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System of current collectors inertization for safety use in explosive atmosphere-testing and results

Drwięga Andrzej, Lesiak Krzysztof, Clausen Elisabeth, Getz Maximilian

Mining Machines

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2023

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vol. 41, iss. 4

274--284

EN

R&D work regarding the innovative mine transportation system, planned to be powered by the three-phase busbar, developed within theRFCS project "Increase of mines efficiency and health protection through the innovative transport system based on BUSDUCT" is discussed. Assumptions regarding the construction of the locomotive and the production of nitrogen from the air for inerting purposes are discussed in the first part, whereas in the second part adapting thecurrent collector’s brushes to nitrogen injection, the relevant CFD calculations, the stand for testing the inertization, are presented. Many interesting experiments on the effectiveness of inertization using explosive mixtures of hydrogen and air are illustrated, described and discussed.

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Effectiveness of half masks for respiratory health protection in coal mining

Drwięga Andrzej, Williamson Ben, Foster Patrick, Lesiak Krzysztof

Mining Machines

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2021

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no. 3

2--17

EN

An improved procedure is presented for testing the level of respiratory health protection and comfort of half masks currently used in coal mining and similar industries. This will allow companies to make the best choice of such equipment for their workers. Half masks used by one Slovenian (PV) and two Polish (JSW and PPG) coal mining companies were tested in terms of filtering efficiency, especially for PM2.5, perceived effectiveness, comfort and ease of use. Filtering efficiency was determined by analysing filters from masks used in underground operations for the levels and sizes of trapped coal dust particles and by carrying out experiments employing a specially developed laboratory test stand. The latter incorporated a replica human head and a climatic chamber to simulate the humidity of exhaled air during mining activities. To determine the comfort and utility of the half masks, selected miners were asked to fill in questionnaires. The main results of these studies were that, in the interest of miners' health, and for those working in other high dust environments, the quality of the half-mask should be assessed on the basis of workplace and stand tests. These are complementary and both should be included to ensure the correct assessment of the half masks. For the masks supplied by the mentioned mining companies, their filtering efficiency for PM2.5, as determined using the test stand, was excellent at over 99%.

3

Energetyczne zagospodarowanie potencjału cieplnego wody z procesów odwadniania kopalń

Drwięga Andrzej, Gliklich-Kostrzewa Bogna

Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie

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2019

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nr 4

3--13

PL

W artykule omówiono założenia circular economy w odniesieniu do wód kopalnianych i ich właściwości predysponujące je do wykorzystania jako niskotemperaturowego źródła ciepła i chłodu. Przedstawiono również przykłady instalacji geotermalnych wykonanych w Polsce i na świecie oraz prace zrealizowane w tym zakresie przez ITG KOMAG. W oparciu o zdobyte doświadczenia oraz przegląd wykonanych instalacji sformułowano założenia wstępne do projektowania instalacji odzysku ciepła i chłodu z wód kopalnianych.

EN

The article discusses the assumptions of Circular Economy in relation to mine waters and their properties that predispose them to be used as a low temperature source of heat and cold. Examples of geothermal installations made in Poland and in the world have also been presented as well as work carried out in this area by ITG KOMAG. The results of the analysis allow to state that mine waters are a stable source of low-temperature heat. They are used in mining areas in all climatic zones, in order to meet the diverse needs of consumers in the field of heating, cooling and hot water preparation. The chemical composition of the water, the volume of water resources and the possibility of using the existing drainage infrastructure, as well as the distance of end users from the heat source – ideally 150 to 500 m, without the need to isolate pipelines – play a significant role in the design of the heat recovery system based on mine water. These factors affect technical solutions such as: system configuration, location of the heat exchanger and the type of heat pump. They also translate into the level of investment outlays. High costs of building a system are compensated by the low costs of its operation and ecological effect of the investment. At the investment planning stage, it is beneficial to conduct a risk analysis aimed at identifying factors that may have a significant impact on its implementation. Heat recovery systems based on mine water can be used for both: active and closed mines, with heat exchange in a surface heat exchanger tank, individual heat pumps located at end users and the possibility of dropping used water or re-entering the underground. Supporting the heating system with cogeneration unit can be economically viable in the case of availability of waste fuel, such as methane. An additional effect would then be the reduction of harmful to the environment methane emission. Mine waters, thanks to the use of available resources, existing infrastructure and the technology of heat pumps, can become a valuable source of energy in a circular economy.