TY - JOUR
TI - Lab-scale investigation of Middle-Bosnia coals to achieve high-efficient and clean combustion technology
AU - Smajević Izet
AU - Hodžić Nihad
AU - Kazagić Anes
JN - Thermal Science
PY - 2014
VL - 18
IS - 3
SP - 875
EP - 888
PT - Article
AB - This paper describes full lab-scale investigation of Middle-Bosnia coals  launched to support selection an appropriate combustion technology and to  support optimization of the boiler design. Tested mix of Middle-Bosnia brown  coals is projected coal for new co-generation power plant Kakanj Unit 8  (300-450 MWe), EP B&H electricity utility. The basic coal blend consisting of  the coals Kakanj: Breza: Zenica at approximate mass ratio of 70:20:10 is low  grade brown coal with very high percentage of ash - over 40%. Testing that  coal in circulated fluidized bed combustion technique, performed at  Ruhr-University Bohum and Doosan Lentjes GmbH, has shown its inconveniency  for fluidized bed combustion technology, primarily due to the agglomeration  problems. Tests of these coals in PFC (pulverized fuel combustion) technology  have been performed in referent laboratory at Faculty of Mechanical  Engineering of Sarajevo University, on a lab-scale PFC furnace, to provide  reliable data for further analysis. The PFC tests results are fitted well  with previously obtained results of the burning similar Bosnian coal blends  in the PFC dry bottom furnace technique. Combination of the coals shares, the  process temperature and the air combustion distribution for the lowest NOx  and SO2 emissions was found in this work, provided that combustion efficiency  and CO emissions are within very strict criteria, considering specific  settlement of lab-scale furnace. Sustainability assessment based on  calculation economic and environmental indicators, in combination with Low  Cost Planning method, is used for optimization the power plant design. The  results of the full lab-scale investigation will help in selection optimal  Boiler design, to achieve sustainable energy system with high-efficient and  clean combustion technology applied for given coals.