Factors influencing strength and direction of natural ventilation pressure in general mines to control mine airing

Abstract

The article presents three main factors, influencing the strength of natural ventilating pressure in general mines between the shafts: gas emission from mines (air density changes due to the change in concentration of other gases), changes of air parameters taken in by ventilating shafts, and air pressure due to the productivity shifts of the Main Fan Unit (or other devices for positive and negative control of air distribution). According to the experiment data the equations mentioned in other works for calculating natural ventilating pressure in general mines and taking into account the parameters of the air taken in are precise. Applying these formulas basing on the results of hydro meteorological forecast, whose accuracy in the short-term forecast is also high, it is possible predict the operating mode of the system of ventilation.

Improving environmental conditions of a Room and Pillar underground quarry using numerical modelling of the ventilation system

“…However, natural ventilation affects the functioning of fans; in some cases, it can induce fans to operate in non-optimal conditions (low efficiency) with the consequence of requiring more frequent maintenance or interventions to repair failures or malfunctions. In other cases, the effect of natural ventilation can even cancel out the effect of the mechanical ventilation, significantly reducing the supply of fresh air in the mine (Lyalkina et al 2020).…”