The measurement principle and technology of LUXZ procession vortex intelligent flowmeter specially used in the high pressure gas measurement is introduced, comparison of the two pressure loss calculation methods of procession vortex intelligent flowmeter resulted in a calculation formula suitable for Harbin Petrochemical Company.

Fully mechanized caving mining technology with high mining height in high gassy and soft thick coal seam of Tunliu Mine;

Discussion on fully mechanized caving mining in seam with high gassy and coal/gas outburst potential;

Analysis of mining technology for a fully mechanized sublevel caving face in three-soft thick seams of high gas;

With the idea of safe and high-efficient exploitation of coal and gas in high gas content coal seams, in Panji mine 1 of Huainan city the experimental research of safe and high-efficient exploitation of coal and gas, and gas extraction in long distance was carried out.

The conception of the safe and high-efficient exploitation system of coal and gas was put forward in high gas content coal seams.

1 in Xing\'an Coal Mine,the characteristic of spontaneous ignition and control measure at the fully mechanized face with caving of roof coal,in high gas content and large inclined angle coal seam are aggregated and analyzed.

The forecast technique of high gas zone in coal-mine;