Study On The Law Of Gas Transport In High Gas And Full Mechanized Coal Face And Its Goaf

This thesis, the author discusses the transport of gas in full-mechanized mining working face and its goaf. Gas diffusion pattern in the airflow of normal runnel is analyzed. At the same time, the paper introduced the element method to measure the different gas emission percentage and gas density distribution in fully mechanized coal mining face, its goaf and the upper-corner. On the basis of data collecting from mine, the author analyze and summarize law in full-mechanized mining working face which including the emission source of goaf, the proportion of gas emission rate from goaf , the law of gas transport and the distributing of gas concentration, the thesis also analyze some factor that affect the gas emission in fully mechanized coal mining face and its goaf, the main factor are geology condition , air quantity, the velocity the working face is advanced, the ventilating pressure and the ventilation system The mathematical model of transport of gas in fully mechanized coal mining face and its goaf is established, use the relevant program simulating the condition of fully mechanized coal mining face and its goaf. The author bring forward the way to solve the problem of gas by gas drainage, balance press of airflow, rational ventilation system, etc. During this technique was applied in Lingzi No 1 mine of Zibo Shandong province, the effect was investigated and analyzed by tracking the process in the mine, results of this method were checkout practically.,...