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Regularity of Gas Distribution in Sloping Heading Face with Auxiliary Ventilation

Author: LiuJinJin
Tutor: GaoJianLiang
School: Henan Polytechnic University
Course: Safety Technology and Engineering
Keywords: Local exhaust ventilation Heading Face Inclined roadway k - epsilon model Gas Distribution
CLC: TD712
Type: Master's thesis
Year: 2011
Downloads: 72
Quote: 1
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Abstract


With the increasing depth of the mine mining , gas disaster is more serious, in order to effectively prevent the accumulation of gas caused by gas explosion and gas outburst accident you need to accurately predict the mine tunnel gas distribution , gas distribution and the roadway romantic flow field , Merry flow field calculation . Heading Face Merry flow field simulation solver , a fully developed state of the turbulence using the RNG k - epsilon two-equation model , the distribution of the numerical simulation of the wind speed in the tunnel , the flow field inlet airflow turbulent kinetic energy k and turbulent kinetic energy dissipation rate the value of ε has a different calculation methods . In this paper, the computation of turbulent kinetic energy k and turbulent kinetic energy dissipation rate ε using different values ??Merry flow field , and with the test results were compared to determine the the local airflow distribution turbulent kinetic energy k and turbulent kinetic energy dissipation rate ε value , has been heading face close to the actual flow field . On the basis of the flow field of study heading face romantic tilt laneway gas mixed with air mathematical model inclination to tilt roadway , air volume numerical simulation of gas distribution and gas accumulation . The simulation results show that in the case of low return air gas concentration , tilt tunneling face there are still a range of high density gas region . When the wind volume , tilt angle and back Merry average concentration of the gas being equal , upward-sloping heading face of high density gas region than the downward-sloping high density gas region . Back to the romantic average concentration of the gas constant , the gap between the high density gas regions of high density gas regions with the air flow and gas emission increases, the heading face upward-sloping downward sloping gradually reduced, but upwardly inclined high density gas region is still big than the downwardly inclined . When the tilt angle and gas emission volume is the same, the elimination of gas overrun area , the wind than the downward-sloping upward sloping roadway needs to be a large amount of wind .

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CLC: > Industrial Technology > Mining Engineering > Mine safety and labor protection > Mine atmosphere > Mine Gas
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