Sentence examples for return airways from inspiring English sources

However, 80% TIC is needed for all return airways.

Initially, the rock dusting standard in US coal mines was mandated that 65% incombustible content (IC) in non-return airways and 80% IC in return airways (Harris et al. 2010).

Differing with mine type, 60% and 70% are required in the intake and return airways for "non-gassy" mines and 75%and80%0% are required for "gassy" mines, respectively.

The roadways for a LLTCC coalface include headgate, tailgate, top return airway and open-off cut.

Based on related technical parameters of return airway section on working face 15108 of Shi Gang Coal Mine, ANSYS analysis model was created.

The methane flow rates of the high return airway inclined boreholes of panel 1112 1) are shown in Fig. 11.

The intake and return airway are set as a pressure inlet and outlet at 107,531 and 107,487 Pa, respectively.

Open image in new window Fig. 11 Methane flow curve of the high return airway inclined boreholes.

Our results show that enhancing ventilation flux can dilute the CH4 concentration of return airway or working face, but increase the risk of gob spontaneous combustion.

On the contrary, accelerating face advance rate can suppress gob spontaneous combustion, but easily cause CH4 concentration overrun of return airway or working face.

In addition, widening longwall panel could aggravate gob leakage flux and improve the CH4 concentration of return airway, while it might exert less influence on coal self-heating.