立体旋流筛板并流时的流型特征及其操作域

发布时间：2018-05-07 11:09

本文选题：立体旋流筛板 + 差压脉动　；参考：《化学工程》2017年12期

【摘要】：流型影响气液通过塔板时传热传质效率,为了确定立体旋流筛板上不同喷淋密度Lw,空塔气相动能因子Fs的流型及其操作域,采用安装立体旋流筛板内构件的冷模实验塔,在Lw=39—260 m~3/(m~2·h),Fs=0.78—3.9(m/s)(kg/m~3)~(0.5)的操作条件下,测量立体旋流筛板内部差压脉动信号并记录流动照片。使用时域及标准偏差分析并结合流动图片的方法,主要考察了气液并流通过立体旋流筛板的流型特征及其操作域。实验结果表明:液相通量对各流型转变影响较大,Lw70 m~3/(m~2·h)时为连续-分层流,Lw=70—145 m~3/(m~2·h)之间时为鼓泡-分层流或栓塞流,Lw145 m~3/(m~2·h)为泡沫流;当Lw=70—145 m~3/(m~2·h)时,鼓泡-分层流和栓塞流的转变主要受气相通量Fs影响,Fs1.95(m/s)(kg/m~3)~(0.5)为鼓泡-分层流,Fs2.34(m/s)(kg/m~3)~(0.5)为栓塞流。
[Abstract]:The flow pattern affects the heat and mass transfer efficiency when the gas and liquid flow through the tray. In order to determine the flow pattern and operation area of different spray density LW and gas kinetic energy factor Fs on the three-dimensional swirl sieve plate, the cold mold experimental tower with the inner components of the three-dimensional swirling sieve plate is adopted. The differential pressure pulsation signals in the three-dimensional swirl sieve plate were measured and the flow photographs were recorded under the operating conditions of Lw=39-260 m~3/(m~2 FSX 0.78-3.9m / s / kg / m ~ (3 / 3). Using time-domain and standard deviation analysis and flow picture method, the flow pattern characteristics and operation field of gas-liquid parallel flow through a three-dimensional swirl sieve plate are investigated. The experimental results show that when the liquid flux has a great influence on the flow pattern transition, it is a bubble-laminated flow or an embolized flow between the continuous and stratified flows (Lw70 m~3/(m~2 h), and when the flow is Lw=70-145 m~3/(m~2 h, it is a foam flow. The changes of bubble-stratified flow and embolized flow were mainly affected by gas flux Fs (Fs1.95 m / s / kg 路kg / m ~ (3 +), respectively. The embolization flow was composed of bubble-stratified flow (FS _ (2.34) m 路s ~ (-1) / kg 路m ~ (3).
【作者单位】：河北工业大学化工学院;
【基金】：国家自然科学基金资助项目(21776055) 河北省科技计划项目(14273105D) 河北省自然科学基金资助项目(D2014202074) 河北省研究生创新资助项目(CXZZBS2017030)
【分类号】：TQ053.5

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