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Shin, Sangcheol,Im, Soo Ik,Kwon, Eun Hee,Na, Jeong-Geol,Nho, Nam Sun,Lee, Ki Bong Elsevier 2017 JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS Vol.124 No.-
<P><B>Abstract</B></P> <P>Pyrolysis is an important conversion process which can produce high value-added light oils from unconventional oils such as oil sand bitumen and extra heavy oil, thus it is important to understand the characteristics and kinetics of pyrolysis for unconventional oils. In this study, the nonisothermal pyrolysis of Athabasca oil sand bitumen and its maltene and asphaltene fractions was analyzed using a thermogravimetric analyzer, and activation energies for pyrolysis were determined by the model-free isoconversional Friedman analysis. The analysis suggests that the pyrolysis of oil sand bitumen consists of reactions for volatilization of maltene fraction and cracking of maltene and asphaltene fractions. The pyrolysis behavior of oil sand bitumen was well described based on the kinetic parameters estimated by the distributed activation energy model for maltene and asphaltene fractions, which is beneficial to effective utilization and development of pyrolysis processes of oil sand bitumen.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nonisothermal pyrolysis of oil sand bitumen and its maltene and asphaltene fractions. </LI> <LI> Determination of activation energies by model-free isoconversional Friedman analysis. </LI> <LI> Prediction of pyrolysis behavior of oil sand bitumen using kinetic parameters. </LI> </UL> </P>
Kinetic analysis using thermogravimetric analysis for nonisothermal pyrolysis of vacuum residue
Shin, Sangcheol,Im, Soo Ik,Nho, Nam Sun,Lee, Ki Bong Springer-Verlag 2016 Journal of thermal analysis and calorimetry Vol.126 No.2
<P>Pyrolysis is a relatively simple upgrading process that can produce light oil from unconventional oil and heavy residue. For effective utilization of pyrolysis processes, it is important to understand its kinetic parameters. In this study, the nonisothermal pyrolysis of vacuum residue (VR) was analyzed using a thermogravimetric analyzer and the activation energy of the VR pyrolysis reaction was estimated by several theoretical methods. It was found that isoconversional methods were more suitable than nonisoconversional methods for analyzing complex pyrolysis reaction of VR. The Friedman method, a differential isoconversional method, is thought to be the most appropriate among the various methods tested because it can describe the complexity of the pyrolysis reaction of VR and there is no need for information of exact reaction model and mathematical assumptions for temperature integral, which can raise systematic errors in the kinetic analysis. Finally, the kinetic parameters of VR pyrolysis were determined based on the results of Friedman analysis and distributed activation energy model (DAEM), and VR pyrolysis behavior was well expressed with the kinetic parameters obtained from DAEM analysis.</P>
SangCheol Moon,Bong-Chul Kim,Shin-Young Cho,Chi-Hyung Ahn,Gun-Woo Moon IEEE 2014 IEEE transactions on industrial electronics Vol.61 No.11
<P>This paper presents a theoretical analysis, an optimal design method, and experimental results for a wireless power transfer (WPT) system with an intermediate coil. The analytical expression of the dc voltage transfer function is presented and discussed. In a two-coil WPT system, which has low coupling coefficient, the intermediate coil boosts the apparent self-inductance and magnetizing inductance of the primary side at around the resonance frequency of the intermediate coil, so that the apparent coupling coefficient is compensated. The coupling coefficient makes the system efficiency increase and induces bifurcation phenomenon. From the analysis, this paper proposes an optimal design method using the second resonance frequency operation with the bifurcation phenomenon and presents design procedure for high efficiency. A prototype of the WPT system with the intermediate coil is implemented and experimented to verify the validity of the analysis and the proposed design method. The prototype operates at 100 kHz switching frequency and has an air gap between primary and secondary side of 200 mm. An overall system efficiency of 95.57% has been achieved at 6.6 kW of output power.</P>
박상철(Sangcheol Park),송연민(Younmin Song),신경훈(Kyunghun Shin),최성규(Seongkyu Choi),박정원(Jungwon Park) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Body stiffness has a direct effect on suspension geometry change. also has a closely connection with driving characteristics. Thus, the body stiffness must have be considered for the correct analyzation of driving characteristics. Therefore in this study, we developed UTV(Utility Terrain Vehicle) driving characteristics analysis model under the consideration of body stiffness. The UTV analysis model is constructed based on the data such as weight measurement, hard-point measurement, 3D scan and spring & damper test etc. We use the ADAMS/car as the analysis tool. We studied the corelation between the UTV analysis model and ride & handling test results for the more accuracy analysis model development. Body stiffness was approximated with bush elements which was based on stiffness result data through bending and torsion test. The developed model has been compared and verified with ride & handling test results and another UTV analysis model with rigid body. And then, we analyzed the effect of body stiffness on driving characteristics.