立体旋流筛板并、逆流操作时压降的对比研究

Comparison of pressure drops of the tridimensional rotational flow sieve tray under gas-liquid concurrent flow and countercurrent flow conditions

立体旋流筛板(TRST)是一种新式穿流型塔板。前期研究均基于气液并流的操作形式,而逆流时的表现尚不明确。因此文章对TRST在并、逆流操作下的压降进行了对比研究,考察不同气液通量、塔板安装位置及安装方式对压降的影响,并测定了逆流操作下的载点及泛点。结果表明:2种操作下,塔板逆向安装时的压降均大于顺向安装;并流时各塔板气液负荷均衡,压降值≤550Pa。逆流时可将操作域分为低负载区及高负载区。低负载区压降与同范围并流操作时相近;高负载区压降较大,操作域较窄且各板气液负荷不均。受限于液泛的影响,逆流操作时的压降值≤300Pa。相较于并流操作,逆流操作时气量调节范围至少小45%,液量范围至少小37.5%。综合考虑,TRST更适宜并流操作。

Tridimensional rotational flow sieve tray(TRST)is a novel dual-flow type tray.Previous studies of the tray focused on the operating conditions of the gas-liquid concurrent flow.The performance of the tray under the countercurrent flow condition was not clear.Therefore,the comparisons of pressure drops of the TRST under concurrent flow and countercurrent flow conditions were investigated experimentally in this paper.The effect of different gas-liquid flux,tray installed locations and tray installation methods on the pressure drops was also examined,and the loading and flooding point under the countercurrent flow condition were measured.The results show that the pressure drops of the tray in the backward installation are larger than that in the forward installation under both of two conditions.Under the concurrent flow condition,the gas-liquid loads of each tray are balanced,and the pressure drops are within 550 Pa.Under the countercurrent flow condition,the operating region can be divided into the low and high loading areas.The pressure drops in the low loading area are similar to that with concurrent operating.While the pressure drops are larger in the high loading area,the region range is narrow and the gas-liquid loads are unbalanced.Due to the influence of the flooding,the pressure drops are less than 300 Pa.Compared with concurrent flow,gas flux range in countercurrent operation is at least 45%less and the liquid flux is at least 37.5%less.Overall,the TRST is more suitable for the concurrent operation.