Effect of heating rate on microstructure evolution and mechanical-seepage characteristics of hot-pressed briquettes
GAN Qingqing,
XU Jiang,
CAI Guoliang,
LEI Lihao,
YUAN Jiamin,
PENG Shoujian
Affiliations
GAN Qingqing
School of Emergency Management and Safety Engineering, Jiangxi University of Science and Technology, Ganzhou Jiangxi 341000, China
XU Jiang
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
CAI Guoliang
State Key Laboratory of the Gas Disaster Detecting Preventing and Emergency, Chongqing Research Institute, China Coal Technology Engineering Group, Chongqing 400037, China
LEI Lihao
School of Emergency Management and Safety Engineering, Jiangxi University of Science and Technology, Ganzhou Jiangxi 341000, China
YUAN Jiamin
School of Emergency Management and Safety Engineering, Jiangxi University of Science and Technology, Ganzhou Jiangxi 341000, China
PENG Shoujian
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
Briquette production method is vital to improving its strength and permeability in physical simulation test of coal mine gas disasters. This study adopts the Horsfield dense packing theory to optimize the ratio of briquette materials and investigates the mechanical-seepage characteristics, molecular and pore structure of hot-pressed briquettes under different heating rates. Results show that as the heating rate increases, the proportion of C1s elements and the contents of alcohol, C—O/C—OH, aromatic hydrocarbons and C—C/C—H in functional groups in the molecular structure of hot-pressed briquettes show a fluctuating pattern of initial increase, subsequent decrease and final increase; the uniaxial compressive strength first increases and then decreases, while the initial permeability first decreases and then increases. The optimum heating rate is 5 ℃/min. This study offers references to improving the similarity between briquette and raw coal.
