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This page lists published scientific and/or technical papers/articles which use or cite DWSIM to some extent.

Technical Papers

Process Simulation Unit Operation Models - Review of Open and HSC Chemistry I/O Interfaces

Author: Marko Leino

Abstract: Chemical process modelling and simulation can be used as a design tool in the development of chemical plants, and is utilized as a means to evaluate different design options. The CAPEOPEN interface standards were developed to allow the deployment and utilization of process modelling components in any compliant process modelling environment. This thesis examines the possibilities provided by the CAPE-OPEN interfaces and the .NET framework to develop compliant, cross-platform process modelling components, particularly unit operations. From the software engineering point of view, a unit operation is a representation of physical equipment, and contains the mathematical model of its functionality. The study indicates that the differences between the CAPE-OPEN standards and Outotec HSC Chemistry Sim are negligible at the conceptual level. On the other hand, at the implementation level, the differences are quite considerable. Regardless of the simulation application being used, the modelling of unit operations requires interdisciplinary skills, and creating tools and methods to ease the development of such models is well justified. The results of this study suggest that CAPE-OPEN both provides various paths to change the way HSC Chemistry Sim works and offers the HSC development team a chance to determine an alternative way to distribute tasks between simulation components. In addition, making HSC Chemistry Sim compliant would bring benefits, such as an extended process modelling component library, and perhaps more publicity. Obviously, the workload required by the changes depends on the chosen path, which invariably entails a lengthy learning curve. This thesis contributes by helping to make that learning curve shorter.

Keywords: CAPE-OPEN, HSC Chemistry Sim, unit operation, process simulation

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Development of a Thermodynamic Engine in OpenModelica

Authors: Rahul Jain, Kannan M. Moudgalya, Peter Fritzson, Adrian Pop

Publication: Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017, Volume , Issue 132, 2017-07-04, Pages 89-99, ISSN 1650-3740

Abstract: OpenModelica, an open source equation oriented modeling environment for steady state and dynamic simulation, lacks good chemical engineering support. This problem is addressed by making available in different ways the thermodynamic library Chemsep that comes with DWSIM, an open source sequential modular steady state simulator. Only slow speeds could be achieved through a Python-C API based interface connecting OpenModelica with the thermodynamic library. A socket programming based interface helps achieve faster speeds. Best results have been achieved by porting the thermodynamic library and the calculation routines to OpenModelica, due to two reasons: (1) thermodynamic equations are solved simultaneously with mass and energy balances (2) overheads in calling the external routines of DWSIM are eliminated. Performances of the above mentioned three approaches have been validated with steady state and dynamic simulations. Benzene - toluene separation, methanol - ethanol - water distillation, and steam distillation of an n-octane - n-decane mixture, have been carried out through these simulations. This work makes available a powerful simulation platform to the chemical engineering.

Keywords: OpenModelica DWSIM Chemsep thermodynamics modeling simulation chemical engineering media Python-C API Socket programming

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Scientific Papers

Model and Simulation of a Hydrotreatment Reactor for Diesel Hydrodesulfurization in Oil Refining

Authors: Jorge Buitrago, Dario Amaya and Olga Ramos

Publication: Contemporary Engineering Sciences, Vol. 10, 2017, no. 25, 1245-1254

Abstract: One of the most developed industries in the world is the industry dedicated to extraction and treatment of crude oil, due to his economic profitability. One of the equipment more important in any process is the reactor, which is the place where the physico-chemical transformations of the matter are carried out. The hydrotreatment process is used in oil refining, to decrease the level of different contaminants in the crude. Usually, this process is applied to the clearance of sulphur in contaminated streams. The process was modeled and simulated through the Open Source DWSIM software, using hydrogen as reactant and Ni-Mo ūĚõĺūĚźīūĚĎô2ūĚĎā3 as catalyst. As product was obtained acid crude. It was chosen the model Chao Seader to predict the main properties of each compound present in the reactor. Through the reuse of hydrogen in the system, it was possible reach a 0.0093% weight of Sulphur in the final crude stream. Furthermore, it was designed the furnace used to warm up the mixture for the reactor and the cooler used to separate the volatile compounds.

