Key technology and equipment research and development of improving coal seam permeability by high pressure air blasting

According to the actual condition with difficult to improve permeability of coal seam with low permeability,the permeability improvement mechanism of air bla sting of high pressure was studied in the coal seam. And the permeability improvement equipment of air blasting of high pressure was studied.And both the remote control and the remote monitoring were achieved.The explosion was well carried on many times in the open.The whole set technology of air blasting of high pressure was formed. Lots of industrial tests were tested in the coal mine. The results showed that the permeability improvement effect was well achieved in the low permeability of coal seam wit h the permeability improvement technology of air blasting of high pressure.Meanwhile the technology which was safe and reliable, the rushing volume and extraction volum e of gas in the coal seam were increased,the time of gas extraction could be reduced,advancing speed of workface could be improved and the production of coal and gas C an be effectively increased.The new way was established for improving the low permeability of coal seam in China.