Strategic management of transport tasks realization of an underground transport systems working in hard coal mine

Abstract. Methane (CH4) emissions from coal production amount to roughly one-third of European anthropogenic CH4 emissions in the atmosphere. Poland is the largest hard coal producer in the European Union with the Polish side of the Upper Silesian Coal Basin (USCB) as the main part of it. Emission estimates for CH4 from the USCB for individual coal mine ventilation shafts range between 0.03 and 20 kt a−1, amounting to a basin total of roughly 440 kt a−1 according to the European Pollutant Release and Transfer Register (E-PRTR, http://prtr.ec.europa.eu/, 2014). We mounted a ground-based, portable, sun-viewing FTS (Fourier transform spectrometer) on a truck for sampling coal mine ventilation plumes by driving cross-sectional stop-and-go patterns at 1 to 3 km from the exhaust shafts. Several of these transects allowed for estimation of CH4 emissions based on the observed enhancements of the column-averaged dry-air mole fractions of methane (XCH4) using a mass balance approach. Our resulting emission estimates range from 6±1 kt a−1 for a single shaft up to 109±33 kt a−1 for a subregion of the USCB, which is in broad agreement with the E-PRTR reports. Three wind lidars were deployed in the larger USCB region providing ancillary information about spatial and temporal variability of wind and turbulence in the atmospheric boundary layer. Sensitivity studies show that, despite drawing from the three wind lidars, the uncertainty of the local wind dominates the uncertainty of the emission estimates, by far exceeding errors related to the XCH4 measurements themselves. Wind-related relative errors on the emission estimates typically amount to 20 %.

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Ocena Właściwości Technogenicznych Utworów Glebowych Technosols Zawierających Siarczki Żelaza / Assessment of Properties of Technogenic Soils Technosols Containing Iron Sulfides

Soil Annual Science ◽

10.2478/v10239-012-0031-2 ◽

2012 ◽

Vol 63 (3) ◽

pp. 37-42 ◽

Cited By ~ 1

Author(s):

Łukasz Uzarowicz ◽

Alina Maciejewska

Keyword(s):

Heavy Metals ◽

Coal Mine ◽

Mine Tailings ◽

Hard Coal ◽

Iron Sulfides ◽

Radioactive Elements ◽

Rock Fragments ◽

Technogenic Soils ◽

Strong Acidity

Abstract Technogenic soils (Technosols) developed from mine tailings containing iron sulfides occurring in the area of the abandoned .Siersza. hard coal mine in Trzebinia and the abandoned .Staszic. pyrite mine in Rudki were investigated in order to assess their properties. The study revealed that the most adverse properties of the technogenic soils investigated are: strong acidity (pH below 3), the presence of large amounts of rock fragments containing unweathered sulfides, as well as the occurrence of heavy metals (e.g. Pb, As, and Tl) and radioactive elements (U and Th). All these properties should be taken into account during management of the studied mine tailings.

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Failure Behavior and Energy Storage and Release of Hard Coal under Different Static and Dynamic Loading States

Advances in Civil Engineering ◽

10.1155/2020/8837289 ◽

2020 ◽

Vol 2020 ◽

pp. 1-14

Author(s):

XianJie Hao ◽

GuangYao Pan ◽

Chaoxing Ma ◽

Yingnan Wei ◽

Zeyu Chen

Keyword(s):

