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Упит dcterms_subject_txt:variability of coal quality

2861 items

  • Laboratory testing of fly ash

    Miloš Šešlija, Aleksandra Rosić, Nebojša Radović, Milinko Vasić, Mitar Đogo, Milovan Jotić (2016)
    Fly ash is one of the most common waste materials created by burning of coal. It is composed of smaller particles, consisting mainly of aluminosilicate glass, mullite and quartz, which are collected by electrostatic separators (filter) of gaseous products arising from the combustion of coal. This paper presents the pozzolanic properties, mechanical properties, chemical and mineral composition of fly ash obtained in the combustion process in a power plant Nikola Tesla A (PPNT A) with the addition of a ...
    chemical composition, fly ash, mechanical properties, mineral properties, pozzolanic properties, X-ray diffraction
    ... 2298/JSC120716125I [4] SRPS B.H8.359. Methods of analysis of coal and coke - Determination of chemical composition of fuel ash - General requirements. // Belgrade (1973). [5] SRPS B.H8.360. Methods of analysis of coal and coke - Determination of silica (SiO2) in ash from solid fuels. // Belgrade ...
    ... Methods of analysis of coal and coke - Determination of barium oxide (BaO) in ash from solid fuels. // Belgrade (1973). [7] SRPS B.H8.362. Methods of analysis of coal and coke - Determination of ferric oxide (Fe2O3) in ash from solid fuels. // Belgrade (1973). [8] SRPS B.H8.363. Methods of analysis ...
    ... analysis of coal and coke - Determination of titanium oxide (TiO2) in ash from solid fuels. // Belgrade (1973). [9] SRPS B.H8.364. Methods of analysis of coal and coke- Determination of aluminum oxide (Al2O3) in ash from solid fuels. // Belgrade (1973). [10] SRPS B.H8.365. Methods of analysis of coal ...

  • Towards a Mining Equipment Ontology

    Ranka Stanković, Ivan Obradović, Olivera Kitanović, Ljiljana Kolonja (2012)
    ... n system itself is a result of several phases of software development during the long-term research of the problem of coal quality management. The first versions of the software related to the problem of coal homogenization was developed in 1998, whereas the essence of the SUKU system as it is now ...
    ... condition in the process of revitalization [8]. Taxonomies for other types of equipment were subsequently developed within the scope of the Technological coal mine information system [5]. A slightly more complex terminological resource in the form of a thesaurus was developed for geological terms ...
    ... resources in electronic format, preferably including relations of a semantic nature between terms. The simplest semantic relations are those between general and specific terms, such as coal mine, and open pit, as a specific type of coal mines. Such semantic relations result in hierarchies among terms ...

  • State and perspective of individual household heating in Serbia: A survey-based study

    Boban Pavlović, Dejan Ivezić, Marija Živković (2021)
    This paper presents the results of the household survey on individual household heating systems in Serbia. The survey was conducted in the period October to December 2020 with the participation of 1100 households with individual household heating systems. The information collected in the questionnaire can be separated into three main parts: basic household data, current heating system characteristics, and households’ perceptions and attitudes. The survey results provide unique and comprehensive information concerning individual household heating systems and the main ...
    Domaćinstva, Individualni sistemi grejanja, Korišćenje energije, Stavovi potrošača, Anketa, Srbija

  • Development of A Business Intelligence Tool For Accident Analysis in Mines

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Uroš Pantelić (2015)
    ... other terms. The example of lexical relations is established between general and more specific terms, such as "coal mine", and "open pit", which is a specific type of coal mine, also with synonyms such as "opencast", "surface mine", and "quarry". One example of development of mining ontologies has been ...
    ... Alexandru, 2010). One of the first terminological resources in the field of mining was developed at the University of Belgrade Faculty of Mining and Geology (FMG) within the Technological coal mine information system (Kolonja et al, 2006). Further growth and variety of terminological resources ...
    ... needs for decision making. Managements of mine plants that implement BI tools can make timely decisions of a higher quality thus improving the overall work safety of their employees. In this paper we presented the use of an ontology-based tool in improvement of the analysis and reporting system ...

