Numerical simulation of coal pencil expansion behavior in Audibert-Arnu dilatometer experiment
Luo Jie1, Duan Lianlei1, Manlidan·Zerminbieke2,3, Liu Ying1, Cheng Shuai4
1. Xinjiang Uygur Autonomous Region, Coal Coalbed Methane Testing Institute, Urumqi 830091, China； 2. School of Management and Economics, Kunming University of Science and Technology, Kunming 650093, China； 3. Xinjiang Institute of Metrology and Testing, Uygur 831400, China； 4. Xinjiang University, Uygur 831400, China
The expansion behavior of the coal pencil during the carbonization process in the Audibert-Arnu dilatometer experiment was studied by numerical simulation. The discrete element method (DEM) was used to simulate the expansion behavior of the coal pencil during the carbonization process, and the effects of three different coal particle compositions and operating conditions on the expansion of the coal pencil were analyzed. The results show that when coal particles of the same particle size fall, the height of the coal pencil was determined by the particle size, and when coal particles of the same particle size expand, the height of the coal pencil was also determined by the particle size. However, the height of the coal pencils with different particle sizes is lower than that of the coal pencils with the same particle size, which is due to the fact that the smaller coal particles enter the gaps between the larger coal pencil particles. The research on the swelling behavior of coal pen in the carbonization process is of great significance for the reasonable allocation of coal particle composition and the improvement of the success rate of coal pen preparation.