Keywords: Heavy diesel, Chemical reactor, Chemical simulation, DWSIM, Chao Seader model, HDS

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Chemical engineering aspects of plasma-assisted CO2 hydrogenation over nickel zeolites under partial vacuum

Authors: Federico Azzolina-Jury, Diogo Bento, Carlos Henriques, Frédéric Thibault-Starzyk

Publication: Journal of CO2 Utilization, Volume 22, 2017, Pages 97-109, ISSN 2212-9820

Abstract: Ni-zeolites (ZSM-11 and USY) were prepared for application in carbon dioxide hydrogenation. Structure, physical properties and texture were analyzed by XRD, N2 sorptiometry, SEM and TEM images. The zeolites nickel reducibility (determined by in-situ TPR-MS) was directly related to the catalytic activity of zeolites. Glow-discharge plasma-assisted CO2 hydrogenation was carried out under partial vacuum using a packed-bed catalytic reactor under two different configurations: In-Plasma Catalysis (IPC) and Post-Plasma Catalysis (PPC). CO2 hydrogenation into CO (CO2+H2‚ÜíCO+H2O) and CO2 methanation (CO2+4H2‚ÜíCH4+2H2O) reactions were more efficient when the reaction was assisted by plasma using the IPC mode. In IPC mode, a novel phenomenon was observed: a considerable amount of methane was released from the catalyst after plasma extinction. This phenomenon was explained combining the operando IR plasma technique and the analysis of the carbon balance during the plasma-assisted CO2 hydrogenation reaction. Both configurations (IPC and PPC) were studied under different volumetric flow rates and the minimum lifetime of excited species generated within the plasma discharge for methane production was determined. The lifetime of the more active species which are responsible for methane production was lower than 67ms. Under the operation conditions used in this work, methane production was only possible when CO2 hydrogenation was performed in IPC mode. CO2 hydrogenation was found to be more energy efficient when the reaction was carried out under plasma assistance compared to conventional heating. Higher CO2 conversions, CO and CH4 yields were achieved with respect to conventional heating at lower temperatures when plasma assistance was used.

Keywords: Plasma; Glow discharge; CO2 methanation; Nickel zeolites; operando IR

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Techno-Economic Comparison of Onshore and Offshore Underground Coal Gasification End-Product Competitiveness

Authors: Natalie Christine Nakaten, Thomas Kempka

Publication: Energies 2017, 10(10), 1643; doi:10.3390/en10101643 (registering DOI)

Abstract: Underground Coal Gasification (UCG) enables the utilisation of coal reserves that are currently not economically exploitable due to complex geological boundary conditions. Hereby, UCG produces a high-calorific synthesis gas that can be used for generation of electricity, fuels and chemical feedstock. The present study aims to identify economically competitive, site-specific end-use options for onshore and offshore produced UCG synthesis gas, taking into account the capture and storage (CCS) and/or utilisation (CCU) of resulting CO 2 . Modelling results show that boundary conditions that favour electricity, methanol and ammonia production expose low costs for air separation, high synthesis gas calorific values and H 2 /N 2 shares as well as low CO 2 portions of max. 10%. Hereby, a gasification agent ratio of more than 30% oxygen by volume is not favourable from economic and environmental viewpoints. Compared to the costs of an offshore platform with its technical equipment, offshore drilling costs are negligible. Thus, uncertainties related to parameters influenced by drilling costs are also negligible. In summary, techno-economic process modelling results reveal that scenarios with high CO 2 emissions are the most cost-intensive ones, offshore UCG-CCS/CCU costs are twice as high as the onshore ones, and yet all investigated scenarios except from offshore ammonia production are competitive on the European market. View Full-Text

Keywords: Underground Coal Gasification (UCG); economics; Cost of Electricity (COE); techno-economic model; methanol; ammonia; Carbon Capture and Storage (CCS); Carbon Capture and Utilisation (CCU); electricity generation; process simulation

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Mix-n-match Reservoir Coupling in Integrated Modeling and Optimization

Authors: Silvya Dewi Rahmawati (Petrostreamz AS/ITB) | Mohammad Faizul Hoda (Petrostreamz AS) | Daniel Wagner (CAPE-OPEN) | Arif Kuntadi (Petrostreamz AS)