  • Distribution of major and trace elements in the Kovin lignite (Serbia)

    Dragana Životić, Olga Cvetković, Predrag Vulić, Ivan Gržetić, Vladimir Simić, Konstantin Ilijević, Biljana Dojčinović, Suzana Erić, Bogdan Radić, Sanja Stojadinović, Snežana Trifunović (2019)
    geochemical and mineralogical study was performed on lignite samples from the Upper Miocene Kovin deposit, hosting three coal seams. The Kovin lignite is characterized by high moisture content, medium to high ash yield, medium to high sulphur content and a relatively low gross and net calorific value. The mineralogical composition, and major and trace element contents were determined by X-ray diffraction, scanning electron microscopy with energy dispersive Xray spectroscopy (SEM-EDS) analyses, and inductively coupled plasma optical emission spectrometry (ICP-OES). ...
    General Earth and Planetary Sciences, General Environmental Science
    ... im­ pacts of coal and coal use: possible solutions.– International Journal of Coal Geo­ logy, 50, 425– 443. doi: 10.1016/S0166­5162(02)00125­8 FINKELMAN, R.B., PALMER, C.A. & WANG, P. (2018): Quantification of the modes of occurrence of 42 elements in coal.– International Journal of Coal Geology, 185 ...
    ... B.H8.317:1988, (1988): Methods of analysis of coal and coke ­ Determination of volatile matter content.– Institute for Standardization of Serbia, Belgrade, Serbia, 6 p. (in Serbian). SRPS B.H8.318:1972, (1972): Methods of analysis of coal and coke ­ Determination of gross calorific value by the ...
    ... 56/603 88.60–88.80 MMiC MC – Stratified matrix coal (weakly gelified); XC – Xylite-rich coal; MXC – Mixture of matrix and xylite-rich coal and Mixture of xylite-rich and matrix coal; MMiC – Mixture of matrix and mineral-rich coal; MiC – Mineral-rich coal (TAYLOR et al., 1998). SUPPLEMENTARY MATERIAL ...

  • Actual contamination of the Danube and Sava rivers at Belgrade (2013)

    Milan Antonijević, Marija Arsović, Josef Cáslavský, Vesna Cvetković, Predrag Dabić, Mladen Franko, Gordana Ilić, Milena Ivanovic, Nevena Ivanović, Milica Kosovac, Dragana Medić, Slobodan Najdanović, Milica Nikolić, Jovana Novaković, Tatjana Radovanović, Djurdjina Ranić, Bojan Šajatović, Gorica Špijunović, Ivana Stankov, Jelena Tošović, Polonca Trebse, Olivera Vasiljević, Jan Schwarzbauer (2014)
    rečni sistemi, stanje zagađenja, organski zagađivači, teški metali, skrining analize, non-target screening
    ... for preselected pollutants could lead to totally different assessments of the quality of a river. In particular, the confrontation of target and non-target analyses indicates to potential misinter- pretation of the real state of pollution by restricted analytical approaches. SUPPLEMENTARY MATERIAL ...
    ... Serbia and 9Institute of Geology and Geochemistry of Petroleum and Coal, RWTH Aachen University, Germany (Received 5 November 2013, revised 14 February, accepted 23 February 2013) Abstract: This study was focussed on a comprehensive investigation on the state of pollution of the Danube and Sava Rivers ...
    ... levels. Note- worthy, surface water is becoming more and more relevant as a source of drink- ing water. Therefore, an appropriate water quality control is needed as a base for a sustainable usage of river water. Pollution of the aquatic environment caused by inorganic chemicals is con- sidered a major ...

  • Hydrogeochemical distribution of Ca and Mg in groundwater in Serbia

    Petar Papić, Jovana Milosavljević, Marina Ćuk, Rastko Petrović (2014)

  • Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

    Milan Kragović, Nenad Ristić , Jelena Gulicovski, Andrijana Nedeljković, Snežana Pašalić, Ivica Ristović, Marija Stojmenović (2021)
    sagorevanje lignita, otpadna šljaka, zamena cementa, proizvodnja maltera i betona, fizičko-mehanička i fizičko-hemijska karakterizacija
    ... classified as anthracite, bituminous coal, and lignite [4]. Lignite is a type of coal from the early stages of coalification whose properties are intermediate between peat and bituminous coal. Because of its low mining cost, easy access, high reactivity, and low price, the world’s annual lignite production ...
    ... classified as anthracite, bituminous coal, and lignite [4]. Lignite is a type of coal from the early stages of coalification whose properties are intermediate between peat and bituminous coal. Because of its low mining cost, easy access, high reactivity, and low price, the world’s annual lignite production ...
    ... Introduction Coal is a solid fuel that has been used as a primary fossil fuel for centuries. The world’s known coal reserves are much greater than those of gas and oil which means that it will be dominant in energy supply in the subsequent years [1–3]. Depending on the time of formation, coal can be classified ...

