52,507 Hits in 5.8 sec

CO2-brine-mineral Interfacial Reactions Coupled with Fluid Phase Flow

Dedong Li, Christof Beyer, Sebastian Bauer
2013 Energy Procedia  
For a model based assessment of CO 2 storage, most simulation codes apply an operator-splitting approach to solve the coupled problem, where multi-phase flow and geochemical reactions are handled by separate  ...  The code is used here to investigate a simple gas-liquid-solid phase (CO 2 -H 2 O-CaCO 3 ) system controlled by fast reaction rates.  ...  Technology Research GmbH, Wintershall Holding GmbH and Stadtwerke Kiel AG as part of the CO2-MoPa joint project in the framework of the Special Programme GEOTECHNOLOGIEN.  ... 
doi:10.1016/j.egypro.2013.06.278 fatcat:2wstof35anfm3d5byhwk6nb5ma

Modelling Transient Leaks of Multi-Component Fluids Including Time-Varying Phase Composition

Jan Stene, Mike Harper, W.M. Witlox Henk
2016 Chemical Engineering Transactions  
Previously the model could only handle pure components or "pseudo-component" mixtures, but the new multi-component model carries out vapour-liquid equilibrium (VLE) calculations.  ...  This allows accurate predictions of the phase envelope between a mixture's bubble point and dew point.  ...  This gives a total fluid mass of about 2302.5 kg, and Table 1 shows the vapour and liquid compositions and masses as calculated based on vapour-liquid equilibrium.  ... 
doi:10.3303/cet1648029 doaj:38e60ea2924441038a6c2354a1a01c37 fatcat:m4gx3iilfff7bmjto6vlncpkle

New processes for recovery of acetic acid from waste water

Jignesh Gangadwala, Gabriel Radulescu, Achim Kienle, Frank Steyer, Kai Sundmacher
2007 Clean Technologies and Environmental Policy  
The presence of a three-phase regime on the column stages due to a liquid-liquid phase split between aqueous and organic phases is a typical characteristic of this process.  ...  A modern modeling approach is presented to detect the existence of potential phase splitting in this column. A good agreement of a phase splitting model with the literature data has been shown.  ...  To reliably predict the liquid-liquid phase split on the column trays in the course of a simulation run, an extra routine for the phase split calculations is required.  ... 
doi:10.1007/s10098-007-0101-z fatcat:b7dvuryxwreddbwwrynl4yskme

Flowsheet synthesis and complex distillation column design for separating ternary heterogeneous azeotropic mixtures

Paritta Prayoonyong, Megan Jobson
2011 Chemical engineering research & design  
Multiple feasible designs can be generated for a given set of product specifications, according to the reflux ratio, number of heterogeneous stages and liquid phase ratio; these designs may be evaluated  ...  with respect to operating and equipment costs.  ...  The new design approach does not restrict two liquid phases only to the top decanter 1, 2 , does include the reflux phase split ratio as a degree of freedom for design 1, 2, 3 , and does not need the  ... 
doi:10.1016/j.cherd.2011.02.015 fatcat:55uihuwb3vdvld4ioilwykb2sy

Splitting methods for relaxation two-phase flow models

H. Lund, P. Aursand
2013 International Journal of Materials Engineering Innovation  
A model for two-phase pipeline flow is presented, with evaporation and condensation modelled using a relaxation source term based on statistical rate theory.  ...  The stiff relaxation term is solved using two approaches: One based on the Backward Euler method, and one using a time-asymptotic scheme.  ...  The authors would also like to acknowledge Svend Tollak Munkejord, Bernhard Müller and Tore Flåtten for their useful comments.  ... 
doi:10.1504/ijmatei.2013.054391 fatcat:lngs2z3oqzerxfpaovmzxgfyxy

Modelling of a dynamic multiphase flash: the positive flashApplication to the calculation of ternary diagrams

