Pavlo Saik

• Professor (Associate) at Dnipro University of Technology

Purpose. To develop an innovative approach for carbon dioxide utilization during the borehole underground gasification of coal at the SE “Lvivvuhillia”. Methods. The determination of stratification cavity parameters in the rock mass during underground coal gasification was based on analytical studies. These studies employed the method of stress-str...

Purpose. The research purpose is to determine the efficiency parameter of the coal gasification process based on the analysis of the composition of combustible gases (Н2, СН4, СО) and the producer gas calorific value, depending on the methods of supplying the blast mixtures to the gasifier oxidative zone. Methodology. A laboratory setup is used to...

Purpose. Explore the impact of raw material processing stages on qualitative and quantitative production indicators and devise technological schemes for processing mineral raw materials to produce crushed stone products. Methodology. The study employs theoretical analysis, information systematization, and generalization of key physical and mechanic...

Purpose. Substantiation of the stress-strain parameters of a rock mass state to identify potential mine methane accumulation in the roof rocks of the extraction pillar. Methodology. Characterization of stratification cavity in rock mass for mine methane extraction relied upon analytical studies. The research is based on a method by Professor O.V. S...

Purpose. Development and generalisation of a set of key elements for a non-waste technology concept of mining high-quality coal from thin coal seams, based on the processes of backfilling the mined-out space with waste rocks from stope and tunnelling operations. Methods. A comprehensive methodical approach, containing the systematisation and genera...

Purpose. An innovative approach formulation to the rational development of the potential of coal mines to expand the economic activity of mining enterprises based on the implementation of underground heat generators during coal gasification. Methods. Based on the conducted analytical and laboratory research, to study the possibility of introducing...

The purpose of this paper is to propose a new methodological approach to complex assessment of coal-mining enterprises basing on the evaluation of technological schemes from the viewpoint of their susceptibility to innovations. To solve the specified problems, a complex method has been used. The method involves geometrical interpretation of a task...

This paper studies the relevant issues of innovative projects implementation, in particular, during the prospective development of coal reserves by geotechnology of underground gasification. To solve the objectives set in the work, an integrated approach is applied, which includes: critical analysis, generalization, systematization and synthesis to...

Underground coal gasification is an alternative method for mining coal from thin and ultra-thin seams, which enables conversion of solid fossil fuels into combustible gases at the site of coal occurrence. At the same time, in the case when the coal seam thickness is critically small for the effective course of thermochemical reactions, it is necess...

The paper represents the studies of the process of carbonaceous raw material gasification. The initial material is represented by bituminous coal of grade H with the carbon (C) content of 79.2-85.3 %. Experimental studies have been used to substantiate the parameters of combustible generator gases (СО, Н2, СН4) output depending on the temperature o...

This paper represents the results of experimental studies of physical modeling of the underground coal gasification process in terms of implementation of design and technological solutions aimed at intensification of a gasification process of thin coal seams. A series of experimental studies were performed in terms of a stand unit with the provided...

The objective is to analyze the dynamics of the underground water of a mine field based on the study of the geofiltration process of the rock mass disturbed by mining to achieve safe extraction operations as well as subsurface territories at the stage of the mining enterprise closure. Numerical modeling, based on a finite difference method under th...

Protective efficiency of filtering dust respirators depends on the properties of filter materials from which filters are made and the structure of a half mask frame, which influences how tightly the respirator fits the face. The conducted studies on the “Lepestok 40” dust respirator revealed a large air leakage through the gaps occurring along the...

In this paper, a solution to the problem of the change in the pressure drop in a respirator filter during cyclic air motion is suggested since the current theory of filtering is based on steady-flow processes. The theoretical dependence of the pressure drop in the respirator filter on air flow rate is determined, which is represented by the harmoni...

Mining of the off-balanced and balanced reserves of mines, being under closure or completing their operation, required the implementation of mobile, complex, and environmentally friendly development technologies based on the processes of well underground coal gasification (WUCG) that unites mining of coal and its energy-chemical use. Environmental...

Ukraine is an energy-dependent country, with less that 50% of its energy consumption fulfilled by its own resources. Natural gas is of paramount importance, especially for industry and society. Therefore, there is an urgent need to search for alternative and potential energy sources, such as gas hydrate deposits in the Black Sea, which can reduce t...

