The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Foued Halouani - One of the best experts on this subject based on the ideXlab platform.
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Thermochemical modeling of isothermal carbonization of thick wood particle – Effect of Reactor Temperature and wood particle size
Energy Conversion and Management, 2007Co-Authors: Najla Grioui, Kamel Halouani, André Zoulalian, Foued HalouaniAbstract:A numerical study of isothermal carbonization of thick wood particles has been developed. The proposed model takes into account the heat and mass transfer and chemical kinetics simultaneously. The thermal properties of wood are considered to be linear functions of the local Temperature and have been estimated from literature data or by fitting the model with experimental data. The carbonization process has been described by a kinetic scheme based on a two stage semi-global kinetic model developed in a previous work of the authors. The mathematical formulation leads to a coupled nonlinear partial differential equations system, which has been solved iteratively by an implicit finite differences method. The residual mass as well as the Temperature profile inside the thick particle are predicted numerically. The obtained results are in good agreement with the available experimental data. Then, the model is used to study the effect of Reactor Temperature and particle size on the evolution of the local Temperature and mass loss inside the wood particle.
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Thermochemical modeling of isothermal carbonization of thick wood particle - Effect of Reactor Temperature and wood particle size
Energy Conversion and Management, 2007Co-Authors: Najla Grioui, Kamel Halouani, André Zoulalian, Foued HalouaniAbstract:A numerical study of isothermal carbonization of thick wood particles has been developed. The proposed model takes into account the heat and mass transfer and chemical kinetics simultaneously. The thermal properties of wood are considered to be linear functions of the local Temperature and have been estimated from literature data or by fitting the model with experimental data. The carbonization process has been described by a kinetic scheme based on a two stage semi-global kinetic model developed in a previous work of the authors. The mathematical formulation leads to a coupled nonlinear partial differential equations system, which has been solved iteratively by an implicit finite differences method. The residual mass as well as the Temperature profile inside the thick particle are predicted numerically. The obtained results are in good agreement with the available experimental data. Then, the model is used to study the effect of Reactor Temperature and particle size on the evolution of the local Temperature and mass loss inside the wood particle.
Najla Grioui - One of the best experts on this subject based on the ideXlab platform.
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Thermochemical modeling of isothermal carbonization of thick wood particle – Effect of Reactor Temperature and wood particle size
Energy Conversion and Management, 2007Co-Authors: Najla Grioui, Kamel Halouani, André Zoulalian, Foued HalouaniAbstract:A numerical study of isothermal carbonization of thick wood particles has been developed. The proposed model takes into account the heat and mass transfer and chemical kinetics simultaneously. The thermal properties of wood are considered to be linear functions of the local Temperature and have been estimated from literature data or by fitting the model with experimental data. The carbonization process has been described by a kinetic scheme based on a two stage semi-global kinetic model developed in a previous work of the authors. The mathematical formulation leads to a coupled nonlinear partial differential equations system, which has been solved iteratively by an implicit finite differences method. The residual mass as well as the Temperature profile inside the thick particle are predicted numerically. The obtained results are in good agreement with the available experimental data. Then, the model is used to study the effect of Reactor Temperature and particle size on the evolution of the local Temperature and mass loss inside the wood particle.
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Thermochemical modeling of isothermal carbonization of thick wood particle - Effect of Reactor Temperature and wood particle size
Energy Conversion and Management, 2007Co-Authors: Najla Grioui, Kamel Halouani, André Zoulalian, Foued HalouaniAbstract:A numerical study of isothermal carbonization of thick wood particles has been developed. The proposed model takes into account the heat and mass transfer and chemical kinetics simultaneously. The thermal properties of wood are considered to be linear functions of the local Temperature and have been estimated from literature data or by fitting the model with experimental data. The carbonization process has been described by a kinetic scheme based on a two stage semi-global kinetic model developed in a previous work of the authors. The mathematical formulation leads to a coupled nonlinear partial differential equations system, which has been solved iteratively by an implicit finite differences method. The residual mass as well as the Temperature profile inside the thick particle are predicted numerically. The obtained results are in good agreement with the available experimental data. Then, the model is used to study the effect of Reactor Temperature and particle size on the evolution of the local Temperature and mass loss inside the wood particle.
Kamel Halouani - One of the best experts on this subject based on the ideXlab platform.
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Thermochemical modeling of isothermal carbonization of thick wood particle – Effect of Reactor Temperature and wood particle size
Energy Conversion and Management, 2007Co-Authors: Najla Grioui, Kamel Halouani, André Zoulalian, Foued HalouaniAbstract:A numerical study of isothermal carbonization of thick wood particles has been developed. The proposed model takes into account the heat and mass transfer and chemical kinetics simultaneously. The thermal properties of wood are considered to be linear functions of the local Temperature and have been estimated from literature data or by fitting the model with experimental data. The carbonization process has been described by a kinetic scheme based on a two stage semi-global kinetic model developed in a previous work of the authors. The mathematical formulation leads to a coupled nonlinear partial differential equations system, which has been solved iteratively by an implicit finite differences method. The residual mass as well as the Temperature profile inside the thick particle are predicted numerically. The obtained results are in good agreement with the available experimental data. Then, the model is used to study the effect of Reactor Temperature and particle size on the evolution of the local Temperature and mass loss inside the wood particle.
