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Упит dcterms_subject_txt:variability of coal quality

2838 items

  • Improving efficiency of thermal power plants through mine coal quality planning and control

    Mirjana Banković, Dejan Stevanović, Milica Pešić, Aleksandra Tomašević, Ljiljana Kolonja (2018)
    Главни циљ контроле квалитета угља у рудницима лигнита је снабдевање термоелектрана угљем чији квалитет мора да се креће унутар одређених квалитативних ограничења. Карактеристике угља могу да утичу на ефикасност, поузданост и расположивост како котла тако и јединица за контролу емисије. У овом раду аутори су презентовали интегрисану симулацију рударског процеса као нови приступ у истраживању променљивости калоричне вредности угља приликом експлоатације комплексног лежишта лигнита. Резултати таквог приступа омогућавају драгоцен увид у перформансе континуалног рударског система у смислу контроле променљивости ...
    mine planning, variability of coal quality, simulation, coal blending

  • Coal homogenization stockyard sizing “Tamnava – Zapad” case study

    Božo Kolonja, Dinko Knežević, Ranka Stanković, Dejan Stevanović, Detlef Trummer (2016)
    ... different primary parameters. The number of layers in each pile is selected depending on variability and the value range of the parameter defining the coal quality, while the stacking method depends on the number of layers. STACKING METHODS AND NUMBER OF LAYERS PER PILE Generally speaking, there ...
    ... (Benndorf, 2013.) integrates simulated realizations of the deposit with a simulation of transport- and blending models of mining operation. Beretta, et al (2010) used geostatistical simulation for reducing coal quality attributes variability using properly designed blending piles. These models allow ...
    ... increasing the number of layers decreases variability, but the average value remains the same, so if the average value is outside the desired range, there is no stockyard geometry that will produce the desired output. Considering the increasing variability of coal quality in TZP, determining the ...

  • Approach to operational mine planning: Case study Tamnava West

    Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Ranka Stanković (2014)
    ... case of Tamnava-West coal pit. The coal quality control management is of vital importance for successful production since coal mine and power plant objectives are strongly connected. Coal quality control is complex and comprehensive problem which depends of many factors and elements of production ...
    ... is the case for many coal mines in Serbia. The majority of coal production is used for generation of electricity in power plant. This fact is the main reason why production objectives of coal mine and power plant are strongly connected. Due to the fluctuation of the coal quality, operational mine ...
    ... mine planning (as a part of coal homogenization process), is of critical importance for managing successful coal quality control and meeting criteria of power plant. This paper investigates advantage of proper operational planning on coal quality control process and overall production performance ...

  • Application of stochastic models for mine planning and coal quality control

    Dejan Stevanović, Božo Kolonja, Ranka Stanković, Dinko Knežević, Mirjana Banković (2014)
    ... prior knowledge of the coal quality of planned mining blocks. Coal homogenization is one of mostly used options for optimisation of sulfur emis- sions from desulfurization power plants [2]. However, decisions about coal homogenization must deal with uncertainty and variability in coal properties, and ...
    ... develop any coal quality control strategy, the mine should have the ca- Stevanovi}, D. R., et al.: Application of Stochastic Models for Mine Planning ... 1362 THERMAL SCIENCE: Year 2014, Vol. 18, No. 4, pp. 1361-1372 pability to predict both the quality and the variability of the pertinent coal parameters ...
    ... controlling coal quality. According to the model, it is possible to reduce the variability of the grades exponentially as the mass of the pile increases. Acknowledgments The research outlined in this paper was supported by the Serbian Ministry of Educa- tion, Science and Technological Development of the ...

  • Application of Project Management Process on Environmental Management System Improvement in Mining-Energy Complexes

    Jelena Malenović Nikolić, Dejan Vasović , Ivana Filipović , Stevan Mušicki, Ivica Ristović (2016)
    menadžment, rudrastvo i energetski kompleksi, okruženje, održivi razvoj, mrežno planiranje
    ... use compared to other types of coal Rational consumption of coal reserves Energy efficiency incentive Use of alternative energy sources and better types of coal Measures to be taken in order to mitigate the impact of surface mining, preserve the quality of the environment, and achieve sustainable development ...
    ... disposal of tailings, ash, and slag (A4) have continuous negative impact on the quality of water and soil, with the maximum value for the degree of impact. The impact of transport of coal and tailings on environmental quality is estimated with a second degree of impact and probability of occurrence ...
    ... areas of land (A3); and inadequate disposal of tailings, ash, and slag (A4) have continuous negative impact on the quality of water and soil, with the maximum value for the degree of impact. The impact of transport of coal and tailings on environmental quality is estimated with a second degree of impact ...

