Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu最新文献

{"title":"Problems of prosecution for crimes against environmental security in the conditions of martial state","authors":"N. A Makarenko, O. Yu Makarenko, Yu. A Krasnova, O. V Nazymko, D. D Ivanenko","doi":"10.33271/nvngu/2023-5/122","DOIUrl":"https://doi.org/10.33271/nvngu/2023-5/122","url":null,"abstract":"Purpose. To conduct a study on the problematic issues of prosecution for certain offenses (crimes) related to environmental safety, conduct a study on the criminalization of violations related to environmental safety under martial law. To develop proposals for improving the norms of current legislation in this area. Methodology. The methodological basis of the study is a system of general scientific methods and approaches that provide an objective analysis of the subject under study. Findings. Taking into account the need to properly record the damage caused and obtain an evidentiary base for both national courts and international judicial authorities, it is expedient to urgently develop “Methods for determining damage caused to the natural environment as a result of armed aggression”, which should be approved by a resolution of the Cabinet of Ministers of Ukraine. This will allow obtaining an effective bylaw as quickly as possible. Also, in our opinion, it is expedient to develop the Law of Ukraine “On Establishing Damages Caused by Armed Aggression Against Ukraine” to provide in a broader scope both the appropriate methodology for fixing damages and the circle of authorized persons who can fix such damages. Additionally, it is necessary to provide for the obligation of local self-government bodies to carry out an environmental audit in the territories where hostilities are not taking place, or immediately after their end, with the aim of the fastest fixation of environmental damages and the circle of persons who caused them. Originality. New aspects of the issue of prosecution for crimes against environmental safety in martial law conditions were analyzed on the basis of the analysis of the domestic legal framework, reports and analytical conclusions of representatives of law enforcement agencies of Ukraine, as well as international treaties ratified in Ukraine, and proposals aimed at improving the norms were substantiated current legislation. Practical value. The results of the research are important for legal advisers, practicing lawyers and advocates, teachers and scientists engaged in the research on the relevant issues.","PeriodicalId":19101,"journal":{"name":"Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136104622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving the technology of extracting coal concentrate from fly ash from thermal power plants","authors":"M. Hlukhoveria, I. Mladetskyi, K. Levchenko, O. Borysovska","doi":"10.33271/nvngu/2023-4/033","DOIUrl":"https://doi.org/10.33271/nvngu/2023-4/033","url":null,"abstract":"Purpose. Study on the possibility of extracting coal underfire particles from the ash of the thermal power station by flotation. Intensification of the enrichment process of coal particles, development of a mathematical model for forecasting indicators of the ash function. Methodology. The method of fractional flotation was used to study the kinetics of the process of extraction of the valuable component. The technique of the planned experiment was applied, including the central composite rotatable plan of the second order for four factors affecting the ash content of the coal concentrate. Findings. According to fractional analysis, the concentration limit of coal particles was determined. During the flotation of fly ash, the best results were obtained on the EFM ejector type flotation machine, the yield of the foam product was 18.6 % with an ash content of 25.1 %, compared to the MFU mechanical type flotation machine, where the ash content of the foam product was 36.5 % with an average yield of 21.1 %. The optimal consumption of reagents at the level of no more than 3,500 g/t of the collector and foaming agent up to 250 g/t was determined experimentally, and the required flotation time was determined. Calculations were performed to determine regression coefficients and the degree of influence of factors on the flotation process. A mathematical model of the flotation process of TPP ash removal was determined, which characterizes the influence of the main factors. The graphs of the significance of the factors and the three-dimensional surface of the calculated response function were drawn up. Originality. The degree of influence of factors such as pulp pressure in the feed pipeline, collector consumption, foaming agent consumption, and flotation time on the process of beneficiation of TPP ash on the EFM ejector type flotation machine was determined. Practical value. The complex model makes it possible to predict the final indicators of the response function, namely the ash content of the secondary coal concentrate. The results will make it possible to improve the parameters of technological processes for the enrichment of TPP ashes.","PeriodicalId":19101,"journal":{"name":"Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44309974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of