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Lightning propagation through the earth and its potential for methane ignitions in abandoned areas of underground coal mines.

Authors
Novak-T; Fisher-TJ
Source
IAS '00: Conference Record of the 2000 IEEE Industry Applications Conference: Thirty fifth IAS Annual Meeting, October 8-12, 2000, Rome, Italy. Piscataway, NJ: Institute of Electrical and Electronics Engineers, 2000 Oct; 4::2674-2681
NIOSHTIC No.
20021028
Abstract
Strong circumstantial evidence suggests that lightning has initiated methane explosions in abandoned and sealed areas of underground coal mines. The Mine Safety and Health Administration (MSHA) investigated several of these occurrences within recent years. The investigated explosions occurred at significant depths, ranging from 500 ft to 1200 ft. Data from the National Lightning Detection Network indicate a definite correlation between the times and locations of the explosions with those of specific lightning strikes. This paper addresses the question, "Can lightning cause potential differences capable of igniting methane-and-air mixtures at overburden depths at which underground coal mining occurs?" A mine depth of 600 ft was selected for this study. Computer simulations were performed, with and without the presence of a metal-cased borehole extending from the surface to the mine level. CDEGS software from Safe Engineering Services & Technologies, Ltd (SES) was used for the simulations.
Keywords
Mining-industry; Lighting; Underground-mining; Methanes; Explosions; Coal-mining; Computer-software; Computer-models
CAS No.
74-82-8
Publication Date
20001001
Document Type
Conference/Symposia Proceedings
Fiscal Year
2001
NTIS Accession No.
NTIS Price
NIOSH Division
PRL
Source Name
IAS '00: Conference Record of the 2000 IEEE Industry Applications Conference: Thirty fifth IAS Annual Meeting, October 8-12, 2000, Rome, Italy
State
NJ; AL; PA
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