  • Coal cleaning before combustion – practice and experience in Serbia

    Milena Kostović, Ivana Simović, Nebojša Kostović, Nina Pantelić (2022)
    Lignit, Čišćenje uglja, Kvalitet uglja, Termoelektrane

  • Application of the Fuzzy theory in the evaluation of operating parameters of auxiliary mechanization on open-cast coal mine, case study: pipelayers

    Stevan Djenadić, Miloš Tanasijević, Filip Miletić, Predrag Jovančić (2022)
    Achieved operating parameters are the main indicator of the work quality and selection of mining machines. The effectiveness of a coal mine is correlated with the availability of basic and auxiliary machines. The main task of auxiliary machines in lignite mines is to achieve optimal working conditions. From an economic point of view, auxiliary machines generate up to 20% of the lignite mines' total costs. These are the primary reasons for analyzing their current work and making decisions in ...
    upotrebni kvalitet, fazi teorija, rudarske mašine

  • Research on Power Plant Ash Impact on the Quality of Soil in Kostolac and Gacko Coal Basins

    Savić Dragana, Nišić Dragana, Malić Nenad, Dragosavljević Zlatko, Medenica Dragan (2018)

  • Conversion of land areas after coal mine closure and reclamation

    Radmila Gaćina, Bojan Dimitrijević, Sanja Bajić (2023)
    Otkopavanje uglja površinski i podzemno praćeno je degradacijom zemljišta, promenom formiranja predela i izmenom flore i faune. Od velikog značaja je razvoj novih naučno utemeljenih pristupa obnovljanje antropogeno poremećenih predela zasnovanih na formiranju rekultivacionih i rudarskih tehnologija. Apsolutno je neophodno obezbediti sveobuhvatno kvalitetno očuvanje zemljišnih i vodnih resursa i odrediti rekultivisano zemljište za novu namenu. U ovom članku je dat pregled najpopularnijih metoda rekultivacije zemljišta i mogućnosti rekultivacije zemljišta nakon završetka rekultivacije i zatvaranja rudnika uglja.
    rekultivacija, melioracija, revitalizacija, otkopavanje uglja, održivi razvoj
    ... collecting, assessing: and mapping the environmental data concerning coal mining activities is still missing in contrast to the sociO-economic concern. The same can be applied to the quality land reclamation and follow-up use of reclaimed land. Even though there is considerable progress in recultivation ...
    ... thickness of bulk overburden material is 40-50 m. The area belongs to “Drmno” open pit is in the eastern part of the Kostolac coal basin, 1.e., east of the Mlava River. (Figure 1) igure 1. Location of study area - Drmno The Kostolac mining and energy basin is part of the municipality of Kostolac ...
    ... and possibilities of reclaimed land after the completion of reclamation and closure of the coal mine. Keywords: recultivation, reclamation, revitalisation, coal mining, sustainable development 1. INTRODUCTION Mining activity has a large-scale impact on the environment. Coal mining has been quite ...

  • The optimization of auxiliary machinery in open-cast lignite mines: a case study of bulldozers

