Title: Analytical solution of coal self-heating characteristics incorporating the effect of oxygen concentration

Authors: Qi Lin; Shugang Wang; Yuntao Liang; Shuanglin Song

Addresses: Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China ' Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China ' State Key Laboratory of Coal Mine Safety Technology, CCTEG Shenyang Research Institute, Shenyang 110016, China ' Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China; State Key Laboratory of Coal Mine Safety Technology, CCTEG Shenyang Research Institute, Shenyang 110016, China

Abstract: A novel analytical solution, which included the effects of temperature distribution and oxygen concentration distribution on coal self-heating system, was presented. It was derived by combining the travelling wave reduced form method and the intermediate variable method. Coal self-heating results were consistent between theory and experiments. Using the analytical solution, the effects of kinetic parameters on coal self-heating were explicitly discussed. For Killoch6015 coal, an increase of pre-exponential and a decrease of other parameters (i.e., activation energy and inlet velocity) was observed at a reference temperature of 350K, and the temperature and oxygen consumption within the coal self-heating system raised in varying degrees. However, an increase in porosity had almost no influence on the coal self-heating process, only exhibiting a weak increase in oxygen concentration and temperature within the system. Finally, the evolution processes of the temperature and oxygen concentration distributions were discussed. [Received: May 24, 2017; Accepted: October 10, 2017]

Keywords: analytical solution; coal self-heating; kinetic parameter; oxygen concentration.

DOI: 10.1504/IJOGCT.2018.093133

International Journal of Oil, Gas and Coal Technology, 2018 Vol.18 No.3/4, pp.423 - 443

Available online: 04 Jul 2018 *

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