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Загальна кількість знайдених документів : 11 Представлено документи з 1 до 11 |
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| 1. | 
Lozynskyi V. G. Experimental study of the influence of crossing the disjunctive geological fault on thermal regime of underground gasifier [Електронний ресурс] / V. G. Lozynskyi, R.O. Dychkovskyi, V.S. Falshtynskyi, P.B. Saik, Ye.Z. Malanchuk // Науковий вісник Національного гірничого університету. - 2016. - № 5. - С. 21-29. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2016_5_6 Purpose. Determining the impact of changes of the geological faults amplitude without breaking the continuity of coal seams and the temperature conditions of underground gasifier based on the experimental data during underground coal gasification. Methodology. Methods of comparative analysis and mathematical modeling, experimental bench testing were used. Findings. The scheme of determining the time of crossing geological fault according to thermocouples was developed. Based on this scheme the analysis of changes of the temperature during displacement amplitude of geological fault variation up to 0,9 of coal seam thickness was conducted. Average time deviation of crossing the fault plane of disjunctive geological fault with underground gasifier was received. Established values make it possible to determine the output of underground gasifier on stable operation regime by a temperature factor. Based on the experimental data it was defined that with increase in the amplitude of geological fault by more than 0,75 of coal seam thickness the process of underground coal gasification turns into the process of underground coal combustion. The results of the research will allow making adjustments to the calculation of heat balance of the gasification process. Originality. It was found that with increase in the amplitude of disjunctive geological faults there appears additional loss of heat resulting from convection heat transfer in the place of coal seam fracturing and reducing of its emission due to changes in the combustion face of underground gasifier. Practical value. Obtained results of bench experimental studies with sufficient precision for practical application can be used to determine the parameters of thermal balance and thermal regime of underground gasifier and provide an opportunity to expand the field of application of an underground coal gasification technology near geological faulting zones and potentially involve substandard deposits of hard coal for underground coal gasification. It will give an opportunity to receive generator gas, chemical products and power energy. | ||
| 2. |
Saik P. B. Revisiting the underground gasification of coal reserves from contiguous seams [Електронний ресурс] / P. B. Saik, R. O. Dychkovskyi, V. H. Lozynskyi, Z. R. Malanchuk, Ye. Z. Malanchuk // Науковий вісник Національного гірничого університету. - 2016. - № 6. - С. 60-66. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2016_6_9 Purpose. Substantiating of contiguous coal seams coefficient during application of borehole underground coal gasification technology based on dependences of interstratial rocks subsidence on gasification duration. Methodology. Using stand experimental research and methods of computer modeling we obtained the dependences of interstratial rocks subsidence in terms of their thickness change, alternating thickness of coal seams and duration of the gasification process. To reflect the geomechanical situation of rock mass around underground gasifier, license software Flac 5.00 was used. For data processing and building of synthesis dependences, the method of multiple regression using generally accepted data processing systems - Excel-2013 was used. Findings. The obtained inequality allows setting the coefficient of contiguous coal seams during the application of underground gasification technology. Setting this factor makes it possible to assess mining and geo-logical conditions of coal seams occurrence with further rational order of their gasification. For values of contiguous coefficient 5,5 - 5,7, gasification of coal seams can be carried out both in ascending and descending sequence. In this case, there is no need to preserve the allowable distance between combustion faces on adjacent seams. Originality. To determine the contiguous of coal seams, a mathematical mechanism was developed, whose effectiveness is confirmed by computer simulation of rock massif that contains an underground gasifier and by research on a special test bench installation. The difference between the results was less than 24 %. Practical value. Dependence of interstratial rocks subsidence at changing duration of the gasification process describing the development of possible formation of gas-permeable cracks in interstratial rocks ensuring technological process was established. The obtained conditions of contiguous coal seams allow providing rational orderof mine workings. | ||