    Dragan Ignjatović, Predrag Jovančić, Stevan Đenadić, Ivan Janković, Ivica Ristović (2019)
    One of the most important prerequisites for the successful operation of the open-cast lignite mine is to carry out all the auxiliary works timely with the necessary quality. The most important and most commonly used auxiliary machines are bulldozers. Engaging time of bulldozers use is in direct relation with the coefficients of the time and capacity utilization of the continuous system for the excavation of coal and tailings, which indicates their importance. More than 100 bulldozers have been hired ...
    open-cast coal mine, auxiliary works, bulldozers, optimization, availability
    ... resources and costs of auxiliary mechanization to increase utilization of overburden and coal systems on open pit mines of EPS (in Serbian) (2018) Study, Faculty of Mining and Geology, Belgrade 2. Jovantié, P. Maintenance of mining machines (in Serbian), University of Belgrade — Faculty of Mining and Geology ...
    ... In-time replacement of auxiliary machines and vehicles; Usage of proven and quality machines with implemented unification as much as possible; Improvement of maintenance system; Implement modern and improved technologies in machine operation. Execution of these activities or just part of them will reduce ...
    ... Power Гтаизту of Serbia. |Тће је cycle of these machihes is 5–10 years, 50 И is hecessary 10 replace тће complete equipmeht several times тт the lifetime ој the mine. The purchasing and the operational costs of auxiliary machihnes are high, and тп the 10141 cost of coal excavating mehtioned cost are fFom ...

  • Valorization of non-balanced coal reserves in Serbia for underground coal gasification

    David Petrović, Lazar Kričak, Milanka Negovanović, Stefan Milanović, Jovan Marković, Nikola Simić, Ljubisav Stamenić (2019)
    In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for ...
    ugalj, gasifikacija, zaštita životne sredine, skladištenje, solarna
    ... The final quality of gas — syngas depends on many influential parameters related to drilling options, geological characteristics and coal quality. Technological process of UCG The technological process of UCG involves the preparation of a coal gasification layer and consists of drilling vertical ...
    ... vapor (H.O) and gas, where water vapor and carbon from the coal generate H», and CO. In order to improve the quality of the gas ob- tained, the concentrations of H,, CO and CH, · Figure4. Sehematic of CRIP process compared are of prime importance, since CO, is an inert - to traditional methods ...
    ... can be mitigated by the quality selection of the site for gasification. Regarding climate change and other environmental concerns, significant investments in clean coal technologies are evident in the world, with the alm of making rational use of this significant and relatively inexpensive energy ...

  • Legal framework for recultivation of degraded areas caused by mining exploitation

    Radmila Gaćina (2023)
    Prilikom površinske i podzemne eksploatacije uglja eksploatacioni sistemi oštećuju veće ili manje površine zemljišta. Iskustva pokazuju da su oštećenja zemljišta znatno veća kod površinske eksploatacije, gde je prostora degradiran ne samo u konturi rudnika i okoline, već se promene takođe dešavaju u prirodnom okruženju. U članku su predstavljeni rezultati studije zakonskih okvira rekultivacije u nekim zemljama sveta i u Srbiji. Praktično iskustvo rekultivacije pokazalo je da iskorišćenje i devastacija tokom rudarske aktivnosti predstavljaju opasnost ne samo za pogođena ...
    rekultivacija, melioracija, otkopavanje uglja, zakonska regulativa
    ... redevelopment, the restoration of its productivity, environmental quality, economic and aesthetic values. The area of land reclamation damaged by surface coal exploitation is widely covered by legal regulations and that it is the responsibility of several ministries, more precisely their authorities ...
    ... opencast coalmine, underground coal mine, metal mine, petroleum and natural gas (including coal-bed gas), construction projects, and uranium mine). Legal framework in the field of recultivation of degraded areas ... 31 Further, Completion Standards on Land Reclamation Quality (CSLRQ) was issued in ...
    ... not affect the quality of technical solutions and their implementation. Identifying: development of the legal framework governing the restoration of disturbed land areas, the revealed stage-by-stage evolution of the legislative base of recultivation indicates a 10-year quality gap between the ...

  • Identification of the Best Available Renewable Energy Source for Electricity Production in Serbia

