Compartmental Modeling of an Industrial Column

Abstract

). It leads to the necessity to set a complex system to recycle the CO 2 downstream the columns. Nevertheless, an important amount of CO 2 is emitted to the atmosphere. Furthermore, the CO 2 is produced by lime calcination. This process requires a large amount of energy. It represents the major part of the energy consumption of the entire process.Accordingly, Solvay is seeking a more fundamental approach. The objective of this work is the development of an operational BIR column model, taking into account all the phenomena taking place in it, using a compartmental modeling approach. Notice that the goal of this paper is not to provide a final validated model. That will be realized in a further work, based upon the results of this work.The structure of the model is developed in section 2.1 following the approach proposed by Haut et al. (2004). This structure is based on the analysis of experimental measurements realized on an industrial column located in Dombasle (France) by Hirschauer (2001). This model will be used to understand the complex interactions between the different phenomena taking place in the columns and to optimize the NaHCO 3 crystal quality and the CO 2 transfer rate in the columns.The gaseous phase is modeled in section 2.2 using the approach developed by Haut and Cartage (2005). The bubble-liquid CO 2 transfer rate is quantified by an expression validated for the BIR columns by Wylock et al. (2008a) and presented in section 2.3. The solid phase is modeled by a classical Population Balance Equation (PBE) (Randolph and Larson, 1971). The concentrations of the dissolved species are calculated using balance equations as presented in section 2.4.All the parameters appearing in the model can be estimated, at least roughly. They are estimated from data or correlations found in the literature, from theoretical and experimental studies or from the analysis of the measurements performed by Hirschauer (2001) on a column located in Dombasle.Using the estimated parameters, a classical operating point of a column located in Dombasle is simulated. The results of this simulation are in good agreement with experimental measurements.Moreover, a parametric sensitivity analysis of the model is performed. This analysis allows identifying which parameters have a strong influence on the model behaviour, in order to direct further studies that have to be realized to improve the model.Finally, some modeling perspectives are proposed.

Influence of structural descriptions of underbody of bicarbonate columns on duration of period of their operation and ecologization of process

“…It is to ensure longitudinal mixing by the author [7] that the use of a circulation loop in the column was proposed.…”

“…Apparatus with external energy input (apparatus with stirrers, rotary apparatus, apparatus with static mixing devices) have also been widely used in industry for carrying out mass transfer processes in liquid-gas-solid phase systems. In the processes of production of purified sodium bicarbonate, the intensity of stirring plays a very significant role: firstly, it causes the transfer of small crystals to the upper part of the column, where they play the role of crystallization centers; secondly, intensive stirring prevents the deposition of sodium bicarbonate both on the trays and in the bottom of the column [7,8].…”

Auslegung von Blasensäulen mithilfe von Compartmentmodellen

“…Zur geometrischen Einteilung der Blasensäule in Compartments können die Installationshöhen von Einbauten innerhalb der Blasensäule wie z. B. Umlaufbleche oder Leitrohre , genutzt werden. Folgende Beispiele aus der Literatur zeigen, dass die Einteilung der Compartments ebenso anhand verschiedener fluiddynamischer Kriterien, wie der Strömungsrichtung, ‐geschwindigkeit oder Blasengröße, erfolgen kann.…”

Analysis of the influence of technological parameters of soda-bircarbonate solution carbonization in the production of refined sodium bicarbonate on CO2 absorption

“…Реакції 2 та 4 утворюють пересичення NaHCO 3 в рідині, сприяючи тривалому осадженню твердого NaHCO 3 в нижній частині колони [2].…”