  • Surface functional groups and degree of carbonization of selected chars from different processes and feedstock

    Marija Ilić, Franz-Hubert Haegel, Aleksandar Lolić, Zoran Nedić, Tomislav Tosti, Ivana Sredović Ignjatović, Andreas Linden, Nicolai D. Jablonowski, Heinrich Hartmann (2022)
    The knowledge ofthe structural and chemical properties of biochars is decisive for their application as technical products. For this reason, methods for the characterization of biochars that are generally applicable and allow quality control are highly desired. Several methods that have shown potential in other studies were used to investigate two activated carbons and seven biochars from different processes and feedstock. The chars were chosen to cover a wide range of chemical composition and structural properties as a hardness ...
    Biougalj, različiti procesi dobijanja, različite sirovine, površinski aktivne grupe, x-ray, FT-IR,XPS
    ... according to the type of pyrolysis. The quality of the spectra is considerably reduced in comparison with spectra of well-defined molecular compounds. The structural and reflective properties of the chars and the presence of a variety of overlaying bands lead to less resolved IR bands of relatively low ...
    ... methods. None of the spectroscopic methods was found to be suitable for the quality control of all types of chars. The most valuable results were obtained by chemical analysis that, however, required the complete determination of the main elements, including that of oxygen, and of inorganic components ...
    ... further reduce the quality of the spectra. All spectra contain positive or negative double peaks of CO, in air at about 2300 cm !. They are a consequence of the improper compensation of the back- ground spectra due to varying CO» content in air and/or a considerable intensity loss of IR radiation between ...

  • WebGIS Cadastre of Abandoned Mines in Autonomous Province of Vojvodina

    Ranka Stanković, Nikola Vulović, Nikola Lilić, Ivan Obradović, Radule Tošović, Milica Pešić-Georgiadis (2015)
    ... Special attention was given to securing a high level and quality of project work, both regarding the quality of content, namely data and information, but also regarding the quality of structural relations among data, as well as quality of user interface featuring easy and simple search and display ...
    ... surface mining of coal by improving access to data, timely dissemination of data and understanding of geospatial data on different scales and at different levels [4]. Abandoned Mine Land Inventory System (e-AMLIS) (USA) includes information on abandoned mines that are in need of remediation, and ...
    ... overview of the use of the application on the basis of log data (logons) and data entry, as well as the number of visits of the site using Google analytics. Statistics of mining facilities and results of remote sensing by property type, by district, municipality, by mineral resource or method of re ...

  • A business intelligence approach to mine safety management

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Dejan Stevanović, Marija Radojičić (2016)
    ... needs for decision making. Managements of mine plants that implement BI tools can make timely decisions of a higher quality thus improving the overall work safety of their employees. In this paper we presented the use of an ontology-based tool in improvement of the analysis and reporting system with ...
    ... prevention are presented in [6]. One of the first terminological resources in the mining domain was developed at the University of Belgrade Faculty of Mining and Geology (FMG) within the Technological coal mine information system [7]. Further growth and variety of terminological resources for specific ...
    ... d between general and more specific terms, such as "coal mine", and "open pit", which is a specific type of coal mine, as well as synonyms relations, such as those between "opencast", "surface mine", and "quarry". One approach to development of mining ontologies has been reported in [5]. Some ...

  • Managing mining project documentation using human language technology

    Aleksandra Tomašević, Ranka Stanković, Miloš Utvić, Ivan Obradović, Božo Kolonja (2018)
    Purpose: This paper aims to develop a system, which would enable efficient management and exploitation of documentation in electronic form, related to mining projects, with information retrieval and information extraction (IE) features, using various language resources and natural language processing. Design/methodology/approach: The system is designed to integrate textual, lexical, semantic and terminological resources, enabling advanced document search and extraction of information. These resources are integrated with a set of Web services and applications, for different user profiles and use-cases. Findings: The ...
    Digital libraries, Information retrieval, Data mining, Human language technologies, Project documentation

  • Development of terminological resources for expert knowledge: a case study in mining

    Ljiljana Kolonja, Ranka Stanković, Ivan Obradović, Olivera Kitanović, Aleksandar Cvjetić (2015)

