Spontaneous heating and gas drainage on a coal face with "four-gateroad" and overlying drainage tunnel
MetadataShow full item record
Based on the 15101 working face, this paper investigates coupling effects between gas drainage and spontaneous heating of residual coal in goaf due to the suction pressure in overlying drainage gateroad in the face with four-gateroad system. Extensive numerical simulations are conducted by setting up the theoretical model, field measurements of boundary conditions and other model parameters. The results show that increasing the negative pressure in overlying drainage gateroad can greatly improve gas drainage efficiency. Methane concentration can also be greatly reduced in the tailgate. The changes of the negative pressure have a little significant effect on the "three-zone" of spontaneous combustion in the gob area. However, if both a high level drainage gateroad and an inner stagger drainage entry exist in the working face, these may lead to significant air leakage in the goaf and consequently increase the risk of combustion heating. The optimum negative pressure can be determined as 2.486 kPa according to the upper gas limit of 2.5% in tailgate in the 15101 working face.
Showing items related by title, author, creator and subject.
Zhang, J.; Zhang, Q.; Spearing, Sam; Miao, X.; Guo, S.; Sun, Q. (2016)Aiming to address the following major engineering issues faced by the Pingdingshan No. 12 mine: (1) difficulty in implementing auxiliary lifting because of its depth (i.e., beyond 1000m); (2) highly gassy main coal seam ...
Mullins, Ben; Mead-Hunter, Ryan; Pitta, R.; Kasper, G.; Heikamp, W. (2014)The evolution of pressure drop, drainage rate, saturation, and efficiency of combined philic, and phobic oil mist filters in real-time are examined. The experiments used four different filter configurations, with a ...
Experimental study on the goaf flow field of the "u+I" type ventilation system for a comprehensive mechanized mining faceYu, Z.; Yang, S.; Qin, Y.; Hu, X.; Cheng, Jianwei (2015)© 2015 Published by Elsevier B.V. on behalf of China University of Mining & Technology. "U" and "U+I" type ventilation experiments were performed on a three-dimensional fully mechanized caving face simulation experimental ...