METHOD FOR DETERMINING FLOW OF AIR IN WORKED-OUT AREA OF WORKING FACE Russian patent published in 2017 - IPC E21F1/00 

FIELD: mining engineering.

SUBSTANCE: invention relates to mining engineering and can be used to determine the air flow rate passing through the worked-out area of a working face. The process includes an establishment of an average daily load for a working face, absolute methane abundance of a face space, air flow on development of a working area and concentration of methane in the mine air. At the same time, there is revealed the quantitative relationship between the average daily load on the working face and methane abundance of the worked-out area. A methane abundance of a worked-out area and the air flow flowing through the worked-out area shall be determined by the proportion of methane abundance of a working face of lava and explosive limits of methane concentrations in the mine air as per the relationships: I_w.a.=(a+вA)+n I_w.f. (1) and

(2) where I_w.a. - methane abundance of worked-out area of a working area, m³/min; A - average daily load on the working face, tons; a and в - empirical factors; n - methane abundance ratio of working face of lava I_w.f. (m³/min) in a methane abundance of worked-out area of an area, fraction.; Q_a - air flow flowing through the worked-out area, m³/min; c - explosive methane concentrations in the mine air, % (volumetric).

EFFECT: invention allows to eliminate the conditions for generation of explosive mixtures of methane gas in the working areas of gaseous mines due to reasonably set air flow flowing through the worked-out area of a working area.

1 dwg