摘要
Abstract
Based on mining characteristics of thick loose bed and thin bedrock shallow depth and close distance coal seam group in Shendong Mining Area,the source of low oxygen gas and gushing reasons were analyzed in working face,and control countermeasure for working face low oxygen is given.It shows that the coal seam in Shendong Mining Area is in nitrogen-carbon dioxide belt,and the low temperature oxidation of residual coal produces a large number of low oxygen gas in goaf;under the function of ventilation negative pressure and atmospheric pressure,gas emission is from the goaf to air return corner by air leakage passage,which causes low oxygen of working face.The prevention and control of low oxygen is comprehensive application of a variety of technical means;in terms of mine development,little leftover or not leftover lane as possible,reducing residual coal,goaf amounted to more than 5,keeping enough distance isolated coal pillar nearby coal face;in terms of safety monitoring,setting the oxygen sensors,warning signs,establishing an early warning system of the low oxygen;in terms of ventilation system,according to the actual conditions,using "U + L" type,"Y" type or pressure balancing ventilation system;in ventilation technology and management,plugging air leakage passage and releasing stress in goaf.关键词
工作面低氧/低氧气体/通风系统/采空区泄压/漏风封堵Key words
low oxygen of working face/low oxygen gas/ventilation system/pressure relief of goaf/air leakage plugging分类
矿业与冶金