The present paper considers aspects of underground iron ore mining in Ukraine, in particular the level of mine production and reserves of basic ore fields. It analyzes and generalizes the practice of using cemented rockfill under difficult mining and hydrogeological conditions of the Pivdenno-Bilozerske high-grade iron ore field. The Belozersky iro...

This paper studies the key problems of mining enterprises activity, which is mainly based on monofunctionality. A synergistic approach is described, which is a constituent basis for perspective performance of coal mines. The possibilities for profile reorientation of the coal mine operation as an enterprise for obtaining a natural gas substitute ar...

This paper deals with the problems emerging during the research into gas hydrate production processes, in particular, their dissociation in natural conditions. The advantages and disadvantages of known research methods have been analysed based on domestic and world research-and-practice experience of the conditions for hydrate formation and dissoci...

Results of evaluating the suitability of certain sections of Western Donbas coal seams, based predominately on properties of coal material, for their further experimental development by means of underground gasification method are represented. Criteria to evaluate both expediency of underground gasification and specific conditions of that process a...

In this article, variants of technological designing of new mining enterprise levels for obtaining the skills of engineering task execution are considered. The complex approach for the justification of a mine’s parameters is examined. The combinations of quantitative and qualitative parameters for designing new coal-face and preparation works, tran...

Topical issues of the possibilities for changes in the coal extraction technology in terms of Stepova mine of Lvivvuhillia SE have been highlighted. Analysis of the current state of mining operations has been carried out. Design solutions as for introduction of the coal gasification technology in the life cycle of the mining enterprise has been pro...

Purpose. To substantiate changes in stress-strain state of rock mass in the process of long-pillar mining with the help of double-unit longwalls while evaluating stress of a mine field in terms of Lvivvuhillia SE mine. Methods. Analysis of the plans of mine workings has become a basis for the evaluation of physical and geometrical pa-rameters of a...

This paper studies the problems related to the research on the temperature conditions during the coal seam gasification. In particular, while maintaining the identity of the “model – nature” system. A review of the specific application of thermal imaging equipment and thermoelectric transducers (thermocouples) is given. Approaches to the research i...

Розглянуто проблеми енергозабезпечення гірничопромислових регіонів України, що обумовлені суттєвою імпортозалежністю від природного газу, відсутністю ефективних технологій комплексного освоєння енергетичних ресурсів газовугільних родовищ і погіршеними соціально-економічним та екологічним станами гірничопромислових регіонів. Запропоновано перспектив...

This article is focused on solving the problem of power supply for the mining and industrial regions of Ukraine. This problem is caused by a significant import dependence on natural gas, the lack of efficient technologies in the integrated development of the energy resources of gas-coal deposits and the deterioration of social and economic, as well...

The authors of the paper consider the concept of further prospective development of mining enterprises. The basis of this concept are scientific results obtained during the study of physical and chemical processes of solids conversion into the gaseous state: coal → gaseous fuels. It was established that the main base of development of mining region...

Purpose. Analysis of the man-made mineral formations of ore mining and smelting, fuel and energy complexes development accumulation, location and prospects amount in the Dnipropetrovsk region. Methods. Comprehensive approach, including analysis of state statistics, waste handling sites (WHSs), regional environmental report, environmental passport o...

Мета. На основі проведених аналітичних та експериментальних досліджень встановити параметри матеріально-теплового та енергетичних балансів газифікації вугілля. Методика досліджень. Для досягнення поставленої мети в роботі використано комплексний підхід, що включає проведення аналітичних та експериментальних досліджень. Аналітичні дослідження провод...

The development of iron-ore deposits is accompanied by the excavation formation of considerable dimensions in the underground space and to ensure high technical and economic indicators of extraction, especially when developing high-grade iron ore, it is necessary to take into account the nature of the geological structure of the massif on the indic...

The influence of the humanitarian component (sacred, religious, social factors) on the origin and initial development of mining activity, metallurgy origin, the first natural and technical knowledge accumulation and application forms are considered. The hypothesis of the metallurgy occurrence in the stable communities of primitive miners is conside...

The relevant issues have been studied of ensuring the stability of producing wells in the place of their curving when uncovering the mining extracted area for the underground gas generator operation. It is emphasized that the design planning of efficient operation of underground gas generators in downhole gasification technology is impossible witho...