2004 Computers and Chemical Engineering  
Topical Heading Process System Engineering CONCEPTS LEADING TO THE "POSITIVE FLASH" MODELLING The "negative flash" An approach called the "negative flash" in which the vapor -liquid phase split ratio is  ...  Later, this formulation was extended to liquid -liquid dynamic equilibrium (Heinichen, 1994) .  ...  CALCULATION APPROACHES FOR VAPOR -LIQUID -LIQUID MIXTURE EQUILIBRIUM CALCULATIONS.  ... 
doi:10.1016/s0098-1354(04)00146-2 fatcat:kvbuxteewjhcnhoc6hfrtileoq

Compositional Description of Three-Phase Flow Model in a Gas-Lifted Well with High Water-Cut

M. Mahmudi, M. Taghi Sadeghi
2013 Oil & Gas Science and Technology  
Moreover, three-phase equilibrium calculations for hydrocarbon-water flow mixtures in the gas-lifted well with moderate and high water-cut are required.  ...  Due to different properties of the injection gas and produced gas in separators, the compositional treatment would be necessary for modeling the gas-lift process.  ...  The most common way was to perform a two-phase equilibrium calculation combined with a steam table instead of a real three-phase equilibrium calculation [7, 8] .  ... 
doi:10.2516/ogst/2012060 fatcat:xwi3hdjdvfbbpicncru3p4kfde

Comparison of Energy Consumption for Different CO2 Absorption Configurations Using Different Simulation Tools

Lars Erik Øi, Stian Holst Pedersen Kvam
2014 Energy Procedia  
In the Aspen Plus calculations, both an equilibrium based model including Murphree efficiencies and a rate-based approach were used.  ...  Different absorption and desorption configurations for 85 % CO 2 removal from a natural gas fired combined cycle power plant have been simulated with the process simulation tools Aspen HYSYS and Aspen  ...  Rate-based simulation A rate-based model simulates an absorption column by separating the liquid and vapour flow in the column and is based on the calculation of the heat and mass transfer rates between  ... 
doi:10.1016/j.egypro.2014.11.128 fatcat:mqhvtchqjrbiznny4mhavb6h4y

Thermodynamics and Machine Learning Based Approaches for Vapor–Liquid–Liquid Phase Equilibria in n-Octane/Water, as a Naphtha–Water Surrogate in Water Blends

Sandra Lopez-Zamora, Jeonghoon Kong, Salvador Escobedo, Hugo de Lasa
2021 Processes  
Runs were developed in a CREC vapor–liquid (VL_ Cell operated with octane–water mixtures under dynamic conditions and used to establish the two-phase (liquid–vapor) and three phase (liquidliquid–vapor  ...  significant phase equilibrium uncertainties still exist.  ...  The authors would also like to thank the Natural Science and Engineering Research Council of Canada (NSERC) and the industrial sponsor, Syncrude Canada Ltd., for the financial support provided to  ... 
doi:10.3390/pr9030413 fatcat:uijkfgig6bfoxkt7oyb34jegce

Modeling of water evaporation from a shrinking moist biomass slab subject to heating: Arrhenius approach versus equilibrium approach

Peyman Rahimi Borujerdi, Babak Shotorban, Shankar Mahalingam, David R. Weise
2019 International Journal of Heat and Mass Transfer  
The evaporation rate, liquid moisture mass fraction and temperature profiles obtained by using the equilibrium model exhibited abrupt changes at the evaporation front whereas those obtained by using the  ...  For calculations, Gpyro, a pyrolysis computational framework, was used after its source code was revised to include the equilibrium model.  ...  (14) ) is used to calculate the evaporation rate of liquid water while excluding the transport terms: where w and Dz from the previous iteration are used to calculate After calculating the evaporation  ... 
doi:10.1016/j.ijheatmasstransfer.2019.118672 fatcat:kivkk4j5ifcb3iafo4ww3ye2qa

