LIST OF ACCEPTED PAPERS

List of accepted abstract for the Symposium

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  Mr Sanja Petrović dipl. ing, Mr Đorđina Milovanović dipl. ing, Dr Zoran Mićević dipl. ing. - Energoprojekt-Entel, Beograd, Bul. Mihaila Pupina 12

  » CARBON DIOXIDE EMISSIONS FROM THERMAL POWER PLANTS OF EPS - PREDICTIONS AND REDUCTION POSSIBILITIES

  submitted by: ZoranMicevic
  Abstract text

  Results of numerous analyses and conducted investigations have indisputably demonstrated that much talked about, on-going climate changes had been caused by anthropogenic factors, mainly by emissions of green house gasses (GHG). By far, the most significant source of GHG emissions is the sector of power generation, primarily coal fired power plants. The paper analyses emission of carbon-dioxide, as a dominant GHG, released from Serbian thermal power plants over the last 15 years and gives future emission trends in the period up to 2030, taking into account scheduled dynamics of existing thermal power plants’ operation, as well as new unit commissioning. Although Serbia, as a non-Annex I country, so far has no obligations to reduce carbon-dioxide emissions, the paper also identifies possible directions of carbon dioxide emission reduction from existing TPPs, presenting expected emission reductions until 2030.
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  Rastko Jovanović, Dejan Cvetinović, Predrag Stefanović, Zoran Marković, Zoran Pavlović - Institut za nuklearne nauke VINČA, Laboratorija za termotehniku i energetiku, Bartosz Swiatkowski - Thermal Processes Department, Institute of Power Engineering, Mory 8, 01-330 Warsaw, Poland

  » Turbulent Two-Phase Flow Modeling of Air-Coal Mixture Channels with Single Blade Turbulators

  submitted by: Dejan.Cvetinovic
  Abstract text

  Subject of this work is turbulent two-phase flow through air-coal channel(s) of complex geometry. Air flow through all eight air-coal mixture channels was simulated in first stage. Velocity and pressure field were obtained as results of this simulation. One channel was selected, based on obtained results from first case. Two-phase flow was simulated in this channel. Lagrangian multiphase model was used for discrete phase (coal particles) modeling. Two-phase flow in air-coal mixture channel without turbulator was simulated next. After that, two-phase flow in air-coal mixture channels with two different turbulator heights was simulated. Turbulators were set parallel to velocity vectors at inlet. Finally turbulators were rotated for 12 deg. around x-axis in positive mathematical direction, and simulation was repeated for both turbulator heights.

  The aim of this work is numerical optimization of fluid flow and coal particle distribution in reconstructed air-coal mixture channels. Single blade turbulator was used to increase turbulence in vertical section of air-coal mixture channel. Standard k-ω turbulent model was used for modeling turbulence. Lagrangian multiphase model was used for modeling coal particle distribution.

  More uniform coal particle distribution has been achieved using single blade turbulators. Results show that there is no significant difference in coal particle distribution between all four cases in which different turbulator geometry and position was used. Upon these conclusions, technologically simplest solution, turbulator with low height, can be suggested.

  Although better particle distribution is reached using single blade turbulators, particle concentration in evaluation section (where plasma generators will be built in) still remained anisotropic. Because uniform coal particle distribution is of great importance for proper work of plasma generators, other solutions for achieving this goal will be object of future analysis.
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  mr Goran Vučković, dr Mladen Stojiljković, dr Mića Vukić - Mašinski fakultet u Nišu, A. Medvedeva 14, 18000 Niš, Srbija

  » PRELIMINARNA ENERGETSKA REVIZIJA KORIŠĆENJA ELEKTRIČNE ENERGIJE U OSNOVNOJ ŠKOLI “JOVAN POPOVIĆ” U NOVOM SADU

  submitted by: GoranVuckovic
  Abstract text

  U ovom radu predstavljena je preliminarna energetska revizija korišćenja električne energije u osnovnoj školi “Jovan Popović“ u Novom Sadu. U tom smislu izvršeno je snimanje stanja na terenu i prikupljeni su raspoloživi podaci iz službe računovodstva škole o utrošku energije. Prikupljeni i obrađeni podaci predstavljeni su tabelarno. U zaključku rada dat je predlog mera za uštedu električne energije kod osvetljenja sa troškom implementacije i periodom povratka investicije.
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  Jasmina Vujić - Department of Nuclear Engineering University of California at Berkeley, Berkeley, California, USA , Dragoljub Antić - Vinča Institute of Nuclear Sciences Belgrade, Serbia

  » SUSTAINABLE NUCLEAR ENERGY TRENDS IN THE USA

  submitted by: JasminaVujic
  Abstract text

  At the beginning of the 21st century the world is facing considerable energy and environmental challenges. Almost one-third of the world’s population does not have access to electricity. Underdeveloped and developing countries use fossil fuels as the major source of energy today, and will continue using it in the future, unless more affordable and environment-friendly source of electricity is available. Developed countries are concerned about energy security and energy independence. It is becoming clear to many that nuclear energy must play a significant and increasing role in the world’s energy mix.