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Thermochemical modeling of isothermal carbonization of thick wood particle - Effect of Reactor Temperature and wood particle size
Energy Conversion and Management, 2007Co-Authors: Najla Grioui, Kamel Halouani, André Zoulalian, Foued HalouaniAbstract:A numerical study of isothermal carbonization of thick wood particles has been developed. The proposed model takes into account the heat and mass transfer and chemical kinetics simultaneously. The thermal properties of wood are considered to be linear functions of the local Temperature and have been estimated from literature data or by fitting the model with experimental data. The carbonization process has been described by a kinetic scheme based on a two stage semi-global kinetic model developed in a previous work of the authors. The mathematical formulation leads to a coupled nonlinear partial differential equations system, which has been solved iteratively by an implicit finite differences method. The residual mass as well as the Temperature profile inside the thick particle are predicted numerically. The obtained results are in good agreement with the available experimental data. Then, the model is used to study the effect of Reactor Temperature and particle size on the evolution of the local Temperature and mass loss inside the wood particle.
André Zoulalian - One of the best experts on this subject based on the ideXlab platform.
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Thermochemical modeling of isothermal carbonization of thick wood particle – Effect of Reactor Temperature and wood particle size
Energy Conversion and Management, 2007Co-Authors: Najla Grioui, Kamel Halouani, André Zoulalian, Foued HalouaniAbstract:A numerical study of isothermal carbonization of thick wood particles has been developed. The proposed model takes into account the heat and mass transfer and chemical kinetics simultaneously. The thermal properties of wood are considered to be linear functions of the local Temperature and have been estimated from literature data or by fitting the model with experimental data. The carbonization process has been described by a kinetic scheme based on a two stage semi-global kinetic model developed in a previous work of the authors. The mathematical formulation leads to a coupled nonlinear partial differential equations system, which has been solved iteratively by an implicit finite differences method. The residual mass as well as the Temperature profile inside the thick particle are predicted numerically. The obtained results are in good agreement with the available experimental data. Then, the model is used to study the effect of Reactor Temperature and particle size on the evolution of the local Temperature and mass loss inside the wood particle.
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Thermochemical modeling of isothermal carbonization of thick wood particle - Effect of Reactor Temperature and wood particle size
Energy Conversion and Management, 2007Co-Authors: Najla Grioui, Kamel Halouani, André Zoulalian, Foued HalouaniAbstract:A numerical study of isothermal carbonization of thick wood particles has been developed. The proposed model takes into account the heat and mass transfer and chemical kinetics simultaneously. The thermal properties of wood are considered to be linear functions of the local Temperature and have been estimated from literature data or by fitting the model with experimental data. The carbonization process has been described by a kinetic scheme based on a two stage semi-global kinetic model developed in a previous work of the authors. The mathematical formulation leads to a coupled nonlinear partial differential equations system, which has been solved iteratively by an implicit finite differences method. The residual mass as well as the Temperature profile inside the thick particle are predicted numerically. The obtained results are in good agreement with the available experimental data. Then, the model is used to study the effect of Reactor Temperature and particle size on the evolution of the local Temperature and mass loss inside the wood particle.
Dolores Kukanja - One of the best experts on this subject based on the ideXlab platform.
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Modelling and simulation of semi-batch polymerisation Reactor for improved reactants dosing control
Simulation Modelling Practice and Theory, 2013Co-Authors: Nadja Hvala, Dolores KukanjaAbstract:Abstract This paper presents a Temperature model of an industrial, semi-batch, emulsion-polymerisation Reactor, which together with the already designed chemical reactions model is able to predict the Temperature in the Reactor as a result of varying operating conditions. The model was derived from the energy balance equations and validated on real-plant data. The model was used to analyse the influence of reactants dosing during the batch on the Reactor Temperature. The analysis shows that during the batch dosing of the two reactants, initiator and monomer, needs to be mutually balanced and adjusted to the current process situation, otherwise, the Temperature in the Reactor may become oscillatory and unstable towards the end of the batch because of the limited heat removal capacity of the condenser. To keep the Reactor Temperature in a narrow region also the control strategy was proposed that adjusts the monomer flow and initiator addition, using Reactor Temperature as a controlled variable. Simulation results show that the proposed reactants dosing control significantly reduces the variations in the Reactor Temperature and at the same time results in more uniform final batch results.
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Modelling, simulation and control of an industrial, semi-batch, emulsion-polymerization Reactor
Computers & Chemical Engineering, 2011Co-Authors: Nadja Hvala, Fernando Aller, Teodora Miteva, Dolores KukanjaAbstract:Abstract This paper presents an emulsion-polymerization model that is designed for an industrial, semi-batch Reactor. The model consists of a reaction model and a calorimetry model, and as such enables us to predict the Reactor Temperature and the batch-output parameters, i.e., the conversion, the solids content and the viscosity. The model was validated on real-plant data and used in the analysis and design of the reactants dosing control. The control strategy proposed is valid for cases where evaporative cooling is either the only or an additional way to remove the heat of the reaction. It consists of an initiator and monomer dosing control, using the Reactor Temperature as a controlled variable. The simulation results and the real-plant testing show that the proposed reactants dosing control significantly reduces the variations in the Reactor Temperature and at the same time results in more uniform batch results.