| 3. |
Falshtynskyi V. S. Formation of thermal fields by the energy-chemical complex of coal gasification [Електронний ресурс] / V. S. Falshtynskyi, R. O. Dychkovskyi, P. B. Saik, V.H. Lozynskyi, Cabana E. Caceres // Науковий вісник Національного гірничого університету. - 2017. - № 5. - С. 36-42. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2017_5_8 Purpose. The objective is to generate thermal energy from basic segments of the energy-chemical complex formed on the basis of borehole underground coal gasification with determination of its operation modes. Methodology. The set engineering tasks were performed using, analytical studies, bench studies and field studies represented in research projects, patents, and feasibility studies concerning construction and scientific support while equipment operating of a pilot mine gasifier under the conditions of solid fuel seam gasification in the context of excessive fissuring of rock mass enclosing the gasifier. Studies of thermal and power indices of the station for coal gasification were carried out with the help of Information Program "MTB BUCG" ("Material and Thermal Balance of Borehole Underground Coal Gasification") developed by the researchers of the Department of Underground Mining and the Department of Chemistry (State Higher Educational Institution "National Mining University"). Besides, the Program was piloted using industrial gasifier at experimental mine "Barbara" (Katowice, Poland). Findings. Basic indices of coal gasification station depending upon a type of forced-draft mixture for an underground gasifier were determined. Studies concerning the efficiency of thermal energy generation were carried out using rocks enclosing the underground gasifier and generator gases being the basic heat generating segments of the energy-chemical complex for coal gasification being formed on the territories of operating coal mines or mines at the stage of their closure. Prospects of gasification and thermal energy generation using rock disposals of coal mines have been estimated. Modes of internal heat provision of heat-generating segments of the energy-chemical complex have been determined. Originality. Dependencies of heat-exchange distribution within roof rocks in the process of coal seam gasification depending upon the length of a reaction channel, zones of thermochemical reactions in it and methods of heat exchange have been obtained. Dependence of payback period of cogeneration plant in terms of underground coal gasification on electrical energy and gasification product (generator gas) has been determined. Graph of thermal energy generation in terms of different operation modes of basic segments of energy-chemical complex has been constructed. Practical value. Technological scheme of a thermal utilizer has been developed. The plant provides possibility of thermal energy utilization in the process of coal gasification within the seam occurrence. Basic modes of thermal energy generation at the coal gasification station being a heat-generating segment of the energy-chemical complex have been determined. | ||
| 4. |
Falshtynskyi V. S. Substantiation into "rock massive – underground gasifier” system adaptability of Solenovskyi site in the Donetsk coal basin [Електронний ресурс] / V. S. Falshtynskyi, R. O. Dychkovskyi, P. B. Saik, V. H. Lozynskyi, E. C. Cabana // Науковий вісник Національного гірничого університету. - 2018. - № 3. - С. 14–21. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2018_3_4 | ||
| 5. |
Dychkovskyi R. O. Technological, lithological and economic aspects of data geometrization in coal mining [Електронний ресурс] / R. O. Dychkovskyi, V. H. Lozynskyi, P. B. Saik, Yu. V. Dubei, Cabana E. Cceres, Ia. T. Shavarskyi // Науковий вісник Національного гірничого університету. - 2019. - № 5. - С. 22-28. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2019_5_6 Purpose. Creation of a favorable geomechanical situation and estimation of economical parameters at the mining area according to the selection of the relevant technical and technological justification and operating modes of the mechanized fastening based on the planning of zones of variable stresses. Methodology. Methods of mathematical modeling for determination of loads for fastening of mechanized complexes, experimental studies on stressed-deformed state of the rock mass are applied, on the basis of which rational parameters of mining and management mining pressure are formed. Findings. Using the developed method of data geometrization, the lithological and geological structure of the rock mass was restored on the intersections of the surrounding wallface two of preparatory workings. On this basis, a change in the