TY  - JOUR
AU  - Mandić, Miloš
AU  - Dikić, Vladimir
AU  - Petkovska, Menka
AU  - Todić, Branislav
AU  - Bukur, Dragomir B.
AU  - Nikačević, Nikola
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3846
AB  - Dynamic performance of a milli-scale fixed bed reactor for Fischer-Tropsch synthesis (FTS) was studied using a dynamic pseudo-homogeneous 1D reactor model. The model uses detailed kinetics to describe the rates of FTS product formation. Dynamic responses of the process variables and main performance indicators, including productivity of C-5(+) hydrocarbons and CH4 selectivity, to input step changes, were analyzed. Total of 7 inlet variables were used in step-change-response analysis, with different magnitudes of change and for two initial steady-state conditions. Reactor simulations show highly nonlinear behavior due to phenomena coupling and fast dynamics due to system small scale and intensified rates within. In addition, reactor model shows instability related to thermal runaway with certain magnitudes of step change of coolant temperature and feed flow rate. The analysis outlines the effects of potential process disturbances on operation of milli-scale fixed bed reactor for FTS and provides general guidelines for control systems.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Chemical Engineering Science
T1  - Dynamic analysis of millimetre-scale fixed bed reactors for Fischer-Tropsch synthesis
EP  - 447
SP  - 434
VL  - 192
DO  - 10.1016/j.ces.2018.07.052
ER  - 

@article{
author = "Mandić, Miloš and Dikić, Vladimir and Petkovska, Menka and Todić, Branislav and Bukur, Dragomir B. and Nikačević, Nikola",
year = "2018",
abstract = "Dynamic performance of a milli-scale fixed bed reactor for Fischer-Tropsch synthesis (FTS) was studied using a dynamic pseudo-homogeneous 1D reactor model. The model uses detailed kinetics to describe the rates of FTS product formation. Dynamic responses of the process variables and main performance indicators, including productivity of C-5(+) hydrocarbons and CH4 selectivity, to input step changes, were analyzed. Total of 7 inlet variables were used in step-change-response analysis, with different magnitudes of change and for two initial steady-state conditions. Reactor simulations show highly nonlinear behavior due to phenomena coupling and fast dynamics due to system small scale and intensified rates within. In addition, reactor model shows instability related to thermal runaway with certain magnitudes of step change of coolant temperature and feed flow rate. The analysis outlines the effects of potential process disturbances on operation of milli-scale fixed bed reactor for FTS and provides general guidelines for control systems.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Chemical Engineering Science",
title = "Dynamic analysis of millimetre-scale fixed bed reactors for Fischer-Tropsch synthesis",
pages = "447-434",
volume = "192",
doi = "10.1016/j.ces.2018.07.052"
}

Mandić, M., Dikić, V., Petkovska, M., Todić, B., Bukur, D. B.,& Nikačević, N.. (2018). Dynamic analysis of millimetre-scale fixed bed reactors for Fischer-Tropsch synthesis. in Chemical Engineering Science
Pergamon-Elsevier Science Ltd, Oxford., 192, 434-447.
https://doi.org/10.1016/j.ces.2018.07.052

Mandić M, Dikić V, Petkovska M, Todić B, Bukur DB, Nikačević N. Dynamic analysis of millimetre-scale fixed bed reactors for Fischer-Tropsch synthesis. in Chemical Engineering Science. 2018;192:434-447.
doi:10.1016/j.ces.2018.07.052 .

Mandić, Miloš, Dikić, Vladimir, Petkovska, Menka, Todić, Branislav, Bukur, Dragomir B., Nikačević, Nikola, "Dynamic analysis of millimetre-scale fixed bed reactors for Fischer-Tropsch synthesis" in Chemical Engineering Science, 192 (2018):434-447,
https://doi.org/10.1016/j.ces.2018.07.052 . .

