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Effects of reaction temperature,time and particle size on switchgrass microwave pyrolysis and reaction kinetics

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International Journal of Agricultural and Biological Engineering 2013年第1期6卷 53-61页

作者： Rui Zhou Hanwu Lei James L.Julson Department of Agricultural and Biosystems Engineering South Dakota State UniversityBrookingsSouth Dakota 57007 USA Bioproducts Sciences and Engineering LaboratoryDepartment of Biological Systems EngineeringWashington State UniversityRichlandWashington 99352 USA

This study investigated microwave pyrolysis of switchgrass with particle sizes from 0.5 mm to 4 mm and determined the effects of reaction temperature and time on the yields of bio-oil,syngas,and bio-char.A prediction model was satisfactorily developed to describe the bio-oil conversion yield as a function of reaction temperature and ***-order reaction kinetics was also developed to model the switchgrass *** with different particle sizes was found to be similarly pyrolyzed by microwave *** research results indicated that thermochemical conversion reactions can take place rapidly in large-sized switchgrass by using microwave ***-MS analysis indicates that the bio-oil contained a series of important and useful chemical compounds:phenols,aliphatic hydrocarbons,aromatic hydrocarbons,and furan *** chemical compounds evolved were related to the pyrolysis conditions.

关键词： switchgrass microwave pyrolysis kinetics bio-oil syngas bio-char

Kinetic and thermodynamic investigations of CO2 gasification of coal chars prepared via conventional and microwave pyrolysis

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International Journal of Coal Science & Technology 2020年第3期7卷 422-432页

作者： Peng Jiang Yang Meng Ziyao Lu Lan Xu Gang Yang Xiang Luo Kaiqi Shi Tao Wu Department of Chemical and Environmental Engineering The University of Nottingham Ningbo ChinaNingbo315100China Key Laboratory for Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province The University of Nottingham Ningbo ChinaNingbo315100China

This study examined an isothermal CO2 gasification of four chars prepared via two different methods,i.e.,conventional and microwave-assisted pyrolysis,by the approach of thermogravimetric ***,chemical,and structural behaviours of chars were examined using ultimate analysis,X-ray diffraction,and scanning electronic *** parameters were calculated by applying the shrinking unreacted core(SCM)and random pore(RPM)***,char-CO2 gasification was further simulated by using Aspen Plus to investigate thermodynamic performances in terms of syngas composition and cold gas efficiency(CGE).The microwave-induced char has the largest C/H mass ratio and most ordered carbon structure,but the smallest gasification *** analysis indicates that the RPM is better for describing both gasification conversion and reaction rates of the studied chars,and the activation energies and pre-exponential factors varied in the range of 78.45–194.72 kJ/mol and 3.15–102,231.99 s−1,*** addition,a compensation effect was noted during ***,the microwave-derived char exhibits better thermodynamic performances than the conventional chars,with the highest CGE and CO molar concentration of 1.30%and 86.18%,*** the pyrolysis temperature,gasification temperature,and CO2-to-carbon molar ratio improved the CGE.

关键词： Coal char CO2 gasification microwave pyrolysis Char properties Kinetics Thermodynamic

Catalytic microwave assisted pyrolysis of aspen

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International Journal of Agricultural and Biological Engineering 2009年第4期2卷 70-75页

作者： Johannes Moen Changyan Yang Bo Zhang Hanwu Lei Kevin Hennessy Yiqin Wan Zhiping Le Yuhuan Liu Paul Chen Roger Ruan Center for Biorefining Department of Biosystems and Agricultural EngineeringUniversity of Minnesota1390 Eckles Ave.St.PaulMN 55108USA Department of Mathematical Sciences and Technology Norwegian University of Life SciencesPostboks 50031432ÅsNorway School of Chemical Engineering and Pharmacy Wuhan Institute of TechnologyHubei 430074China Center for Bioproducts and Bioenergy Department of Biological Systems EngineeringWashington State UniversityRichlandWA 99354 USA Jiangxi Biomass Engineering Center Nanchang UniversityNanchang 330047China

The effect of catalysts on the microwave pyrolysis of aspen pellets was studied.A range of chlorides,nitrates and metal-oxides were added at 2%of the aspen mass(air dry aspen pellet weight basis).Chlorides in particular were found to favor liquid yield,especially the yield of water phase *** liquid yield with added chlorides was 41%mass of the total biomass input,compared to 35%mass without ***-oxides were found to favor pyrolysis heavy oil,and thus total oil yield,since the yield of light oils seemed to be fairly *** were found to favor pyrolysis gas *** light oils and light oils blended with diesel were found to be a potential diesel fuel substitute.

关键词： Renewable energy pyrolysis microwave pyrolysis pyrolysis liquids bio-oils pyrolysis catalysts

Processing and properties of rigid polyurethane foams based on bio-oils from microwave-assisted pyrolysis of corn stover

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International Journal of Agricultural and Biological Engineering 2009年第1期2卷 40-50页

作者： Jianping Wu Yuanhua Wang Yiqin Wan Hanwu Lei Fei Yu Yuhuan Liu Paul Chen Lirong Yang Roger Ruan Center for Biorefining and Department of Bioproducts and Biosystems Engineering University of Minnesota1390 Eckles Ave.St.PaulMN 55108USA College of Material Science and Chemical Engineering Zhejiang UniversityHangzhou 310027China Du Pont Agricultural Chemicals Ltd. Shanghai 3055 Pudong BeiluShanghai 200137China MOE Biomass Engineering Center and State Key Laboratory of Food Science and Technology Nanchang UniversityNanchang 330047China Department of Agricultural and Biosystems Engineering South Dakota State UniversityBrookingsSD 57007USA Department of Forest Products Mississippi State UniversityBox 9820Mississippi StateMS 39762USA

A new kind of rigid polyurethane(PU)foam was synthesized from the oil phase of bio-oils from microwave-assisted pyrolysis of corn *** recipes for the PU foams consisted of polyol-rich bio-oils,water as blowing agent,polyethylene glycol(PEG)as both polyol donor and plasticizer,diphenylmethane-4,4’-diisocyanate(polymeric MDI)as cross-linking agent,silicon-based surfactant,and tin-based *** mechanical properties of rigid foams were measured with universal testing machine(Instron4206).The effects of individual ingredients on the physical and mechanical properties of the foams were *** was found that water content,bio-oil content,and isocyanate dosage were important variables in making PU foams in terms of mechanical strength,density,and cellular structure Under optimal conditions,the compression strength of the prepared PU foams reached 1130 kPa with a density of 152.9 g/*** results show that bio-oils are potential renewable polyol sources for making rigid PU foams.

关键词： rigid polyurethane foam PU bio-oil microwave pyrolysis corn stover physical properties