In this article, the mass and heat balance calculations of underground coal gasification process for thin coal seams in faulting zones of Lvivskyi coal basin are defined. The purpose of the research is to establish regularities of heat and mass balance changes in faulting zones influence due to usage air and oxygen-enriched blast. A comprehensive m...

Results of computer modeling of stress-deformed state of rock massif with the use of software FLAC 5.00 in zones of geological fault influence with amplitude that does not exceed 3 m are presented in the article. According to the results of the modeling, the dependences of vertical stress change in handing wall and foot wall of geological fault wit...

Purpose. Research on stress-deformed state of rock massive around underground gasifier taking into account the change in the continuity of the roof rocks and the thermodynamic stresses in them. Methodology. Conducting analytical studies was based on the accepted physical and mathematical models, for the development of which the rock massif movement...

In this article, the mass and heat balance calculations of underground coal gasification process for thin coal seams in faulting zones of Lvivskyi coal basin (Ukraine) are defined. The purpose of the research is to establish regularities of heat and mass balance changes in faulting zones influence due to usage air and oxygen-enriched blast. A compr...

Topical issues concerning the low efficiency of underground coal mining from thin and very thin seams as well as the problems of reserves left in mine fields by the closed-down enterprises resulting in substantial coal reserve losses have been highlighted. Alternative use of the unextracted energy resources is their physical and chemical transforma...

Coal is the main energy resource in Ukraine. However geotechnological aspects of coal seams development and Ukrainian crisis have a negative influence on the mining industry. This article analyzes the experience in the development of very low and low-coal seams with 0.7–1.0 m thickness, as well as advanced technological solutions that allowed priva...

Purpose. Development of innovative approaches in technological and technical solutions improvement for coal seam gasification. Methods. Carrying-out of native and world experience in the coal reserves development by underground gasification technology analysis, analytical studies on the heat and mass balance gasification process parameters determi...

In this paper, the geological faults in the zone of stable geodynamic and tectonic activity are studied. The purpose of the analytical research is to establish regularities of rock pressure in the hanging and foot walls of the geological fault and its influence on the state-deformed state of the rock massif. Comprehensive methodology that included...

Topical issues concerning the possibilities of effective energy generation on the basis of Ukrainian mining enterprises have been highlighted. Attention is drawn to one of the most challenging tendencies of nontraditional energy sources development in the process of wind-driven powerplant use. The plants consume energy of technogenic air flows. Ope...

Purpose. Determination of economic efficiency of gas hydrates deposits development of heterogeneous structure based on established technological parameters of their decomposition for increase the investment attractiveness of additional gas resources extraction from the Black Sea. Methods. To achieve this purpose, analytical calculations of economi...

The aim of this paper is to study the methods and develop technological scheme for thermal energy removal from coal mine rock waste dumps. The prospects of renewable energy sources development in Ukraine are analyzed. A number of available ways for using the sources of waste heat of mining enterprises, namely: outlet ventilation flow, mine water an...

На основі детального аналізу наявного досвіду встановлення рамного кріплення підготовчих виробок на шахтах України та застосування перевірених методик визначення навантажень на окремі його елементи запропоновано концепцію збільшення кроку інсталяції рамноаркового кріплення на шахтах Польщі. Економічну оцінку запропонованого технологічного удосконал...

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 proj...

На основі усестороннього аналізу наявного досвіду підземної газифікації та існуючих технологічних схем свердловинної підземної газифікації вугілля запропоновано концепцію розвитку технології СПГВ і створення на її базі енергохімічного комплексного підприємства з утилізації сировини, рекуперації і видобутку енергії та хімічних продуктів у замкнутому...

Purpose. Setting up and implementation of complex, combined and non-waste power-chemical plant based on underground coal gasification with regard to analysis of its technical and economic efficiency. Methods. Research into the reliability of the gasifier plant components was performed by determining the sequence of processes and operations during u...

The results of simulation systems of the rock-mass using the new mathematical approaches and modern information software are introduced. The contacts of rock mass strata are presented as the curves in the simulation model. In such way, it is forming the specific zones with different strengthening characteristics. Authors propose to define the defor...

