Article
Chemistry, Applied
Ljubisa Gavrilovic, Erik A. Jorgensen, Umesh Pandey, Koteswara R. Putta, Kumar R. Rout, Erling Rytter, Magne Hillestad, Edd A. Blekkan
Summary: Fischer-Tropsch synthesis has been investigated over a commercial cobalt-based catalyst, showing a positive effect of water on catalyst activity and increased C(5+) selectivity regardless of the H2/CO ratio. Increasing conversion led to increased C(5+) selectivity, while higher conversions resulted in significantly enhanced selectivity to CO2.
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Review
Green & Sustainable Science & Technology
Zahra Teimouri, Venu Babu Borugadda, Ajay K. Dalai, Nicolas Abatzoglou
Summary: The increasing global energy demand has led to the search for renewable and clean energy resources. Fischer-Tropsch synthesis (FTS) is a method that converts syngas to hydrocarbons, offering an attractive and sustainable energy source. However, the complexity of FTS involving fluid dynamics and reaction kinetics presents challenges. Computational fluid dynamics (CFD) helps in understanding the fluid dynamics within FTS reactors and optimizing operating conditions for improved efficiency. This review analyzes the capabilities of CFD simulation in predicting FTS performance in different reactor types and addresses current challenges.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Engineering, Chemical
Jianqi Shen, Yun-Chao Li, Wei H. Ho, Xinying Liu, Diane Hildebrandt
Summary: The temperature distribution in a bench-scale fixed bed Fischer-Tropsch reactor using Co-based catalyst was investigated. A 2D pseudo-homogeneous fixed bed reactor model was developed to predict temperature more accurately, and analyze how to increase reactor production capacity.
Article
Engineering, Environmental
V. Chandra, D. Vogels, E. A. J. F. Peters, J. A. M. Kuipers
Summary: A numerical model based on fundamental continuum transport equations has been developed for simulating the Fischer-Tropsch synthesis in a slender packed column, considering internal and external mass transport limitations and a two-way coupling between mass and heat transport. The model uses a Langmuir-Hinshelwood type kinetic model for the reaction rate and employs the Immersed Boundary Method for fluid phase transport coupling. The influence of temperature and concentration on conversion and selectivity is investigated in a fixed bed reactor consisting of randomly packed particles using the Discrete Element Method.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Chemical
Zahra Gholami, Zdenek Tisler, Josef Simek
Summary: Fischer-Tropsch synthesis is a widely recognized process for converting syngas into higher hydrocarbons and oxygenates. The use of a multilayered catalytic bed has shown positive effects in addressing temperature control and heat dissipation, as well as underutilization of the catalyst bed in fixed-bed reactors.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Engineering, Chemical
Arash Yahyazadeh, Somaye Seraj, Philip Boahene, Ajay K. Dalai
Summary: This study evaluated the performance of Fe catalysts in Fischer-Tropsch synthesis and compared DOE 2 and DOE 5 catalysts. The results showed that DOE 2 had higher C2-C4 selectivity, while DOE 5 had higher C5+ selectivity. In addition, COMSOL Multiphysics software was used to simulate FTS fixed-bed reactor and was validated with experimental data.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Multidisciplinary Sciences
Cesar I. Mendez, Fernando Trejo, Jorge Ancheyta
Summary: A control scheme was developed for a fixed-bed Fischer-Tropsch synthesis reactor to optimize its performance, with the use of optimal initial operating conditions and dynamic control strategies to ensure efficient operation.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Chemical
Zoe A. Pollard, Andrew Cannon, Emily M. Ryan, Jillian L. Goldfarb
Summary: This study investigates the variability of small-scale adsorption systems and proposes improvements for small-scale experiments using a combination of experimental results and CFD simulations.