the stereomicrophotogrammetric method for the complex study of the Al-Cu-Mg alloys system","authors":"©. Uhl, Melnyk Melnyk O. V., A. Uhl, O. Melnyk, Yu. A Melnyk","doi":"10.33271/nvngu/2023-4/056","DOIUrl":"https://doi.org/10.33271/nvngu/2023-4/056","url":null,"abstract":"Purpose. To combine the stereophotogrammetric method for processing fracture surface images at the micro level with the results of a series of mechanical and metal fractographic studies with precision methods for scanning electron microscopy (SEM) and energy dispersive analysis (EDX) in order to determine the peculiarities and general laws of the fracture process of Al-Cu-Mg test samples. Methodology. In this work, the mechanical properties of Al-Cu-Mg samples after mild (recrystallization) annealing and subsequent natural aging and a sample without heat treatment were experimentally determined. At the next stage, SEM-stereomicrofractographic research on fractures and their three-dimensional reconstruction from the obtained stereo images were performed. EDX studies have been performed on various parts of the samples to determine the distribution of mass percentages of elements in the study areas. A comprehensive methodology for experimental studies of Al-Cu-Mg alloys was used in this work to obtain qualitative and quantitative information on the microstructure of fractures, which consisted of the following steps: determination of the mechanical properties of samples by traditional methods of macro- and microanalysis; study on stereopairs of the microstructure of fractures by the stereophotogrammetric method; identification of the chemical composition and structure of matrix precipitation particles by energy dispersive X-ray spectroscopy (EDX analysis). Findings. Our experiments have shown that with an increase in the time of natural aging, the hardness increases slowly and reaches a maximum hardness of 127 Hv30 after 97 hours, which does not decrease subsequently. After natural hardening, the average fracture strength increases to Rm 440.3 with a relative elongation of 21.8 %. Mechanical tests have shown that the tensile strength increases with the hardness value and, in contrast, the toughness decreases. The energy required to fracture the sample is 16 J, followed by transcrystalline cellular fracture. The precipitates have a diameter of approximately 2.5–3 microns. Originality. Comparing the results of mechanical and metallographic studies, it can be argued that the desired properties of Al-Cu-Mg samples appear after dispersion hardening, which confirms the optimal hardening conditions. The results of the photogrammetric evaluation of samples in the micro range demonstrate the flexibility and accuracy potential of photogrammetric measurement methods and their subsequent processing, interpretation, and integration with EDX analysis to select optimal study sites. Practical value. An integrated approach to the analysis of materials using the SEM stereomicrophotogrammetric method, mechanical and metallographic studies, and EDX analysis was tested in this work.","PeriodicalId":19101,"journal":{"name":"Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46829497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Substantiating a method for computer analysis of the stress-strain state of the tubbing erector manipulator mechanism","authors":"O. Panchenko","doi":"10.33271/nvngu/2023-4/062","DOIUrl":"https://doi.org/10.33271/nvngu/2023-4/062","url":null,"abstract":"Purpose. To develop and substantiate a method for computer analysis of the stress-strain state that occurs in the tubbing erector manipulator mechanism with several degrees of freedom, using modern computing complexes based on the finite-element method. Methodology. The research uses software complexes, with the help of which a calculation-theoretical apparatus has been created, which is intended for calculating dynamic and static loads that occur in the elements of the tubbing erector manipulator mechanism. The results of modeling the stress-strain state in the parts and nodes of this mechanism, obtained using the SolidWorks Motion and SolidWorks Simulation programs, have been compared. The errors in these results have been estimated. Findings. The effectiveness of the proposed analysis method, based on the combination of SolidWorks applications, in particular, SolidWorks Motion and SolidWorks Simulation, has been proven on the example of modeling the most complex design of the UT62 tubbing erector mechanism. Originality. For the first time, a method for computer analysis of the stress-strain state that occurs in the tubbing erector manipulator mechanism of the UT62 type has been developed and substantiated. The essence of the method is that initially, using the SolidWorks Motion application, the laws of motion of the motors are set. The tubbing erecting process itself is divided into discrete moments of time with the selection of parts in which the stress fields are calculated and with the determination of the maximum equivalent stress, using the Simulation Setup tool. The change in these stresses during the erecting cycle is analyzed, and if it is necessary to refine the data, the discrete time step of the mechanism motion is