stress-strain state of a rock massif is established. This makes it possible to set the loadings on the fastening of mechanized complexes. This approach establishes the mathematical dependencies that determine the zones of elevated and lowered mining pressure. For the measure of transition, the so-called coefficient of lithological difference is defined. This parameter provides the possibility not only to evaluate the geomechanical situation at the extraction site, but also to establish a marginal zone for the development of reserves with traditional and radical technologies. An economic evaluation of the proposed technical and technological measures has been held separately. The results of the research will allow justifying the effective mining of coal reserves in particular geological conditions. Originality. The dependence of the lithological difference formation of rocks and stresses of the rockmass to create conditions for the development of the coal reserves has been established. An economic evaluation of the decisions was made using the well-known methodology of UNIDO. Practical value. Obtained results of experimental studies with precision sufficient for practical application can be used to determine the parameters of underground mining and provide an opportunity to extract the coal reserves at an economically suitable level. The proposed technological solutions were checked in practical conditions for the development of the coal reserves at the site of a DTEK company mine. | ||
| 6. |
Saik P. B. Efficiency of underground gas generator in consideration of the reverse mode [Електронний ресурс] / P. B. Saik, V. S. Falshtynskyi, V. H. Lozynskyi, E. C. Cabana, M. S. Demydov, R. O. Dychkovskyi // Науковий вісник Національного гірничого університету. - 2020. - № 4. - С. 39-46. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2020_4_8 Purpose. Activation of the processes of well underground coal gasification with the consideration of the reverse mode of the underground gas generator based on the balanced state between the oxidizing and reducing zones of the fire face. Methodology. The underground gas generator efficiency was evaluated based on the analytical and laboratory studies. Analytical substantiation of the implementation of reverse operations in terms of the underground gas generator is based on the quantitative parameters of coal gasification in the oxidizing and reducing zones of the underground gas generator and their advance rates. Laboratory studies were carried out on a stand unit with the modeling of the coal gasification processes. Findings. Efficiency of the underground gas generator operation by reversing with blowing mixtures has been substantiated, which helps to maintain the balance between its oxidizing and reducing zones. Time periods for the reverse operations have been identified on the basis of the averaged value of concentrations of the combustible generator gases on the outlet from the modeled underground gas generator. Originality. Dependences of the changes in displacements of the active underground gas generator zones in terms of the implemented reverse of blowing mixture supply have been obtained with the consideration of mining and geological conditions of the occurrence of coal seam c | ||
| 7. | 
Falshtynskyi V. Innovative aspects of underground coal gasification technology in mine conditions [Електронний ресурс] / V. Falshtynskyi, P. Saik, V. Lozynskyi, R. Dychkovskyi, M. Petlovanyi // Mining of mineral deposits. - 2018. - Vol. 12, Iss. 2. - С. 68-75. - Режим доступу: http://nbuv.gov.ua/UJRN/rr_2018_12_2_10 | ||
| 8. |
Dychkovskyi R. Research into stress-strain state of the rock mass condition in the process of the operation of double-unit longwalls [Електронний ресурс] / R. Dychkovskyi, Ia. Shavarskyi, P. Saik, V. Lozynskyi, V. Falshtynskyi, E. Cabana // Mining of mineral deposits. - 2020. - Vol. 14, Iss. 2. - С. 85-94. - Режим доступу: http://nbuv.gov.ua/UJRN/rr_2020_14_2_12 | ||
| 9. |
Vladyko O. Formation of the models of mining enterprise management [Електронний ресурс] / O. Vladyko, D. Maltsev, E. C. Cabana, Ia. Shavarskyi, R. Dychkovskyi // Naukovyi visnyk Natsionalnoho Hirnychoho Universytetu. - 2022. - № 3. - С. 30-36. