Report: APP CMHS Project 1

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3.5.1. Gas Explosion Control

A major project on the development of gas explosion prevention technologies was completed in collaboration with Huainan Mining Group of China (Mitsumasu, 2007). The project included four components, namely, 1) a centralised monitoring system in gas drainage pipes, 2) improvement in gas drainage efficiency, 3) ventilation control, and 4) an underground radio communication system. The project was implemented in Zhangji mine of Huainan Coal Mining Group.

Centralised Monitoring in Gas Drainage Pipes

A centralised monitoring system was established with the project to monitor the gas condition of the gas drainage pipelines in Zhangji mine. The monitored parameters include methane concentration, gas flow rate, temperature, suction pressure and carbon monoxide concentration. One of the installation sites for the system and the display of the monitored results are shown in Figure 55 and Figure 56 respectively.

Figure 55 Centralised gas drainage monitoring

Figure 56 Monitoring results

Improvement in Gas Drainage Efficiency

To improve gas drainage efficiency, a directional gas borehole drilling system was introduced to Zhangji mine. The system includes a downhole motor and a direction control system (DDM-MECCA) provided by Advanced Mining Technologies in Australia, and a drill rig manufactured by Toa Tone Boring Co. in Japan, as shown in Figure 57.

Figure 57 Directional drilling and downhole surveying

Underground Radio Communication System

Underground radio communication systems were introduced at Japanese coal mines in the 1960s. Underground-surface communication was accomplished using both telephone and radio systems. At Zhangji mine, a 800 MHz Band (Ultra High Frequency or UHF) underground communication system was introduced and applied. It provided an additional communication means with clear-voice transmission in Zhangji mine, as shown in Figure 58 and Figure 59.

Figure 58 UHF radio system

Figure 59 UHF radio

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