Abstract: Reservoir Coupling (running multiple reservoir models in a concerted manner) features have been offered by software vendors for some time but with severe limitations. The participating models necessarily use the same vendor simulators and the models are usually limited to black-oil versions. This paper presents an integrated modeling and optimization solution with vendor independent participating simulators. The three reservoir models use simulators from different vendors (SENSOR¬ģ, ECLIPSE¬ģ, and MORE¬ģ). One model uses a black-oil PVT formulation while the other uses compositional PVT. The reservoir with the black-oil PVT model will be post-processed using consistent and accurate black-oil to compositional stream conversions. Stream conversion will utilize split factor tables to convert each phase volumetric rate to component molar rates. The split factors are a function of pressure and phase and are pre-generated simultaneously with the black-oil PVT tables. Streams from a ‚Äúreduced‚ÄĚ compositional PVT reservoir model are post-processed with another set of split factor tables, which are also a function of phase and pressure. This will allow the automated conversion of the reduced (or pseudoized) molar rates to equivalent ‚Äúprocess‚ÄĚ feed molar rates. The resulting comingled molar rates are delivered to the surface process simulator. An open source process simulator DWSIM¬ģ is used to model the common process facility. The sales products (gas, natural gas liquid (NGL), and oil) from the process facility model are priced in an economic model and the final results are in terms of the net present value (NPV). The optimization formulation maximizes the NPV while controlling key operating parameters of the integrated model. The approach presented in this paper can be used for integrated modeling within production sharing contracts where different companies may insist on using different reservoir simulators.

Keywords: reservoir coupling; streamz conversion; integrated model and optimization

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Development and Validation of a Thermodynamic Model for Gasification of Tyres

Author: C. Freda

Publication: Journal of Renewable and Alternative Energy Technologies, Volume 2, 2016

Abstract: A gasification model for waste tyres was developed using the commercial software DWSIM. A thermodynamic approach was adopted. The process was simulated by using air as gasifying agent. The effects of equivalence ratio and gasification temperature on the process were investigated. Equivalence ratio was varied between 0 and 1, while gasification temperature was varied between 500 and 900 ¬įC. The model predicts the following outputs of the process: yield of producer gas and char, volumetric composition and heating value of the gas. Validation with results of experimental tests was carried out to emphasize the limits of the model.

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Techno-economic optimization of ethanol synthesis from rice-straw supply chains

Authors: Yohanes Kristianto, Liandong Zhu

Title: Techno-economic optimization of ethanol synthesis from rice-straw supply chains, In Energy, 2017, , ISSN 0360-5442

Abstract: The objective of this article is to design and plan sustainable bio-ethanol supply chain. Modeling supply chains that achieve economic, social and environmental feasibility through production, process and energy efficiency is a challenge. Life cycle assessment that is coupled with techno-economic optimization of bio-ethanol supply chain is an alternative solution to achieve sustainability. A simulation of the biomass conversion is used to find process parameters of the conversion technology. The results show that the unified model is capable of minimizing both CO2 emissions and energy and utility consumptions. In addition, the supply chain is capable of contributing to local economy through jobs creation. While the model is quite comprehensive, the future research recommendation on energy integration and global sustainability is proposed.

Keywords: ethanol; LCA; optimization; techno-economic analysis; rice straws; supply chains

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Simula√ß√£o do Processo de Produ√ß√£o de Biodiesel de √ďleo de Palma utilizando os softwares Aspen HYSYS e DWSIM

Authors: Machado, N√©lio & Costa, Elin√©ia & Ara√ļjo, M.E.. (2015).


Abstract: O biodiesel √© um combust√≠vel definido na literatura como uma mistura de √©steres de √°cidos graxos derivados de fontes renov√°veis, produzido a partir da rea√ß√£o de transesterifica√ß√£o de √≥leos ou gorduras com um √°lcool mais comumente metanol ou etanol, gerando como subproduto o glicerol. Ap√≥s a rea√ß√£o de transesterifica√ß√£o ainda devem ser considerados os processos de separa√ß√£o para a recupera√ß√£o do excesso de etanol, a separa√ß√£o dos √©steres do glicerol, e a purifica√ß√£o do biodiesel propriamente dito. O uso de simuladores comerciais representam uma ferramenta de fundamental import√Ęncia para o projeto e otimiza√ß√£o de unidades de produ√ß√£o como a do biodiesel, com in√ļmeros par√Ęmetros importantes a serem definidos. Este trabalho teve como objetivo simular o processo de produ√ß√£o de Biodiesel de √≥leo de Palma utilizando dois diferentes simuladores de processos (o software comercial Aspen Hysys V8.4 e o software de interface aberta DWSIM V3.3). As simula√ß√Ķes foram realizadas sob as mesmas condi√ß√Ķes operacionais em ambos os simuladores, sendo as plantas de processo constitu√≠das da etapa de produ√ß√£o de √©steres via transesterifica√ß√£o do √≥leo de palma com etanol, e da etapa de purifica√ß√£o dos √©steres et√≠licos produzidos. Nas etapas de rea√ß√£o os dois simuladores apresentaram resultados pr√≥ximos n√£o sendo observadas diferen√ßas significativas. Nas etapas de recupera√ß√£o do etanol em excesso foram observadas diferen√ßas nos resultados referentes √†s temperaturas das correntes de fundo das colunas de destila√ß√£o. Analisando os resultados das duas simula√ß√Ķes foi poss√≠vel observar que a etapa de purifica√ß√£o e refino dos √©steres produzidos fornece resultados diferentes entre os dois simuladores. A simula√ß√£o realizada com o Aspen Hysys obteve uma corrente de biodiesel majoritariamente composta por √©ster et√≠lico (96,42%) isenta de Etanol e Glicerol, apresentando ainda tripalmitina (3,55%) e uma quantidade reduzida de √°gua (0,03%); a simula√ß√£o realizada com o DWSIM apresentou uma corrente de biodiesel composta por √©ster et√≠lico (aproximadamente 93,19 %), isenta de √°gua, contendo, ainda, etanol (0,16%), glicerol (2,02%) e tripalmitina (4,31%).