Article
Chemistry, Applied
Gi Hoon Hong, Dongil Shin, Dong Ju Moon
Summary: The catalyst bed for Fischer-Tropsch Synthesis reactor was prepared using a mixture of Ru/Co/Al2O3 catalyst and dilution materials with different thermal conductivity. The effect of dilution materials on controlling the reaction heat was investigated in a shell and tube type fixed bed reactor with an oil circulation system. It was found that lower thermal conductivity of the dilution materials stabilized the reactivity of the FTS reactor at relatively low temperatures.
Article
Energy & Fuels
Serena Poto, Fausto Gallucci, M. Fernanda Neira d'Angelo
Summary: The direct hydrogenation of CO2 to dimethyl ether (DME) is a promising technology, and a 1D phenomenological reactor model was developed to optimize membrane reactor performance for this conversion. The study found that the circulation of a sweep gas stream through the permeation zone increased overall DME yield, and determined optimal membrane properties for reactor performance, considering non-ideal separation and non-isothermal operation. The membrane reactor demonstrated higher water removal efficiency and improved CO2 conversion and DME yield compared to a conventional packed bed, showing promising potential for CO2 valorisation.
Review
Engineering, Chemical
Frank Sauerhofer-Rodrigo, Ismael Diaz, Manuel Rodriguez, Ponciano Perez
Summary: This work presents an extensive review of steady state models for Fischer-Tropsch synthesis in slurry bubble column reactors and fixed bed reactors. Material, energy, and momentum balance equations are presented, along with the relevant findings of each study for modelling purposes. Different types of models, such as one-dimensional and two-dimensional models for fixed bed reactors, and single-class and double-class bubble models for slurry bubble column reactors, are discussed, highlighting their advantages and computational efforts.
REVIEWS IN CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Shaghayegh Jamshidi, Mohammad Hadi Sedaghat, Ali Amini, Mohammad Reza Rahimpour
Summary: In this study, a steady-state Computational Fluid Dynamics (CFD) model was used to simulate a packed bed reactor for methanol production from natural gas. The model predicted the behavior of gas streams in the reactor tube by accounting for axial and radial dispersion with two-dimensional mass and heat transport equations. A sensitivity analysis was conducted to examine the impact of various parameters on the rate of methanol production in an industrial petrochemical plant. The results showed that shell temperature, operating pressure, flow rate, and carbon source significantly influenced methanol production, while tube length and diameter had little effect.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Engineering, Chemical
Anthony G. Dixon
Summary: Particle-resolved computational fluid dynamics simulations in fixed beds of spheres show poor accuracy at higher Reynolds number under turbulent conditions. Different meshing techniques and boundary adaption can improve results and reduce cost. Accuracy for pressure drop requires computationally expensive fine uniform meshes, but velocity profiles are less sensitive to mesh refinement and can be obtained at reasonable cost.
Article
Engineering, Chemical
Anthony G. Dixon
Summary: The study conducted particle-resolved 3-D computational fluid dynamics simulations of highly exothermic ethylene partial oxidation in a fixed bed to evaluate heterogeneous pseudo continuum reaction engineering models. The results showed differences in comparison to a previous study on endothermic steam methane reforming. Adjusting and improving the reactor models can enhance the accuracy of simulation results.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Chemical
Mohammad Reza Sardashti Birjandi, Farhad Shahraki, Kiyanoosh Razzaghi
CHEMICAL ENGINEERING & TECHNOLOGY
(2019)
Article
Chemistry, Physical
Sara Mousavi, Farhad Shahraki, Majid Aliabadi, Aminoddin Haji, Fabian Deuber, Christian Adlhart
APPLIED SURFACE SCIENCE
(2019)
Article
Automation & Control Systems
Shahin Kharaji, Jafar Sadeghi, Farhad Shahraki, Mir Mohammad Khalilipour
Article
Automation & Control Systems
Roja Parvizi Moghadam, Jafar Sadeghi, Farhad Shahraki
OPTIMAL CONTROL APPLICATIONS & METHODS
(2020)
Article
Chemistry, Applied
Abbas Deriszadeh, Farhad Shahraki, Davood Mohebbi Kalhori, Omid Moini Jazani
PROGRESS IN ORGANIC COATINGS
(2019)
Article
Engineering, Chemical
Hassan Mahmoodi, Kiyanoosh Razzaghi, Farhad Shahraki
Article
Chemistry, Physical
A. Zangeneh, S. M. Peyghambarzadeh, A. Bayat, A. Vatani
JOURNAL OF MOLECULAR LIQUIDS
(2020)
Article
Thermodynamics
Tahereh Yazdanipour, Farhad Shahraki, Davod Mohebbi-Kalhori
Summary: This paper investigates the influence of wind direction and speed on the performance of a solar cavity receiver. The results show that wind direction and speed have a significant impact on heat losses, particularly at different inclinations. In most cases, head-on wind results in higher convection heat loss compared to other wind directions.
