立体旋流筛板并、逆流操作时压降的对比研究
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摘要
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≤550 Pa。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≤300 Pa。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.
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.
引文
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[8] 王丽瑶,唐猛,张少峰,等.立体旋流筛板并流时的流型特征及其操作域[J].化学工程,2017,45(12):21-25.
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[12] STOCKFLETH R,BRUNNER G.Holdup,pressure drop,and flooding in packed countercurrent columns for the gas extraction[J].Industrial & Engineering Chemistry Research,2001,40(1):347-356.
[13] BILLET R,SCHULTES M.Fluid dynamics and mass transfer in the total capacity range of packed columns up to the flood point[J].Chemical Engineering & Technology,1995,18(6):371-379.
[2] MAYER D F,FERIS L A,MARCILIO N R,et al.Review of hydraulics correlations for sieve trays without downcomers[J].Industrial & Engineering Chemistry Research,2014,53(20):8323-8331.
[3] 高燕如,刘永刚,黄洁.新型淋降式穿流塔板的应用[J].氮肥技术,2013,34(4):70-72.
[4] 李卫娟,王晋刚,陈建民,等.立体旋液式并流塔板压降试验研究[J].河北工业大学学报,2011,40(4):26-28.
[5] 荆瑞静,王晋刚,张少峰.立体旋液式并流塔板的海水脱硫特性[J].化工学报,2012,63(8):2477-2481.
[6] 唐猛,张少峰,孙双双,等.双效并流立体旋液式塔板压降的实验研究[J].化学工程,2015,43(6):19-24.
[7] 王娜,张少峰,王德武,等.立体旋流筛板空间气相流场的CFD模拟[J].化学工程,2017,45(2):33-38.
[8] 王丽瑶,唐猛,张少峰,等.立体旋流筛板并流时的流型特征及其操作域[J].化学工程,2017,45(12):21-25.
[9] SHI W,HUANG W,ZHOU Y,et al.Hydrodynamics and pressure loss of concurrent gas-liquid downward flow through sieve plate packing[J].Chemical Engineering Science,2016,143(1):206-215.
[10] LARACHI F,BELFARES L,ILIUTA I,et al.Heat and mass transfer in cocurrent gas-liquid packed beds.Analysis,recommendations,and new correlations[J].Industrial & Engineering Chemistry Research,2003,42(1):222-242.
[11] 张峰,金伟娅,方志明,等.填料塔液泛性能的研究现状与发展趋势[J].轻工机械,2012,30(5):104-107.
[12] STOCKFLETH R,BRUNNER G.Holdup,pressure drop,and flooding in packed countercurrent columns for the gas extraction[J].Industrial & Engineering Chemistry Research,2001,40(1):347-356.
[13] BILLET R,SCHULTES M.Fluid dynamics and mass transfer in the total capacity range of packed columns up to the flood point[J].Chemical Engineering & Technology,1995,18(6):371-379.