Dynamic Loading ◽

Coal Mine ◽

Static Loading ◽

Dynamic Compression ◽

Hard Coal ◽

Failure Behavior ◽

Static Compression ◽

Energy Rate ◽

Energy Accumulation ◽

Static Tensile

The study of the energy accumulation and rate of release in hard coal under dynamic, static, and coupled dynamic-static loading and its failure mode is of significance when studying the mechanism underpinning coal mine dynamic disasters such as rock burst, coal, and gas outburst. In this paper, four experimental methods (uniaxial compression, Brazilian splitting, and coupled dynamic-static tensile and coupled dynamic-static compression) were used to analyze the energy accumulation, energy rate of release, and failure modes of this type of hard coal under different loading conditions. It was concluded that (1) the energy accumulation and rate of releases of this type of hard coal under static compression are 17.63–179.90 times and 18.57–13157.89 times those under static tension; the energy accumulation and rate of releases in dynamic compression are 2.11–248.53 and 0.23–48 times those under dynamic tension, respectively. (2) During dynamic loading, the ratio of compressive energy accumulation to tensile energy accumulation is reduced by 1.6 times compared with static loading, and the ratio of compressive energy release to tensile energy rate of release is decreased by 363.84 times compared with static loading. (3) The energy accumulation and rate of releases of this type of hard coal for dynamic tensile are, respectively, 2.64–17.42 and 1.07–5.26 times those under static tensile load; the energy accumulation under dynamic compression is greater than that under static compression, being 0.24–15.04 times that under static compressive, but the energy rate of release under dynamic compression is 0.0003–0.56 times that under static compression. (4) The greater the prepeak energy accumulation, the greater the degree of damage of the coal sample at each stage, and also the higher the degree of fragmentation after the failure. The research results play an important guiding role in further understanding the mechanism of coal mine dynamic disasters.

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A Study of the Laws of Abnormal Gas Emissions and the Stability Controls for Coal Mine Walls in Deeply Buried High-Gas Coal Seams

Advances in Civil Engineering ◽

10.1155/2020/8894854 ◽

2020 ◽

Vol 2020 ◽

pp. 1-12

Author(s):

Anying Yuan ◽

Hao Hu ◽

Qiupeng Yuan

Keyword(s):

Coal Seam ◽

Water Content ◽

Coal Mine ◽

Gas Diffusion ◽

Hard Coal ◽

Coal Seams ◽

Gas Emissions ◽

Soft Coal ◽

Pressure Water ◽

Gas Coal

At the present time, it is considered to be of major significance to study the gas emission law and stability controls of coal bodies in deeply buried high-gas coal seams. For this reason, in view of the specific problems of gas emissions caused by unstable rib spalling in coal mine walls, comprehensive research methods were adopted in this study, in order to conduct an in-depth examination of micropore structure parameters, gas desorption, diffusion laws, and coal stability levels. The results showed that the development degree of the pores above the micropores, as well as the small pores in soft coal seams, was better than those observed in hard coal seams. In addition, the gas outburst phenomenon was found to have more easily formed in the soft coal seams. The coal body of the No. 6 coal seam in the Xieqiao Coal Mine not only provided the conditions for gas adsorption but also provided dominant channels for gas diffusion and migration. The abnormal gas emissions of the No. 6 coal seam were jointly caused by the relatively developed pores above the small holes in the coal body, rib spalling of coal mine walls, and so on. The research results also revealed the evolution law of mechanical characteristics of the No. 6 coal seam under different water content conditions. It was found that the strength levels of the No. 6 coal seam first increased and then decreased with the increase in water content, and the water content level at the maximum strength of the coal seam was determined to be 7.09%. This study put forward a method which combined the water injection technology of long-term static pressure water injections in deep coal mining holes and real-time dynamic pressure water injections in shallower holes. Field experiments were successfully carried out.

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INNOVATIVE APPLICATION OF QUALITY MANAGEMENT TOOLS IN A HARD COAL MINE

15th International Multidisciplinary Scientific GeoConference SGEM2015, SCIENCE AND TECHNOLOGIES IN GEOLOGY, EXPLORATION AND MINING ◽

10.5593/sgem2015/b13/s3.054 ◽

2011 ◽

Author(s):

Michal Zasadzien

Keyword(s):

Quality Management ◽

Coal Mine ◽

Hard Coal ◽

Management Tools

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An Assessment of Selected Work Organisation Variants in an Underground Hard Coal Mine with Consideration to Unit Mining Costs

Inżynieria Mineralna ◽

10.29227/im-2019-01-50 ◽

2021 ◽

Vol 1 (1) ◽

Author(s):

Roman MAGDA

Keyword(s):

