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| Modeling Liquid maldistribution |
31 May 2019 |
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At the 2019 Spring AIChE meeting Ross Taylor presented
"Simulating Maldistributiion in Packed Columns".
In this paper we review the literature on simulating packed columns with maldistribution.
We then show how easily the ChemSep Parallel Column Model for DWCs may be used to describe maldistribution in packed columns and show how our results match the obtained results of earlier papers.
We found a simple bed effectiveness approximation that allows the design of packed beds that are robust for the effects of liquid maldistribution.
We illustrate with a practical example involving the design of acommercial scaleArgon column (from an air separation plant) with structured packing.
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| ChemSep v8.11 Stream Curves |
4 January 2019 |
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We released an update of ChemSep LITE 8v1
with stream curves as new feature, which allow calculation of heating/cooling curves
for heat exchanger design (or deeper analysis). Any internal stream can be used, so that the condenser/reboilers can be handled.
Furthermore, Matthias-Copeman EOS parameters can be fitted and we improved the extrapolation for CpIG to very high temperatures
(e.g. 10000 K). We sped up the loading of large sep-file and fixed various bugs.
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| ChemSep receives the CO-LaN Award for 2017 at the CAPE-OPEN 2018 Annual Meeting |
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We attended the CAPE-OPEN 2018 Annual Meeting
where we announced our release date for the new ChemSep LITE v8 and ChemSep was awarded the
CO-LaN Award for 2017
for the the sustained and long-lasting involvement of ChemSep with CAPE-OPEN.
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| ChemSep v7.4 UNIFAC (NIST) |
May 2018 |
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We added the UNIFAC group contribution method by NIST Thermodynamics Research Center (TRC)
and access to the Viginia Tech (VT) COSMO databank.
The UNIFAC (NIST) was defined with more main groups (89) and fitted on VLE, LLE, and SLE data with more
group interaction parameters (984) than the original UNIFAC (FPE388p128) and will provide much better
descriptions of vapor-liquid equilibria in distillation column simulations than the original UNIFAC.
The VT sigma profiles will be used in COSMO-based activity and equation of state thermodynamic models.
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| ChemSep PCM (Parallel Column Model) |
April 2018 |
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ChemSep user interface has been adapted to fully automate the input for simulating Divided Wall Columns (DWC) as demonstrated at the
Spring AIChE 2018 meeting in Orlando.
The GUI has been adapted to automatically display profiles and McCabe-Thiele plots for this type of columns,
allowing a rapid analysis and optimization. A new version of ChemSep that includes the PCM model will be released
later in spring.
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| ChemSep v7.3 Export to COCO flowsheets |
December 2017 |
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New in release 7.30 is the ability to export any column or flash simulation to a flowsheet in COCO.
Furthermore, we added refinements in our solving algorthms to enhance convergence.
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| ChemSep v7.2 Column Rating |
October 2017 |
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To facilitate actual column design we added a new rating panel for a rapid design of the column internals.
This new feature was demonstrated at the CAPE-OPEN 2017 Annual Meeting in London.
The rating panel includes the new Duss-Taylor efficiency estimation that provides realistic estimates for tray efficiency and packed bed HETP based on the
liquid viscosity and local equilibrium line slope for the design component. The columnn is automatically split
into column sections from the placement of feeds and draws, but the user is free to add and remove them.
Each column section can be designed individually. The completed column design can then directly be loaded into
a vendor tool to obtain hydraulic performance e.g. pressure drops and flood fractions and further detail tray
layouts. The supported tools are KG-Tower of Koch-Glitsch, WinSorp of Raschig, and SulCol of Sulzer chemtech.
The rating panel also contains a Total Anualized Cost (TAC) estimate for the chosen hardware design.
This enables the user to perform parametric studies to determine the lowest TAC as function of
reflux or boilup ratio, number of stages, feed locations etc.
In release v7.2 we made further improvements
to our column initialization such that convergence improved, especially for problems where compositions and
recoveries are specified without providing estimates on the column. This particularly improves the rebustness
of ChemSep column used in flowsheet calculations.
Finally, by including group contribution method parameters in our sep-files it is now possible to fit these
group interaction parameters on multiple binary vapor-liquid equlibria data sets, using our binary phase
diagram drawing tool.
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Copyright © Fri May 31 14:57:27 2019 ChemSep
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