Actualization of prospects of thermal usage of groundwater of mines during liquidation

Purpose. Determination of the influence of mining and geological conditions of drilling hydrogeological wells with backwash on the technological parameters of the airlift method of cleaning it from drilled rock and the properties of the ascending flow of aerated washing liquids. Methodology. The tasks were solved by a complex research method, including analysis and generalization of literary and patent sources, analytical, experimental studies, using computer and mathematical modeling methods. Findings. An algorithm for the functioning of the airlift circulation method during rotary drilling with backwash has been developed. The algorithm takes into account: hydrostatic and hydrodynamic pressures, and the effect on them of the rate of drilling of the well; the effect of the sludge content in the upstream. The effective values of the airflow rate, the density of the water-air mixture and the velocity of its upward flow are established. A method for estimating the effective values of technological parameters and their changes in the upward flow of the mixture is proposed. A model has been developed that allows analyzing the dependences of the air flow rate, the density of the mixture and the rate of its ascent on the parameters of the well being drilled. The model is applied to typical drilling conditions of a large-diameter water intake well at the Samskoye groundwater deposit on the Mangystau peninsula. Originality. A mathematical algorithm has been developed for the functioning of the airlift backwash method when drilling large-diameter water intake wells. The method is based on the analysis of the pressure balance in the descending and ascending flows of the washing agent. For the case of backwash, a formula for estimating the content of sludge in it was obtained. A method has been developed for determining the average effective density of the mixture in terms of the height of the well, as well as the air content in it. Based on the average effective values, a method is proposed for estimating changes in the density of the mixture, its flow rate and velocity along the upward flow. Practical value. The proposed algorithm is the basis of a computer model that allows you to determine the dependences of the values of the density of the mixture, the content of air and sludge in it and the rate of ascent, from the depth of the well, the depth of the mixer descent, the speed of deepening, the specified velocity of the upward fluid flow, as well as the diameters of the well and drill pipes. Specific modeling results have been obtained in relation to the Samskoye groundwater deposit of the Mangystau peninsula.

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“…The values on which the dependence is established are not taken from Tables 1 and 2, but are specified separately, in accordance with the (1).…”

Section: Fig 1 Block Diagram Of a Computer Modelmentioning

confidence: 99%

“…Literature review. The problem of the development and protection of the underground waters of the planet Earth is in the focus of attention of special UN organizations and many countries [1,2].…”

Section: Introductionmentioning

confidence: 99%

Modeling of drilling water supply wells with airlift reverse flush agent circulation

Biletskiy¹,

Ratov²,

Sudakov³

et al. 2023

Nauk. visn. nat. hirn. univ.

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“…Great amount of fundamental studies in the field of carbonaceous products within their places of occurrence is aimed at substantiating possible technological and technical solutions to implement that process [19]. In this context, they are based on the research of stress and strain state of a rock mass by both analytical and experimental operations carried out under the real mine conditions [20][21][22][23][24], geofiltration processes [25,26], volumes and qualitative characteristics of gas output [27,28], distribution of temperature field around a combustion face [29,30] and its advance rate [32,31] as well as by products production via pyrolysis process [33][34][35]. At the same time, it should be noted that thermodynamic basis of the CRMG processes have been studied rather thoroughly [36][37][38] while chemical kinetics has been not analyzed enough especially in terms of underground gasification of carbonaceous raw material along the gasification column.…”

Section: Analysis Of Recent Sstudies and Publicationsmentioning

confidence: 99%

Chemistry of the Gasification of Carbonaceous Raw Material

Saik

Dychkovskyi

Lozynskyi

et al. 2021

MSF

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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 of a reduction zone of the reaction channel and gas flow velocity along its length. It has been identified that the volume of the raw material input to be used for gasification process changes in direct proportion depending on the amount of burnt-out carbon and blow velocity. The gasification is intensified in terms of equal concentration of oxygen and carbon in the reaction channel of an underground gas generator. The gasification rate is stipulated by the intensity of chemical reactions, which depend immediately on the modes of blow mixture supply. Moreover, they depend directly on the intensity of oxygen supply to the coal mass and removal of the gasification products.

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“…The performance efficiency can be roughly assessed by the Coefficient of Performance (COP ) that depends on the tem peratures of the fluid in exchangers and in the heating circuit of buildings; in practice, COP varies from 2.5 to 6 [13,14]. Al though COP refers mostly to heat pump operation; it allows also comparing the performance of different geothermal sys tems operated under the same temperature in heating circuits.…”

Section: Introduction the Prospects And Feasibility Of Installingmentioning

confidence: 99%

An approach for ranking abandoned mines by the efficient use of their geothermal potential

Rudakov¹,

Inkin²

2023

Nauk. visn. nat. hirn. univ.

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Purpose. To develop an approach for ranking abandoned mines in terms of the efficiency of mine water heat recovery by geothermal systems through applying the set of basic criteria; they allow considering geological and mining conditions in first approximation and preliminary assessing the performance of the systems located on them. Methodology. The proposed approach includes the ranking of mines by five basic indicators usually available or easily calculated such as the conversion factor of heat pumps COP, energy balance, thermal capacity, profit of operation, and reduction of CO2 emissions. The energy balance introduced by the authors earlier is defined as the relation of thermal energy produced to the thermal equivalent of electricity required for operation. These indicators are integrated in the complex rank to compare the expected performance and generate the priority lists for industrial installations in mines. Findings. We ranked 27 abandoned coal mines in Donbas with available data by five indicators separately and the complex parameter defined through averaging their contributions. The top promising sites for open non-circulation, circulation, and closed loop systems in terms of efficient heat recovery were identified. These sites refer to mostly deep mines in the central part of Donbas with the enhanced geothermal gradient over 0.03 °C/m. Originality. Firstly, an approach to evaluate the geothermal potential and ranking the mines regarding the efficiency of thermal energy use based on existing and introduced performance indicators has been substantiated and validated for a group of abandoned mines. The developed technique allows-analyz and preliminary quantify the feasibility of geothermal installations of different design. Practical value. The proposed approach for ranking post-mining sites enables generating the priority lists with regard to recovery of low-grade energy from mine water, thus, identifying the geothermal potential and most promising sites for further detailed feasibility studies and operation of geothermal systems of various types.

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Actualization of prospects of thermal usage of groundwater of mines during liquidation

Cited by 8 publications

References 8 publications

Modeling of drilling water supply wells with airlift reverse flush agent circulation

Modeling of drilling water supply wells with airlift reverse flush agent circulation

Chemistry of the Gasification of Carbonaceous Raw Material

An approach for ranking abandoned mines by the efficient use of their geothermal potential

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