Prediction of Longwall Methane Emissions: An Evaluation of the Influence of211 Mining Practices on Gas Emissions and Methane Control Systems

摘要

The primary purpose of this field study was to predict the methane emission211u001econsequences of mining longwall panels of greater face width in the Pochontas No. 211u001e3 Coalbed in Virginia. Mines were to be increased from 229 to 305 m (750 to 1,000 211u001eft). However, since historically high methane emissions from the longwall face 211u001eand gobs were already being experienced, there was a concern for further 211u001eincreases in methane emission rates. If preferables from a safety perspective to 211u001ebe prepared in advance, either with increased ventilation airflow, or with 211u001eadditional methane drainage. The bleeder and methane drainage systems associated 211u001ewith the two study panels were also evaluated to fully characterize the methane 211u001eliberation patterns and control system performance for each study area.