检索结果-南通市图书馆

Investigating the co-combustion characteristics of oily sludge and ginkgo leaves through thermogravimetric analysis coupled with an artificial neural network

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2022年第2期65卷 261-271页

作者： LI ShuChen NIU ShengLi HAN KuiHua LI YingJie WANG YongZheng LU ChunMei Shandong Engineering Laboratory for High-efficiency Energy Conservation and Energy Storage Technology&Equipment School of Energy and PoweringShandong UniversityJinan 250061China

The co-combustion characteristics of oily sludge and ginkgo leaves(GL) in an oxy-fuel atmosphere are investigated via thermogravimetric analysis coupled with an artificial neural network. The combustion characteristics of blends improve as the GL mass ratio increases. The interaction indices used to evaluate the interaction between the two solid combustibles present a complex nonlinear relationship in different stages. The Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose methods are used to calculate the activation energy of the blends, which increases with an increase in the oxygen concentration, in different atmospheres. Compared with the radial basis function, the backpropagation neural network performs better in predicting the combustion curve of the blends.

关键词： oily sludge co-combustion oxy-fuel atmosphere thermogravimetric analysis artificial neural network

Understanding the behavior of recycled aggregate concrete by using thermogravimetric analysis

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2020年第6期14卷 1561-1572页

作者： Subhasis PRADHAN Shailendra KUMAR Sudhirkumar V.BARAI Department of Civil Engineering Indian Institute of Technology KharagpurWest Bengal 721302India Department of Civil Engineering Guru Ghasidas Vishwavidyalaya(A Central University)Chattisgarh 495009India Department of Civil Engineering Birla Institute of Technologv&SciencePilaniPilani 333031India

The physio-chemical changes in concrete mixes due to different coarse aggregate(natural coarse aggregate and recycled coarse aggregate(RCA))and mix design methods(conventional method and Particle Packing Method(PPM))are studied using thermogravimetric analysis of the bydrated cement paste.A method is proposed to estimate the degree of hydration(a)from chemically bound water(WB).The PPM mix designed concrete mixes exhibit lower *** aggregate concrete(RAC)mixes exhibit higher and a after 7 d of curing,contrary to that after 28 and 90 *** chemically bound water at infinite time(WBo)of RAC mixes are lower than the respective conventional concrete *** lower WBo,Ca(OH)2 bound water,free Ca(OH)2 content and FT-IR analysis substantiate the use of pozzolanic cement in the parent concrete of *** compressive strength of concrete and a cannot be correlated for concrete mixes with different aggregate type and mix design method as the present study confirms that the degree of hydration is not the only parameter which governs the macro-mechanical properties of *** this regard,further study on the influence of interfacial transition zone,voids content and aggregate quality on macro-mechanical properties of concrete is needed.

关键词： recycled aggregate concrete Paricle Packing Method thermogravimetric analysis chemically bound water degree of hydration Fourier transform infrared spectroscopy

Evaluation of oxygen uncoupling characteristics of oxygen carrier using micro-fluidized bed thermogravimetric analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2021年第4期34卷 408-415页

作者： Lei Liu Zhenshan Li Ye Li Ningsheng Cai Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China

Oxygen uncoupling characteristics of a natural manganese ore and a perovskitetype oxide CaMn_(0.5)Ti0_(37)5Fe_(0.125)O_(3)were studied by using a microfluidized bed thermogravimetric analysis(MFBTGA)technology which is based on a realtime mass measurement of fluidizing particles inside a bubbling bed *** chemical stability,kinetics of the oxygen release and uptake reactions and fluidization property were investigated and the experimental data measured by MFBTGA were compared with the results in a regular TGA instrument(TGA Q500).The regular TGA Q500 results show the reactivity of both the manganese ore and perovskite oxide are stable for multi cycles,and the oxygen uncoupling capacity of the manganese ore is~1.2%(mass)which is~2 times higher than that of the perovskite ***,the experimental results from the MFBTGA indicated that there is a serious agglomeration for the manganese ore.A very important finding is that the reaction rate of oxygen release and oxygen uptake of the perovskite oxide measured by the MFBTGA are~2 and~4 times faster than that of testedby the TGA *** can conclude that MFBTGA is a very useful tool to measure the reactivity stability and kinetics of oxygen carriers in highthroughput analysis instead of the regular TGA.

