Holdup and Pressure Drop in Micro Packed-Bed Reactors for Fischer-Tropsch Synthesis

2013 ◽  
Vol 85 (4) ◽  
pp. 455-460 ◽  
Author(s):  
Carsten Knobloch ◽  
Robert Güttel ◽  
Thomas Turek
Keyword(s):  
Pressure Drop ◽  
Packed Bed ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Packed Bed Reactors

Experimental and numerical comparison of structured packings with a randomly packed bed reactor for Fischer–Tropsch synthesis

2009 ◽  
Vol 147 ◽  
pp. S2-S9 ◽  
Author(s):  
Kalyani Pangarkar ◽  
Tilman J. Schildhauer ◽  
J. Ruud van Ommen ◽  
John Nijenhuis ◽  
Jacob A. Moulijn ◽  
...  
Keyword(s):  
Packed Bed ◽  
Tropsch Synthesis ◽  
Packed Bed Reactor ◽  
Numerical Comparison ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Structured Packings

A Trickle Fixed-Bed Recycle Reactor Model for the Fischer-Tropsch Synthesis

2012 ◽  
Vol 10 (1) ◽  
Author(s):  
Kyle M. Brunner ◽  
Joshua C. Duncan ◽  
Luke D. Harrison ◽  
Kyle E. Pratt ◽  
Robson P. S. Peguin ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Prandtl Number ◽  
Fixed Bed ◽  
Effective Diffusivity ◽  
Tropsch Synthesis ◽  
Fixed Bed Reactor ◽  
Maximum Temperature ◽  
Reactor Model ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

A trickle fixed-bed reactor model for the Fischer-Tropsch synthesis applicable to both cobalt and iron catalysts which accounts for gas and liquid recycle is described. A selection of kinetic models for both iron and cobalt catalysts (4 each) is included in the reactor model and their effect on model predictions is compared. While the model is 1-D and reaction rates are determined for quasi-average radial bed temperatures, a correlation is used to account for radial thermal conductivity and radial convective heat transfer. Traditional pressure drop calculations for a packed column were modified with a correlation to account for trickle-flow conditions. In addition to describing the model in detail and showing validation results, this paper presents results of varying fundamental, theoretically-based parameters (i.e. effective diffusivity, Prandtl number, friction factor, etc.). For example, the model predicts that decreasing effective diffusivity from 7.1E-09 to 2.8E-09 m2/s results in a lower maximum temperature (518 K vs. 523 K) and a longer required bed length to achieve 60% conversion of CO (8.5 m vs. 5.7 m). Using molar averages of properties to calculate the Prandtl number for the gas phase (recommended by the authors) results in average bed temperatures up to 10 K higher and reactor lengths 17-45% shorter than assuming a Prandtl number of 0.7. Using the Tallmadge equation to estimate friction losses, as recommended by the authors, results in a pressure drop 40% smaller than using the Ergun equation. Validation of the model was accomplished by matching published full-scale plant data from the SASOL Arge reactors.

scholarly journals Dynamically Operated Fischer-Tropsch Synthesis in PtL-Part 1: System Response on Intermittent Feed

2020 ◽  
Vol 4 (2) ◽  
pp. 21 ◽  
Author(s):  
Marcel Loewert ◽  
Peter Pfeifer
Keyword(s):  
Packed Bed ◽  
Pilot Scale ◽  
Tropsch Synthesis ◽  
System Response ◽  
Negative Effects ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Cycle Times ◽  
Liquid Products ◽  
Term Energy

Society is facing serious challenges to reduce CO2 emissions. Effective change requires the use of advanced chemical catalyst and reactor systems to utilize renewable feedstocks. One pathway to long-term energy storage is its transformation into high quality, low-emission and CO2-neutral fuels. Performance of technologies such as the Fischer-Tropsch reaction can be maximized using the inherent advantages of microstructured packed bed reactors. Advantages arise not only from high conversion and productivity, but from its capability to resolve the natural fluctuation of renewable sources. This work highlights and evaluates a system for dynamic feed gas and temperature changes in a pilot scale Fischer-Tropsch synthesis unit for up to 7 L of product per day. Dead times were determined for non-reactive and reactive mode at individual positions in the setup. Oscillating conditions were applied to investigate responses with regard to gaseous and liquid products. The system was stable at short cycle times of 8 min. Neither of the periodic changes showed negative effects on the process performance. Findings even suggest this technology’s capability for effective, small-to-medium-scale applications with periodically changing process parameters. The second part of this work focuses on the application of a real-time photovoltaics profile to the given system.

scholarly journals Concentration and Temperature Gradients along Packed Bed of 2l Iron Catalyst in Reactor for Fischer-Tropsch Synthesis

1960 ◽  
Vol 63 (9) ◽  
pp. 1588-1593
Author(s):  
Michio Kuraishi ◽  
Hideo Ichinokawa ◽  
Kiyoshi Ogawa ◽  
Minoru Kurita ◽  
Tadasuke Hosoya ◽  
...  
Keyword(s):  
Iron Catalyst ◽  
Packed Bed ◽  
Tropsch Synthesis ◽  
Temperature Gradients ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

Hydrodynamics and Reaction Performances of Multiphase Reactors for Marine Applications – A Review

2018 ◽  
Vol 17 (5) ◽  
Author(s):  
Ion Iliuta ◽  
Faïçal Larachi
Keyword(s):  
Steady State ◽  
Packed Bed ◽  
Steady State Solution ◽  
Tropsch Synthesis ◽  
Water Gas Shift ◽  
Water Gas Shift Reaction ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Shift Reaction ◽  
Water Gas

Abstract Hydrodynamics and (catalytic & non-catalytic) reaction [high-pressure hydrodesulfurization; Fischer-Tropsch synthesis; CO2-monoethanolamine (MEA) absorption; simultaneous CO2 and H2S absorption in MEA; CO2 thermal desorption, enzymatic CO2 hydration] performances of trickle-bed and packed-bed column reactors subjected to static inclination, rolling (symmetrical/asymmetrical externally-generated reactor oscillations) and heaving motions were analyzed via detailed dynamic 3-D models which couple the macroscopic volume-averaged momentum, mass, energy and species balance equations in the liquid/gas phases with diffusion/chemical reaction inside the catalyst particles, enzyme washcoat or liquid film near the gas-liquid interface. Axial symmetry breakdown once the packed bed systems become inclined inflicts noticeable reductions of the reactor (or scrubber) performances. Only the performance of Fischer-Tropsch synthesis in the presence of water-gas shift reaction increases slightly with the increase of trickle-bed reactor inclination because of facile uptake of reactants in the key reactions from the gas phase while a fraction of valuable CO can be forwarded in water gas-shift reaction. For most of the reactions examined, the reactor performance is negatively impacted in asymmetric oscillating multiphase reactors with Fischer-Tropsch synthesis as an exception owing to the presence of water-gas shift reaction the performance of which is slightly improved. This performance deterioration/enhancement is maximal for the reactor moving between vertical and an inclined position when the time-dependent performance waves develop around the steady-state solution of the mid-inclination angle. The oscillatory reactor performance moves towards the steady-state solution of the vertical state when the asymmetry between the two inclined positions dwindles. Symmetric oscillating and heaving trickle-bed and packed-bed column reactors generate an oscillatory performance around the steady-state solution of vertical state which is affected by the amplitude and period of the angular and heaving motions of the vessel.

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