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Engineering
Materials and Chemical Engineering
Modelling of two phase flow in packed bed (continued)
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[QUOTE="Chestermiller, post: 6613932, member: 345636"] Are you sure you are not primarily interested in separating CO2 from combustion products (not air). We are assuming that the condensed liquid travels at the same superficial velocity as the gas and, at least tentatively, that it is not deposited on- or slowed down by the bed. Your calculations have shown that this is not too bad an assumption since all the conversion from vapor to liquid occurs over a very short section (only a few tanks) of the bed. I assume you are never going to have both air- and CO2 condensation/desublimation in the same model. So the existing model would handle air condensation along and a new model would focus on CO2 separation from a combustion gas. Is this a possibility in your thinking? In the latter case, water condensation would also have to be handled in some way, in combination with the CO2 deposition. So there would be two models: 1. Air condensation model without CO2 and water 2. Combustion gas separation model without N2 and O2 condensation, but with water condensation and CO2 desublimation. Model 1 would basically be the existing model, featuring 1. High pressure, non-ideal thermodynamics for the gas phase 2. No deposition of solid or liquid onto or off of the solid bed (No fluid to solid interphase mass transfer) 3. Separate temperatures for the solid and fluid phases Model 2, the CO2 separation model, would include 1. Low pressure, ideal gas thermodynamics for the gas phase 2. Deposition of CO2 (and possibly water) from the gas to the solid and CO2 sublimation from the solid to the gas 3. Relatively low CO2 concentrations, so it can be treated as a trace species, without counterdiffusion mass transfer effects. 4. Separate temperatures for the solid and fluid phases (even though the Tuinier model lumps the phases to a single temperature). I think this flexibility should be retained. Thoughts? I have lots to say about the Tuinier model, but am running short in time now, so I will address this later. [/QUOTE]
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Modelling of two phase flow in packed bed (continued)
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