Citation: LEI Zhao, YANG Ding, ZHANG Yun-he, CUI Ping. Constructions of coal and char molecular models based on the molecular simulation technology[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(7): 769-779. shu

Constructions of coal and char molecular models based on the molecular simulation technology

Anhui Key Laboratory of Coal Clean Conversion & Utilizaiton, School of Chemistry and Chemical Engineering, Anhui University of Technology, Ma'anshan 243002, China

Corresponding author: CUI Ping, mhgcp@126.com
Received Date: 18 January 2017
Revised Date: 27 April 2017

Fund Project: the National Natural Science Foundation of China 21476001the Open Fund of Shaanxi Key Laboratory of Energy Chemical Process Intensification SXECPI201601Key Project of Anhui Provincial Department of Education KJ2017A045

Figures(14)

Coal and char are essential energy sources for the process industry. Insightful understanding of those molecules is useful to explore reactivities of coal and char. Therefore, coal and char molecular structures were investigated at atomic level using Materials Studio 7.0 software. Firstly, coal and char initial structures were constructed based on reported literatures. Secondly, those structures were improved by molecular mechanics, where functional group fragments were added to satisfy the property of coal or char. Then, the subsequent structures were optimized by annealing dynamics simulation to adjust density and elementary composition. Finally, the potential energies of coal and char were calculated using energy minimization method. It was pointed out that the estimated densities and elementary composition were agreements with the published literatures, which indicated that those structures were valid and reasonable. From the simulated results, it was shown that the Coulomb energy and van der Waals energy played a much more important role than other energies during the stabilizing molecular construction process. Thus, it was inferred that the weak bond was predominant in the thermal processing of coal or char. In addition, this work demonstrated that the molecular simulation technology was meaningful to construct the complex macromolecular structure.
- coal char,
- molecular simulation,
- molecular dynamics,
- annealing dynamics simulation
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