LIST OF ACCEPTED PAPERS

List of accepted abstract for the Symposium

• show abstract

  Nikola V. Živković, Predrag Lj. Stefanović, Dejan B. Cvetinović - Institut za nuklearne nauke VINČA, Laboratorija za termotehniku i energetiku

  » COAL POWDER MASS FLOW DISTRIBUTION IN THE MIXTURE CHANNEL PRESENTED BY NUMERICAL SIMULATION

  submitted by: NikolaZivkovic
  Abstract text

  One of the key operational requirements for thermal power plant boiler is to achieve adequate mass flow of coal particles in the sections of the mixture channel and the burner channels. The requirement is invariant, whether classic technology (with black mineral oil) or plasma technology for fire stabilization is used. In order to adequately direct coal particles, the shutter system is positioned in the mixture channel. Each of the shutter groups have its own proposition and can be positioned in various angular positions. The results present influence of each of the shutter groups on coal powder mass flow distribution in the mixture channel on thermal power plant „Nikola Tesla” – A1. The results are obtained by numerical simulation. Input data in numerical calculations, such as velocity and concentration profiles in the inlet cross section were uniform. The results include coal powder mass flow distribution in each of eight sections and mass flow distribution in the left and right part of the mixture channel.
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  П. Радовановић, А. Mazurkiewicz - Institut za nuklearne nauke VINČA, Laboratorija za termotehniku i energetiku, М. Милић, Б. Перковић - Termoelektrane „Nikola Tesla“, TENT-A, Obrenovac, Serbia

  » POSSIBILITIES AND PRECAUTIONS FOR THE ENLARGED STEAM PRODUCTION IN THE B2 BOILER AT TPP NIKOLA TESLA, OBRENOVAC, SERBIA

  submitted by: PredragRadovanovic
  Abstract text

  Након обављеног капиталног ремонта блока током којег су извршени одговарајући реконструктивни захвати, септембра 2008. године обављена су испитивања и подешавања блока Б2 у ТЕ „Никола Тесла“ за рад са повећаном снагом блока – са досадашњих номиналних 620 на 667,5 МW. Реконструкција је изведена претежно на турбинском постројењу, док су на котловском постројењу као најважнији захват извршена одговарајућа прилагођавања ложних уређаја у циљу реорганизовања процеса сагоревања како би се обезбедила повећана номинална производња паре - са досадашњих 1880 на око 2000 t/h.

  Иначе, блок ТЕНТ-Б2 пуштен је у рад крајем 1985. године; до повећања номиналне снаге остварио је око 165000 часова рада на мрежи и (на генератору) произвео око 85000 GWh електричне енергије.

  У овом раду изнети су прорачунски и испитивањима утврђени технички услови и могућности котловског постројења за повећану производњу свеже паре, као и утицај нове организације сагоревања у ложишту котла на смањење емисије азотних оксида.

  POSSIBILITIES AND PRECAUTIONS FOR THE ENLARGED STEAM PRODUCTION IN THE B2 BOILER AT TPP NIKOLA TESLA, OBRENOVAC, SERBIA

  Abstract

  In this paper, results both of the calculations and at the site testing of possibilities for the enlarged steam production in the B2 boiler at TPP Nikola Tesla, Obrenovac, Serbia are discussed.

  This spring, during the regular annual overhaul period, the respective reconstruction of B2 turbine was made in order to enlarge the nominal power of the unit for 50 MWe. At the same time, the firing system of the boiler was adjusted in order to obtain 150 tons per hour more steam.

  This 620 MWe unit (now 670 MWe) fired with low quality lignite is in operation since the end of 1985, with more than 165000 operating hours and electricity production of 85000 GWh.
• show abstract

  Misa Jocic - PIPETECH Jocic

  » SATISFYING PIPING STRESS AND FLEXIBILITY REQUIREMENTS WITH THE IMPLEMENTATION OF EXPANSION JOINTS (TECHNO-ECONOMICAL OPTIMISATION) - ZADOVOLJAVANJE ZAHTEVA ZA NAPREZANJEM I FLEKSIBILNOŠĆU CEVOVODA PRIMENOM DILATACIONIH KOMPENZATORA (TEHNO-EKONOMSK

  submitted by: misa
  Abstract text

  There have been various attempts to deal with the optimization of solutions which involve expansion joints in piping systems where sufficient flexibility can’t be found using suitable pipe routing.

