基于分形几何理论的隔板塔连续排管式液体调配装置研究
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摘要
在隔板塔中,隔板两侧的液体分配比作为一个十分重要的操作变量,直接影响着隔板塔的效率。以分形几何理论为基础,设计了一种可以安装在隔板塔内的连续排管式液体调配装置。根据简化的修正动量方程计算进液流率Q=0.6 m3/h时的穿孔压强和穿孔速度,通过实验测定,对该装置在不同进液流率工况下进行Klemas分布质量方法评估,利用计算流体力学软件FLUENT对该装置的性能进行了模拟分析,并经实验研究对模拟结果进行验证;对不同阀门偏转角度对液体分配比的影响进行了模拟研究。结果表明:该液体调配装置能够有效地调节液体在隔板两侧的分配,并且液体通过该装置后分布质量较高,成功实现了液体在隔板塔内的分配控制,实验结果和模拟值符合良好;阀片偏转角度在0～50°变化时,该液体分布器对液体的调节作用较明显。
The liquid split ratio is a very important operational variable in DWC column, which directly affects the efficiency of DWC column. A continuous type of the liquid calandria splitter has been proposed based on the fractal geometry theory. The piercing pressure and piercing velocity at the flow rate of Q=0.6 m3/h were calculated according to the simplified revisions momentum equation. Through the experimental determination, the method of Klemas distribution quality was evaluated under different inlet flow rate conditions. The study was carried out by using the computational fluid dynamics(CFD) software FLUENT with k-ε turbulence model and SIMPLE method. The split and the nonuniformity of the liquid were researched and compared against experimental data. The influence of different valve deflection angles on the liquid split ratio was examined by simulation research. Model results and experimental data obtained in this study have revealed that the device can accurately adjust the liquid split and achieve a uniform liquid distribution. The model results were in good agreement with experimental data. When the deflection angle of the valve plate changes from 0° to50°, the device was sensitive with significant changes of liquid split ratio.
The liquid split ratio is a very important operational variable in DWC column, which directly affects the efficiency of DWC column. A continuous type of the liquid calandria splitter has been proposed based on the fractal geometry theory. The piercing pressure and piercing velocity at the flow rate of Q=0.6 m3/h were calculated according to the simplified revisions momentum equation. Through the experimental determination, the method of Klemas distribution quality was evaluated under different inlet flow rate conditions. The study was carried out by using the computational fluid dynamics(CFD) software FLUENT with k-ε turbulence model and SIMPLE method. The split and the nonuniformity of the liquid were researched and compared against experimental data. The influence of different valve deflection angles on the liquid split ratio was examined by simulation research. Model results and experimental data obtained in this study have revealed that the device can accurately adjust the liquid split and achieve a uniform liquid distribution. The model results were in good agreement with experimental data. When the deflection angle of the valve plate changes from 0° to50°, the device was sensitive with significant changes of liquid split ratio.
引文
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[17] Laurent Zuber,Christian Gottlieb Bachmann,Ilja Ausner. Reflux divider for a column having portions for the transfer of material arranged in paral?lel:US,08052845[P]. 2011-11-08.图10阀片偏转角度对液体分配比的影响Fig.10 Effect of valve deflection angle on liquid distribution ratio
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[20] Mandelbrot B B. Fractals:form,chance,and dimension[J]. Physics Today,1979,32(5):65-66.
[21]王昂,刘衎烈,倪炳华,等.多孔管流体流动行为研究[J].化学工程,1992(3):52-57,5.
[22]罗彩霞.排管式液体分布器的设计研究[J].长春理工大学学报(自然科学版),2011,34(3):122-124.
[23]董谊仁,过健.填料塔排管式液体分布器的研究和设计[J].化学工程,1990(3):28-34.
[24] Fair J R,Bravo J L. Distillation columns containing structured packing[J]. Chemical Engineering Progress,1990,86(1):19-29.
[25]王昂,王黎,张士博,等.变孔径直管液体分布器的研究与设计[J].化学工程,1993,21(3):22-29.
[26]林秀锋,陈桂珍.液体分布器分布质量评价体系综述[J].化学工程,2008,36(12):74-78.
[27] Vol N. Accurately assess packed-column efficiency[J]. Chemical Engineering Progress,1995,91(7):27.
[28]董谊仁,裘俊红,陈国标.填料塔液体分布器的设计(续一)──第2讲排管式液体分布器的设计[J].化工生产与技术,1998(2):1-6.
[29] Yang X,Long X,Yao X. Numerical investigation on the mixing process in a steam ejector with different nozzle structures[J]. International Journal of Thermal Sciences,2012,56(2):95-106.
[30] Varga S,Oliveira A C,Diaconu B. Numerical assessment of steam ejector efficiencies using CFD[J]. International Journal of Refrigeration,2009,32(6):1203-1211.
