Visualization of structured packing with laser induced fluorescence technique: Two-dimensional measurement of liquid concentration distribution

Abstract

A method of using laser induced fluorescence(LIF)technique was applied to two-dimensional measurement of the liquid concentration distribution in the 250Y structured packing sheet. The experimental structured packing sheet was made of perspex so that the laser could pass through it. The visualization of the distribution of the liquid concentration in the structured packing sheet was realized. The calibration of the thickness and liquid concentration was carried out firstly and the regression formula I=kcd was acquired, in which concentration c and the liquid film thickness d were both considered. Then the liquid feed of uniform tracer(rhodamine)concentration entered the perspex structured packing from the top under different spraying densities. The corresponding thickness of liquid film on the packing was calculated. Finally, tracer(rhodamine)with a high concentration was injected only at one fixed point of the structured packing under different spraying densities of the liquid. With the known liquid film thickness, the concentration distribution of the tracer can be calculated inside the structured packing sheet.

Keywords

LIF / visualization / structured packing / liquid distribution / rhodamine

References

[1] Gualito J J, Rocha J A. Design method for distillation columns filled with metallic, ceramic, or plastic structured packings [J]. Industrial & Engineering Chemistry Research, 1997, 36(5): 1747-1757.

[2] de Paiva J L, Kachan G C. Absorption of nitrogen oxides in aqueous solutions in a structured packing pilot column [J]. Chemical Engineering and Processing, 2003, 43(7): 941-948.

[3] Counce R M, Perona J J. Scrubbing of gaseous nitrogen oxides in packed towers[J]. AIChE Journal, 1983, 29(1): 26-32.

[4] Xu C, Lou J, Jiang Qingquan. Study on the liquid distribution of metal corrugated sheet packing [J]. Journal of Chemical Industry and Engineering, 1986, 37(4): 402-411.

[5] Yuan X, Li Hongyu. Simulation and research for mechanics of liquid flow in metal corrugated sheet packings [J]. Chemical Engineering(China), 1987, 6: 45-54.

[6] Ji J, Dong Y, Xu Congsi. A modified model of liquid distribution in metal corrugated sheet packing[J]. Journal of Chemical Engineering of Chinese Universities, 1995, 9(1): 31-37.

[7] Gu F, Liu C, Yuan X, et al. Liquid distribution model for sheet corrugated structured packing[J]. Journal of Tianjin University(Science and Technology), 2005, 38(7): 586-591.

[8] Chen J, Liu C, Li Y, et al. Experimental investigation of single-phase flow in structured packing by LDV [J]. Chinese Journal of Chemical Engineering, 2007, 15(7): 821-827.

[9] Marchot P, Toye D, Pelsser A M, et al. Liquid distribution images on structured packing by X-ray computed tomography[J]. AIChE Journal, 2001, 47(6): 1471-1476.

[10] Green CW, Farone J, Briley J K, et al. Novel application of X-ray computed tomography: Determination of gas/liquid contact area and liquid holdup in structured packing[J]. Industrial & Engineering Chemistry Research, 2007, 46(17): 5734-5753.

[11] Calvo S, Beugre D, Crine M, et al. Phase distribution measurements in metallic foam packing using X-ray radiography and micro-tomography[J]. Chemical Engineering and Processing, 2009, 48(5): 1030-1039.

[12] Viva A, Aferka S, Toye D, et al. Processing of X-ray tomographic images: A procedure adapted for the analysis of phase distribution in MellapakPlus 752. Y and Katapak-SP packings[J]. Flow Measurement and Instrumentation, 2011, 22(4): 279-290.

[13] Gu F, Liu C, Yu L, et al. The CFD simulation of mass-transfer process in falling film with countercurrent two-phase flow[J]. Journal of Chemical Engineering of Chinese Universities, 2005, 19(4): 438-444.

[14] Sun B, Liu B, Gu F, et al. A new multi-scale model based on CFD and macroscopic calculation for corrugated structured packing column [J]. AIChE Journal, 2013, 59(8): 3119-3130.

[15] Dyer M J, Crosley D R. Two-dimensional imaging of OH laser-induced fluorescence in a flame [J]. Optics Letters, 1982, 7(8): 382-384.

[16] David R U, Fernando J Muzzio. Laser-induced fluorescence technique for the quantification of mixing in impinging jet[J]. AIChE Journal, 1999, 45(12): 2477-2485.

[17] Pan G, Meng Hui. Experimental study of turbulent mixing in a tee mixer using PIV and PLIF[J]. AIChE Journal, 2001, 47(12): 2653-2665.

[18] Lu X, Deng Kangyao. The study of film thickness measurement by laser induced fluorescence [J]. Transactions of CSICE, 2008, 26(1): 92-95.

[19] Hodáková J, Preisler J, Foret F, et al. Sensitive determination of glutathione in biological samples by capillary electrophoresis with green laser-induced fluorescence detection[J]. Journal of Chromatography A, 2015, 1391: 102-108.

[20] Zhang H, Yuan X, Kalbassi M Ali. Laser induced fluorescence technique for measuring liquid distribution in structured packing [J]. CIESC Journal, 2014, 65(9): 3331-3339.

[21] Product-Manual for DAVIS 8. 1[Z]. LaVision GmbH, Göttingen, Germany, 2012.

[22] Huang Z, Li Y, Yu C, et al. Analysis of effects for measurements of concentration in water by laser induced fluorescence(LIF)technique [J]. Journal of Experimental Mechanics, 1994, 9(3): 232-240.

[23] Ding Z, Liu W, Zhang Y, et al. Detection of dissolved organic matter concentration using laserinduced fluorescence technique[J]. Acta Potonica Sinica, 2006, 35(2): 217-220.

[24] Gao M, Lu W, Liu Renyi. Temperature compensation of Hall current sensor based on two-dimensional regression analysis[J]. Journal of Electronic Measurement and Instrument, 2009, 23(2): 100-104.

[25] Lian Y, Guan H, Lei Y, et al. Twodimensional regression analysis of the use of ESP intelligent monitoring and diagnosis system [J]. Journal of Southwest University for Nationalities(Natural Science Edition), 2008, 34(4): 776-778.