reduced. Specific information about the stress-strain state of the part is obtained in the SolidWorks Simulation application, using data imported from the SolidWorks Motion program about gravitational and inertial forces that occur in the tubbing erector mechanism. Practical value. The proposed method can be used for modeling the motion of mechanisms of different complexity, in particular, in the design of domestic tubbing erectors.","PeriodicalId":19101,"journal":{"name":"Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44021770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new mining method for reopening the opencast mine of Kef Essennoun","authors":"M. C. Mezam, M. A. Bachar Assed, M. Ould Hamou, S. Narsis, A. Benselhoub","doi":"10.33271/nvngu/2023-4/026","DOIUrl":"https://doi.org/10.33271/nvngu/2023-4/026","url":null,"abstract":"Purpose. To treat the stability problem of the phosphate Kef Essennoun quarry in the mining field of Jebel Onk located in the Northeastern part of Algeria. Methodology. To achieve these objectives, we started by monitoring the unstable area, using two monitoring systems: control stations and inclinometer. We then carried out a digital assessment of the Northwestern edge stability of the quarry under the current operating conditions of exploitation. After that, we proposed a new operating plan for the reopening of the depot under the required security conditions. At the end, we carried out an assessment of the edge stability, as the work to reopen and develop the Kef Essennoun quarry progressed. Findings. The results show that, under the current operating conditions of exploitation, the Northwestern edge of the Kef Essennoun quarry is unstable (FS < 1). The backfilling of the pilot pit of the mine, lead to the assurance of the mine walls stability, by increasing the values of safety factors with a rate of more than 30 %. Originality. The backfilling of the pilot pit of the mine and the resumption of top-down mining exploitation will ensure the stability of the quarry during and after the operating exploitation mining. Practical value. The study of the stability of the embankments bleachers, the edges of the quarries and the facings of the slag heaps during the open pit mining of useful ores deposits is an essential step that must be done gradually according to the development of mining works to guarantee the safety of personnel, materials, reserves and the environment.","PeriodicalId":19101,"journal":{"name":"Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47086025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adaptation of the controlling system of the machine-building enterprise to change in strategic goals","authors":"O. Tsyhanova, N. Katkova, I. Murashko, O. Hryshchenko, K. S. Burunsuz","doi":"10.33271/nvngu/2023-4/164","DOIUrl":"https://doi.org/10.33271/nvngu/2023-4/164","url":null,"abstract":"Purpose. To improve organizational and methodological and practical approaches to the formation of a controlling system at machine-building enterprises, which will ensure its adaptation following large-scale goals and will determine the degree of the approach of the enterprise to the set goal. Methodology. To achieve this goal, a set of general scientific and special methods was used: abstract-logical, monographic methods, induction and deduction – to define and generalize theoretical and methodological foundations of adaptive management, formation and functioning of the controlling system in adaptive management; abstraction – to determine the large-scale goals of the enterprise which characterize the stages of its development; formation of a set of indicators that will provide a clear formulation of strategic goals of the enterprise and their achievement at different stages of its development. Findings. The proposed organizational and methodological approach to the formation of a controlling system at machine-building enterprises ensures the adaptation of the controlling system following the large-scale goals of the enterprise, allows one to determine the degree of the approach of the enterprise to the goal, as well as locally (decentralized), quickly and adequately respond to the irritant, without the participation of all departments of the enterprise. For this, the goals of the enterprise are determined according to the corresponding perspectives at the stages of “survival”, “growth”, “stability”, and “socially responsible business”. For a complete and comprehensive description of the company’s goals achievement, the balanced scorecard along with the classic perspectives – “Finance”, “Clients”, “Business processes”, “Personnel”, is supplemented by additional perspectives – “Ecology”, “Energy efficiency” and “Society”. Each degree of goals has its indicators, which differ from each other in number – for the “survival” stage, fewer indicators are used, and for the “socially responsible business” stage, more; in addition, the target values of the indicators may change. Originality. The organizational and methodological approach to the formation of a controlling system at the machine-building enterprises has been improved, which, unlike the existing ones, provides for the possibility of adapting the controlling system following the