Assessment of Emergencies in Return Air System Design
B. P. KAZAKOV1, A. V. SHALIMOV2, N. A. TRUSHKOVA2
1Perm National Research Polytechnic University, Komsomol’skii pr. 29, Perm, 614990 Russia
2Mining Institute, Ural Branch, Russian Academy of Sciences, ul. Sibirskaya 78a, Perm, 614007 Russia
Keywords: депрессия, рециркуляция, вентиляционная сбойка, предельно допустимая концентрация, аэродинамическое сопротивление, напорная характеристика, рудники, depression, recirculation, vent cross cut, critical concentration, aerodynamic resistance, head characteristic, underground mines
Abstract
The upside potential of an underground mine ventilation by return air systems is analyzed in the article. It is shown that subsidiary air supply depends on the ratio of the pressure head of a recirculating draught producer to the mine depression at the recirculating draught producer site. By calculation of the actual example, the authors prove that air leaks can cause emergencies due to drastic reduction of fresh air supply in working areas.
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