Research and application of ejector in treating low oxygen in working face corners
During normal mining operations,the corners of the mine face are prone to low oxygen levels,which can easily lead to breath-ing difficulties for workers during operation.Field tests show that the oxygen concentration in the return corner is in the range of 15.5％-17.5％,and it decreases as the surface air temperature rises.Therefore,a low oxygen prevention technology for the corner of the working face based on the principle of ejection was proposed.The technology was combined with on-site application,and the results show that the injection flow has a good effect on improving the low-oxygen environment in the return air corner of the working face.The best improve-ment effect was obtained when the injection flow direction was set at a certain angle to the return air roadway.Under this condition,an in-jection wind speed of 8 m/s can effectively eliminate the low oxygen phenomenon in the return air corner,and the overall oxygen concen-tration can be maintained at more than 19％.Based on the above research results,combined with the actual situation of the No.112207 working face,the ejector was applied and tested on-site.After the equipment was running normally for 7 days,the oxygen concentration in the return air corner of the working face was maintained at more than 18.5％,and the control effect was significant.
ejectorreturn air cornerlow oxygen phenomenonoxygen concentration
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