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Simulation of mine
water flow and heat transport in the conditions of closed mines
D.V. Rudakov1, O.V. Inkin2*
1Dnipro University of Technology, Dnipro,
Ukraine
2Dnipro University of Technology, Branch for
Physics of Mining Processes of the M.S. Poliakov Institute of Geotechnical
Mechanics the National Academy Sciences of Ukraine, Dnipro, Ukraine
*Corresponding author: e-mail: inkin@ua.fm
Physical and technical
problems of mining production, 2022, (24), 82-102.
https://doi.org/10.37101/ftpgp24.01.007
full
text (pdf)
ABSTRACT
The purpose of this study is the
development and validation of a numerical model to simulate mine water flow
and heat transport in disturbed rocks in the zone influenced by an open
geothermal system with the prediction of their energy efficiency indicators
under the existing geological and hydrogeological settings and technogenic
disturbance of mined-out rocks.
Method is based on using a
finite difference model of 3D mine water flow and heat transport through a
heterogeneous porous medium. The computational model was created using the
ModFlow software intended for solving the simultaneous equations of flow
and transport in water-saturated rocks.
Results. For the conditions of
mine No.2 "Novogrodivska" we evaluated the temperature range of
mine water that is proposed to be selected under the condition of
maintaining a safe water level in order to prevent waterlogging and
salinization of the shallow aquifer during 25 years of possible operation;
the estimated range of 18–21°С is generally
consistent with the indicators of the geothermal system at the
"Blagodatna" mine in Western Donbas. It has been shown that the
slight cooling of withdrawn mine water is expected due to the predominance
of heat extraction over geothermal heat inflow from below by the mechanism
of replacing warm mine water by colder infiltration water.
Scientific novelty. The developed
numerical 3D heat transport model reproduces the spatial heterogeneity of
groundwater flow and temperature fields around the geothermal system in a
flooded mine and the evolution of the temperature field at different rates
of the infiltration recharge.
Practical significance. The proposed model of
heat transport in geothermal systems allows to determine and optimize the
operational parameters according to energy efficiency criteria and evaluate
changes in the thermal status of rocks and mine waters under different
conditions of system operation with maintaining a safe mine water level.
Keywords: closed mine, geothermal
systems, mine water, flow, heat transfer, modelling
REFERENCES
1. Kovalko M.P.,
Denysjuk S.P. (2005). Energozberezhennja – priorytetnyj naprjamok
derzhavnoi' polityky Ukrai'ny. K.: UEZ, 506 s.
2. Inkin,
O., Rudakov, D. (2019). An assessment of technical and economic feasibility
to install geothermal well systems across Ukraine. Geotherm Energy 7:17. https://doi.org/10.1186/s40517-019-0134-7
3. Bao, T., Liu, Z.
(2019). Geothermal Energy from Flooded Mines: Modeling of Transient Energy
Recovery with Thermohaline Stratification. Energy
Conversion and Management 199, 111956
https://doi.org/10.1016/j.enconman.2019.111956
4. Walls, D.B., Banks, D., Boyce,
A.J., Burnside, N.M. (2021). A review of the performance of minewater
heating and cooling systems. Energies, 14, 6215. https://doi.org/10.3390/en14196215
5. Rudakov D.V.,
Sadovenko I.O. (2006). Prognozuvannja gidrodynamichnogo rezhymu pry
vidprac'ovu-vanni j zatoplenni shahtnogo polja. Visnyk ZhDTU, (1), 151-157.
6. Malolepszy, Z.
(1998). Modelling of geothermal resources within abandoned coal mines,
Upper Silesia, Poland. Report nr. 8. The
United Nations University, Reykjavik, 217-238.
7. Diersch H.-J. (2014).
FEFLOW. Finite Element Modeling of Flow, Mass and Heat Transport in Porous
and Fractured Media. Springer-Verlag Berlin Heidelberg. 996 p. https://doi.10.1007/978-3-642-38739-5
8. Rudakov, D., Inkin,
O. (2022). A method to evaluate the performance of an open loop geothermal
system for mine water heat recovery. Naukovyi
Visnyk Natsionalnoho Hirnychoho Universytetu, (1), 5-11. https://doi.org/10.33271/nvngu/2022-1/005
9. Langevin Ch. D.,
Hughes J. D., Banta E. R., Niswonger R. G., Panday S.,
Provost A. M. (2017).
Documentation for the MODFLOW 6 Groundwater Flow Model. Chapter 55 of
Section A, Groundwater Book 6, Modeling Techniques. U.S.G.S., https://doi.org/10.3133/tm6A55
10. Krasnopol'skij
N.A. (2006). Zakljuchenie o rezul'tatah raboty «Prognoz izmenenija
jekologo-gidrogeologicheskih uslovij v granicah gornyh otvodov shahty №2 «Novogrodovskaja»,
kotoraja lik-vidiruetsja, likvidirovannoj shahty «Selidovskaja» i shahty
im. D.S. Korotchenko, kotoraja podle-zhit likvidacii, a takzhe smezhnyh s
nimi dejstvujushhih shaht: otchet o NIR. Artemovsk : Artemovs-kaja
gidrogeologicheskaja partija, 130 s.
11. Sadovenko I.A.,
Rudakov D.V. (2010). Dinamika fil'tracionnogo massoperenosa pri vedenii i
svertyvanii gornyh rabot. D.: Nac. gornyj un-t, 216 s.
12. Ljal'ko V.I. (1974).
Metody rascheta teplo- i massoperenosa v zemnoj kore. Algoritmy i programmy.
K.: Naukova dumka, 131 s.
13. Sadovenko I.O.,
Inkin O.V. (2016). Teoretychni ta geotehnologichni osnovy rozrobky
pryrodno-tehnogennyh resursiv vugil'nyh rodovyshh. Mining of Mineral
Deposits, (Vol. 10), Issue 4, 1-10.
14. Kostjuchenko M.M.,
Shabatyn V.S. (2005). Gidrogeologija ta inzhenerna geologija. K.:
Vydavnycho-poligrafichnyj centr «Kyi'vs'kyj universytet», 144 s.
15. Pivnjak G.G.,
Samusja V.I., Oksen' Ju.I. (2017). Teorija i praktika teplonasosnoj
utilizacii teploty shahtnoj vody.
Ugol' Ukrainy, 6-10.
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