期刊
CHEMICAL ENGINEERING SCIENCE
卷 178, 期 -, 页码 284-296出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2017.12.022
关键词
Gas-liquid flow; Cross-flow; Flooding; CFD; Structured packings; Carbon capture
资金
- EPSRC SELECT project [EP/M001482/1]
- UK Royal Academy of Engineering
- Engineering and Physical Sciences Research Council [EP/M001482/1] Funding Source: researchfish
- EPSRC [EP/M001482/1] Funding Source: UKRI
We introduce novel insights into a cross-flow arrangement of structured packings specifically for post-combustion carbon dioxide capture. Gas-liquid dynamics are investigated numerically, with the liquid flowing under the action of the gravity and the gas driven by a horizontal pressure gradient crossing the liquid phase. An elementary packing cell consists of two connected channels: one depicting a cocurrent gas-liquid flow and the other depicting a counter-current two-phase flow. While flow reversal of the liquid phase can occur in the counter-flow channel at high gas flow rates, the overall flooding point is significantly delayed in comparison to a counter-current flow arrangement traditionally used for structured packings. Varying the gas flow rate and the tilting angle of the elementary cell, a detailed numerical analysis of the flow repartition between channels, the pressure drop, the gas and liquid velocities, and the onset of flooding is presented. The pressure drop is found to be smaller when tilting the cell with respect to the initial scenario at 45 degrees. Flow reversal instead is delayed when lowering the tilting angle, that is when the cell is tilted anti-clockwise. We also reveal the presence of long waves at the edge of the cell at low tilting angles. Finally, data of the wet pressure drop in the cross-flow cell are compared with different commercially available types of packing arranged in a conventional vertical counter-flow configuration, such as several versions of the Sulzer MellapakTM. (C) 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license.
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