关键词： CO_(2)capture Oxygen carrier Oxygen uncoupling Fluidized-bed thermogravimetric analysis Agglomeration

Pyrolysis and combustion kinetics of lycopodium particles in thermogravimetric analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2015年第9期22卷 3409-3417页

作者： Seyed Alireza Mostafavi Sadjad Salavati Hossein Beidaghy Dizaji Mehdi Bidabadi Department of Mechanical Engineering Faculty of Engineering Arak University School of Mechanical Engineering Department of Energy Conversion Combustion Research Laboratory Iran University of Science and Technology

Biomass is a kind of renewable energy which is used increasingly in different types of combustion systems or in the production of fuels like bio-oil. Lycopodium is a cellulosic particle, with good combustion properties, of which microscopic images show that these particles have spherical shapes with identical diameters of 31 μm. The measured density of these particles is 1.0779 g/cm2. Lycopodium particles contain 64.06% carbon, 25.56% oxygen, 8.55% hydrogen and 1.83% nitrogen, and no sulfur. thermogravimetric analysis in the nitrogen environment indicates that the maximum of particle mass reduction occurs in the temperature range of 250-550 ℃ where the maximum mass reduction in the DTG diagrams also occurs in. In the oxygen environment, an additional peak can also be observed in the temperature range of 500-600 ℃, which points to solid phase combustion and ignition temperature of lycopodium particles. The kinetics of reactions is determined by curve fitting and minimization of error.

关键词： lycopodium dust particles thermogravimetric analysis pyrolysis combustion ignition temperature chemical kinetics

Use of thermogravimetric analysis for Moisture Determination in Difficult Lyophilized Biological Samples

在线全文

学校读者我要写书评

暂无评论

American Journal of Analytical Chemistry 2016年第3期7卷 260-265页

作者： Paul Matejtschuk Chinwe Duru Kiran Malik Ernest Ezeajughi Elaine Gray Sanj Raut Fatme Mawas Standardization Science National Institute for Biological Standards & Control (NIBSC) Hertfordshire UK Biotherapeutics Division National Institute for Biological Standards & Control (NIBSC) Hertfordshire UK Bacteriology Division National Institute for Biological Standards & Control (NIBSC) Hertfordshire UK

Residual moisture is a key quality control parameter for lyophilized biologicals, as high moisture can correlate with poor stability. Coulometric Karl Fischer titration is the most widely used technology to determine residual water content;some chemicals are known to cause problems with Karl Fischer titration, but these chemicals do not usually occur in biologics. Three biological samples, of fibrinogen, heparin and Haemophilus influenza b polysaccharide, have caused particular issue in our hands by routine Karl Fischer analysis, illustrating different limitations with this method. The use of thermogravimetric analysis, with evolved gas mass spectrometric monitoring, is described here as a successful alternative for moisture analysis in these materials.

关键词： thermogravimetric analysis Freeze Dried Moisture Determination Karl Fischer Titration

Characterization by thermogravimetric analysis of Polymeric Concrete with High Density Polyethylene Mechanically Recycled

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Minerals and Materials Characterization and Engineering 2014年第4期2卷 259-263页

作者： Alma Delia Rodriguez Martinez Martha Lilia Dominguez Patino Rosa Maria Melgoza Aleman Gerardo Antonio Rosas Trejo Graduate Engineering and Applied Science Autonomus University of the State of MorelosChamilpaMorelosMexico Faculty of Chemical Sciences and Engineering Autonomus University of the State of MorelosChamilpaMorelosMexico Metallurgical Research Institute University Michoacana de San Nicolas de HidalgoMoreliaMichoacanMexico

This paper presents the results of the characterization by thermogravimetric analysis of a new composite material called polymeric concrete. The polymeric concrete contains micro-particles obtained from High Density Poly-Ethylene (HDPE) mechanically recycled (post-consumer bottles);the official Mexican standard NMX-E-232-SCFI-1999 considers the HDPE as the recyclable plastic material. Thermo-grams based on weight lost were obtained from the raw material (HDPE) and the polymer concrete in order to obtain the glass transition temperature (Tg) and melting temperature (Tf). The analysis conditions were defined from 20°C to 180°C and the heat rate of 1°C/minute. The results show that the glass transition temperature of polymeric concrete is 46°C and the HDPE is 38°C. These results mean that the polymeric concrete is more resistant to decomposition. With respect to the melting temperature, the results show that the 2°C difference between polymeric concrete and HDPE is not significant. The polymeric concrete with HDPE recycled can be considered as composite material thermoplastic. The new material melts when it is heated to 146°C and has the ability to be softened, processed and reprocessed with temperature and pressure changes, which make it possible to obtain molded pieces in the desired shape.

