Page 193 - Advanced Mine Ventilation

Diesel Exhaust Control 173

Figure 11.4 Layouts of various situations when multiple diesel engines work in a single
roadway. (A) Layout of a long tunnel. (B) Layout of blind heading. (C) Simplified
representation of the layout shown in Fig. 11.5.

contaminated several times by the diesel engines before it finally gets discharged into
the return airways. This leads to a progressive rise in the concentration because of the
superposition of contaminations. To facilitate the mathematical analysis of this situa-
tion, suppose a number of carbon monoxide monitors are installed equidistantly along
the length of a roadway. The readings of CO are being continuously monitored, and the
time-weighted exposure of persons at each sampling point is calculated by averaging
the spot readings of concentration just as the calculation of TLV is supposed to be done