  • A Fuzzy Expert Model for Availability Evaluation

    Dejan Ivezić, Miloš Tanasijević, Predrag Jovančić, Radiša Đurić (2019)
    Each technical system within itself carries the great potential danger of possible occurrence of failure and damages. Mining machines are characteristic by great investment values, costs of unplanned shutdowns, complex working conditions, and environment and workers hazards. Systematic monitoring of the mining machinery is of great importance for the management of the mining companies. Availability is the overall concept of quality of service. Includes information regard to operating state, an idle state, a standby state and shut down. The ...
    raspoloživost, ekspertski sistem, fazi teorija, buldozeri
    ... investment values, costs of unplanned shutdowns, complex working conditions, and environment and workers hazards. Systematic monitoring of the mining machinery is of great importance for the management of the mining companies. Availability is the overall concept of quality of service. Includes ...
    ... Ignjatovic, D., Jovancic, P., Optimization of operation and costs of auxiliary mechanization in order to increase the utilization of overburden and coal systems on the open cast mines of Public Enterprise "Elektroprivreda" Serbia – research study, Faculty of Mining and Geology, Belgrade, 2018 (in Serbian) ...
    ... y and quality of service. Availability performance has a decisive influence on the dependability and the quality of service due to the known fact that the machine must be primarily available for operation in order to obtain performance. The achievement of the satisfactory value of the machine's ...

  • Dimenzionisanje deponija za ugalj

    Dinko Knežević, Božo Kolonja, Ranka Stanković, Aleksandra Tomašević, Dragana Nišić (2014)
    ... beltcon8/paper818.html 7. Stevanović D.R, Kolonja B.M., Stanković RM., Knežević D.N., Banković M. V., 2013, Application of stochastic models for mine planning and coal quality control, www.doiserbia.nb.rs/img/doi/0354-9836/2013%20OnLine-First/ 0354- 98361300031S.pdf 8. Erasmus J. H., Bulk Raw Materials ...
    ... 1982, Utvrđivanje potrebnih veličina deponija uglja za termoelektrane, Rudarski institut, Beograd 3. Carpenter M.A., 1999, Management of coal stockpiles, IEA Coal Research, London 4. Leontijević M., 2010, Mogućnosti homogenizacije uglja u sistemu P.K. "Tamnava" - termoelektrana "Nikola Tesla B" ...
    ... fakultet, Beograd 5. Zador A.T., 1994, Technology and Economy of blending and mixing, The best of bulk solids handling: Stacking, Blending and Reclaiming of bulk materials - B/94, Trans Tech Publication 6. Wolpers FM, 1995, Homogenization of bulk material in longitudinal and circular stockpile arrangements ...

  • Production of electricity from coal-fired power plants and accompanying CO2 emissions: comparison of EU-27 and US

    Uroš Djorgovski, Aleksandar Madžarević, Predrag Jovančić (2023)
    Even in the third decade of the 21st century, large power plants are still responsible for more than half of the electricity production in Europe and US. They predominantly use fossil fuels in their work, which results in the emission of pollutants into the air, soil and water. In addition to the production of electric energy, fossil fuels, including coal, are used for industrial purposes. Although the use of coal, especially in the countries of the European Union, is ...
    CO2, емисија, угаљ, термоелектрана, САД, ЕУ-27
    ... 4 shows the diagram of the total production of electricity in the countries of the European Union, as well as the generation of electricity from coal, as well as the share of coal in the energy mix of annual production. It remains an indisputable fact that the problems of climate change and CO» ...
    ... production in USA follows the trend of the rest of the world, increasing year by year, while the share of coal in the same decreases. Figure 5 shows a diagram of the total generation of electricity, electricity generation from coal, as well as the share of coal in it in the USA from 2000. US electricity ...
    ... characteristic years. Coal consumption in US peaked in 2005, but the total annual coal consumption in tons peaked in 2007 with 948,2 million tons of coal consumed in electric power sector [7]. Coal consumption declined since then, mainly because of a decline in the use of coal for electricity generation ...

  • Testing the energy value of different types of coal by the method of active thermography

    Stevan Đenadić, Ljubiša Tomić, Vesna Damnjanović, Predrag Jovančić, Dragutin Jovković (2020)
    In this paper, coal thermograms are presented and analyzed in order to determine their energy value. Two types of coal of different categories, brown and lignite, were selected for active thermographic imaging. The tested coal samples were processed before measurement so that they are similar in dimensions and have two plane-parallel smooth surfaces. The test samples were "primarily" heated under the same conditions and the process of their cooling was monitored by a thermal camera. "Then" they were cooled ...
    Infrared imaging, nondestructive testing, active thermography, coal.