[2] Kiran B,Jana A K. Introducing vapor recompression mechanism in heat-integrated distillation column:Impact of internal energy driven intermediate and bottom reboiler[J]. Aiche Journal,2015,61(1):118-131.
[3]孙兰义,李军,李青松.隔壁塔技术进展[J].现代化工,2008(9):38-41,43.
[4] B?rbel Kolbe,Sascha Wenzel. Novel distillation concepts using one-shell columns[J]. Chemical Engineering and Processing:Process Intensification,2004,43(3):339-346.
[5] Spencer G,Ruiz F J P. Process technology/distillation:Consider dividing wall distillation to separate solvents[J]. Hydrocarbon Processing,2005,84(7):90-94.
[6] Dejanovi?I,Matija?evi?Lj,Oluji??. Dividing wall column—A breakthrough towards sustainable distilling[J]. Chemical Engineering and Process?ing:Process Intensification,2010,49(9):559-580.
[7]王二强.隔板塔内部气液分配装置的研究进展[J].现代化工,2013,33(11):101-103,105.
[8]董谊仁,徐崇嗣.填料塔液体分布器分析[J].化学工程,1996(4):25-32,2.
[9] Hao L,Luyben W L. New control structure for divided-wall columns[J]. Industrial&Engineering Chemistry Research,2009,48(13):6034-6049.
[10] Halvorsen I J,Skogestad S. Optimal operation of Petlyuk distillation:steady-state behavior[J]. Journal of Process Control,1999,9(5):407-424.
[11]袁斌,裘兆蓉.分配比自控器在分隔壁塔中的设计和应用[J].江苏工业学院学报,2005(4):36-38.
[12]汪丹峰.分壁式精馏塔的模拟和实验研究[D].上海:华东理工大学,2011.
[13] Mutalib M I A,Zeglam A O,Smith R. Operation and control of dividing wall distillation columns:part 2:simulation and pilot plant studies using tem?perature control[J]. Chemical Engineering Research&Design,1998,76(3):319-334.
[14] Delgado-Delgado R,Hernandez S,Barroso-Munoz FO,et al. From simulation studies to experimental tests in a reactive dividing wall distillation col?umn[J]. Chem Eng Res Des,2012,90(7):855-862.
[15]朱怀工,王燕,张敏卿.立板式隔板塔分离直馏汽油工艺[J].化工进展,2009,28(8):1337-1342.
[16] Lee B,Kim G,Lee M,et al. Liquid splitter:Korea,10-2010-0120467[P]. 2010-11-30.
[17] Laurent Zuber,Christian Gottlieb Bachmann,Ilja Ausner. Reflux divider for a column having portions for the transfer of material arranged in paral?lel:US,08052845[P]. 2011-11-08.图10阀片偏转角度对液体分配比的影响Fig.10 Effect of valve deflection angle on liquid distribution ratio
[18] Lee B,Kim G. Liquid splitter:Korea,10-2012-0030223[P]. 2012-03-28.
[19] Huaqiang G,Xiangwu C,Nan C,et al. Experimental study on vapour splitter in packed divided wall column[J]. Journal of Chemical Technology&Biotechnology,2016,91(2):449-455.
[20] Mandelbrot B B. Fractals:form,chance,and dimension[J]. Physics Today,1979,32(5):65-66.
[21]王昂,刘衎烈,倪炳华,等.多孔管流体流动行为研究[J].化学工程,1992(3):52-57,5.
[22]罗彩霞.排管式液体分布器的设计研究[J].长春理工大学学报(自然科学版),2011,34(3):122-124.
[23]董谊仁,过健.填料塔排管式液体分布器的研究和设计[J].化学工程,1990(3):28-34.
[24] Fair J R,Bravo J L. Distillation columns containing structured packing[J]. Chemical Engineering Progress,1990,86(1):19-29.
[25]王昂,王黎,张士博,等.变孔径直管液体分布器的研究与设计[J].化学工程,1993,21(3):22-29.
[26]林秀锋,陈桂珍.液体分布器分布质量评价体系综述[J].化学工程,2008,36(12):74-78.
[27] Vol N. Accurately assess packed-column efficiency[J]. Chemical Engineering Progress,1995,91(7):27.
[28]董谊仁,裘俊红,陈国标.填料塔液体分布器的设计(续一)──第2讲排管式液体分布器的设计[J].化工生产与技术,1998(2):1-6.
[29] Yang X,Long X,Yao X. Numerical investigation on the mixing process in a steam ejector with different nozzle structures[J]. International Journal of Thermal Sciences,2012,56(2):95-106.
[30] Varga S,Oliveira A C,Diaconu B. Numerical assessment of steam ejector efficiencies using CFD[J]. International Journal of Refrigeration,2009,32(6):1203-1211.