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In this report underground measurements on the performance of prefabricated back-return and coal pillar back-return systems, for controlling waste edge methane at the return end of a coal face, were analysed in detail. The coal pillar system was found to be a more reliable method of methane fringe control. Data from underground measurements were used to develop computational fluid dynamics (CFD) models of the waste and back-return systems, the details of which are discussed in the report. CFD simulations indicate that better control of the methane fringe can be obtained for curtain systems by removing brattice barriers from the abandoned roadway beyond the back return, and for coal pillar systems by maintaining snicket sizes. Tracer studies indicated that where airflows are large, flows of air in the waste run sub-parallel with the flows on the face and in the back return, only cutting across the waste within the last few metres from the return end. A hypothesis has been put forward in the report to explain the controls of face height, face length, depth of working and strength of strata on the size of the methane emission zone around a working.

Additional information

Authors: KERSHAW S, British Coal Corporation, Cheltenham (GB)
Bibliographic Reference: EUR 17391 EN (1997) 126pp., FS, ECU 21.50
Availability: Available from the (2)
ISBN: ISBN 92-826-9191-8
Record Number: 199710632 / Last updated on: 1997-05-26
Original language: en
Available languages: en
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