A novel model for rapid correcting airflow velocity in semicircular arch tunnel of coal mine
MetadataShow full item record
Accurate determination of air quantity delivered in underground coal mine tunnels is essential to ensure that the ventilation system is underground normal operation. Currently, the location of airflow velocity sensor hanged up in the semicircular arch tunnels of an underground coal mine is only based on a miner's experiences. Then, by comparing the velocity records obtained from sensors with ventilation engineers' onsite measurements, a set of correction factors are determine to correct and to derive the "real" airflow velocity. Apparently, this method is deeply subjected to the accuracy of onsite measurements and is prone to result in serious errors, and then to degrade the reliability of underground monitoring system. Therefore, the research works conducted in this paper aims to develop a fast and reliable model to rapidly correct the airflow velocity of semicircular arch tunnels in underground coal mines. By using theoretical analysis, numerical simulation and field experiments, the air velocity distribution pattern in the semicircular arch tunnel is investigated. The relationship between the point-monitored airflow velocity and the cross-sectional average velocity is analyzed. Then, a model with the error less than 5% for rapid airflow velocity correction is proposed, which ensures that the "real" average air velocity in the tunnel can be accurately obtained by using the point-monitored velocity after correction.
Showing items related by title, author, creator and subject.
Cheng, Jianwei; Li, S.; Zhang, F.; Zhao, C.; Yang, S.; Ghosh, A. (2016)© 2016 Elsevier Ltd. Mining coal seams with high coal gas content and coal spontaneous combustion (SponCom) risk is often a challenge for mining engineers. Control measures for maintaining the gas concentration under the ...
Besa, Bunda (2010)The decline is a major excavation in metalliferous mining since it provides the main means of access to the underground and serves as a haulage route for underground trucks. However, conventional mining of the decline to ...
Computational fluid dynamics study of tracer gas dispersion in a mine after different ventilation damage scenariosXu, Guang; Jong, E.; Luxbacher, K.; Ragab, S. (2012)Tracer gases are an effective method for assessment of mine ventilation systems, but their dispersion characteristics can differ substantially as ventilation parameters, such as flow path and velocity, vary. This research ...