Study On Methane Controlling Technology Of The Goaf In Fully Mechanized Caving Face Characterized By Coal Seam Of High-Content Methane And Easily Spontaneous Combustion

Taking great ultralimit of up-corner gas on 1504 working face in Jiaxin colliery of Shanxi province as background, the author have observed this fully mechanized caving face characterized by high-content methane and easily spontaneous combustion on site.To the working face's character of high-content methane and easily spontaneous combustion,first of all,this paper analysed various kinds of techniques about up-corner methane controlling and goaf breeding fire controlling,compared their relative merits, and prioritised drainage technique taking account of both methane controlling and fire protection.Subsequently,this paper reviewed the research status of distribution law on leaked air in goaf which is a theoretical basis of drainage technique.According to the characteristics of goaf on fully mechanized caving face with high-content methane, by making use of the theory and experiment relevant to permeation fluid mechanics, this paper carried out data fittings about oxygen concentration, gas consistence, pore distribution, permeability coefficient, pressure distribution, oxygen consumption,etc. in this goaf based on field observation data, which was combined with methane migration performance and influence factors on tfi-zone of spontaneous combustion in this fully mechanized caving goaf. Moreover, this paper established mathematics model on flow field of leaked air in this fully mechanized caving goaf characterized by high-content methane and easily spontaneous combustion, which utilized seepage models of goaf airflow and mathematics models on concentration field of oxygen together with methane in loose coal. Furthermore, this paper studied leaked air conditions in this fully mechanized caving goaf characterized by high-content methane and easily spontaneous combustion with numerical simulation algorithm via FLUENT component of ANSYS software. Simulation results were closer to practical situations. Distribution laws on leaked air in goaf were summarized combining on-site observation with simulation results, which was applied to analyse the causes about great ultralimit of up-corner gas in fully mechanized caving goaf characterized by high-content methane and easily spontaneous combustion and instruct the up-corner gas controlling together with goaf fire protection on site.The application effects were better.