    Boban Pavlović, Dejan Ivezić, Marija Živković (2020)
    Around 2/3 of electricity production in Serbia originates from coal-fired thermal power plants. The most significant domestic coal deposits are lignite deposits, a type of low -quality coal that causes negative health, climate and environmental impacts during the combustion. To reduce those negative impacts on domestic electricity production and to promote environmental awareness, the Serbian Energy Sector Development Strategy and the National Action Plan for Use of Renewable Energy Sources indicate the plan for increasing the share of ...
    Strategija obnovljive energije, Održiva energija, Proizvodnja električne energije, Solarna energija, Biomasa, Hidroenergije, Energija vetra
    ... Serbia originates from coal-fired thermal power plants. Th e m ost significant dom estic coal deposits are lignite deposits, a type of low -quality coal that ca uses negative h ealth, climate a nd environmental im pacts during the com bustion. To reduce th ose n egative im pacts on dom estic ...
    ... ac.rs The Digital repository of The University of Belgrade Faculty of Mining and Geology archives faculty publications available in open access, as well as the employees' publications. - The Repository is available at: www.dr.rgf.bg.ac.rs Abstract A r ound 2/3 of electricity production in Serbia ...
    ... Sector Development Strategy and the National Action Plan for Use of Ren ewable En ergy Sources in dicate the plan for in creasing the share of r en ewable energy sou r ces (RES) in electricity production. Serbia is obliged to reach 27% of the gross energy final con sumption prov ided from the RES u ...

  • Study of the Synergetic Effect of Co-Pyrolysis of Lignite and High-Density Polyethylene Aiming to Improve Utilization of Low-Rank Coal

    Ivan Kojić, Achim Bechtel, Nikoleta Aleksić, Dragana Životić, Snežana Trifunović, Gordana Gajica, Ksenija Stojanović (2021)
    Polimeri i plastika, opšta hemija
    ... type in humic coal [26]. In organic geochemical investigations, different pyrolytic methods are also widely used for estimation of the origin, type/quality, depositional environment, maturity, and hydrocarbon generation potential of sedimentary organic matter (OM) in the oil shale, coal, and source rocks ...
    ... between plastics- and coal thermal decomposition intermediates, during pyrolysis, may have a positive impact on the yield and quality of the obtained products. In previous studies, the synergetic effect (increase of experimental yield in relation to theoretical yield) during coal and plastics co-pyrolysis ...
    ... than pyrolysis of lignite of better quality (64.35% of carbon, dry basis, and net calorific value of 25.78 MJ/kg) at 600 ◦C [16]. The yields of liquid and gaseous products of lignite/HDPE co-pyrolysis at 500 ◦C are also higher than the yields of these products obtained by mild liquefaction of lignite (t ...

  • Effects of Energy Production and Consumption on Air Pollution in Serbia

    Marija Živković (2019)
    Energy production and combustion, mostly from unregulated or inefficient fuel combustion, are the single most important anthropogenic sources of air pollutant emissions. Energy sector in Serbia is highly fossil fuel intensive: 87.88% of energy consumed in Serbia is related to fossil fuels, while almost 95% of energy sources are combusted. In 2017. energy related carbon dioxide emission in Serbia is was 47.95 million tones. The main source of carbon dioxide emission was coal, responsible for almost 70% of energy ...
    energy related emissions, Serbia
    ... Energy is essential to economic and social development of each community and improved quality of life of citizens. Energy demand in the world has a constant growth, which is driven by increased number of inhabitants and growth of life standard 1. Much of the world's energy is currently produced and consumed ...
    ... 2007-2017 b) structure of total primary energy consumption in 2017 Coal is mainly used for electricity generation i.e. 88% of total coal energy is utilized in thermal power plants or CHPs. Structure of electricity generation by source is presented in Figure 3. In average about ¾ of electricity in Serbia ...
    ... 95 million tones. The main source of carbon dioxide emission was coal, responsible for almost 70% of energy related carbon dioxide emission in the country. Currently the transport sector is the main source of pollution in urban areas in Serbia, while the main sources of air pollution are: biomass (firewood) ...

  • Rezultati geoloških istraživanja lignita Kostolačko-kovinskog ugljonosnog basena – geološke i morfostrukturne karakteristike

    Bogoljub Vučković, Biljana Radovanović, Vesna Matić, Lidija Glamočanin, Bogdan Radić, Ksenija Eraković, Dragana Životić (2022)
    Geološka istraživanja Kostolačkog basena i ležišta Kovin vrše se više od 80 godina, dok eksploatacija traje više od 100 godina. Tokom dugog perioda rudarskih aktivnosti na površini od oko 320 km2, izbušeno je preko 3.200 bušotina i više od 265.000 m jezgra. Nova saznanja o geološkim karakteristikama, morfologiji i kvalitetu ugljenih slojeva nameću neophodnost reinterpretacije i izrade jedinstvenog 3D modela Kostolačko-kovinskog basena. Primenom savremenih softverskih paketa olakšano je povezivanje ugljenih slojeva sa posebnim osvrtom na morfologiju i kvalitet slojeva i ...
    lignit, Kostolac, Kovin, geološka istraživanja, 3D model