  • Projection of SO2 emissions in coal power plants in Serbia

    Aleksandar Madžarević, Predrag Jovančić, Stevan Đenadić, Filip Miletić, Miodrag Ristović, Miroslav Crnogorac (2023)
    The production of electricity in the countries of South-Eastern Europe (SEE) was mainly related to the use of coal, predominantly lignite. The total installed capacity of thermal power plants using coal in these seven countries is 17.813 MW, distributed in 31 thermoblocks. The mentioned plants are the dominant pollutant emitters in all observed countries. Data on the largest emitters in the countries of the European Union and a comparison with SEE countries were collected. The calculation of emissions of ...
    енергeтика, емисије, СО2, угаљ, електране
    ... University of Belgrade, Faculty of Mining and Geology, Belgrade, SERBIA, E-mail: miroslav.crnogorac(ergf.bg.ac.rs Abstract: The production of electricity in the countries of South-Eastern Europe (SEE) was mainly related to the use of coal, predominantly lignite. The total installed capacity of thermal ...
    ... production [keSOx/MWh] 11,63 0,70 3. PROJECTION OF SO; EMISSIONS By studying the data on the amount of sulfur in the coal seam, the expected exploitation of coal in the coming period, as well as the operation of the desulfurization system, a projection of SO» emissions in the period up to 2040 was created ...
    ... more than 5 times the total amount of SO» input. Out of the total average amount of SO» produced in the amount of 86424 t, an average of 16759 t of SO» should go into the atmosphere. This value represents the permissible limit. 4. CONCLUSION Air pollution from coal-fired thermal power plants knows ...

  • Petrographical and organic geochemical study of the subbituminous coal from the Dubrava field, Aleksinac basin (Serbia)

    Željana Sekulić, Ksenija Stojanović, Achim Bechtel, Reinhard Sachsenhofer, Miomir Petrović, Ivan Kojić, Dragana Životić (2019)
    ... decrease of content of short-chain (С15-Сг0) and increase of long-chain (Cz6-Ca3) homologues. The obtained results suggest lowering of the water table during the formation of the Main coal seam. This change resulted in lesser inundation and deposition of MM associated with smaller input of bacterial ...
    ... ratios (6'3) of individual biomarkers were used to evaluate the origin and depositional environment of OM. The content of vitrinite group macerals increases from top to bottom of the Main coal seam which is associated with a notable decrease of liptinite and mineral matter (MM). Contents of collotelinite ...
    ... contains higher amount of MM, associated with high amount of pyrite. Biomarker composition is relatively similar to that of samples from deeper parts of the Main coal seam and coal layer located within the lower oil shale package, however with slightly higher input of gymnosperm vegetation and ...

  • Development of the Availability Concept by Using Fuzzy Theory with AHP Correction, a Case Study: Bulldozers in the Open-Pit Lignite Mine

    Stevan Đenadić, Dragan Ignjatović, Miloš Tanasijević, Uglješa Bugarić, Ivan Janković, Tomislav Šubaranović (2019)
    Availability is one of the most used terms in maintainability engineering. This concept is used to denote: The quality of service of an engineering system, i.e., machines, weak points’ analysis, asset management, as well as making decisions in the process of life cycle management. Availability is an overall indicator and contains partial indicators that are oriented towards reliability, maintenance, and logistical support. Availability presents a variable value and changes in time and space. Usually, availability is shown as the ...
    raspoloživost, fazi teorija, AHP višekriterijumska analiza, eksperska ocena, buldozer
    ... 30. Ignjatovic, D.; Jovancic, P. Optimisation of Operation and Costs of Auxiliary Mechanization in Order to Increase the Utilization of Overburden and Coal Systems on the Open-Cast Mines of Electrical Power Supply of Serbia—Research Study; Faculty of Mining and Geology: Belgrade, Serbia, 2018. © ...
    ... defining quality of service are not consistent, but have considerable ambiguity, and cannot be expressed quantitatively, so the model of integration, based on the theory of fuzzy sets, has been developed. Theories of fuzzy logic are specifically used for description and proposition of indicators ...
    ... method. The model contains structural decomposition of availability as an indicator quality of service of the engineering system, their independent analysis, and ranking, and finally gives the possibility of composition. Structural definitions of each outcome are given in accordance with the work ...