High fidelity model of the oxygen flux across ion transport membrane reactor: Mechanism characterization using experimental data
Section snippets
Membrane technology
The integration of gas separation membranes in energy systems has been actively investigated in recent years [1], [2], [3], [4], thanks to the possibility of providing novel plant configurations and achieving higher performances at lower cost [5]. One of the most important application for membranes is in the reduction of greenhouse gas emissions. Extensive use of fossil fuels has been responsible of the emission of huge quantities of CO2 and different technologies are under investigation,
ITM structure
In this work, attention is focused on a particular class of oxygen separation membranes, namely the high temperature mixed-conducting ceramic membranes. Dense perovskite ion transport membranes (ITM) produce a flux of pure oxygen, based on the difference between partial pressures of oxygen on the two sides which can be used for several applications [27]. This type of dense membranes, at high temperature, allows oxygen ion to pass through the crystal lattice. Oxygen permeation through a dense
Geometry structure
First step in the development of the membrane module is the definition of the reactor geometry, which affects the ITM performance. The surface area to volume ratio (s/v) is defined by the structural characteristic of the reactor, and affects both the thermal and the fluid-dynamic problem. A low value of s/v corresponds to higher pressure drop and bigger reactor. As has been shown previously [26], both the pressure drop and the temperature profile affect the oxygen flux, so geometry optimization
Methodology
The membrane model is written in Aspen Custom Modeler®, which is an Aspen Product. ACM allows the creation of rigorous model for process equipment, using an easy language. The model can be also exported to Aspen Plus® or simply linked with Excel. In this way, it is possible to integrate the reactor model with other components. Most membrane models are implemented in Matlab®. Using Matlab® is not possible for modeling the entire system, in which the membrane is integrated, unless a Matlab® model
Experimental data and flux model
In this part, the validation and assessment of the membrane model are conducted. As already presented in Ref. [26], the MIT-RGD group has characterized the behavior of LCF membranes. Using an experimental apparatus, they measure the oxygen flux of LCF oxygen permeable membranes under different thermodynamic conditions. Given that the main objective behind developing a reactor model is estimating its thermodynamic performances, and finding the optimal conditions under which the component should
Conclusions
This paper focuses on the characterization of the membrane reactor. The physical and chemical mechanism of the permeation across a dense membrane has been described. The high fidelity model provides an accurate simulation for the integration of the membrane reactor with the energy plant. The paper extends previous works using detailed analysis and an experimental validation. The application of the model will be presented in the future work, where for example the integration of this membrane
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2020, Chemical Engineering JournalCitation Excerpt :The development of these models allows the conduction of advanced studies by using computational techniques for higher analysis of the O2 permeation process. On one side, commercial process simulation software such as Aspen Plus permits the evaluation of the process viability [9,27–34]. On the other side, Computational Fluid Dynamics (CFD) has been utilized as strong visualization tool to simulate the effects of reactions in membrane reactors and gas separation units [33,35–46].
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2018, Journal of Membrane ScienceCitation Excerpt :Therefore, to simulate membrane model in Aspen Plus simulation environment, users have to create the membrane model in Fortran, Microsoft Excel, or JACOBIAN code and import the code to Aspen Plus [116,117]. Alternatively, the user may make the membrane model using Aspen Custom Modeller, which is an Aspen Plus product that allows the creation of a rigorous model for process equipment [118]. Once the membrane model has been incorporated into Aspen Plus simulation environment, it can be used in the same way as any other model in the Aspen Plus model library.
Numerical analysis of an ion transport membrane system for oxy–fuel combustion
2018, Applied EnergyCitation Excerpt :Nemitallah et al. developed an ITM reactor model to predict the oxygen permeation rate and the oxy–fuel combustion characteristics using the ITM reactor [42]. Turi et al. presented the ITM model that axially resolved the oxygen concentration distribution and oxygen permeation rate [43]. Mancini and Mitsos developed the quasi two-dimensional ITM model, based on the fundamental conservation equations and the semi-empirical oxygen transport equations [44].
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2020, Journal of Advanced Manufacturing and Processing