Comparative Analysis ◽

Coal Mine ◽

Working Time ◽

Hard Coal ◽

Work Organisation ◽

Production Potential ◽

Continuous Work ◽

Annual Working ◽

Public Holidays ◽

Means Of Production

The aim of the paper is to compare two forms of work organisation, the first of which assumes extending the mine’s operation fromfive to six days a week, and the other – implementing a continuous work organisation system. To illustrate this in terms of unitmining costs, a model hard coal mine was used. In addition to the current organisational solution, which serves as the startingpoint for comparative analysis, solutions were proposed to increase the degree of utilisation of the existing production potential,mainly with regard to technical means of production and human resources. The proposed solutions assume increasing the intensityof use of technical means of production on an annual basis by extending the annual working time of selected mining crews. For thecomparative analysis, three variants of the mine’s operation in terms of the production organisation system were adopted. UnderVariant I, treated as the baseline option, the current organisation of production is to be continued (5 days a week, Monday to Friday,excluding public holidays). Variant II provides for extending the working time of some mining crews to 6 days a week (fromMonday to Saturday, excluding public holidays). Variant III assumes continuous operation for 7 days a week (excluding publicholidays and several days for shaft inspections). Having adopted appropriate baseline assumptions for simulation calculations anda set of input data reflecting the characteristics of a specific mine, simulation calculations were performed and their results wereused to carry out a comparative analysis of selected organisational solutions.

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Aspects of Motivation and Engagement of Employees in Their Work Based on the Example of Mining Companies

Inżynieria Mineralna ◽

10.29227/im-2020-01-80 ◽

2020 ◽

Vol 1 (1) ◽

Author(s):

Barbara KOWAL ◽

Małgorzata W YGANOWSKA

Keyword(s):

Coal Mine ◽

Hard Coal ◽

Significance Level ◽

Factors Affecting ◽

Negative Opinion ◽

Mining Companies ◽

Motivation And Engagement ◽

Survey Results

The paper presents an analysis of selected aspects of motivation and engagement of hard coal mine employees working in longwall faces. The analysis of survey results covers selected questions from a broader survey conducted in the analyzed mining companies. The miners had a negative opinion on the incentive programme in their workplaces, stating that it is ineffective. The survey also included factors affecting the engagement of the entire research sample in their work, showing their significance level for the respondents.

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Solutions of diesel drives for use in underground workings of hard coal mine

Combustion Engines ◽

10.19206/ce-117133 ◽

2010 ◽

Vol 142 (3) ◽

pp. 28-40

Author(s):

Marek BRZEŻAŃSKI ◽

Edward PIECZORA ◽

Krzysztof KACZMARCZYK

Keyword(s):

Coal Mine ◽

Hard Coal ◽

Exhaust Gas ◽

Diesel Combustion ◽

Combustion Engines ◽

Mining Machinery ◽

Underground Workings ◽

Technical Solutions ◽

Toxic Components

The examples of application of combustion engines for the mining machinery drive have been presented in the article. The corresponding regulations concerned diesel combustion engines use in mines have been also presented. Moreover, the new technical solutions in such type engines aiming at the use safety increase and the exhaust gas toxic components emission decrease have been proposed.

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Issues of photovoltaic installation size choice for a hard coal mine

E3S Web of Conferences ◽

10.1051/e3sconf/201912301014 ◽

2019 ◽

Vol 123 ◽

pp. 01014

Author(s):

Sylwester Kaczmarzewski ◽

Piotr Olczak ◽

Artur Halbina

Keyword(s):

Coal Mine ◽

Renewable Energy Sources ◽

Electricity Consumption ◽

Electricity Demand ◽

Hard Coal ◽

The European Union ◽

Upper Silesian Coal Basin ◽

Hourly Data ◽

Hard Coal Mining ◽

Demand Coverage

Poland is the leader in hard coal mining in the European Union and in generation of electricity on this basis, it is related also to low generation of energy from renewable energy sources, in particular photovoltaic installations. The paper analyses the potential of PV installations application for the needs of a selected hard coal mine from the Upper Silesian Coal Basin. Using the hourly data on its electricity consumption in 2018 various sizes of PV installations were selected, a simple payback period was calculated as well as the percentage of energy from the installation use for the current mine operations. It has been shown that in the case of a mine, having available 20 MW of ordered power and average consumption of approx. 14 MW, an installation of 20 MWp rating covers approx. 15% of the electricity demand per year, while for 1 o’clock p.m., i.e. the hour at which most frequently the peak consumption occurred, the share in electricity demand coverage by the PV installation of this power on average amounts to approx. 50% per year.

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