EXPERIMENTAL HEAT TRANSFER
(2022)
Article
Energy & Fuels
Ramin Zarei, Kiyanoosh Razzaghi, Farhad Shahraki
Summary: This experimental study focused on heat transfer enhancement in laminar flow using different blade crossing angles of mixers in a tube. Results revealed that the 90 degrees blade mixer provided higher Nusselt numbers compared to the 120 degrees mixer, with higher pressure drop as a trade-off. Moreover, the heat transfer enhancement was correlated with the Graetz number, showing that heat transfer effects significantly dominated pressure drop effects.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Article
Biotechnology & Applied Microbiology
M. Sinaei Nobandegani, T. Darbandi, M. Kheirinik, M. R. Sardashti Birjandi, F. Shahraki, L. Yu
Summary: Steam methane reforming is a promising process to convert natural gas into hydrogen. In this study, a one-dimensional model was used to simulate and optimize an industrial steam methane reformer, with multiobjective optimization done using genetic algorithm, resulting in an optimal feed flowrate of 2761.9 kmol/h.
CHEMICAL AND BIOCHEMICAL ENGINEERING QUARTERLY
(2021)
Article
Engineering, Electrical & Electronic
Fereshte Tavakoli Dastjerd, Jafar Sadeghi, Farhad Shahraki, Mir Mohammad Khalilipour, Bahareh Bidar
Summary: This paper proposes a new soft sensor modeling method (GRW-MSDP) based on a generalized random walk model, which allows for robust estimation of parameters in the presence of outliers and missing data. The method utilizes the Kalman filter and fixed-interval smoothing algorithms to estimate the model parameters. The main advantage of the GRW-MSDP method is that it does not require data pre-processing and can effectively handle non-linearity in the process and missing values in the time series data.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Chemical
Samane Hamzekhani, Mohammad Reza Sardashti Birjandi, Farhad Shahraki
Summary: This study focuses on predicting boiling heat transfer in pool boiling systems, with a particular emphasis on bubble detachment diameters in different systems. By applying response surface methodology, the effects of liquid and vapor density on bubble detachment diameters were analyzed for ethanol, methanol, water, Na2SO4-water, and NaCl-water systems. The regression models obtained showed good agreement with experimental data for estimating bubble detachment diameters.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Esmaeil Koohestanian, Jafar Sadeghi, Mohebbi Davod Kalhori, Farhae Shahraki, Abdolreza Samimi
Summary: This study presents a novel process flowsheet for CO2 compression and purification unit, reducing the number of cold-boxes to lower investment costs and improve energy integration. The proposed flowsheet operates at lower pressure and requires smaller heat-transfer area than other options. The simplified control loops utilizing P and PI controllers offer performance advantages.
IRANIAN JOURNAL OF CHEMISTRY & CHEMICAL ENGINEERING-INTERNATIONAL ENGLISH EDITION
(2021)
Review
Engineering, Environmental
Esmaeil Koohestanian, Farhad Shahraki
Summary: This study reviews the principles and latest advances of the CO2CPU process, as well as the potential challenges this process may face in the future, including technological, economical, and legal aspects.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Thermodynamics
Tahereh Yazdanipour, Farhad Shahraki, Davood Mohebbi Kalhori
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2020)
