DOI: 10.11799/ce202505012
Analysis of CO sources and the control measures for CO overrun in fully mechanized mining face of shallow contiguous coal seams
LI Chaoyue
ZHOU Chunshan
ZHANG Yulong
QI Jinlong
Abstract：In recent years,the CO overrun in the return air corner of the working face in Shendong mining area happened frequently,which seriously affected the coal mine safety.Therefore,we took the 22upper 104-1 fully mechanized mining face in Shigetai Coal Mine as the research object.A series of tests were carried out,to measure the original occurrence of CO in coal seams,the CO release rate from coal mass at room temperature,CO release during coal mining,and CO emissions from underground rubber tired vehicles,thus to systematically explore the source of CO in the return air corner.The results indicate that ambient temperature oxidation of leftover coal in goaf is the main source of CO,with a contribution rate of 75%;The CO contribution rates of coal cutting and tail gas from rubber tired vehicles are 13%and 12%,respectively;The original CO content in coal seams is almost zero.Based on the above conclusion,measures such as pressure equalization ventilation and spraying of inhibitors were proposed to suppress the oxidation of leftover coal in goaf and prevent CO leakage.Application of the measures showed that,the concentration of CO in the return air corner significantly decreased,from 42×10-6 to below 10×10-6,the problem of CO overrun was solved,providing guarantee for the safety production of Shigetai Coal Mine.
Keywords：close-distance coal seamsreturn air cornerCO overrunoxidation of leftover coalequal-pressure ventilation
Publication Date：2025-05-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 85-91 )