Abstract
The article presents a method for equipment designing and techniques to reduce methane ignition hazard, excessive dust in the place of operation and in conveyor transportation lines as well as methods to eliminate the risk of coal dust explosion. It describes technical solutions, the effects of these solutions and tests’ results related to effectiveness of the described air-water solutions as well as water spraying devices. The spraying systems used in longwall shearers and roadheaders, on conveyor belt transfer points as well as the spraying curtains in the roadways are described. A new approach to the assessment of the safety level in the zones protecting against coal dust explosion hazard is also given. Intensity of dust accretion along the explosion protecting zones is analyzed. The spraying device is suggested, the operation of which depends on dust concentration in the ventilation air. The article presents the results of tests on the effectiveness in dust reduction and suppression of methane ignition. The tests were carried out in the laboratory, on testing facilities and in-situ.
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