Simulation studies on microwave-assisted pyrolysis of biomass for bioenergy production with special attention on waveguide number and location

Mokhta, Zafri Mohd; Ong, Mei Yin; Salman, Bello; Nomanbhay, Saifuddin; Salleh, Siti Fatihah; Chew, Kit Wayne; Show, Pau Loke; Chen, Wei‐Hsin

doi:10.1016/j.energy.2019.116474

Cited by 37 publications

(13 citation statements)

References 22 publications

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“…In the preceding chapters, changes in electromagnetic field and heat distribution due to changes in cavity geometry were analyzed. Changing the cavity geometry and the method of using multiple waveguides has also been proposed as measures to achieve uniform and high-efficiency heating [21]. Most studies, however, focused on the application of multiple waveguides to the fixed cavity, but studies on the influence of detailed cavity design parameters, such as the position, port direction, and power, on the electromagnetic field distribution and heating effect, are insufficient and remain on a laboratory Therefore, waveguides were additionally installed in the cavity of various geometries, and the temperature uniformity and energy efficiency of the target material during heating were analyzed.…”

Section: Effect Of Double Waveguidesmentioning

confidence: 99%

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Numerical Modeling and Sensitivity Analysis on Microwave Heating of Plastic on a Large Scale

Jeon¹,

Kim²,

Yang³

2021

Preprint

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To reduce the carbon emissions during heating in the manufacturing process, microwaves have attracted significant attention. Microwave has a lot of advantages rather than traditional heating method such as rapid heating, lower thermal damage and eco-friendly process. In order to apply microwaves to manufacturing process, uniform and efficient heating is required. We have analyzed the effect of various design parameters such as cavity heights, the application of the reflector, and the number and positions of waveguides for uniform and efficient heating by numerical simulation and verified that by experiment. The results showed that a slight change in the cavity height altered the electromagnetic field distribution and heating parameters, such as the coefficient of variance and power absorption efficiency. With reflectors installed, uniform heating was achieved and power absorption was improved, with the spherical reflector showing the maximum efficiency. The use of double waveguides heated the target material in a uniform manner. An increase in the power supply also led to uniform heating. This large-scale analysis will be helpful in applying microwaves to actual industrial sites.

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Section: Effect Of Double Waveguidesmentioning

confidence: 99%

“…To process a material using microwaves, it is essential to predict the temperature profile of the target material [21]. It is difficult, however, to visually examine the temperature profile and electromagnetic field distribution inside a closed metal cavity during an actual test.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling and Sensitivity Analysis on Microwave Heating of Plastic on a Large Scale

Jeon¹,

Kim²,

Yang³

2021

Preprint

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“…Yi used a conveyor belt and a mode stirrer together and obtained a better heating performance than using them individually [ 21 ]. In addition, research has been conducted to improve heating performance by changing the geometry of the cavities [ 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Several studies applied multiple waveguides [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Design of Large-Scale Microwave Cavity for Uniform and Efficient Plastic Heating

2022

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To reduce carbon emissions during heating in the manufacturing processes, microwave technology has attracted significant attention. Microwaves have considerable advantages over traditional heating methods, including more rapid heating, lower thermal damage, and eco-friendly processes. To apply microwaves to the manufacturing process, uniform and efficient heating is required. We analyzed the effect of various design parameters for uniform and efficient heating by changing the cavity heights, application of the reflector, and number and positions of waveguides. We conducted a numerical simulation and verified the findings by experiments. The results showed that a slight change in the cavity height altered the electromagnetic field distribution and heating parameters, such as the coefficient of variance and power absorption efficiency. With reflectors installed, 66% of cases exhibited better comprehensive evaluation coefficient (CEC) with consideration of uniform heating and power absorption. The spherical reflector showed 81% of cases, better than those of the ordinary model without a reflector. Furthermore, when double waveguides were installed, the average coefficient of variance (COV) was improved by 22%, and power absorption efficiency was increased by 53% compared to the single waveguide case. When the power applied to the waveguides was doubled, the average COV values improved by 18%. This large-scale analysis will be helpful in applying microwaves to actual industrial sites.

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“…Environmental pollution due to use of fossil fuels has become the major concern all over the world [1]. Energy production from biomass sources such as forestry residues, woody biomass, dedicated energy crops and sewage sludge has been renowned as promising way to reduce environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Pelletization of Biomass Feedstocks: Effect of Moisture Content, Particle Size and a Binder on Characteristics of Biomass Pellets

Ahmed

Ali

et al. 2021

Preprint

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Pelletization of low value added biomass materials such as furfural residue (FR) and sawdust was performed by using a lab scale pelletizer. Effects of moisture content (MC), particle size and a binder on quality parameters (e.g. pellet density, strength and hardness) and on energy consumption were investigated. Quality of pellets was analysed and compared. MC was found to be the more dominant parameter affecting pellet density, strength and hardness of furfural residue pellets (FRPs) and sawdust pellets (SPs), followed by particle size and a binder. Highest particle density of 1.419 g/cm3 for FRPs (0.5–1.41 mm) and 1.243 g/cm3 for SPs (0.25–0.5 mm) was achieved at MC of 8% and 18%. Highest decrease in relaxed density was observed at MC of 13% for FRPs and 28% for SPs. True density of FRPs and SPs made from particles of 0.25–0.5 mm was found higher than 0.5–1.41 mm. The highest strength and hardness (6.29 MPa and 401.3 N/mm2) for FRPs was achieved at 5.5% MC and particles 0.25–0.5 mm. Optimum strength (6.03 MPa) and hardness (96.06 N/mm2) for SPs was obtained at 18% MC and particles 0.25–0.5 mm. The lowest energy consumption (16.16 J/g) for FRPs (0.25–0.5 mm) and 20.22 J/g for SPs (0.5–1.41 mm) was achieved at MC of 13% and 28%. Addition of binding agent to FR sawdust decreased energy consumption of FRPs and SPs. SPs quality was enhanced with the use of a binder. Heating value of FRPs were found higher than SPs.

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Simulation studies on microwave-assisted pyrolysis of biomass for bioenergy production with special attention on waveguide number and location

Cited by 37 publications

References 22 publications

Numerical Modeling and Sensitivity Analysis on Microwave Heating of Plastic on a Large Scale

Numerical Modeling and Sensitivity Analysis on Microwave Heating of Plastic on a Large Scale

Design of Large-Scale Microwave Cavity for Uniform and Efficient Plastic Heating

Pelletization of Biomass Feedstocks: Effect of Moisture Content, Particle Size and a Binder on Characteristics of Biomass Pellets

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