Analytical study of transient counter-flow non-premixed combustion of biomass in presence of thermal radiation

Farahani, Moein Farmahini; Akbari, Shahin; Sadeghi, Sadegh; Bidabadi, Mehdi; Moghadam, Mohammadamir Ghasemian; Xu, Fei

doi:10.1016/j.renene.2020.05.056

Cited by 11 publications

(2 citation statements)

References 27 publications

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“…In the above equations, D c represents Damkohler number, which can be formulated in accordance with the following expression (Farahani et al , 2020): …”

Section: Mathematical Modelingmentioning

confidence: 99%

Mathematical modeling of the production of magnetic nanoparticles through counter-flow non-premixed combustion for biomedical applications

Akbari

Hasanvand

Sadeghi

et al. 2021

HFF

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Purpose The widespread usage of magnetic nanoparticles (MNPs) requires their efficient synthesis during combustion process. This study aims to present a mathematical model for the oxidation of MNPs in a counter-flow non-premixed combustion system to produce MNPs, where the key sub-processes during the oxidation reaction are involved. Design/methodology/approach To accurately describe structure of flame and determine distributions of temperature and mass fractions of both reactants and products, equations of energy and mass conservations were solved based on the prevailing assumptions that three regions, i.e. preheating, reaction and oxidizer zones exist. Findings The numerical simulation was first validated against experimental data and characteristics of the combustion process are discussed. Eventually, the influences of crucial parameters such as reactant Lewis numbers, strain rate ratio, particle size, inert gas and thermophoretic force on structure of flame and combustion behavior were examined. The results show that maximum flame temperature can achieve 2,205 K. Replacing nitrogen with argon and helium as carrier gases can increase flame temperature by about 27% and 34%, respectively. Additionally, maximum absolute thermophoretic force was found at approximately 9.6 × 10–8 N. Originality/value To the best of authors’ knowledge, this is the first time to numerically model the preparation of MNPs in a counter-flow non-premixed combustion configuration, which can guide large-scale experimental work in a more effective way.

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“…In the above equations, D c represents Damkohler number, which can be formulated in accordance with the following expression (Farahani et al , 2020): …”

Section: Mathematical Modelingmentioning

confidence: 99%

Mathematical modeling of the production of magnetic nanoparticles through counter-flow non-premixed combustion for biomedical applications

Akbari

Hasanvand

Sadeghi

et al. 2021

HFF

Self Cite

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“…In recent years, the effective use of fossil fuels and diversification of fuels have become important concerns due to problems such as depletion of fossil fuels, global warming, and the nuclear accident during the Great East Japan Earthquake. Extensive global research has been conducted to expand the use of low-grade fuels such as brown coal − and carbon-neutral fuels, such as biomass − and biofuels. − Among these next-generation fuels, biogas has received particular interest. − Biogas is a carbon-neutral fuel produced by methane fermentation of food waste, livestock manure, sewage sludge, etc., and CO 2 generated by biogas combustion is not counted as a greenhouse gas. However, the flame stability of biogas is low because biogas is composed of ∼60% CH 4 and ∼40% CO 2 , and its calorific value is very low.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nozzle Shape on Partial Oxidation Reforming of Biogas Using Microwave Plasma

et al. 2021

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Biogas, composed of ∼60% CH 4 and ∼40% CO 2 , is a carbon-neutral fuel but suffers from low flame stability. Thus, for effective utilization, the combustion reaction must be enhanced or biogas must be upgraded. Herein, microwave plasma-assisted combustion was utilized for partial oxidation reforming of biogas to enhance the reforming reaction and to upgrade biogas. The characteristics of the biogas reforming process and effects of the nozzle shape were investigated using four different nozzles. The small thin nozzle suppressed microwave attenuation to the greatest extent and thus most effectively promoted the reforming reaction. Microwave plasma not only reformed CH 4 into H 2 and CO but also decomposed CO 2 (which does not have any calorific value) into CO (which has calorific value); thus, the maximum cold gas efficiency achieved with the small thin nozzle was 112.7%, and the biogas was upgraded. Biogas reforming using O 2 as an oxidizer was also evaluated to improve the cold gas efficiency, but the cold gas efficiency undesirably decreased in this reaction relative to that using air with N 2 as the oxidizer because the reforming reactions are enhanced by increasing the active radicals like H and OH in the latter.

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Evaluation of thermal radiation and Lewis number effects on oscillatory thermal-diffusive instabilities of counterflow premixed flame fed with moisty biomass particles

Farmahini Farahani,

Akbari,

Hosseinzadeh

2024

Case Studies in Thermal Engineering

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Analytical study of transient counter-flow non-premixed combustion of biomass in presence of thermal radiation

Cited by 11 publications

References 27 publications

Mathematical modeling of the production of magnetic nanoparticles through counter-flow non-premixed combustion for biomedical applications

Mathematical modeling of the production of magnetic nanoparticles through counter-flow non-premixed combustion for biomedical applications

Influence of Nozzle Shape on Partial Oxidation Reforming of Biogas Using Microwave Plasma

Evaluation of thermal radiation and Lewis number effects on oscillatory thermal-diffusive instabilities of counterflow premixed flame fed with moisty biomass particles

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