  The difficulty of piping designs which involve expansion joints is that they rely upon two engineering expertises: Pipe Flexibility and Stress Analysis on one side and Expansion Joint Design and Construction on the other. Arguably distinctively different, they have been looked upon as totally separate engineering disciplines and it is rarely that companies have two of these experts sitting under the same roof. Pipe Stress Engineers basically relied on the support form Expansion Joint Experts on “as required basis” and called upon their knowledge only when needed. Thus, we have the situation where knowledge related to the design and construction of expansion joints sits with expansion joints manufacturing companies, which are totally separate and often remote entities in the design process.

  Even so, the ever present demand for techno-economical optimizations, now days direct us towards the following observations.

  The “Traditional method”, where Pipe Stress Engineer defines on his own the requirements for expansion joints and describes them in the technical specification for purchasing is, or should be, a matter of past.

  This approach may be used only as a first attempt at finding the solution, but given that it never heads in the direction of achieving optimal techno-economical results, needs to be upgraded with additional steps.

  Bilo je mnogih pokušaja za savladavanje optimizacije rešenja s dilatacionim kompenzatorima u cevovodnim sistemima kod kojih se, uz primenu prikladnog vođenja cevi, ne može ostvariti zadovoljavajuća fleksibilnost cevovoda. Problem pri projektovanju cevododa koji uključuju dilatacione kompenzatore je u tome što se zahtevaju dve inženjerske ekspertize: analize fleksibilnosti i naprezanja cevovoda s jedne te projektovanja i konstrukcije dilatacionih kompenzatora s druge strane. Kako su uverljivo prilično različite, na njih se gledalo kao na potpuno odvojene discipline i retke su firme koje imaju dva takva stručnjaka pod istim krovom. Inženjeri koji se bave naprezanjem cevovoda u osnovi se oslanjaju na podršku stručnjaka za dilatacione kompenzatore na 'regularnoj bazi' i koriste njihovo znanje samo kada je potrebno. Tako postoji situacija da se znanje koje se odnosi na projektovanje i konstrukciju dilatacionih kompenzatora nalazi iskljucivo kod proizvođače te opreme, a to su sasvim odvojeni i često udaljeni cinioci procesa projektovanja cevovodnih sistema. Medjutim bez obzira na to, danas uvek prisutni zahtevi za tehno-ekonomskim optimiziranjem, usmeravaju na sljedeća razmatranja.

  'Tradicionalna metoda', kod koje inženjer koji se bavi naprezanjem cevovoda određuje svoje sopstvene zahteve i opisuje ih u tehničkim specifikacijama za nabavu dilatacionih kompenzatora, jeste ili bi trebalo biti stvar prošlosti.

  Danas se takav pristup može koristiti samo kao prvi pokušaj u pronalaženju rešenja, ali ako se uzme u obzir da nikada ne vodi prema optimalnim tehno-ekonomskim rezultatima, treba biti nadograđen dodatnim koracima.
• show abstract

  Dr Zoran Mićević, dipl.ing. - Energoprojekt – ENTEL, Beograd

  » ADAPTACIJA I SANACIJA ELEKTROFILTARSKIH POSTROJENJA U TERMOELEKTRANAMA EPS

  submitted by: ZoranMicevic
  Abstract text

  U poslednjih nekoliko godina ENERGOPROJEKT je realizovao dva značajna projekta rekonstrukcije elektrofiltarskih postrojenja u TE „Nikola Tesla A” (na Blokovima A1 i A4), u planu je rekonstrukcija ovog postrojenja na Bloku A6, a trenutno se realizuje projekat rekonstrukcije elektrofiltarskog postrojenja u TE „Kolubara A”. Realizacija ovih projekata, iniciranih od strane EPS-a, koji predstavljaju veoma važan doprinos unapređenju zaštite životne sredine u skladu sa zahtevima regulative Evropske Unije i održivom razvoju u Srbiji, poverena je ENERGOPROJEKTU, kao sistem integratoru domaće privrede i znanja. Posao je realizovan sredstvima Elektroprivrede Srbije, a za glavnog izvođača radova angažovan je ENERGOPROJEKT, odnosno dva njegova preduzeća, Oprema i ENTEL. Osnovni zadatak, saglasno ugovoru, bio je koordinacija i vođenje projekta, odnosno planiranje, organizovanje i praćenje realizacije projekta, ugovorna i finansijsaka administracija, inženjering i koordinacija svih učesnika (podizvođača), izrada projektne dokumentacije, ispitivanje i puštanje u rad.

  U realizaciji navedenih projekata ENERGOPROJEKT je, kroz upravljanje njihovom realizacijom, dokazao da može investitoru da obezbedi konkurentnu cenu, dogovoreni kvalitet i pre svega poštovanje dogovorenih rokova.

