管式搅拌反应器中流动特性实验及模型研究  

Experimental and model study on flow characteristics in a tubular reactor with stirrer

作　　者：赵秋月[1] 张廷安[1] 曹晓畅[1] 蒋孝丽[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《化学工程》2007年第9期25-28,共4页Chemical Engineering(China)

基　　金：辽宁省青年人才基金(2005221012);教育部高校博士点专项基金(20050145029)

摘　　要：为进一步研究带机械搅拌装置的新型管式反应器内流动特性,采用刺激-响应技术,测定流体在不同操作条件下的停留时间分布(RTD)曲线并与无搅拌停留时间分布曲线作对比,计算了平均停留时间分布的统计特征值。用混合时间表征混合特性,用Peclet操作准数表征轴向扩散特性。结果表明,适当增大转速、流量或降低水位,都有利于反应器内流体的均匀混合。大体上随流量的减少和液位的升高停留时间有延长的趋势,转速变化对停留时间的影响不显著。在搅拌转速不超过400 r/min时,混合时间随着搅拌转速的增大而缩短。在实验范围内,反应器相当于3个串联全混槽反应器。To study the flow pattern in a tubular stirred reactor, the RTD curves were investigated under different operating conditions by pulse stimulus-response technique. According to the experimental results, the mean residence time and other statistical eigen values were calculated. Three RTD curves without stirring were also determined. Peclet number （Pe） and mixing time （tm ） represent axial dispersion behavior and mixing behavior, respectively. The results show that it＇s benefit to well mixing by properly increasing the flux, rotation speed or decreasing the water level. Reducing flux and raising water level are both useful for prolonging the residence time, but the rotation speed has no significant impact on it. When the rotation speed is below 400 r/min, the mixing time shortens with the increasing of rotation speed. In the experimental range, the reactor is equivalent to three backflow cells in series.

关 键 词：管式反应器 停留时间分布 方差 混合时间 轴向扩散 

分 类 号：TQ021[化学工程]