Simulation for the Gas- phase Isothermal Flow Field of a Biomass Cyclone Pyrolysis Burner

作　　者：张玉[1] 翟明[1] 张波[1] 董芃[1] 朱群益[1] 邹洪顺 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001 [2]沈阳前进锅炉厂,辽宁沈阳110141

出　　处：《节能技术》2015年第5期413-419,共7页Energy Conservation Technology

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。This paper analyzes the gas - phase isothermal flow field of a biomass cyclone pyrolysis burnerwith the Fluent software. The results show that RSM is the best suitable turbulence model for simulatingthe gas - phase isothermal flow field of a biomass cyclone pyrolysis burner. Compared with the RSM, themaximum difference of RNG k - 6is 10%, the maximum difference of standard k - 8 and k - to is 50%.DES does not match the overall trends above. The form of double symmetrical inlet improves the axialsymmetry of the biomass cyclone pyrolysis burner. The inlet with oblique angles greatly reduces the inter-nal local vortex. The short volume is very small when the inlet section angle is over 25°. When the inletsection angle is 25°, the tangential velocity reaches maximum, when the inlet section angle is 45°, theaxial velocity reaches maximum. Considering the short - circuit flow, tangential velocity, axial velocityand particle retention time synthetically, a double symmertical inlet with the inlet section angle of 30° andan exhaust pipe without stretching into the cyclone are adopted for the biomass cyclone pyrolysis burner.

关 键 词：旋风热解炉 气相等温流场 湍流模型 双对称入口结构 入口截面角 数值模拟 

分 类 号：TK229.65[动力工程及工程热物理—动力机械及工程]