Theoretical and geotechnological fundamentals for the development of natural and man-made resources of coal deposits

Sadovenko, Ivan; Inkin, Oleksandr; Zagrytsenko, A

doi:10.15407/mining10.04.001

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…The majority of the studies concern the analysis of the filtration parameters of the rock mass at the stage of active displacements and the formation of zones of water conducted fissures [34][35][36]. Moreover, they differ by orders of magnitude in terms of various data [37].…”

Section: Introductionmentioning

confidence: 99%

Forecasting Underground Water Dynamics within the Technogenic Environment of a Mine Field. Case Study

et al. 2021

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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 the conditions of multifactority and definite uncertainty of processes of transformation of technogenic environment of a mine field, helps solve a problem concerning underground water dynamics forecasting. A hydrodynamic model of the M.I. Stashkov mine was developed while solving option series of epignosis problems in terms of the chronology of mine field stoping. The abovementioned made it possible to identify regularities of the history of filtration, the capacity parameters of rock mass and the expansion of areas of heightened hydraulic conductivity as well as to evaluate qualitatively the water balance components of a carbonic watered formation and an overlying one. The stage of mining closure helped obtain the forecasting hydrodynamic solutions. The efficiency of measures, concerning reduction of water ingress into mine workings and the mitigation of surface ecological effects of mine flooding was evaluated quantitatively. It was determined that implementation of the water control procedures makes it possible to perform a 10–38% decrease in water ingress. In this context, they may be applied both independently and simultaneously. In terms of mine closure and flooding, a period of complete underground water recovery takes three years; in the process, surface zones of potential waterlogging and swamping are developed within the floodplain of Samara River, located at the territory of Western Donbas (Ukraine). The scientific novelty is to define regularities of hydraulic conductivity transformation of the rock mass of a mine field starting from the mine working roof fall, up to its compaction during the mine operation period. To do that, nonstationary identification problems were solved, using numerical modeling. The abovementioned makes it possible to improve the reliability of hydrodynamic prognoses and develop technological schemes to control water at the state of the mine closure.

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Section: Introductionmentioning

confidence: 99%

Forecasting Underground Water Dynamics within the Technogenic Environment of a Mine Field. Case Study

et al. 2021

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“…The experience of geothermal system operation at closed mines revealed a few challenges [7,8]. The first one is to en sure environmentally safe and sustainable longterm heat re covery with maintaining a safe mine water level to avoid trap ping mine water to the overlying aquifers used for water supply; secondly, it is necessary to maintain the system efficiency that reduces in time due to discharge of cooled water back to the mine after thermal use.…”

Section: Introductionmentioning

confidence: 99%

Validation of the operation efficiency criteria for geothermal probes in flooded mine workings

Rudakov¹,

Inkin²

2020

Nauk. visn. nat. hirn. univ.

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Purpose. To develop and test the energy and cost criteria for evaluating the operation efficiency of a closed geothermal system using coaxial or U-shaped probes that can be installed in flooded workings of mines. Methodology. To justify the energy and cost criteria, we applied thermodynamic, hydraulic and cost-efficiency relationships, conducted the engineering analysis of closed geothermal systems, studied hydrogeological settings and geothermal conditions of the mines of the Selidovo group in Donbas. The developed criteria were examined within the ranges of key parameters such as the flow rate of the heat transfer fluid and the probe submerged length. Findings. We quantified the influence of the probe submerged length and the heat transfer fluid flow rate on the energy balance and the net present value NPV and identified the parameter combinations that allow achieving efficient heat recovery in terms of energy balance and cost-efficiency. The produced/spent energy ratio may reach 1.52.2 and the NPV a few dozen thousand when increasing the submerged depth to 500 m at the flow rate of 20m3/d. A higher flow rate may lead to a negative energy balance but the NPV remains positive within some ranges of the probe submerged length, thus, indicating the system profitability. The payback period can be shortened to a few years. Originality. The proposed energy criterion balances the thermal energy produced and the thermal equivalent of electric energy generated using fossil fuel and spent on system operation. This ratio as distinct from the usually applied COP parameter allows comparing the energies of the same nature and drawing more adequate conclusions on environmental acceptability of a geothermal system. Practical value. The proposed criteria can be used for prioritization of geothermal system installation and the operation efficiency evaluation among the number of potential sites in post mining areas.

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“…An important aspect of ensuring technological process of gasification is its adaptation to the specific geological conditions of the coal seam occurrence [15]. Therefore, the investigation of the potential areas for the UCG is essential in order to establish the parameters of the heat and mass balance and environmental application of this technology.…”

Section: Introductionmentioning

confidence: 99%

Coal Seam Gasification in Faulting Zones (Heat and Mass Balance Study)

Lozynskyi

Dichkovskiy

Saik

et al. 2018

SSP

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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 comprehensive methodology that included analytical calculations is implemented in the work. The output parameters of coal gasification products for the Lvivvyhillia coal mines are detailed. The heat balance is performed on the basis of the mass balance of underground coal gasification analytical results and is described in detail. Interpretations based on the conducted research and investigation are also presented. Conclusions regarding the implementation of the offered method are made on the basis of undertaken investigations. According to conducted research the technology of underground coal gasification can be carry out in the faulting zone of stable geodynamic and tectonic activity. The obtained results with sufficient accuracy in practical application will allow consume coal reserves in the faulting zones using environmentally friendly conversion technology to obtain power and chemical generator gas, chemicals and heat.

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Theoretical and geotechnological fundamentals for the development of natural and man-made resources of coal deposits

Cited by 9 publications

References 3 publications

Forecasting Underground Water Dynamics within the Technogenic Environment of a Mine Field. Case Study

Forecasting Underground Water Dynamics within the Technogenic Environment of a Mine Field. Case Study

Validation of the operation efficiency criteria for geothermal probes in flooded mine workings

Coal Seam Gasification in Faulting Zones (Heat and Mass Balance Study)

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