An integrated kinetic model for downdraft gasifier based on a novel approach that optimises the reduction zone of gasifier

Salem, Ahmed M.; Paul, Manosh C.

doi:10.1016/j.biombioe.2017.12.030

Cited by 63 publications

(80 citation statements)

References 22 publications

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“…Small amounts of hydrochloric acid (HCl) and hydrogen sulfide (H 2 S) can also be found in the produced gas [37]. Gasification takes place in four phases: drying, pyrolysis, oxidation and reduction that can be described as follows [38,39]:…”

Section: Gasification Processmentioning

confidence: 99%

A Holistic Review on Biomass Gasification Modified Equilibrium Models

et al. 2019

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Biomass gasification is realized as a settled process to produce energy in a sustainable form, between all the biomass-based energy generation routes. Consequently, there are a renewed interest in biomass gasification promoting the research of different mathematical models to enlighten and comprehend gasification process complexities. This review is focused on the thermodynamic equilibrium models, which is the class of models that seems to be more developed. It is verified that the review articles available in the literature do not address non-stoichiometric methods, as well as an ambiguous categorization of stoichiometric and non-stoichiometric methods. Therefore, the main purpose of this article is to review the non-stoichiometric equilibrium models and categorize them, and review the different stoichiometric equilibrium model’s categorization available in the literature. The modeling procedures adopted for the different modeling categories are compared. Conclusion can be drawn that almost all equilibrium models are modified by the inclusion of empirical correction factors that improves the model prediction capabilities but with loss of generality.

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Section: Gasification Processmentioning

confidence: 99%

A Holistic Review on Biomass Gasification Modified Equilibrium Models

et al. 2019

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“…A typical drying kinetic model is presented in Eq. 1, where r D , A D , E D , T D and C H 2 O (l) represent the evaporation rate (kmol/m 3 .s), the pre-exponential drying factor (1/s), the activation energy of water evaporation (J/kmol), the drying temperature (K) and the water concentration (kmol/m 3 ), respectively (Salem & Paul, 2018). Constant temperature or a certain temperature profile may be used to describe the drying step.…”

Section: Drying Stepmentioning

confidence: 99%

“…Constant temperature or a certain temperature profile may be used to describe the drying step. For example, a temperature of 400K is used in the study of Salem & Paul (2018) while a temperature profile ranging from 368K to 473K is used by Dejtrakulwong & Patumsawad (2014).…”

Section: Drying Stepmentioning

confidence: 99%

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Development of a MSW Gasification Model for Flexible Integration Into a Mfa-Lca Framework

et al. 2018

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This paper presents the development of a comprehensive gasification module designed to be integrated in a MFA-LCA framework. From existing gasification models present in the literature, the most appropriate modelling strategy is selected and implemented into the module. This module needs to be able to capture the influence of input parameters, such as gasification reactor type, oxidizing agent, feedstock composition and operating conditions on the process outputs, including syngas yield, its composition and LHV, as well as tar and char contents. A typical gasification process is usually modelled in four steps: drying, pyrolysis, oxidation and reduction. Models representing each of these steps are presented in this paper. Since the type of gasification reactor is taken into account in the module, models for downdraft moving bed and bubbling fluidized bed reactor are also reviewed. The gasification module will be integrated into a MFA framework (VMR-Sys), which enables calculation of relevant gasifier feedstock parameters, such as moisture content, composition, properties and particle size distribution. Outputs from the module will also include elemental compositions obtained from VMR-Sys calculations. Finally, all outputs from the module will be used to build LCA-inventory data.

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“…On the other hand, kinetic models are used to overcome those problems and proved to be able to simulate a wider range of working parameters of a gasifier e.g. (producer gas composition, temperature distribution along gasifier, heating value and gasifier design ( [1], and [2]). Some other models were used to predict the tar formation during biomass gasification (e.g.…”

Section: Introductionmentioning

confidence: 99%

Detailed Kinetic Modelling for Tar Species Evolution in a Downdraft Gasifier

Salem¹,

paul²

2019

International Conference on Energy Harvesting, Storage, and Transfer

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Biomass is being used widely for energy production in various ways. One of the main schemes for energy production from biomass is gasification, and a powerful tool for optimising the behaviour of biomass gasifiers and also obtaining the required design for specific working conditions is the modelling. An integrated kinetic model was built by the authors ([1], and [2]), which enabled to simulate, design and optimise the processes of downdraft biomass gasifiers for the production of high quality syngas. In the current research presented in this paper, the kinetic code has been extended by including detailed chemical mechanisms for the tar evolution and formation inside the gasifier. The model incorporated the evolution of 4 main tar species from pyrolysis to combustion and gasification with the formation and kinetic reaction rates of benzene, naphthalene, toluene, and phenol tar compounds. The effect of varying moisture content (MC) and equivalence ratio (ER) is studied to find out the optimum working conditions leading to the reduction of tar amount in the producer gas from downdraft gasifiers. The results reveals that moderate ER of 0.3, with lower MC<10%, leads to the production of higher quality syngas with lower tar amounts.

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An integrated kinetic model for downdraft gasifier based on a novel approach that optimises the reduction zone of gasifier

Cited by 63 publications

References 22 publications

A Holistic Review on Biomass Gasification Modified Equilibrium Models

A Holistic Review on Biomass Gasification Modified Equilibrium Models

Development of a MSW Gasification Model for Flexible Integration Into a Mfa-Lca Framework

Detailed Kinetic Modelling for Tar Species Evolution in a Downdraft Gasifier

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