large-scale goals of the enterprise and using a balanced scorecard. Practical value. Using the proposed approach will provide an opportunity for enterprises to adopt the controlling system to changing goals, control the degree of achievement of the set goals in various areas of activity, decentralize, and promptly eliminate the deviations that have arisen to achieve the set operational and strategic goals.","PeriodicalId":19101,"journal":{"name":"Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45866470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy transition: the future of energy on the base of smart specialization","authors":"A. Polyanska, Yuliya Pazynich, Kh Mykhailyshyn, V. Buketov","doi":"10.33271/nvngu/2023-4/089","DOIUrl":"https://doi.org/10.33271/nvngu/2023-4/089","url":null,"abstract":"Purpose. To justify the prerequisites of the energy transition as a necessary condition for the implementation of changes in the energy sector and the importance of the concept of smart specialization as a potential for generating investments for the implementation of measures within the framework of the energy transition. Methodology. The method for calculating the average annual rate of growth of renewable energy capacities was used. To substantiate the growth potential of investments in the energy transition in regions, the compound interest method was used, and an investment forecast was made based on the growth rates of foreign investments in Ukraine and the growth rate of global investments in low-carbon energy. Findings. The necessity of energy transition for Ukrainian energy industry is substantiated, and it is proposed to implement the policy of smart specialization for the implementation of energy changes. An example of coal-mining regions was considered, and attention was drawn to the importance of the development of the coal industry to ensure energy security, while the priority of the development of renewable energy sources was emphasized. Originality. The relationship between the implementation of the energy transition policy and the regional policy of smart specialization is substantiated, taking into account the provisions and content of modern regulatory acts on regional development and energy transition, as well as familiarizing with the experience of foreign countries. Practical value. The expediency of considering the issue of energy transition together with the implementation of the concept of smart specializations at the regional level is substantiated. This will make it possible to focus on energy sector to explore the prerequisites for the implementation of energy changes and to attract additional investments, taking into account the world experience of investing in low-carbon energy.","PeriodicalId":19101,"journal":{"name":"Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44994455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tectonics and gravity field structure of Central Kazakhstan","authors":"A. Abetov, A. Uzbekov","doi":"10.33271/nvngu/2023-4/018","DOIUrl":"https://doi.org/10.33271/nvngu/2023-4/018","url":null,"abstract":"Purpose. Identification of the nature of the manifestation of tectonic elements of different ages in Central Kazakhstan in gravitational fields based on the results of the calculation of regional, intra-crustal and local transformants. Methodology. Synthesis and analysis of the data on integrated interpretation and modeling of gravitational, geomagnetic, geothermal fields, the latest movements of the Earth’s crust and parameters of the seismic regime, tectonics and stratigraphy of rocks. Findings. Regional, intra-crustal and local heterogeneities in the lithosphere manifest themselves differently in blocks of Precambrian rocks, Early and Late Caledonides, Early and Late Hercynides. They may be associated with the processes of Paleozoic intracontinental rifting, with the rise of mantle matter and its emplacement into the Earth’s crust, followed by the manifestation of Late Paleozoic orogenesis, doubling of the thickness of the Earth’s crust, outpourings of magmatic formations. Originality. It is established that large gravitational minima are distinguished in areas with Hercynian folding, characterized by abnormally high amplitudes in the movement of the Earth’s crust. In the regions of the Caledonian folding, the values of gravity field anomalies of intermediate intensity and increased amplitudes of the latest movements of the Earth’s crust are manifested. Areas with Pre-Paleozoic folding have relative maxima of gravitational anomalies and minimum values of the latest movements of the Earth’s crust. Earthquake sources are concentrated in the consolidated crust at the junction of areas with different ages of basement consolidation, in gradient zones of geothermal, geomagnetic and gravitational anomalies. According to the variations of the intra-crustal transformant, it was found that a wide range of changes in the values of the gravitational field corresponds to areas with minimal temperature values, whereas in areas with increased temperature values, the range of changes in the values of gravity anomalies is reduced. The distribution of the local transformant of the gravitational field indicates the existence of