Evaluation of the cavitation generator efficiency in the hydro impulsive loosening of a coal-bed

Zberovskyi, Vasyl; Zhulai, Yurii; Mirnyi, Serhii

doi:10.1051/e3sconf/201910900123

Cited by 3 publications

(1 citation statement)

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“…Thus, dimensions of safe extraction by means of a coal shearer should be specified with the help of a probe drilling or assumed as those being equal to the well length. Control results of hydroimpulsive disintegration by means of APSS-1 system support reliability of the research [10]. is determination coefficient.…”

Section: Resultssupporting

confidence: 55%

The results of monitoring of hydroimpulsive disintegration of outburst-prone coal seams using ZUA-98 system

et al. 2020

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The paper represents the results of monitoring and evaluation of the efficiency of hydroimpulsive disintegration of outburst-prone coal seams in the stopes of development mine workings using a system of sound detecting facilities. Methods of acoustic emission control have been considered as well as the monitoring tasks to evaluate rock mass conditions before the procedure and after it inclusive of the results of sound accompaniment of hydraulic disintegration of the coal seam. It has been determined that the higher concentration of stresses within the rock mass is, the more efficient action of high frequency self-oscillations of cavitation transmitter is on both the fissuring and changes in gas-dynamic state of the coal seam. It has been recommended to apply a mode of impulsive fluid pumping under the conditions where coal seam is in the stress-strain state.

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Section: Resultssupporting

confidence: 55%

The results of monitoring of hydroimpulsive disintegration of outburst-prone coal seams using ZUA-98 system

et al. 2020

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Hydrodynamic cavitation in solving the problem of the gas dynamic factor of coal mines

Zberovskyi,

Krykovskyi,

Zhulay

et al. 2024

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The monograph is devoted to the solution of problems existing in the study of the gas-dynamic factor and methods of hydraulic action on coal seams, which are dangerous due to coal and gas emissions. General information about the problems and research directions of the gas dynamic factor in coal mines is considered. The results of studies of the structural and textural structure of hard coal, the interaction of solid and gaseous components of emission-hazardous coal seams as a coal-gas system formed by the genesis of fossil organic matter are summarized. The influence of man-made factors on the transformation processes in the geological layer is considered. The physical and technical foundations of the cavitation flow of liquid implemented by a Venturi tube are summarized. The results of a theoretical and experimental study of the periodically discontinuous cavitation flow of liquid in a hydraulic system, methods of mathematical and experimental calculations of dynamic parameters of the process are given. The results of tests of pressure pulse generators during coal humidification and the conditions of their use in hazardous coal seams are analyzed. The results of the improvement of the cavitation device for the purpose of its use in the conditions of hazardous coal-rock massif are given. The research methodology and substantiation of the parameters of the dynamic load of hazardous coal seams during their hydraulic loosening is presented, which consists of: studies of the strength of hazardous coal, the method of calculating coal load parameters and the method of engineering calculation of the dynamic parameters of the hydro-impulse action device, research schemes of geometric and dynamic parameters of cavitation devices and the process of hydro-impulse actions, studies of the stress distribution around the well during the transmission of pressure pulses to the coal seam. The methods of control and evaluation of the effectiveness of hydro-impulse loosening of hazardous coal seams in the pits of preparatory workings and the method of numerical research of the state of the gas-bearing coal seam in the pits of the mining workings during hydraulic loosening are considered. The parameters of the developed method and its economic efficiency are given. The monograph is intended for engineering and technical workers of coal mines, specialists in the field of gas-dynamic phenomena research and combating them, as well as for students and postgraduates of relevant specialties.

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Justification of decisions regarding the water supply to the population in the mining regions in the conditions of local resources insufficiency

Bubnova,

Babii,

Riumina

et al. 2023

Geoteh. meh.

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The issue of the possibility of providing the population with water through the available resources of mine/quarry water formed during the extraction of minerals is considered. The authors show that there is an insufficient level of local water resources in Ukraine. The situation is especially negative in industrialized regions with high water consumption. However, in these regions, the mining industry is widely developed, and their activity is accompanied by a different level of mine workings watering. Today, mine/quarry waters are pumped out and, after sedimentation, discharged into the hydrographic network, polluting it. It is shown that the most rational is to collect, purify and use mine water. The methods of mathematical statistics were used in this work: correlation-regression and dispersion analyses, which were used to analyze data from 10 mines in the city of Kryvyi Rih over a five-year period. The annual level of water inflows, the depth of deposit development, volumes of ore extraction, areas of license areas, geological characteristics of ore deposits, etc. were analyzed. A noticeable correlation was established only between the levels of water inflows and the depth of deposit development and volumes of ore extraction. Therefore, further the multifactorial analysis of these factors was performed. During the preliminary analysis, it was established that there is a powerful dyke between the Frunze and Pokrovska mines, and the mines located on different sides of this dyke often differ in terms of water inflows. Because of this, the northern and southern groups of mines were chosen, the data for which were processed separately. The relationship between water inflows, the depth of deposit development and production volumes was analyzed according to linear and various non-linear dependencies. The exponential dependence of water inflows on the depth of deposit development and the logarithmic dependence on the volumes of extraction show the highest correlation coefficient (0.83–0.86). According to the dependencies given in the article, it is recommended to determine forecasting water inflows for the design of mine water treatment systems for drinking water supply. In the article, a general technological scheme with separate collection, sedimentation and treatment of mine waters is proposed. For the conditions of Kryvyi Rih, this will cover almost half of the population's water consumption. Keywords: water resources, mine waters, discharge, regularities, water supply, treatment.

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Evaluation of the cavitation generator efficiency in the hydro impulsive loosening of a coal-bed

Cited by 3 publications

References 1 publication

The results of monitoring of hydroimpulsive disintegration of outburst-prone coal seams using ZUA-98 system

The results of monitoring of hydroimpulsive disintegration of outburst-prone coal seams using ZUA-98 system

Hydrodynamic cavitation in solving the problem of the gas dynamic factor of coal mines

Justification of decisions regarding the water supply to the population in the mining regions in the conditions of local resources insufficiency

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