2-D Modeling of thermo-kinetics coupled with heat and mass transfer in the reduction zone of a fixed bed downdraft biomass gasifier
A two dimensional modeling is developed in the reduction zone of a fixed bed downdraft biomass gasifier based on mass, energy and momentum conservation equations written for the solid and fluid phases and coupled with chemical kinetics. Kinetics parameters are derived from previous works and an effe...
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| Published in: | Renewable energy Vol. 66; pp. 288 - 298 |
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| Main Authors: | , , , |
| Format: | Journal Article |
| Language: | English |
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01-06-2014
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| Abstract | A two dimensional modeling is developed in the reduction zone of a fixed bed downdraft biomass gasifier based on mass, energy and momentum conservation equations written for the solid and fluid phases and coupled with chemical kinetics. Kinetics parameters are derived from previous works and an effectiveness factor was used in the reaction rate correlation to quantify the mass transfer resistance in the bed. The obtained numerical results are compared with experimental and numerical data from literature and a reasonable agreement is observed. Fields of temperature, gaseous concentrations are investigated for the two-dimensional domain. Results show that the solid and fluid inlet temperatures to the reduction zone and the reactivity of the bio-char including the effectiveness factor are the main variables affecting the conversion of char to syngas in the gasification zone of the fixed bed reactor.
•Modeling of char gasification in downdraft biomass gasifier.•Modeling is based on conservation equations coupled with chemical kinetics.•2-D simulations underline the effect of kinetics and the transport phenomena on the conversion.•Temperature and char reactivity are the main parameters influencing char gasification. |
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| AbstractList | A two dimensional modeling is developed in the reduction zone of a fixed bed downdraft biomass gasifier based on mass, energy and momentum conservation equations written for the solid and fluid phases and coupled with chemical kinetics. Kinetics parameters are derived from previous works and an effectiveness factor was used in the reaction rate correlation to quantify the mass transfer resistance in the bed. The obtained numerical results are compared with experimental and numerical data from literature and a reasonable agreement is observed. Fields of temperature, gaseous concentrations are investigated for the two-dimensional domain. Results show that the solid and fluid inlet temperatures to the reduction zone and the reactivity of the bio-char including the effectiveness factor are the main variables affecting the conversion of char to syngas in the gasification zone of the fixed bed reactor.
•Modeling of char gasification in downdraft biomass gasifier.•Modeling is based on conservation equations coupled with chemical kinetics.•2-D simulations underline the effect of kinetics and the transport phenomena on the conversion.•Temperature and char reactivity are the main parameters influencing char gasification. A two dimensional modeling is developed in the reduction zone of a fixed bed downdraft biomass gasifier based on mass, energy and momentum conservation equations written for the solid and fluid phases and coupled with chemical kinetics. Kinetics parameters are derived from previous works and an effectiveness factor was used in the reaction rate correlation to quantify the mass transfer resistance in the bed. The obtained numerical results are compared with experimental and numerical data from literature and a reasonable agreement is observed. Fields of temperature, gaseous concentrations are investigated for the two-dimensional domain. Results show that the solid and fluid inlet temperatures to the reduction zone and the reactivity of the bio-char including the effectiveness factor are the main variables affecting the conversion of char to syngas in the gasification zone of the fixed bed reactor. |
| Author | Halouani, Kamel Grioui, Najla Masmoudi, Mohamed Ali Sahraoui, Melik |
| Author_xml | – sequence: 1 givenname: Mohamed Ali surname: Masmoudi fullname: Masmoudi, Mohamed Ali organization: UR: Micro Electro Thermal Systems-ENIS, IPEIS, University of Sfax, B.P: 1172-3018 Sfax, Tunisia – sequence: 2 givenname: Melik surname: Sahraoui fullname: Sahraoui, Melik organization: LASMAP, Polytechnic Engineering School of Tunis, University of Carthage, La Marsa, Tunis, Tunisia – sequence: 3 givenname: Najla surname: Grioui fullname: Grioui, Najla organization: UR: Micro Electro Thermal Systems-ENIS, IPEIS, University of Sfax, B.P: 1172-3018 Sfax, Tunisia – sequence: 4 givenname: Kamel orcidid: 0000-0002-7819-4859 surname: Halouani fullname: Halouani, Kamel email: kamel.halouani@ipeis.rnu.tn, kamel_ipeis@yahoo.fr organization: UR: Micro Electro Thermal Systems-ENIS, IPEIS, University of Sfax, B.P: 1172-3018 Sfax, Tunisia |
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| Keywords | Fixed bed downdraft gasifier Gasification Biomass Kinetics Heat and mass transfer Modeling Renewable energy |
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| SubjectTerms | Applied sciences Biomass Downdraft Energy Exact sciences and technology Fixed bed downdraft gasifier Fluid flow Fluids Gasification Heat and mass transfer Kinetics Mass transfer Mathematical analysis Mathematical models Modeling Natural energy Reduction |
| Title | 2-D Modeling of thermo-kinetics coupled with heat and mass transfer in the reduction zone of a fixed bed downdraft biomass gasifier |
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