  In order for it to happen, several obstacles must be overcome, including safe disposal of spent fuel and proliferation prevention. A new US national initiative has been considered, referred to as the Global Nuclear Energy Partnership (GNEP), designed to position the United States to have international influence over the expanding global use of nuclear energy. However, some parts of this initiative have been criticized by the broader nuclear community, and the initiative is currently under the review and possible major revision. The good news is that the U.S. Department of Energy (DOE) submitted in June a license application for the Yucca Mountain spent fuel repository, and several industrial consortia are planning to construct new nuclear power plants in the US.

  Internationally, key nations of the Pacific Rim community are moving ahead aggressively with the expansion of nuclear power capabilities in order to meet growing energy demands while minimizing carbon output. These Pacific Rim nations described nuclear power expansion in terms like “to foster economic growth”, “enhance environmental quality”, “a strategic energy source” and “the backbone of economic growth”. The nuclear sector stakeholders must increase their manufacturing base, science and technology infrastructure (by modernizing facilities), and human capital (training the next generation of nuclear engineers with industrial and federal government commitment).

  Realizing the seriousness of energy and environmental situation in the nation, the directors of all ten national laboratories in the U.S. put together a position paper on “A Sustainable Energy Future: The Essential Role of Nuclear Energy,” in August 2008 for the U.S. policy makers, in which they state their joint position regarding specific near-term actions as well as a coherent long term strategy.

  In the short term, the United States needs to urgently extend the life of its existing nuclear plants, build new plants, and implement further cost improvements. An integrated approach must be employed to manage nuclear fuel and high-level waste, including interim storage, licensing of the Yucca Mountain Repository, and exploring optimal future waste management options. In the medium- and long-term, recycling of spent fuel and development of advanced fuel cycles must be aggressively pursued, together with the development of advanced Generation IV reactors. Partnering with other countries and international collaboration is highly recommended, in order to assure uninterrupted worldwide fuel supply and effective waste management, thus discouraging the spread of enrichment and reprocessing capabilities. Research and development in advanced safeguards must be emphasized. Expert and expertise must be rebuilt across industry, national laboratories and academia.
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  Mirko M. Stojiljković, Mladen M. Stojiljković, Bratislav D. Blagojević - University of Niš, Faculty of Mechanical Engineering, Regional Energy Efficiency Center Niš

  » PRIMARY ENERGY SAVINGS POTENTIAL IN OPTIMIZED SMALL SCALE COGENERATION PLANTS

  submitted by: MirkoStojiljkovic
  Abstract text

  Cogeneration systems, if properly designed and operated, save primary energy, because they have higher efficiencies than the efficiencies of separate production of electricity and heat and are usually much closer to the consumers, thus reducing the losses in transportation and distribution networks. One of the most important parameter for the evaluation of cogeneration plants is primary energy savings, defined in European Directive on the Promotion of Cogeneration. Reduction of primary energy consumption often results with lower degree of air pollution and economic benefits.

  In this paper, primary energy savings that might be achieved with the implementation of high efficiency small scale cogeneration plant are discussed. The plant is based on the natural gas-fired reciprocating engine and absorption chiller that uses heat produced by the engine to obtain the cooling energy. The estimation is based on optimized operation winter and summer regimes of the discussed cogeneration plant. The objective function is primary energy savings, i.e. primary energy consumption.
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  Bosiljka Stojanović - TE "Ugljevik" - Ugljevik, BiH, Suzana Govedarica - TE "Gacko", Gacko, BiH

  » EMISSIONS OF GREENHOUSE GASSES FROM POWER PLANTS REPUBLIC OF SRPSKA

  submitted by: BosiljkaStojanovic
  Abstract text

  Calculations of emissions direct and indirect GH-gases from energy source comprising

  CO2, CH4, N2O, NOx, NMVOC and SO2, are described in this paper. Emissions in power plants

  Ugljevik and Gacko, are calculated. Also, fugitive emissions created coal mining and handling the surface mines Ugljevik and Gacko, are calculated. All emissions are calculated arccoding to IPCC methodology for five years from 2002 to 2006.
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  Slobodan N. Vukosavić - Elektrotehnički fakultet-Beograd, Željko V.Despotović - Institut "M.Pupin"- Beograd, Božo M.Mićović, Miroljub M.Bakić - Termoelektrane „Nikola Tesla“, TENT-A, Obrenovac, Serbia

  » THE HIGH FREQUENCY SUPPLY FOR REMOVE FLY ASCH IN THE SMOKE OF THERMAL PLANTS

  submitted by: ZeljkoDespotovic
  Abstract text

  The work shows comparative synopis of 50Hz and high frequency units for electrostatic separators supply, considering their advantages and disadvantages for each one. Comparison of these two mentioned systems shows techno-economic analysis, which points out clearly that high frequency supply systems are worthwhile. After this, actual realized high voltage supply was described referring to one section within the scope of electrostatic precipitator system (two branches and two sections in each one) for fly ash removal from smoke in TPP “Morava”. In the end, first preliminary results of testing are given for realized high frequency supply which is still pending in TPP “Morava”.
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  Владан Карамарковић, Милена Ђаконовић и Анђела Лазаревић - Министарство рударства и енергетике, Краља Милана 36, 11.000 Београд