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Simulação de uma planta de produção de biodiesel

Authors: Teixeira, A.C.C.; Pereira, I.M.L.A.; Medeiros, D.; Fernandes, G.A.C.; Coelho, M.G.

Abstract: A utiliza√ß√£o de simuladores de processo se mostra eficiente para a an√°lise de processos industriais por tratar de uma ferramenta que al√©m de possibilitar a visualiza√ß√£o da planta industrial como um todo, permite tamb√©m mapear os fatores que interferem diretamente no processo. Nesse contexto, o objetivo desse trabalho √© simular a planta de produ√ß√£o de biodiesel, de forma que seja poss√≠vel obter um maior percentual de biodiesel purificado. Para isso, √© utilizado o software DWSIM e considera-se como mat√©ria-prima o √ďleo de Palma. Os resultados encontrados mostram que as composi√ß√Ķes da corrente do biodiesel final foi de 98,20% de √©ster et√≠lico, etanol (0,05%) e tripalmitina (1,74%). Portanto, a utiliza√ß√£o do simulador DWSIM √© eficaz para an√°lise deste processo produtivo.

Keywords: Simulação; DWSIM; Biodiesel

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Avaliação da Consistência de um Projeto de Amostragem Contínua em Unidade de Processamento de Gás Natural

Author: Roberto Paulo Gomes André

Abstract: Os analisadores de processos s√£o ferramentas importantes para o acompanhamento anal√≠tico em diversas ind√ļstrias e s√£o aplic√°veis √†s Unidades de Processamento de G√°s Natural para monitora√ß√£o e controle do processo. Esses instrumentos captam amostras e as condicionam para analis√°-las de forma cont√≠nua. A compatibiliza√ß√£o entre as condi√ß√Ķes f√≠sicas da amostra de processo para o analisador √© promovida por um sistema de amostragem cujo projeto engloba o dimensionamento de v√°rios itens com diferentes fun√ß√Ķes. Tal volume de especifica√ß√Ķes exige a ado√ß√£o de crit√©rios bem definidos de projeto a fim de mitigar falhas de implanta√ß√£o desses sistemas. O presente trabalho visou consolidar os crit√©rios para o dimensionamento de um sistema de amostragem e avaliar a consist√™ncia de um projeto em uma Unidade de Processamento de G√°s Natural. Mediante o conhecimento do funcionamento de uma Unidade de Processamento de G√°s Natural, da configura√ß√£o de um sistema de amostragem para an√°lise desse g√°s e da literatura t√©cnica aplic√°vel, foram elencados os itens de dimensionamento dos componentes para um sistema de amostragem, levando a elabora√ß√£o de uma lista de verifica√ß√£o de projeto. A avalia√ß√£o de consist√™ncia mostrou haver aspectos na literatura consultada com diferen√ßas significativas de especifica√ß√Ķes t√©cnicas que podem impactar as defini√ß√Ķes de projeto. A aplica√ß√£o da lista de verifica√ß√£o se mostrou eficaz para identificar falhas no projeto estudado neste trabalho, em especial o regime de fluxo, tempo espacial e condicionamento de temperatura. Como resultados, foi poss√≠vel corrigir o desempenho do sistema, adequando o tempo espacial de 89 min para 1,2 min, eliminar o risco de condensa√ß√£o da amostra no sistema e a redu√ß√£o do consumo de energia de aquecimento de 400 W para 50 W. As corre√ß√Ķes aplicadas ao sistema tornam vi√°vel a medi√ß√£o anal√≠tica proposta.

Keywords: Amostragem. G√°s natural. Analisadores de processos. Cromatografia.

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