CO2 -水系统填料床吸收塔传质与流体力学的实验与模型研究

Dario Balaban, Branislava Nikolovski, M. Perusic, G. Tadic
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摘要

本文研究了填料吸收塔的流体力学和传质问题。在实验室规模的拉希环填充吸收塔上获得了干柱压降、水淹点和吸收水中CO2效率的实验数据。设备的辅助部件和化学分析提供了简单的监测和数据收集。所有获得的数据都用于测试给定问题的不同数学模型,即确定干塔压降、注水点和总气传单元高度。对于干塔压降,主要为填充塔开发的模型描述数据最好,其中Billet模型产生6.54%的平均误差,其次是Mackowiak和stichlair模型。在洪水点计算中,对经验模型进行了检验,Lobo、Leva和Takahshi模型的计算结果最好。传质(吸收)实验得到了预期的结果,因为吸收效率随着液/气流速比的增加而增加,即随着接近驱油点而增加。昂达吗?采用S模型计算液、气两相的部分传质系数,以此估算整体传质单元的高度,并与实验数据进行比较。整体换气装置高度计算结果与实验结果的偏差在0 ~ 20%的预期范围内,平均值为15.5%。综上所述,用于确定填料吸收柱中流体力学和传质参数的现有模型与实验值相比给出了足够的结果。
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Experimental and modeling studies of mass transfer and hydrodynamics in a packed bed absorption column for CO2 - water system
This paper presents research on hydrodynamics and mass transfer in a packed absorption column. Experimental data on dry column pressure drop, flooding point, and efficiency of absorption of CO2 in water is obtained on a lab-scale absorption column packed with Raschig rings. Auxiliary parts of equipment together with chemical analyses provide simple monitoring and collecting the data. All obtained data were used to test different mathematical models for a given problem, i.e. for determination of the dry column pressure drop, flooding point and the overall gas transfer unit height. For dry column pressure drop, models developed primarily for packed columns described the data the best, with the Billet model generating a 6.54 % mean error, followed by Mackowiak and Stichlmair models. In flooding point calculations, empirical models were tested and models of Lobo, Leva and Takahshi gave the best results. Mass transfer (absorption) experiments gave expected results, since absorption efficiency increased with the increase in the liquid/gas flow rate ratio, i.e. with approaching the flooding point. The Onda?s model was used to calculate partial mass transfer coefficients in liquid and gas phases based on which the height of the overall gas transfer unit was estimated and subsequently compared with the experimental data. Deviation of calculated and experimental results for the height of the overall gas transfer unit is in the expected range of 0-20 %, with mean value of 15.5 %. In conclusion, the available models for determination of the investigated hydrodynamics and mass transfer parameters in packed absorption columns gave adequate results in comparison to the experimental values.
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