highly variable anomalies, which reflects the high-frequency gravitational effect of near-surface objects of the Earth’s crust. Practical value. The distribution of inhomogeneities in the lithosphere with various density, geomagnetic and geothermal anomalies of geophysical fields, the nature of the seismic regime and the latest movements of the Earth’s crust predetermined the formation of geostructures with different types of mineralization, each of which is recommended to be searched and explored by a specific rational set of geophysical methods.","PeriodicalId":19101,"journal":{"name":"Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46952902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Financial security of macro regions in the period of military aggression","authors":"©. Snishchenko, Lo­ patovska, R. H. Snishchenko, V. I. Hrynchutskyi, Y. Nikolchuk, O. Lopatovska, L. M. Krot","doi":"10.33271/nvngu/2023-4/157","DOIUrl":"https://doi.org/10.33271/nvngu/2023-4/157","url":null,"abstract":"Purpose. Formulation of the main factors affecting the internal migration of the population during the period of military aggression, creation of an economic-mathematical model that will reproduce the number of internally displaced persons (IDPs) for forecasting the financial support of macro-regions. Methodology. The research used general scientific and special research methods: the method of critical analysis, scientific abstraction and generalization of scientific experience of modern theoretical studies, methods of statistical analysis, expert evaluations, system-complex approach. Findings. The main differences in the reasons for the country citizens’ migration are identified in peacetime and in wartime. The factors that increase the behavioral uncertainty of displaced persons are outlined. It is proposed to create economic and mathematical models that will reproduce the dynamics of the number of displaced persons people to forecast the financial provision of macro-regions using the method of correlation-regression analysis. Invariable indicators that have the greatest impact on the number are determined for new arrivals in the specified territories. Originality. The economic and mathematical models presented in the article reproduce the dynamics of the number of internally displaced persons based on statistical data of a representative survey. Unlike the existing ones, they take into account the main factors that affect the internal migration of the population during the period of military aggression. Practical value. The economic-mathematical models presented in the article can be applied in practice in the methods for calculating the financial needs of regions, individual regions and settlements to forecast the number of forced migrants. The method proposed in the article for calculating the forecast quantity of internal migrants allows timely adjustment of the components of economic and mathematical models, which contributes to increasing their reliability.","PeriodicalId":19101,"journal":{"name":"Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45634833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrodynamics of vapor-liquid flows in curvilined channels of separation devices of power plants","authors":"V. Tuz, N. Lebed, N. S. Kulesh","doi":"10.33271/nvngu/2023-4/068","DOIUrl":"https://doi.org/10.33271/nvngu/2023-4/068","url":null,"abstract":"The main factor that affects the efficiency of the separation process is the lack of contact with the surface of the shutter when moving in the flow of small droplets of wet steam. This process depends on the physical and chemical properties of the wet vapor, the dispersion of the droplets, the parameters of the movement of the two-phase medium, adhesion and edge angle, and the geometry of the channel. Purpose. Determination of the limit modes of operation of separation shutter devices depending on the dispersion and quantity of droplet liquid, flow parameters and geometric characteristics of curved channels. Methodology. The methodology is based on the analysis of the physical model of the movement of a two-phase medium under the action of mass and gravitational forces in a curved horizontal channel. Findings. A mathematical model is presented for determining the trajectory of a liquid droplet in a curvilinear corrugation channel of the louvered package of a separator-superheater. The main conditions of film destruction and dynamic droplet break-up are defined. A method for expanding the range of stable operation of separation devices is proposed. Based on the obtained correlations, the design of the blind package is optimized. Originality. Based on the analysis of the physical model of the movement of a two-phase medium in a curved horizontal channel, a mathematical model was developed and the limit of capture of the dispersed phase was determined. Practical value. The presented results allow optimization of separation devices of boiler drums, horizontal steam generators and steam superheater separators of the II circuit of VVER-1000, fuel preparation systems of GTU.","PeriodicalId":19101,"journal":{"name":"Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42093213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}