• 0 Coal and gas fired power plants are the main contributors of CO2 emissions. CAPSOL technology offers a competitive solution for the efficient post-combustion CO2 capture. (Public Power Corporation, Agios Dimitrios Power Plant)…
  • 1 CAPSOL incorporates state-of-the-art thermodynamic property prediction and Computer Aided Molecular Design for advanced solvents and blends. (Source : Imperial College - London)…
  • 2 CAPSOL technology utilizes multi-level design and selection of validated solvent-process schemes with optimum economic and controllability features. (Papadopoulos A.I., and P. Seferlis, “A framework for solvent selection based on optimum separation process design and controllability properties”,Computer Aided Chemical Engineering, 26, 177-182, 2009.)…
  • 3 CAPSOL aims at optimum design of absorption/desorption equipment and column internals through advanced modelling and experimentation (Kenig, E.Y. (2008), Chem. Eng. Res. Des. 86, Part A, 1059–1072)…
  • 4 CAPSOL aims at sustainable CO2 capture technology through the Environmental Performance Strategy Map (De Benedetto L., Klemeš J., 2009. J. Clean. Prod., 17(10), 900-906)…
  • 5 CAPSOL targets plant level (resources) integration of CO2 emitting and capture plants through total-site and plant-wide optimization analysis (Varbanov, P., Perry, S., Klemeš J.,Smith, R., (2005), Applied Thermal Engineering, 25, 985-1001)…
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CAPSOL new packing developed

Post-combustion capture plants, as considered for the CAPSOL project, apply absorption and desorption technology to separate CO2 from flue gas. The project focused on the absorption of CO2 into amine based solvents followed by stripping of CO2 in a desorber, which up to date is considered to be the most promising technology. Hence, columns for absorption and desorption are involved that apply these internals. It is well known that choosing the right technology for mass transfer internals is very important, as their specific characteristics in terms of pressure drop, hydraulic and separation performance are significant factors for operating and investment costs of CO2 capture plants.

The most promising structured packing characteristic to be optimized for CO2-absorption purposes was identified to be the specific pressure drop. A lower specific pressure drop will lead to reduced energy consumption of the flue gas blower. The predominant modification method to reduce the pressure drop is to increase the inclination angle of the oppositely oriented flow channels of corrugated sheets structured packings are made of. CFD simulations were performed and the diagram shown in Figure 1 could be derived. The diagram shows the dry pressure drop depending on the inclination angle for various F-factors.

 

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Figure 1 - Changing of pressure drop with increasing inclination angle.

 

As can be seen, at inclination angles above 70°, the pressure drop is only decreasing marginal. At this point it was decided to manufacture a packing with an inclination angle of 75° at Julius Montz GmbH (MONTZ) (Figure 2). This packing would show a very low pressure drop, while the film flow at the packing surface could still persist.

 

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Figure 2 – Photos of manufacturing of B1-250.75 at Julius Montz GmbH.

 

Fluid dynamic experiments at the University of Paderborn (UPB) confirmed the drastic reduction of the pressure drop for both dry and irrigated conditions. Figure 3 shows a comparison of the measured dry pressure drop for a packing with 45° and 75° inclination angle. Figure 4 shows the same comparison at irrigated conditions. At F-factors between 2 and 3 Pa0,5 the pressure drop can be reduced by 90 to 97%.


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Figure 3 - Comparison of the dry pressure drop of packings with 45° and 75° inclination angle.


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Figure 4 - Comparison of the pressure drop of irrigated packings (45° and 75° inclination angle) at 20 m3m 2h-1.

 

In addition, experiments were conducted to evaluate the absorption efficiency using this new packing. As expected, the absorption rate is slightly decreased for the new packing geometry with the steeper inclination angle.

 

Hüser, N., Dubjella, P., Hugen, T., Rietfort, T. and Kenig, E.Y., Experimentelle Untersuchung und Bewertung einer strukturierten Packung mit 75°-Neigungswinkel für die CO2-Abscheidung, In: ProcessNet-Jahrestagung und 31. DECHEMA-Jahrestagung der Biotechnologen, Aachen, 2014, Chemie Ingenieur Technik 86: 1451-1452, 2014.