  Predmet ove prezentacije biće prikaz toka realizacije projekata, osnovnih podataka o učesnicima na projektu, specifikaciji radova, rokovima, cenama sprovedenih zahvata, tehničkim karakteristikama pre i posle obavljenih rekonstrukcija, kao i stečenim iskustvima ENERGOPROJEKTA.
• show abstract

  Milada Pezo - Institut za nuklearne nauke VINČA, Laboratorija za termotehniku i energetiku, Vlada Stevanović - Mašinski fakultet, Univerziteta u Beogradu

  » NUMERICAL SIMULATION OF POOL BOILING PROCESS

  submitted by: MiladaPezo
  Abstract text

  Predictions of nucleate boiling mechanisms and burnout conditions are very important in thermal-hydraulic safety analyses in steam generators. Mathematical modelling and numerical simulation of these phenomena require a treatment of vapour-liquid two-phase mixture on the macro level, as well as on the micro level, such as bubble rise and departure at the heating surface. A mathematical model of pool boiling was developed in this paper, with water-steam as coolant. Three-dimensional two-phase flow is modelled by the two fluid model. Interface transfer processes are calculated by the closure laws. Numerical experiments have been performed under high heat fluxes, which lead to the boiling crisis. Boiling crisis occurs when the heated surface is covered with vapour bubbles, and these bubbles form a barrier that hinders the replenishment of the heated wall by the pool water. Under these conditions the wall dryout occurs. The thermal transient behaviour of the heated wall is also the subject of this paper. A large increase of the wall temperature is predicted in case of dryout occurrence.
• show abstract

  I. Popović, M. Zlatanović - Faculty of Electrical Engineering University of Belgrade , Z. Gršić - Institute of Nuclear Sciences "Vinča"

  » PERFORMANCE OF SENSORS MOUNTED ON ISOLATED AND GRID CONNECTED WIND MAST

  submitted by: bata
  Abstract text

  First and second-generation cup anemometers for wind speed measurements as well as non-mechanical anemometers like hot-wire anemometers were comparatively field-tested. The sensors for wind speed and direction measurement were mounted onto two 36m tall telecommunication towers, one 40m and one 50m wind mast, located in the same-targeted area. The measurements data taken from different sets of sensors placed on wind masts located on different terrain configurations provides us with the complete set of information for use in our analysis. Our analyses have shown that sensor characteristics are strongly influencing wind speed and wind direction measurements and that non-mechanical anemometers are less sensitive to icing and more accurate and reliable. Therefore, in application dependant on accurate and reliable data measurement, usage of more sophisticated measuring methods is recommended.
• show abstract

  Krzysztof Burek - RAFAKO, Poland

  » New investments and challenges in European power sector

  submitted by: K.Burek
  Abstract text

  The paper will cover following issues and topics:

  1) Key issues considered by investors in energy sector facing a rising increase of projects:

  a) General development plan of the sector and forecasted economic trends

  b) Development of the infrastructure elements

  c) Available technologies and feasibility study for the planned investment

  d) Required approvals and permissions

  e) Financing

  f) Need of the investors in the power sector versus available capacities of suppliers in Europe

  g) Formal start of the tender procedure

  2) Challenges for Suppliers facing energy sector investment plan

  a) Access to Best Available Technology

  b) Increase of manufacturing and engineering capacities

  c) Consolidation of suppliers

  d) New partners and subsuppliers chain

  e) Standardisation of the technical solutions

  3) Endangered and sensible areas related to the big demand for the new equipment in power sector:

  a) Engineering

  b) Raw material supply

  c) Manufacturing capacities

  d) Construction and on-site service capacities

  e) Project management

  The paper will be presented in a form of Power Point Presentation.
• show abstract

  prof. dr Dragan Ignjatović, doc. dr Predrag Jovančić - Rudarsko geološki fakultet, Beograd, prof. dr Taško Maneski - Mašinski fakultet, Beograd, prof. dr Borislav Jeftenić - Elektrotehnički fakultet, Beograd

  » OPTIMIZATION OF DRIVES AND STRUCTURAL COMPONENTS OF HAULAGE SYSTEMS AT OPEN PITS DURING THEIR REVITALIZATION AND MODERNIZATION

  submitted by: DraganIgnjatovic
  Abstract text

  Project TR6648, which is defined within Technological development program of Ministry of Science, Republic of Serbia, analyzed and processed optimization of drives and structural components of haulage systems at the open pits during their revitalization and modernization. Technical solutions for optimized structure of drive and non-drive pulleys, as improved existing product (described in project "Redesign and unification of pulleys at haulage systems of Drmno open pit), were proposed according to results of this Project. Also, optimizations of conveyor belts were performed by introduction of application of regulated non-synchronous electric motor with frequency converters at Drmno open pit. Both solutions are already applied, acheiving planned results.

