Abstract
Abstract Dustiness of the mine atmosphere during carrying out exploitation is one of the most hazardous factors threaten to health and life of employees. Also it is large hazard for all type of mechanical and electrical devices operating in mining headings. Coal dust is also very dangerous due to its possibility of explosion. Currently applied technologies of rock mass mining process, entire transport process of output and applied ventilation system cause that rock and coal dust is presented practically in each of the mining heading. Practically, is impossible to eliminate dust from mining headings. However, one can determine its parameters and potential ways its displacement. In the paper there is presented modeling research methodology of dustiness state in a driven dog heading. Developed model is the basis for this methodology, including the diphase flow of mixture of air and dust in the mining heading. Analysis was performed for real driven dog heading. Based on performed analyses, distributions of particular fraction and movement trajectories of selected dust grains were determined. Developed methodology gives a lot of opportunities for analysis of dustiness state in mining headings and in other compartments. It enables to determine parameters of particular grains and their impact on ventilation parameters of the air stream in the tested headings. Obtained results can also be used to reduce dust hazard.
Highlights
Occurrence of dust hazard in coal hard mining is connected mainly with rock mass mining process [1, 2]
Dust formed during coal mining of body the coal and driving of dog heading and haulage of dust output, floats in the mining atmosphere and through ventilation system goes into majority of mining headings, even those far away from place of its occurrence, causing their pollution
Tests of dustiness occurring in the driven dog heading were performed for model in which two-phase medium formed from continuous phase of the air and discrete phase in a form of dust grain
Summary
Occurrence of dust hazard in coal hard mining is connected mainly with rock mass mining process [1, 2]. The ventilation system transfers dust particles to all area of mine, which cause that practically dust is presented in all headings This (coal and rock) dust in significant way threatens life and health of mining crew [1, 2, 5, 6, 7]. Very significant meaning for assessment of dust hazard degree in a driven mine face of dog heading has knowledge of the location of zones with highest dustiness This knowledge constitutes the basis for carrying out preventive actions in order to reduce its concentration. For this reason, it was Management Systems in Production Engineering 2020, Volume 28, Issue 2 decided to develop method for determination of dust zones and dust stream parameters with use of the modeling tests These tests were performed for a real driven dog heading. Authors have hope that developed method based on spatial diphase model will be able to successfully be used for larger scale for diagnose and forecast dustiness state in mining headings
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