Abstract
In order to improve the efficiency of gas drainage before and during longwall extraction, a waterjet rotary cutting system has been developed for in-seam cross panel methane drainage. The purpose of the water rotary cutting system developed was to create artificial fractures along the gas drainage boreholes. During the design of the system, it was perceived that the nozzle geometry is one of the key factors, affecting cutting capacity. Therefore, we studied the structural and geometric parameters of the nozzle and optimized its performance during laboratory tests and numerical simulation. Underground trials conducted in a coal mine, indicate that production of gas drainage before and after cutting significantly increased by up to three times. The advantages of waterjet assisted gas drainage method has been identified as: 1) increasing gas drainage efficiency, 2) a possible development of a gas drainage fractured network within coal seams associated with panel extraction, and 3) reducing the risk of exceeding gas limits during longwalling.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.