关键词： Polymer Concrete High Density Poly-Ethylene thermogravimetric analysis

Synergistic effects and kinetics analysis for co-pyrolysis of vacuum residue and plastics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2024年第5期18卷 71-81页

作者： Chao Wang Xiaogang Shi Aijun Duan Xingying Lan Jinsen Gao Qingang Xiong State Key Laboratory of Heavy Oil Processing China University of Petroleum-BeijingBeijing 102249China State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China

This study utilizedathermogravimetric analyzer to assess the thermal decomposition behaviors and kinetics properties of vacuum residue(VR)and low-density polyethylene(LDPE)*** kinetic parameters were calculated using the Friedman *** demonstrate the interactive effects between LDPE and VR during the co-pyrolysis process,the disparity in mass loss and mass loss rate between the experimental and calculated values was *** co-pyrolysis curves obtained through estimation and experimentation exhibited significantdeviations,whichwerei influencedby temperature and mixing ratio.A negative synergistic interaction was observed between LDPE and VR,although this inhibitory effect could be mitigated or eliminated by reducing the LDPE ratio in the mixture and increasing the ***-pyrolysisprocess resulted in a reduction in carbon residue,which could be attributed to the interaction between LDPE and the heavy fractions,particularly resin and asphaltene,present in *** findings align with the pyrolysis behaviors exhibited by the four VR ***,it was observed that the co-pyrolysis process exhibited lower activation energy as the VR ratio increased,indicating a continuous enhancement in the reactivity of the mixed samples during co-pyrolysis.

关键词： co-pyrolysis heavy residual oil polyethylene thermogravimetric analysis synergistic effects

Pyrolytic and kinetic analysis of coastal plant Xanthium sibiricum

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 2015年第1期33卷 135-138页

作者：王晓宁朱立猛秦松张亦陈刘逸尘孙金生李莉莉 Tianjin Key Laboratory of Animal and Plant Resistancel College of Life Science Tianjin Normal University Yantai Institute of Coastal Zone Research Chinese Academy of Sciences College of Chemical and Environmental Engineering Shandong University of Science and Technology Tianjin Center for Control and Prevention of Aquatic Animal Infectious Disease

The fuel properties of coastal plant Xanthium sibiricum were investigated in *** distributed activation energy model was employed in the kinetic analysis and a simplified mathematical model that can predict the thermogravimetry curves was *** results show that the initial decomposition temperature tends to increase with the heating *** distributed E values ranged from 169.08 to 177.43 kJ/mol,and the frequency factor values ranged from 6.59× 10~8 to 1.22×10^(12)/s at different conversion ***,the prediction made with the simplified mathematical model perfectly matched the experimental data,and the model was found to be simple and accurate for the prediction of devolatilization curves.

关键词： Xanthium sibiricum thermogravimetric analysis distributed activation energy model simplifiedmathematical model

Thermal analysis of lithium ion battery cathode materials for the development of a novel pyrometallurgical recycling approach

在线全文

学校读者我要写书评

暂无评论

Carbon Resources Conversion 2021年第1期4卷 184-189页

作者： Stefan Windisch-Kern Alexandra Holzer Christoph Ponak Thomas Hochsteiner Harald Raupenstrauch Montanuniversitaet Leoben Chair of Thermal Processing TechnologyAustria

Since pyrometallurgical approaches on lithium ion battery recycling are not yet capable of recovering lithium but only nickel,cobalt and manganese,the Chair of Thermal Processing Technology at the Montanuniversitaet Leoben started to investigate experimental reactor concepts on their suitability to overcome this major ***,the general behaviour of currently used cathode materials under reducing conditions and high temperatures is of great *** work expands previous performed heating microscope experiments by thermogravimetric analysis(TGA)to characterize the reactions that are responsible for certain changes in the cathode *** comparing the superficial changes of the samples in the heating microscope with the corresponding data from the TGA,it was possible to identify the temperature zones in which reduction reactions *** all investigated cathode materials,the reduction reactions started at technically feasible temperatures of approx.1000◦C,which is favorable for the desired recycling *** the other hand,this is some hundred degrees higher than the temperature at which first changes in the heating microscope could be observed and indicates that there are changes in the material before the reduction ***,the results also emphasize the need for further analysis to clarify this offset and to complete the thermal characterisation of the cathode materials.

关键词： Lithium-ion-batteries recycling thermogravimetric analysis Heating microscope High temperature processing Pyrometallurgy