  • Steel Arch Support Deformations Forecast Model Based on Grey–Stochastic Simulation and Autoregressive Process

    Luka Crnogorac, Suzana Lutovac, Rade Tokalić, Miloš Gligorić, Zoran Gligorić (2023)
    Relatively large deformations of the steel arch support in underground coal mines in the Republic of Serbia present one of the main problems for achieving the planned production of coal. Monitoring of the critical sections of the steel arch support in the underground roadways is necessary to gather quality data for the development of a forecasting model. With a new generation of 3D laser scanners that can be used in potentially explosive environments (ATEX), deformation monitoring is facilitated, while ...
    čelična podgrada, prognoza deformacija, vremenske serije, grey-stohastička simulacija, autoregresija, podzemni rudnik uglja

  • Ograničenja primene optimizacionih algoritama u slučaju kopova

    Dejan Stevanović, Mirjana Banković, Milica Pešić Georgiadis, Petar Marković, Dejan Ranković (2020)
    Proces optimizacije površinskih kopova, kao sastavni deo strateškog planiranja, veoma je važan sa stanovišta ostvarivanja maksimalnih efekata proizvodnje. To je složen zadatak koji vrlo često podleže vrlo strogim geometrijskim i drugim praktičnim rudarskim ograničenjima. Ova ograničenja u posebno su izražena na površinskim kopovima uglja, te u značajnoj meri mogu povećati stepen neizvesnosti rudarskog projekta, odnosno izazvati neželjena dejstva u pogledu profitabilnosti poslovanja. Iz tog razloga, veoma je važna primena savremenih optimizacionih alata, koji u značajnoj meri mogu olakšati celokupan ...
    ... Pešić M., Tomašević A. & Kolonja B.: Improving Efficiency of Thermal Power Plants Through Mine Coal Quality Planning and Control. Thermal Science, 22(1B), pp.721-733, 2017 Benndorf J.: Investigating the variability of key coal quality parameters in continuous mining operations when using stockpiles ...
    ... Application of efficient methods of conditional simulation for optimising coal blending strategies in large continuous open pit mining operations. International Journal of Coal Geology, 112, 141-153, 2013 Naworyta W., Sypniowski S. & Benndorf J.: Planning for reliable coal quality delivery c ...
    ... considering geological variability: A case study in polish lignite mining. Journal of Quality and Reliability Engineering, 2015 Stevanović D., Banković M., Pešić Georgladis M., Stanković R.: Approach to operational mine planning: Case study Tamnava West, Tehnika, No 6, Savez inženjera i tehničara ...

  • Effectiveness Analysis of Different Bucket-wheel Excavators

    Stevan Đenadić, Predrag Jovančić, Dragan Ignjatović, Miloš Tanasijević, Filip Miletić (2021)
    Coal production in open-pit lignite mines in the Republic of Serbia is performed with continuous work systems. In addition to coal production, the same systems are used for the exploitation of large quantities of overburden. According to the reliability concept, continuous systems are in linear connection. If the failure occurs in one part of the system, that will produce a downtime of the entire system. The initial and most important factor of continuous systems is the bucket-wheel excavator. It ...
    bucket-wheel excavator, open-pit coal mine, mining, multi-criteria decision methods

  • Wells calculation for the protection of opencast mine Radljevo North from groundwater

    Dušan Polomčić, Vladimir Petković, Miloš Jeremić (2018)
    Za projektovanje kvalitetnog sistema zaštite jednog površinskog kopa od podzemnih voda bitno je da ulazni podaci budu verodostojni, kako bi se na osnovu njih izvršili potrebni proračuni objekata odvodnjavanja podzemnih voda. Proračunima za površinski kop Radljevo Sever je omogućeno da se dobije potreban broj bunara kako bi oni pravilno funkcionisali i obezbedili potrebno obaranje podzenih voda.
    Radljevo, ugalj, odvodnjavanje, bunari