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Vasyl MYKHAILIUK, Oleh FAFALEY, Ruslan DEYNEGA, Yurii MOSORA

Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine

 

Simulation features of the impeller in a centrifugal pump

p. 1-7

To ensure the operability of machinery and equipment for the oil and gas industry, it is important to study their operation with subsequent improvement. This scientific work is devoted to highlighting the operation simulation of the impeller in a submersible centrifugal pump, because the pump itself is the main equipment in oil production. The main parts of a submersible centrifugal pump are its stages, consisting of an impeller and a guide vane. When the impeller rotates, a force interaction of the flow with the impeller blades occurs, while a pressure difference in the fluid flow on both sides of each blade arises. The pressure forces of the blades on the flow create a forced rotational and translational motion of the fluid, increasing its mechanical energy. It should be noted that the movement of fluid in pump sections is a rather complex process that is difficult to accurately describe analytically. However, today there are various computer programs (SOLIDWORKS FlowSimulation, ANSYS CFD, etc.) based on the finite volume method (FVM). To study the operation of a submersible centrifugal pump impeller, there has been built its three-dimensional model. As a result of calculations, the distribution of pressure and velocity in the cross section of the impeller was obtained.

Keywords: impeller, pressure, simulation, speed, submersible centrifugal pump

 

Paweł FRIEBE, Rafał BARON,
KOMAG Institute of Mining Technology, Poland

Vasyl SHEKETA
Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine

 

Concept of a CDR resonance screen

p. 8-18

Review of existing solutions of resonance screens, including their technical parameters are presented. The following resonance screens are discussed: GHH type, multi-mass ZDR type, GRO-1 type, EGK-2 type, CDR-8 type, etc. On this basis, the strengths and weaknesses of the discussed solutions of resonance screens are identified. Conclusions resulting from the analyzes of the applied solutions were used in KOMAG to develop the concept of the CDR-85K resonance screen. The assumptions made during development of the concept of a new resonance screen solution are presented, and then its structure and principle of operation are discussed. A general drawing of the designed screen with selected parts is provided. The attention was paid to the innovative solutions used in its design.

Keywords: CDR resonance screen, minerals classification

 

Paweł KAMIŃSKI, Zbigniew NIEDBALSKI, Piotr MAŁKOWSKI
Department of Mining Engineering, Faculty of Civil Engineering and Resource Management,
AGH University of Science and Technology, Poland

Darian BOŽIČ 

Coal Mine Velenje, d.o.o., Slovenia

 

Application of composite materials in underground mining
industry – fore-shaft closing platform

p. 32-42

According to Polish law regulations, fore-shaft in underground mines in process of its liquidation must be either filled with bulk material or closed with double-deck platform on its top. As liquidation by closing is cheaper and easier than filling, steel closing platforms are typically used for this purpose. However, steel price fluctuations due to COVID‑19 pandemic together with rapid development of composite materials, make application of composite structure a tempting direction. The article presents a design of composite double-deck closing platform for fore-shaft liquidation in one of the collieries located in the eastern area of Silesian Coal Basin. Presented solution was thoroughly calculated and tested and then assembled in the mine. The aim of the research was to prove applicability of composite structures in underground mines with maintaining proper level of safety.

Keywords: composite materials, fore-shaft liquidation, shaft platform, mine liquidation

 

Andrzej WĘGRZYN

Industrial Development Agency JSC, Poland

Agnieszka SPIRYDOWICZ

Zklaster, Poland

Wes GREBSKI

The Pennsylvania State Universit, USA

 

Dilemmas of the energy transformation in Poland 2021/2022

p. 32-42

The subject of the article is an analysis of the energy transformation in Poland against the background of the changes taking place in the environment. Authors study key issues related to the energy transformation to analyze the dynamics of the Polish energy transformation as well as the possible directions. In the end they discuss the three possible scenarios for Poland which could transform the country’s energy system from coal to zero emission. The discussion is up-to-date according to the European and world directions of industrial transition into green energy and Poland has got huge challenges ahead while the time to take steps is passing.  

Keywords: just transition, energy system, renewables, energy transformation

 

Artur DYCZKO

Mineral and Energy Economy Research Institute of the Polish Academy of Sciences, Poland

Małgorzata MALEC

KOMAG Institute of Mining Technology, Poland

Mahmood AHMAD 

Department of Civil Engineering, Faculty of Engineering, International Islamic University Malaysia, Malaysia

 

SOK Research Project – Bw-1n gallerydrilling test using Bolter Minerand exclusive bolting in Polish conditions

p. 43-53

The article presents the SOK Research Project idea, course and final results. The project was oriented onto an implementation of exclusive bolting in one of the Polish underground coal mines, realized with use of a multifunction Bolter Miner. Until starting that project the Jastrzębska Spółka Węglowa S.A. (Jastrzębska Coal Company J.S.C.) has been using different types of other supports (steel arches as gallery / roadway supports). Previous trials of implementing exclusive bolting in the Polish coal mines in the nineties of the XX century were not successful due to different reasons. In the case of the SOK Research Project, after having conducted detailed geological and mining analyses, a part of the Seam 401 in the Budryk Mine was chosen for tests of exclusive bolting with use of JOY 12CM30 Bolter Miner in the gallery drilling operations. Due to previous experience, gained in the process of exclusive bolting in the Upper Silesian Coal Basin conditions, special attention was paid to bolting designing as well as an installation and monitoring. As the SOK Research Project was the first trial in Poland of gallery drilling using exclusive bolting and Bolter Miner, so it was difficult to predict exact costs and final efficiency results. For all the project participants, i.e. the mining crew, engineers, managers and researchers it was an on-job training in the scope of new technology. The SOK Research Project enabled to gain a lot of new experience and knowledge, leading to guidelines and conclusions which can be useful in the following exclusive bolting implementations with Bolter Miner technology.

Keywords: bolting support, Bolter Miner, test gallery, research project, mining-and-geological conditions, monitoring, advance

 

Krzysztof NIEŚPIAŁOWSKI

KOMAG Institute of Mining Technology,Poland

Lubomyr CHELYADY, Taras ROMANYSHYN

Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine

 

Cooling system for high-power drives in belt conveyors

p. 54-63

In mining plants (underground and on the surface), high-power machines are used. Electric motors and the gears driven by them have a specific cooling system as a flow system with an internal heat exchanger. The role of the heat exchanger is to collect the thermal energy generated during the unit operation. The refrigerant with the received thermal energy must be led away from the motor and gear unit, where it will be cooled. In the drives used in underground hard coal mines, water is the cooling medium, supplied through a fire-fighting pipeline. The water used for cooling is often discharged directly to the floor or to sewers, and further it is transported to the surface. The article presents a solution that uses tanks for cooling liquid with highly efficient air-water coolers in surface and underground applications.

Keywords: high-power drives, mining industry, cooling, efficiency, automation of work