Heat Treatment and Ventilation Optimization in a Deep Mine

Table 2

The measured air volume of main roadway before and after transformation of ventilation system.

Ventilation tunnel	Preoptimized air volume (m^3/s)	Optimized air volume (m^3/s)	Changing of air volume (m^3/s)
1118 m pithead inlet air tunnel	22.3	37.0	+15.7
Blind shaft entry	21.5	36.3	+14.8
640 m level main air tunnel	21.1	35.1	14.2
640 m level leading to the main return air tunnel	18.3	12.1	−6.8
440 m inclined shaft airway	5.4	22.5	+17.4
440 m level return air well	5.2	10.2	+5.4
440 m level working face	0.2	2.9	+2.7
280 m inclined shaft airway	0	6.8	+6.8
280 m level return air well	0	6.2	+6.2
280 m level working face	0.1	3.0	+2.9