  » СТРАТЕГИЈА ПРИМЕНЕ МЕХАНИЗАМА ЧИСТОГ РАЗВОЈА НА ПРОЈЕКТЕ У СЕКТОРУ ЕНЕРГЕТИКЕ РЕПУБЛИКЕ СРБИЈЕ

  submitted by: VladanKaramarkovic
  Abstract text

  The Republic of Serbia is the signatory of the UN Framework Convention on Climate Change and the Kyoto Protocol and it belongs to the group of Non-Annex I developing countries which do not have the obligation to reduce the GHG emission during the Kyoto Period (2008-2012) and with a possibility to use one of the flexible mechanisms of the Kyoto Protocol, the Clean Development Mechanism. Since the EU defined a new obligatory period for its members (2012 – 2020), the paperwork defines the potentials of our country for the implementation of the CDM projects. The projects will be unilateral so as to comply with our future obligations after 2012 for three different scenarios for GHG reduction.
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  Simeon Oka, Emilija Turković, Predrag Stefanović, Maja Đurović-Petrović - Matični naučni odbor za energetsku efikasnost Ministarstva nauke i tehnološkog razvoja Republike Srbije

  » DOPRINOS NACIONALNOG PROGRAMA ENERGETSKE EFIKASNOSTI EFIKASNOM RADU ELEKTROENERGETSKOG SISTEMA SRBIJE

  submitted by: Dejan.Cvetinovic
  Abstract text

  Elektroenergetski sistem Srbije je jedan od najvećih, ako ne i najveći, i tehnološki najrazvijeniji tehnički sistem u Srbiji. U pogonu je 8 termoelektrana sa 25 blokova koje kao pogonsko gorivo koriste lignit (Nikola Tesla A 6, Nikola Tesla B 2, Kolubara 5 i Morava sa jednim blokom, zatim Kostolac A 2 i Kostolac B 2, i konačno Kosovo A 5 i B 2 bloka) i devet hidroelektrana sa pedeset hidro-agregata (Đerdap I 6, Đerdap II 10 agregata, Pirot 2, Vlasina 10, Bajina Bašta 4, RHE Bajina Bašta 2, Limske HE 8, Zvornik 4 i Elektromorava 4 agregata).

  Ukupna instalirana snaga elektroenergetskih izvora je 7120 MW (3936MW u TE na lignit, 2.831 MW u HE i 353 MW u TE-TO na mazut i prirodni gas), bez termoelektrana na teritoriji Kosova i Metohije (1235 MW), koje trenutno ne rade u sastavu elektroenergetskog sistema Srbije. Sistem za prenos električne energije čini oko 10.200 km dalekovoda 400, 220 i 110 kV i oko 27 GVA instaliranih u transformatorskim stanicama, preko koga se vrši prenos električne energije proizvedene u zemlji i obavlja razmena sa susednim sistemima. Sistem za distribuciju električne energije ima mrežu dužine preko 150.000 km sa 34,318 transformatorskih stanica.

  Iako je učešće instaliranog kapaciteta hidroelektrana skoro 40%, proizvodnja električne energije u termoelektranama je značajno veća. U 2007 godini u elektranama EPS-a je proizvedeno 38.897 GWh električne energije. Učešće termoelektrana u proizvodnji iznosilo je 73.20%. Na površinskim kopovima u kolubarskom i kostolačkom basenu povećana je proizvodnja na 36.506.746 tona lignita, od čega u površinskom kopu Kolubara oko 80%. Sa stanovišta proizvodnje električne energije u sistemu, proizvodnja mrkog i kamenog uglja u malim rudnicima je zanemarljiva, oko 550.000 t (ili oko 1,5%) [EPS-sait, Strategija 2015, Program ostvarivanja strategije]. Potrošačima u Srbiji je prodato 2007 godine 28.749 GWh električne energije.
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  Predrag M. Živković, Mića V. Vukić, Mirjana S. Laković - Mašinski fakultet Niš, ul. A. Medvedeva 14, 18000 Niš, Žarko M. Stevanović, Žana Ž. Stevanović - Institut za nuklearne nauke VINČA, Laboratorija za termotehniku i energetiku

  » WIND ATLAS OF SOUTHERN AND EASTERN SERBIA

  submitted by: zarestevanovic
  Abstract text

  In this paper Wind Atlas of Southern and Eastern Serbia is presented. It implies the determination of the best possible locations for siting of wind turbines, with the final goal of making the wind atlas of entire Serbia. In this phase, twelve mezzo models, including the test model of Seličevica are considered, which covers the mentioned areas. The simulations are mostly performed using the WasP [4] simulation software, considering the experience in dealing with the software packages available. Results shown considers the type of wind turbine, Annual Energy Production (AEP), load factor, static and dynamic economical criteria.