Three-dimensional simulation of a novel microwave-assisted heating device for methyl ricinoleate pyrolysis

Yu, Shangzhi; Duan, Ying; Zhou, Xing; Xie, Qinglong; Zeng, Gaoxiang; Mao, Xiaoning; Liang, Xifeng; Lu, Meizhen; Nie, Yong; Ji, Jianbing

doi:10.1016/j.applthermaleng.2019.03.003

Cited by 25 publications

(11 citation statements)

References 22 publications

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“…For comparison purpose, the temperature and electric field distributions of the SiC bed surface were simulated using a multiphysics software. The details for the simulation can be found in our previous report [11].…”

Section: Experimental Processmentioning

confidence: 99%

“…The non-premixing, i.e., the feedstock is directly poured on the heated microwave absorbent bed for pyrolysis reactions is one of methods adopted for microwave pyrolysis [10]. Based on the non-premixing method, our group designed a microwave-assisted reactor coupled with atomization feeding and used it in the pyrolysis of methyl ricinoleate [11][12][13][14]. We have achieved good results in a small-scale microwave reactor and now focus on the device scaleup.…”

Section: Introductionmentioning

confidence: 99%

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Temperature distribution of SiC bed surface in a large-scale microwave-assisted pyrolysis reactor

Duan

Xie

et al. 2021

Preprint

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Microwave reactors equipped with microwave absorbent as high-temperature bed are effective for the pyrolysis reactions. The uniformity and stability of temperature distribution on the microwave absorbent bed surface is important to the microwave pyrolysis reactor especially in the large-scale reactor. Herein, the temperature distribution on the SiC microwave absorbent bed in a large-scale microwave pyrolysis reactor without feeding was examined by both infrared thermography and simulation. Considering the economics of using multiple low-power magnetrons in large-scale reactor, the effect of the working magnetrons location on the heating rate of bed surface and the COV of temperature distribution was investigated. The results showed that more uniform and stable temperature distribution of bed surface in the large-scale reactor was obtained when the magnetrons located at the bottom of the reactor were in use. This study provides guidance for the scale-up of microwave-assisted pyrolysis reactor with multiple low-power magnetrons.

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Section: Experimental Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature distribution of SiC bed surface in a large-scale microwave-assisted pyrolysis reactor

Duan

Xie

et al. 2021

Preprint

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“…The reaction temperature and heating rate of feedstock were the main influencing factors for pyrolysis [2]. Thus, the uniformity and speed of heating the feedstock in a stable high-temperature reaction site become the key to achieve the high yield and selectivity of target products [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Silicon carbide (SiC) is often used as microwave absorbent and heating medium owing to its high dielectric constant, large specific heat capacity and good thermal conductivity [7]. SiC under microwave heating could provide a stable high-temperature reaction site for the pyrolysis reactions [3].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer in a novel microwave heating device coupled with atomization feeding

Xie

Mao

et al. 2022

THERM SCI

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The heat transfer characteristics of the microwave heating coupled with atomization feeding were investigated using ethanol as the spray medium on a pressure swirl nozzle. The effects of spray height, flow rate and temperature on the sauter mean diameter (SMD) of atomized droplets were examined. The results showed that the droplet SMD was 12-130 ?m, which increased with the spray height and decreased with the flow rate and temperature of spray medium. Through the fitting of the experimental data, the dimensionless correlation of the droplet SMD which was based on orifice diameter, Reynolds and Ohnesorge numbers was obtained. The calculated results were basically consistent with the experimental data within 15% error. The heat transfer characteristics of atomized droplets on high-temperature surface of SiC bed heated by microwave were then investigated. The effects of spray flow rate, spray height and spray temperature on the heat transfer characteristics were examined. The power of spray heat transfer decreased with the temperature and increased with the spray flow rate and spray height. The dimensionless correlation to describe the heat transfer characteristics of atomized droplets on the high-temperature SiC surface under the microwave heating was obtained which included thermophysical properties of spray medium, spray parameters, and temperatures of the high-temperature bed surface and spray medium, with the error of ?20%. These correlations can be used to predict the SMD of the atomized droplets and the power of spray heat transfer in the microwave heating process.

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“…The analysis allows the definition of uniform heating processes and control the temperature to dry the rice straw as per the requirement of torrefaction process. The analysis is performed with multiphysics computer simulation [7]. The simulation is performed with 3-D structure of rice straw placed inside the microwave cavity.…”

Section: Introductionmentioning

confidence: 99%

Simulation Studies on Microwave Assisted Drying of Biomass With Special Attention to the Size of Biomass

Singh¹,

Saluja²,

Singh³

2020

International Journal of Mechanical Engineering and Technology (Ijmet)

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The crop-waste is available in abundant to generate energy. The energy conversion process involve production of biofuel from crop-waste. This paper considers the conversion of rice straw to energy. The conversion involve the preprocessing of rice straw which includes drying and its conversion to powder form. This paper proposes the microwave assisted drying process for rice straw. The single strand of rice straw is considered in the paper. The Multiphysics simulation is performed to understand the heat generation and heat-transfer rate with variation in the size of rice straw. The proposed process involves the cutting of rice straw to specific sizes. The rice straw size plays an important role in absorbing microwave energy. The heating pattern depends on the mode of transverse electric field interacting with specified size of rice straw. The different modes getting excited in the rice straw depends on its size. It is observed in this paper that the large size of rice straw help in achieving multiple modes in a single strand of rice straw. Hence, it results in optimized microwave process to achieve the uniform heating in rice straw. The cutting of rice straw before microwave processing requires the rice straw to size between 8 cm to 12 cm.

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Three-dimensional simulation of a novel microwave-assisted heating device for methyl ricinoleate pyrolysis

Cited by 25 publications

References 22 publications

Temperature distribution of SiC bed surface in a large-scale microwave-assisted pyrolysis reactor

Temperature distribution of SiC bed surface in a large-scale microwave-assisted pyrolysis reactor

Heat transfer in a novel microwave heating device coupled with atomization feeding

Simulation Studies on Microwave Assisted Drying of Biomass With Special Attention to the Size of Biomass

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