Dielectric characterization of corn stover for microwave processing technology

Motasemi, F.; Salema, Arshad Adam; Afzal, Muhammad T.

doi:10.1016/j.fuproc.2014.12.006

Cited by 47 publications

(24 citation statements)

References 34 publications

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“…As water is a good susceptor of microwaves, a sharp decrease in dielectric properties is generally observed beyond 100 °C as water is removed. Then, dielectric properties remain virtually constant once biomass devolatilisation starts, even with an increase in temperature [62]. Char particles, which are extremely high susceptors of microwaves, are then formed at 500 -600 °C, leading to an important increase in dielectric properties at high temperatures.…”

Section: Figurementioning

confidence: 99%

Microwave pyrolysis of biomass for bio-oil production: Scalable processing concepts

Beneroso

Monti

Kostas

et al. 2017

Chemical Engineering Journal

175

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The pursuit of sustainable hydrocarbon alternatives to fossil fuels has prompted an acceleration in the development of new technologies for biomass processing.Microwave pyrolysis of biomass has long been recognised to provide better quality bio-products in shorter timescales compared to conventional pyrolysis. Although this topic has been widely assessed and many investigations are currently ongoing, this article gives an overview beyond the physico-chemical pyrolysis process and covers engineering aspects and the limitations of microwave heating technology. Herein, we provide innovative scalable concepts to perform the microwave pyrolysis of biomass on a large scale, including essential energy and material handling requirements. Furthermore, some of the possible socio-economic and environmental implications derived from the use of this technology in our society are discussed. Such potential concepts are expected to assist the needs of the industrial bioenergy community to move this largely studied process upwards in scale.

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Section: Figurementioning

confidence: 99%

Microwave pyrolysis of biomass for bio-oil production: Scalable processing concepts

Beneroso

Monti

Kostas

et al. 2017

Chemical Engineering Journal

175

View full text Add to dashboard Cite

show abstract

“…The dielectric properties of biomass component were measured using the cavity perturbation method . The size of the sample is small (∼0.1 cm 3 ), and is sensitive enough for low loss material such as biomass .…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, it is essential to determine the relation between the dielectric properties and those parameters, which is crucial for designing large scale MW systems . Several studies have attempted to characterize the dielectric properties of some types of biomass such as oil palm shell, corn stover, hay and peanut hull, but there is still a lack of fundamental information on the dielectric properties of the different components during pyrolysis. Besides, most published studies are focused solely on the dependence of dielectric properties on the frequency of radiation at room temperature and ignored the need for a comprehensive study of the whole microwave pyrolysis process .…”

Section: Introductionmentioning

confidence: 99%

Revealing low temperature microwave‐assisted pyrolysis kinetic behaviors and dielectric properties of biomass components

et al. 2018

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The kinetic characteristics of microwave-assisted pyrolysis (MAP) of biomass components were investigated in a selfdesigned microwave thermogravimetric analysis using the KAS model and the master plot method. Compared with conventional pyrolysis, the initial decomposition temperatures of biomass components were reduced by 50-1008C and the fastest weight loss regions were shifted to lower temperatures. The average apparent activation energies of cellulose, hemicellulose, and lignin were 47.82, 44.81, and 51.54 kJ/mol, respectively. Analysis with master plot method suggested the MAP of cellulose followed the 2-D diffusion reaction model, while hemicellulose and lignin could be interpreted by third orderbased and 3-D diffusion model. The change of dielectric properties was consistent with the weight loss behaviors of biomass components during the pyrolysis process. The increase of dielectric properties with temperature can lead to a thermal gradient and "hot spots" within biomass, which accelerated the pyrolysis process at low temperatures and reduced the apparent activation energy.

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“…To date, there are only a small number of publications which report the dielectric properties of a small selection of biomass types. These include sorghum [178], oil palm [179][180][181], Australian wood-based biomass [182], wood pellets [183], Tobacco stems [184], hay [185], switchgrass [186] and corn stover [187]. However, the majority of these studies have only acquired dielectric property measurement information at temperatures up to ca.…”

Section: Dielectric Properties Of Biomassmentioning

confidence: 99%

The application of microwave heating in bioenergy: A review on the microwave pre-treatment and upgrading technologies for biomass

Kostas

Beneroso

Robinson

2017

Renewable and Sustainable Energy Reviews

243

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Bioenergy, derived from biomass and/or biological (or biomass-derived) waste residues, has been acknowledged as a sustainable and clean burning source of renewable energy with the potential to reduce our reliance on fossil fuels (such as oil and natural gas). However, many bioenergy processes require some form of pre-treatment and/or upgrading procedure for biomass to generate a modified residue with more suitable properties and render it more compatible with the specific energy conversion route chosen. Many of these pre-treatments (or upgrading procedures) involve some form of substantive heating of the biomass to achieve this modification. Microwave (MW) heating has attracted much attention in recent years due to the advantages associated with dielectric heating effects. These advantages include rapid and efficient heating in a controlled environment, increasing processing rates and substantially shortening reaction times by up to 80%. However, despite this interest, the growth of industrial MW heating applications for bioenergy production has been hindered by a lack of understanding of the fundamentals of the MW heating mechanism when applied to biomass and waste residues. This article presents a review of the current scientific literature associated with the application of microwave heating for both the pre-treatment and upgrading of various biomass feedstocks across different bioenergy conversion pathways including thermal and biochemical processes. The fundamentals behind microwave heating will be explained, as well as discussion of the imperative areas which require further research and development to bridge the gap between fundamental science in the laboratory and the successful application of this technology at a commercial scale.

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Dielectric characterization of corn stover for microwave processing technology

Cited by 47 publications

References 34 publications

Microwave pyrolysis of biomass for bio-oil production: Scalable processing concepts

Microwave pyrolysis of biomass for bio-oil production: Scalable processing concepts

Revealing low temperature microwave‐assisted pyrolysis kinetic behaviors and dielectric properties of biomass components

The application of microwave heating in bioenergy: A review on the microwave pre-treatment and upgrading technologies for biomass

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