Biodiesel Production by Reactive Flash: A Numerical Simulation

Alejandro Regalado-Méndez, Sigurd Skogestad, Reyna Natividad, Rubí Romero
2016 International Journal of Chemical Engineering  
Reactive flash (RF) in biodiesel production has been studied in order to investigate steady-state multiplicities, singularities, and effect of biodiesel quality when the RF system approaches to bubble  ...  The RF was modeled by an index-2 system of differential algebraic equations, the vapor split (ϕ) was computed by modified Rachford-Rice equation and modified Raoult's law computed bubble point, and the  ...  Acknowledgments The authors are grateful to PRODEP (before PROMEP) for financial support through PROMEP/103.5/10/5552.  ... 
doi:10.1155/2016/7843081 fatcat:3ijbfyxswvgjrdlblywu2iz7zq

Numerical simulation of subcooled and superheated jets under thermodynamic non-equilibrium

Konstantinos Lyras, Siaka Dembele, David P. Schmidt, Jennifer X. Wen
2018 International Journal of Multiphase Flow  
Novel additional tests for the flow characteristics and vapour generation in cryogenic liquid cases are included showing that the solver can be employed to gain some new insights into the physics of the  ...  In the present study, FlashFOAM a compressible solver for calculating the phase change within various nozzle geometries undergoing rapid pressure drops has been developed in the frame of the open source  ...  Acknowledgements The authors wish to thank the Marie Curie Action of the 7th Framework Programme of the European Union.  ... 
doi:10.1016/j.ijmultiphaseflow.2018.01.014 fatcat:drxt5zamgzgezkes67ldrvxpxq

Rate-Based Modeling of CO2 Absorption in Aqueous NH3 in a Packed Column

Guojie Qi, Shujuan Wang, Hai Yu, Paul Feron, Changhe Chen
2013 Energy Procedia  
A rigorous rate-based model for the aqueous ammonia (NH 3 ) based CO 2 absorption in a packed column has been used to simulate the recently available results from pilot plant trialing of aqueous NH 3 based  ...  The predicted results from the rate-based model also agree reasonably well with pilot plant results including CO 2 absorption rate and NH 3 loss rate.  ...  The views expressed herein are not necessarily the views of the Commonwealth, and the Commonwealth does not accept responsibility for any information or advice contained herein.  ... 
doi:10.1016/j.egypro.2013.06.077 fatcat:thcdxbsir5b5ndaoy653gpo7si

Minimum Solvent Flow Rate for Counter-Current Liquid-Liquid Extraction Columns

J. Bonet, V. Plesu, A.E. Bonet Ruiz, A. Tuluc, J. Llorens, P. Iancu
2014 Chemical Engineering Transactions  
A simple scheme to determine the minimum solvent flow rate for counter-current extraction columns is obtained and its validity is verified using two case studies.  ...  An infinite number of equilibrium stages are simplified to a single equilibrium stage.  ...  Acknowledgements The authors would like to thank the financial support of POSCCE project ID 652 (Structural Funds for Development and Cohesion).  ... 
doi:10.3303/cet1439296 doaj:bf815c1a8c234eb9b774a313afc8a355 fatcat:qrc23wa4dzgblbxj3ttjovvpua

Non-equilibrium phase behavior of hydrocarbons in compositional simulations and upscaling

Ilya M. Indrupskiy, Olga A. Lobanova, Vadim R. Zubov
2017 Computational Geosciences  
Numerical models widely used for hydrocarbon phase behavior and compositional flow simulations are based on assumption of thermodynamic equilibrium.  ...  The only method to account for non-equilibrium phase behavior adopted by the majority of flow simulators is the option of limited rate of gas dissolution (condensate evaporation) in black oil models.  ...  Thus standard equilibrium stability test [23] is suitable to control the necessity of phase split calculations.  ... 
doi:10.1007/s10596-017-9648-x fatcat:zsjacvucwvflvcrdtaj7lt3p2y
« Previous Showing results 1 — 15 out of 52,507 results