  OPTIMIZACIJA POGONA I KONSTRUKCIONIH ELEMENATA TRANSPORTNIH SISTEMA NA POVRŠINSKIM KOPOVIMA KOD NJIHOVE REVITALIZACIJE I MODERNIZACIJE

  Apstrakt: Projekat TR6648 koji je definisan u okviru Tehnološkog razvoja pri Ministarstvu nauke Republike Srbije, analizirao je i obradio optimizaciju pogona i konstrukcionih elemenata transportnih sistema na površinskim kopovima kod njihove revitalizacije i modernizacije. Na osnovu ovog projekta data su tehnička rešenja optimizirane konstrukcije pogonskog i nepogonskog bubnja kao poboljšani postojeći proizvod (nastao kao rezultat rada projekta ’’Redizajniranje i unifikacija bubnjeva na transportnim sistemima PK ’’Drmno’’). Takođe je izvršena i optimizacija tračnih transportera uvođenjem regulisanih asinhronih pogona sa frekventnim pretvaračima na PK ’’Drmno’’. Oba rešenja su implementirana i već donose planirane rezultate.
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  Mr Oswald Hihn - Voith Turbo GmbH & KG, Crailsheim, Germany

  » Energy Conservation Strategy for Thermal Power Plants by using Voith Variable Speed Drives / Strategija za uštedu energije u termoelektranama koristeći Voith hidrodinamičku spojnicu sa promenljivim punjenjem

  submitted by: aleksandar.kovacevic
  Abstract text

  Technology advances. Plants which originally were efficient may today be uneconomic. Voith Turbo has experience for decades in hydrodynamic power transmission and offer full engineering from one source: advice, design, commissioning and world-wide after-sales-service.

  In practice the requirements for which a unit was originally designed change within the course of time. When this occurs it can produce technical problems which are so complex that the only reasonable solution is the retrofit of the unit. Voith analyses the problem, weather it is a thermal overload or unforeseen vibrations or control difficulties. Then on the basis of this analysis, Voith works out remedial proposals.

  Analysis, diagnosis and improvement measures, such as speed adaptation by exchanging gear stages under observation of the laws of hydrodynamics, increase the economy of the existing plant.

  Usled tehnološkog razvoja elektrane koje su u vreme projektovanja imale zadovoljavajuću efikasnost danas mogu biti neekonomične. Voith Turbo ima dugogodišnje iskustvo kada su u pitanju hidrodinamički prenosnici snage i s tim u vezi može ponuditi sve, od savetovanja, projektovanja, nadzora pri puštanju u rad i u svetu razgranatu servisnu mrežu. U praksi se zahtevi za rad mašine, prvobitno projektiovane za odredjene uslove rada, menjaju tokom vremena. U slučaju kada se ovo desi jedino rešenje je retrofit/optimizacija mašine jer u protivnom dolazi do raznih tehničkih problema. Voith analizira problematiku, da li su u pitanju termičko preopterećenje, nepredvidjene vibracije ili problem upravljanja mašinom. Na bazi rezultata dobijenih analizom, Voith daje predlog za rešenje novonastale situacije. Analiza, dijagnoza i mere za poboljšanje, kao što je adaptacija broja obrtaja promenom reduktorskog stepena a vodeći računa o zakonima hidrodinamike, dovode do povećanja efikasnosti postojeće elektrane.
• show abstract

  V. Turanjanin, V. Bakić - Institut za nuklearne nauke VINČA, Laboratorija za termotehniku i energetiku, N. Miloradović - PUC „Beogradske elektrane“, Savski nasip bb, 11070 Beograd, Srbija, B. Vučićević, M. Jovanović, M. Petrović - Institut za nuklearne nauke VINČA, Laboratorija za termotehniku i energetiku

  » SIMULATION OF COMBINED SYSTEM FOR WATER HEATING

  submitted by: ValentinaTuranjanin
  Abstract text

  A dynamic simulation was done for DHW production in the summer operating period. The

  main objective of this paper was to evaluate projects energy benefits of the large-scale solar heating

  connection to district heating system, for fossil fuels substitution of the hot water production for

  domestic use during the summer period. Hot water for district heating and domestic use produces in

  heating plant “Cerak” in Belgrade. The heating plant is placed at the suburb of the Belgrade and

  supplying one settlement with hot water only during the summer period. There is exists production

  and distribution system based on fossil fuel energy, mainly of the natural gas. In the first phase of

  the project it was planned to install about 5000 m2 of solar collectors.