TY  - JOUR
AU  - Stamenić, Marko
AU  - Dikić, Vladimir
AU  - Mandić, Miloš
AU  - Todić, Branislav
AU  - Bukur, Dragomir B.
AU  - Nikačević, Nikola
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3964
AB  - Our previously developed mathematical model is used for parametric sensitivity and optimization study of conventional and milliscale fixed-bed reactors (FBRs) for Fischer-Tropsch synthesis (FTS). Five indicators are chosen to analyze the influence of eight parameters on the FBRs performance. The results show the scale of the effects caused by changing single parameter values and highlight the most important ones. Subsequently, the model is used to perform a rigorous multivariable optimization of the FBRs performance in the steady state. Three optimization functions are used, depicting different reactor costs. Four design parameters (tube length and diameter, particle diameter, and catalyst layer thickness) and five operating parameters (inlet and wall temperature, inlet pressure, H-2/CO ratio, velocity) are optimized simultaneously. The results indicate that optimal results, in terms of reactor design and operating parameters and FBR performance, highly depend on the selected objective function and values of constrained parameters (especially methane selectivity and the partial pressure of water).
PB  - Amer Chemical Soc, Washington
T2  - Industrial & Engineering Chemistry Research
T1  - Multiscale and Multiphase Model of Fixed-Bed Reactors for Fischer-Tropsch Synthesis: Optimization Study
EP  - 3162
IS  - 9
SP  - 3149
VL  - 57
DO  - 10.1021/acs.iecr.7b04914
ER  - 

@article{
author = "Stamenić, Marko and Dikić, Vladimir and Mandić, Miloš and Todić, Branislav and Bukur, Dragomir B. and Nikačević, Nikola",
year = "2018",
abstract = "Our previously developed mathematical model is used for parametric sensitivity and optimization study of conventional and milliscale fixed-bed reactors (FBRs) for Fischer-Tropsch synthesis (FTS). Five indicators are chosen to analyze the influence of eight parameters on the FBRs performance. The results show the scale of the effects caused by changing single parameter values and highlight the most important ones. Subsequently, the model is used to perform a rigorous multivariable optimization of the FBRs performance in the steady state. Three optimization functions are used, depicting different reactor costs. Four design parameters (tube length and diameter, particle diameter, and catalyst layer thickness) and five operating parameters (inlet and wall temperature, inlet pressure, H-2/CO ratio, velocity) are optimized simultaneously. The results indicate that optimal results, in terms of reactor design and operating parameters and FBR performance, highly depend on the selected objective function and values of constrained parameters (especially methane selectivity and the partial pressure of water).",
publisher = "Amer Chemical Soc, Washington",
journal = "Industrial & Engineering Chemistry Research",
title = "Multiscale and Multiphase Model of Fixed-Bed Reactors for Fischer-Tropsch Synthesis: Optimization Study",
pages = "3162-3149",
number = "9",
volume = "57",
doi = "10.1021/acs.iecr.7b04914"
}

Stamenić, M., Dikić, V., Mandić, M., Todić, B., Bukur, D. B.,& Nikačević, N.. (2018). Multiscale and Multiphase Model of Fixed-Bed Reactors for Fischer-Tropsch Synthesis: Optimization Study. in Industrial & Engineering Chemistry Research
Amer Chemical Soc, Washington., 57(9), 3149-3162.
https://doi.org/10.1021/acs.iecr.7b04914

Stamenić M, Dikić V, Mandić M, Todić B, Bukur DB, Nikačević N. Multiscale and Multiphase Model of Fixed-Bed Reactors for Fischer-Tropsch Synthesis: Optimization Study. in Industrial & Engineering Chemistry Research. 2018;57(9):3149-3162.
doi:10.1021/acs.iecr.7b04914 .

Stamenić, Marko, Dikić, Vladimir, Mandić, Miloš, Todić, Branislav, Bukur, Dragomir B., Nikačević, Nikola, "Multiscale and Multiphase Model of Fixed-Bed Reactors for Fischer-Tropsch Synthesis: Optimization Study" in Industrial & Engineering Chemistry Research, 57, no. 9 (2018):3149-3162,
https://doi.org/10.1021/acs.iecr.7b04914 . .