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 we...

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 subsi...

Coal is the main fossil fuels used in power generation. According to the World Energy Resources 2013 on an average 60% of global substandard coal reserves located in difficult mine and geological conditions, including the geological fracturing zones. Development of such coal would allow to increase the time of its consumption due to additional prod...

In the article results of analytical, laboratory and bench test researches presented. The present paper deals with the creation of generator gas from coal seams in-situ. It is proposed to use received results to intensify underground coal gasification process. The results of laboratory and bench test experimental researches are presented in the for...

In the article, the development concept of technology borehole underground coal gasification based on the modern technological and technical accomplishments of scientists are presented. During last 25 years research of the Underground Mining Department improve the technology of coal seam gasification. The results of such improvement are a list of p...

The dependences of fault plane amplitude in geological fault on the distance at which the gasifier reach the regime of stabilization on the total output of combustible gases and their heating value are received. Change the dependence of the coefficient of gasification enhancement, depending on the thermochemical rate processes in reaction channel o...

The possibility to ensure uniformity advance of combustible face in underground gasifier is analyzed. The results of laboratory experimental studies during coal gasification with variable coal seams thickness are shown. The results of experimental investigations stand out enough for practical applications of precision can be used to coal seam gasif...

In the article results of analytical, laboratory and bench test researches presented. The present paper deals with the creation of generator gas from coal seams in-situ. It is proposed to use received results to intensify underground coal gasification process. The results of laboratory and bench test experimental researches are presented in the for...

In the article the development concept of technology borehole underground coal gasification based on the modern technological and technical accomplishments of scientists are presented. During last 25 years researches of the Underground Mining Department improve the technology of coal seam gasification. The results of such improvement are a list of...

On results of analytical investigations the vertical component of the stress in the hanging wall and footwall sides geological fault are obtained. By interpolation 3-D grid-visualization of vertical stresses in space is achieved. On the basis of conducted research the conclusions are formulated for the proposed method utilized.

The results of technological processes control research at coal seam gasification are resulted. It was received on the base of approbation the underground gasification technology on experimental in-situ gasifier which allows extending an application of this technology and conducting more high-quality process control of gasification due to the water...

Purpose. Substantiation of the rational geometrical parameters of spatial location of combustion faces in contiguous low-coal seams based on the established lows of middlemen subsidence during borehole underground coal gasification in Chervonograd mining region. Methodology. The bench test allowed us to determine the common factors of middlemen sub...

The results of investigation the cavity forming at underground brown coal gasification are presented. On the basis of the conducted researche the method of underground gasifier preparation is developed taking into account the parameters of goaf forming and cavities in rocks of roof.

In this article the characteristics of the criteria of borehole underground coal gasification for thin coal seams are defined. The thermal and material balance calculations for coal seam gasification processes are also explained. The construction, method of in situ gasifier preparation, and the sequence of coal seam gasification for area No 1 (loca...

The correlation between aerodynamic air and gas activity, gas humidity, thermal mode and calorific value of receive generator gas during borehole underground coal gasification are set.

Justification the length of gasification channel in underground gas generator by oxidation zone calculation and by geomechanics factor are described. The new methods of gasification channel calculation on the base of underground coal combustion process is offered. Dependence the power of gas generator at thin coal seam gasification due to the lengt...

Purpose. To determine investment attractiveness of main economic indicators of the project of mining equipment implementation for coal reserves exploration in the mine of State Enterprise 'Lvivvugillia'. Methodology. We have used the methodology of investment attractiveness estimation suggested by UNIDO (United Nations Industrial Development Organi...

Implementations of test research enable considerably to decrease expenses at the estimation of the efficiency of underground coal gasification for concrete mining and geological conditions. The new method of test research is offered with the simulation of underground conditions of the real mine. Dependencies of the material and thermal balance are...

he results of borehole underground coal gasification researches on the stand seating with account technological and geological conditions and technological parameters at coal seam gasification process are examined. During an experiment the products of coal seam gasification, high-quality composition of generator gas and chemical products at differe...

The results of borehole underground coal gasification researchers on the stand seating with account technological and geological conditions and technological parameters at coal seam gasification process are examined. During an experiment, the products of coal seam gasification, high-quality composition of generator gas and chemical products at diff...