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2022_3_7 Purpose. To develop a comprehensive model of a mining enterprise, to define types of models for mathematical modelling at all management levels, and to determine principles and approaches to the formation of new input data concerning both technologies and their subsystems while combining the technologies. Methodology. To achieve the goal, a systems approach is used, which allows selecting the types of models for modelling the enterprise activities in terms of technologies and subsystems and determining the method of generating own input data for them. For this purpose, the following was completed: the available literature and patent sources were processed and generalized; scientific and technical papers on the selection and application of the varieties of models in mining were analyzed; the principles and individual approaches to the input data formation for mathematical modelling were considered. That makes it possible to select a software mechanism and create simulation models for effective management of a mining enterprise. Findings. Types of models for mathematical modelling at the operational, tactical, and strategic levels of enterprise management were determined and substantiated. Connection between the types of models used by management levels was specified. An expert survey for modelling at the operational level, simulation modelling at the tactical level, and dynamic programming at the strategic level of management were selected. A schematic diagram of modelling of a mining enterprise, whose structure included technologies and their subsystems at various management levels, were developed. The principles of input data formation to model all subsystems, either operating or being prepared for their implementation, were studied. The authors' own approaches to the input data formation at the levels of management and technological subsystems were defined. Originality. While performing a particular solution of the discrete problem by Bellman method, dependences of minimizing the operations for enterprise management while forming a technological chain of a mine, provided meeting the requirements of production process continuity, were obtained. These studies are aimed at establishing a complex information system with its division into elements, each of which is then used to simulate the whole mining enterprise. Practical value. It means developing a comprehensive model of a mining enterprise, determining the types of models for mathematical modelling at all management levels, establishing a new way of input data formation in terms of both technologies and their subsystems with the implementation of additional mineral-mining technologies. | ||
| 10. |
Nikolsky V. Thermodynamics of the developing contact heating of a process liquid [Електронний ресурс] / V. Nikolsky, R. Dychkovskyi, A. Lobodenko, H. Ivanova, E. C. Cabana, Ja. Shavarskyi // Naukovyi visnyk Natsionalnoho Hirnychoho Universytetu. - 2022. - № 2. - С. 48-53. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2022_2_10 Purpose. To study development of contact heating of a process liquid basing on the main principles of thermodynamics in terms of specially developed equipment. Methodology. The research of efficient operation of plants for contact heating of process liquids was based on analytical and laboratory studies. The analytical studies relied on determining heat and material balance of the process on the basis of quantitative parameters of the obtained heat, basing on contact heating of water (process liquid) as the end (intermediate) heat carrier. Test studies were carried out in terms of special plants for modelling thermodynamic processes of contact liquid heating. Findings. The efficiency of operation of the special equipment was substantiated by improving its design that makes it possible to preserve the balance between temperatures of liquids on the inlet and outlet of a special heating plant. Basing on the averaged value of the parameters characterizing thermodynamic transformations, time periods of the process liquid heating were identified. Originality. Dependences and numerical values of changes in maximum equilibrium temperature (boiling temperature) and relative amount of the evaporated water on the specified excess-air coefficient during the natural gas combustion in the submerged combustion devices were obtained. Parameters of the temperature field distribution in the heating system were obtained basing on the design features of a heating plant. The research data were aimed at identifying the efficiency of system operation depending on water consumption at the device inlet. The research was carried out in terms of one-stage and two-stage heating of a process liquid. Practical value. Design of a test plant for thermochemical water heating was improved; that helped simplify a process of the heating plant control to get maximum amount of heat energy. The efficiency of its operation was substantiated by controlling the temperature field distribution in the heating devices. | ||
| 11. | 
Saik P. Studying the features of the implementation of underground coal gasification technology in terms of Lvivvuhillia SE [Електронний ресурс] / P. Saik, R. Dychkovskyi, V. Lozynskyi, V. Falshtynskyi, E. Cabana, L. Hrytsenko // Геотехнічна механіка. - 2020. - Вип. 155. - С. 78-87. - Режим доступу: http://nbuv.gov.ua/UJRN/gtm_2020_155_12 | ||
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