Liquid Circulation in a Multi-tube Air-lift Loop Reactor

Abstract

Abstract: A multi-tube air-lift loop reactor (MT-ALR) is presented in this paper. Based on the energy
conserva tion, a mathematical model describing the liquid circulation flow rate was
developed, which was determined by gas velocity, the cross areas of riser and downcomer,
gas hold-up and the local frictional loss coefficient. The experimen tal data indicate that
either increase of gas flow rate or reduction of the downcomer diameter contributes to
higher liquid circulation rate. The correlation between total and the local frictional loss
coefficients was also established. Effects of gas flowrate in two risers and diameter of
downcomer on the liquid circulation rate were examined. The value of total frictional loss
coefficient was measured as a function of the cross area of downcomer and independent of
the gas flow rate. The calculated results of liquid circulation rates agreed well with the
experimental data with an average relative error of 9.6％.

Key words: reactor, air-lift loop reactor, multi-tube, liquid circulation velocity, frictional loss coefficient

摘要： A multi-tube air-lift loop reactor (MT-ALR) is presented in this paper. Based on the energy
conserva tion, a mathematical model describing the liquid circulation flow rate was
developed, which was determined by gas velocity, the cross areas of riser and downcomer,
gas hold-up and the local frictional loss coefficient. The experimen tal data indicate that
either increase of gas flow rate or reduction of the downcomer diameter contributes to
higher liquid circulation rate. The correlation between total and the local frictional loss
coefficients was also established. Effects of gas flowrate in two risers and diameter of
downcomer on the liquid circulation rate were examined. The value of total frictional loss
coefficient was measured as a function of the cross area of downcomer and independent of
the gas flow rate. The calculated results of liquid circulation rates agreed well with the
experimental data with an average relative error of 9.6％.

关键词: reactor;air-lift loop reactor;multi-tube;liquid circulation velocity;frictional loss coefficient

LIU Yongmin, LIU Zheng, MU Ke, YUAN Naiju. Liquid Circulation in a Multi-tube Air-lift Loop Reactor[J]. .

刘永民, 刘铮, 穆克, 袁乃驹. 多管气升式环流反应器的液体循环[J]. CIESC Journal.

References

[1] Chisti, M. P., Moo-Young, M., “Airlift reactor: charactreistics, applications and
design considerations”, Chem. Eng.Comm., 60, 195 (1987).
[2] Bakker, W. A. M., van Can, H. J. L., Tramper, J., de Gooijer, C. D., “Hydrodynamics
and mixing in a multiple air-liftloop reactor”, Biotechonol. Bioeng., 42, 994 (1993).
[3] Gasner, L. L., “Development and application of the thinchannel rectangular air lift
mass transfer reactor to fermen-tation and waste-water treatment systems”,
Biotechonol.Bioeng., 16, 1179 (1974).
[4] Margaritis, A., Sheppard, J. D., “Mixing time and oxygentransfer characteristics of a
double draft tube fermentor”,Biotechnol. Bioeng., 23, 2117 (1981).
[5] Liu, Y. M., Hu, H., Ding, F. X., Yuan, N. J., “Experimental study on flow behavior of
a multi-compartment airliftloop reactor”, Acta Petrolei Sinica (Petroleum
ProcessingSection ) (in Chinese), 12, 73 (1996).
[6] Orazem, M. E., Fan, L. T., Erickson, L. E., “Bubble flow inthe downfiow section of an
airlift tower”, Biotechnol. Bioeng., 21, 1579 (1979).
[7] Kawas, Y., Moo-Young, M., “Mathematical model for turbulence”, Chem. Eng J., 43, B19
(1987).
[8] Liu, Y. M., Sun, G. D., Yuan, N. J., “Experimental studyof gas holdup in a multi-tube
airlift loop reactor”, ChemicalEngineering (in Chinese), 26 (2), 23 (1998).
[9] Joshi, J. B., Sharma. M. M., “A circulation model for buble columns with Newtonian and
non-Newtonian fluids”,Trans. Inst. Chem. Eng., 57, 244 (1979).
[10] Lehrer, I. H., “Gas agitation of liquids”, Ind. Eng. Chem.Proc. Des. Dev., 7, 226
(1986).
[11] Wallis, G. B., One Dimensional Two Phase Flow, McGrawHill, New York (1969).
[12] Verlaan, P., Tramper, J., Van’t Riet, K., “A hydroynamicmodel for an airlift loop
bioreactor with externall loop”,Chem. Eng. J., 33, B43 (1986).
[13] Bello, R. A., Robinson, C. W., Moo-Young, M., “Liquidcirculation and Mixing
characteristics of airlift contactor”,Can. J. Chem. Eng., 62, 573 (1984).
[14] Garcia Calvo, E., “A fluid dynamic model for airlift loopreactors”, Chem. Eng. Sci.,
44, 321 (1989).

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