TY  - JOUR
AU  - Stamenić, Marko
AU  - Dikić, Vladimir
AU  - Mandić, Miloš
AU  - Todić, Branislav
AU  - Bukur, Dragomir B.
AU  - Nikačević, Nikola
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3542
AB  - A multiphase fixed-bed reactor (FBR) model for Fischer Tropsch Synthesis has been developed. A high level of details is considered for description of the phenomena on the reactor and particle scale. Detailed kinetics is used, with parameters estimated from experiments with a cobalt-based catalyst. Model robustness has been validated using literature data. Performance analysis was made for a conventional scale FBR with egg-shell distribution of catalyst and a millimeter-scale FBR with small particles and uniform distribution. In both cases, diffusion limitations are almost eliminated due to use of small diffusion lengths. For similar qualitative results, a milli-scaled design would result in a significantly lower reactor volume, but the capital costs could be high due to large wall area and a vast number of tubes. Heat removal is efficient in both cases, and pressure drop in the milli-scale reactor is low due to the use of a shorter bed and lower velocity.
PB  - Amer Chemical Soc, Washington
T2  - Industrial & Engineering Chemistry Research
T1  - Multiscale and Multiphase Model of Fixed Bed Reactors for Fischer-Tropsch Synthesis: Intensification Possibilities Study
EP  - 9979
IS  - 36
SP  - 9964
VL  - 56
DO  - 10.1021/acs.iecr.7b02467
ER  - 

@article{
author = "Stamenić, Marko and Dikić, Vladimir and Mandić, Miloš and Todić, Branislav and Bukur, Dragomir B. and Nikačević, Nikola",
year = "2017",
abstract = "A multiphase fixed-bed reactor (FBR) model for Fischer Tropsch Synthesis has been developed. A high level of details is considered for description of the phenomena on the reactor and particle scale. Detailed kinetics is used, with parameters estimated from experiments with a cobalt-based catalyst. Model robustness has been validated using literature data. Performance analysis was made for a conventional scale FBR with egg-shell distribution of catalyst and a millimeter-scale FBR with small particles and uniform distribution. In both cases, diffusion limitations are almost eliminated due to use of small diffusion lengths. For similar qualitative results, a milli-scaled design would result in a significantly lower reactor volume, but the capital costs could be high due to large wall area and a vast number of tubes. Heat removal is efficient in both cases, and pressure drop in the milli-scale reactor is low due to the use of a shorter bed and lower velocity.",
publisher = "Amer Chemical Soc, Washington",
journal = "Industrial & Engineering Chemistry Research",
title = "Multiscale and Multiphase Model of Fixed Bed Reactors for Fischer-Tropsch Synthesis: Intensification Possibilities Study",
pages = "9979-9964",
number = "36",
volume = "56",
doi = "10.1021/acs.iecr.7b02467"
}

Stamenić, M., Dikić, V., Mandić, M., Todić, B., Bukur, D. B.,& Nikačević, N.. (2017). Multiscale and Multiphase Model of Fixed Bed Reactors for Fischer-Tropsch Synthesis: Intensification Possibilities Study. in Industrial & Engineering Chemistry Research
Amer Chemical Soc, Washington., 56(36), 9964-9979.
https://doi.org/10.1021/acs.iecr.7b02467

Stamenić M, Dikić V, Mandić M, Todić B, Bukur DB, Nikačević N. Multiscale and Multiphase Model of Fixed Bed Reactors for Fischer-Tropsch Synthesis: Intensification Possibilities Study. in Industrial & Engineering Chemistry Research. 2017;56(36):9964-9979.
doi:10.1021/acs.iecr.7b02467 .

Stamenić, Marko, Dikić, Vladimir, Mandić, Miloš, Todić, Branislav, Bukur, Dragomir B., Nikačević, Nikola, "Multiscale and Multiphase Model of Fixed Bed Reactors for Fischer-Tropsch Synthesis: Intensification Possibilities Study" in Industrial & Engineering Chemistry Research, 56, no. 36 (2017):9964-9979,
https://doi.org/10.1021/acs.iecr.7b02467 . .