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comparison of combustion Characteristics of Tars Produced with Tobacco Stem Biomass Gasification

Journal of Renewable Materials 2024年第1期12卷 119-129页

作者： Bo Chen Mingjun Wang Bo Liu Chunping Lu Guohai Jia Yong Chao Chao Zhong School of Mechanical Engineering Hunan Institute of EngineeringXiangtan411104China School of Automotive Engineering Xiangtan Institute of TechnologyXiangtan411100China School of Electrical and Information Engineering Hunan Institute of EngineeringXiangtan411104China China Metallurgic Jingcheng(Xiangtan)Heavy Industry equipment co. Ltd.Xiangtan411100China hunan shuanghuan fiber Molding Machinery co. Ltd.Xiangtan411100China

In order to study the combustion characteristics of tar in biomass gasifier inner wall and gasification gas,“tobacco stem semi-tar inside furnace”,“tobacco stem tar inside furnace”and“tobacco stem tar out-of-furnace”were subjected to thermogravimetric experiments,and the combustion characteristics and kinetic characteristics were *** result shows that“tobacco stem semi-tar inside furnace”has the highest value and“tobacco stem tar out-of-furnace”is has the lowest value on ignition characteristics,combustion characteristics and combustible stability;“tobacco stem semi-tar inside furnace”has the lowest value and“tobacco stem tar outside furnace”has the highest value on burnout characteristics;“tobacco stem tar outside furnace”has the highest value and“tobacco stem tar inside furnace”has the lowest value on integrated combustion characteristics.

关键词： Tobacco stem tar gasifier combustion characteristics

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Formation Mechanism of Biomass Aromatic Hydrocarbon Tar on Quantum Chemistry

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Journal of Renewable Materials 2022年第12期10卷 3491-3504页

作者： Bo Chen Bo Liu Yong Chao Chao Zhong School of Mechanical Engineering Hunan Institute of EngineeringXiangtan411104China School of Electrical and Information Engineering Hunan Institute of EngineeingXiangtan411104China hunan shuanghuan fiber forming equipment co ItdXiangtan411100China

The formation process of aromatic hydrocarbon tar during the pyrolysis process of biomass components of cel-lulose and lignin was carried out by quantum chemical calculation based on density functional theory method B3LYP/6-31G++(d,p).5 Hydroxymethylfurfural was chosen as the model compound of cellulose and hemicel-lulose,and syringa ldehyde was chosen as the model compound of *** calculation results show that the formation process of cellulose monocyclic aromatic hydrocarbon tar is the conversion process of benzene ring from furan ring,and the highest reaction energy barrier appears in the process of decarbonylation,which is 370.8 kJ/*** formation of lignin monocyclic aromatic hydrocarbon tar is mainly the process of side chains removal and the formation of phenol,The highest reaction energy barrier appears in the process of decarbonyla-tion,which is 374.9 kJ/*** reaction mechanism of phenanthrene formation from naphthalene was selected as the formation of cellulose and lignin polycydic aromatic hydrocarbon *** calculation results show that he total barrier of the pathway that naphthalene dehydrogenates to form naphthalene free radicals and then reacts with ethylene twice by addition action,finally occurs cydization reactions and isomerizes to produce phenan-threne is lowest,that is 38.6 kJ/*** it is proved that the evolution of tar is the process of deoxygenation and cyclization with the increase of the temperature from a theoretical point of view.

关键词： Cellulose lignin tar aromatic hydrocarbon quantum chemistry

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Effects of direct aging treatment on microstructure,mechanical properties and residual stress of selective laser melted AlSi10Mg alloy

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Journal of Materials Science & Technology 2023年第8期139卷 198-209页

作者： Huaping Tang Chaofeng Gao Yong Zhang Nannan Zhang Chuan Lei Yunjie Bi Ping Tang Jeremy Heng Rao Institute of Advanced Additive Manufacturing Ji Hua LaboratoryFoshan 528200China Department of Materials Science and Engineering Monash UniversityClaytonVIC 3800Australia National Engineering Research Center of Light Alloy Net forming and State Key Laboratory of Metal Matrix composites Shanghai Jiao Tong UniversityShanghai 200240China hunan Farsoon High-Tech co. LtdChangsha 410000China

Direct aging treatment is an important post-processing procedure,yet little research has been done on how it balances the mechanical properties and the stress removal for selective laser melted(SLMed)AlSi10Mg ***,we proposed a typical direct aging treatment on SLMed AlSi10Mg alloys,and studied the effects on their microstructure,properties and residual stress *** results indi-cate that the as-built microstructure is mainly composed of fine cellularα-Al and reticulated Si phases,and some pre-existing precipitates and dislocations are found in these *** direct aging treatment promotes the precipitation of nano-scaled Si phases and preserves a network-like Si ***,the strength of the peak-aged alloy increases while the ductility *** the aging temperature in-creases from 160 to 200℃,aging hardening behavior was accelerated *** at 160℃ for 4-9 h removes 32.0%-43.0%of the residual stress,which is attributed to the decomposition of the su-persaturatedα-Al matrix,the precipitation of the nano-Si phase and the exposure of low-angle grain boundaries(LAGBs).considering the overal alloy performance obtained,over-aging at 160℃ for 4 h is the optimized heat treatment *** this condition,the yield strength(YS),ultimate tensile strength(UTS)and elongation(EL)of the alloy in the transverse and longitudinal direction are 309.5 MPa,464.4 MPa and 8.3%and 286.4 MPa,464.9 MPa and 5.1%,respectively.

关键词： Selective laser melting AlSi10Mg alloys Direct aging treatment Residual stress removal

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