摘要
为了改进优化旋风复合除尘器筒体结构,采用FLUENT软件提供的RNG k-ε湍流模型及DPM离散相模型对两种旋风除尘器流场进行数值模拟,对比研究粒子运动轨迹和流场速度、压力的分布规律,结果表明:直流式除尘器压力损失较低但流场相对混乱,中心低压区易生成次流;返流式除尘器通过锥体结构压缩流场使其均匀稳定,但内外旋流交界处湍度较高,能量损耗大。基于模拟结果提出了一种新型绕流式旋风除尘器,通过在直流筒体内部设置一段直径30cm圆柱填补低压区同时压缩流场空间,提高了旋流场均匀稳定性,有效解决了区域次流及内外旋强湍等问题,压力损失减少了60.75Pa,空间充足,适合其他降尘设备安装,也可为相关复合除尘器优化设计提供参考。
In order to improve and optimize the cylinder structure of cyclone composite separator,RNG k-εturbulence model and DPM discrete phase model provided by FLUENT software were used to simulate the flow field of two cyclone separators numerically,and the particle motion trajectory,velocity and pressure distribution of the flow field were compared and studied.The results show that the pressure loss of direct-flow cyclone separator is relatively low,while the flow field is relatively chaotic,and secondary flow is easily generated in the low-pressure central area.The flow field of the return-flow cyclone separator compressed by the cone structure is well-distributed and stable,with strong turbulence development and high energy loss in the boundary of the inner and outer cyclone flow.Based on the simulation results,a new circumfluence cyclone separator is proposed.A solid cylinder with 30 cm diameter is set inside the direct-flow cyclone separator to fill the low pressure area and compress flow field space.The new circumfluence cyclone separator can improve the rotary flow field uniform stability,effectively solve the problems of central area secondary flow and strong turbulence between inner and outer cyclone.The pressure loss is reduced by 60.75 Pa,and sufficient space is reserved for the installation of other dedusting equipment.This paper can provide a reference for the optimization design of relevant composite filter.
作者
肖玉博
邬长福
陈祖云
XIAO Yubo;WU Changfu;CHEN Zuyun(School of Resource and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China)
出处
《矿业研究与开发》
CAS
北大核心
2020年第7期135-139,共5页
Mining Research and Development
基金
国家自然科学基金项目(51864016,51464016)。
关键词
旋风除尘器
数值模拟
改进优化
绕流式除尘器
Cyclone separator
Numerical simulation
Improvement and optimization
Circumfluence cyclone separator
