DYNAMIC BEHAVIOUR OF HOT WATER BOILERS DURING START UP

Abstract The most commonly used central units in the district heating system are most certainly hot water boilers. Experience in exploitation as well as their former development have given rise to new demands and possibilities of using hot water boilers for achieving a more efficient utilization of fuel. Yet, the current trend is not only for an efficient operation in terms of energy efficiency of primary fuel, but it also comprises many strict requirements when it comes to a cost-effective, reliable and safe operation. A mathematical - empirical model of the hot water boiler during the start-up process is presented in this paper. The dynamic behavior of the object will be discussed in the start-up regime because it represents one of the most critical transient regimes during the operation. References Katavić, B., Jegdić, B., 2007, Analysis of damages on water boiler shield pipes, Welding and Welded structure, 4 pp. 123-130. Brkić, Lj., Živanović, T., Tucaković, D., 2010, Steam boilers, University of Belgrade, Faculty of Mechanical Engineering, Belgrade. Todorović, M., Živković, D., Mančić, M., Ilić, G., 2013, Application of energy and exergy analysis to increase efficiency of a hot water gas fired boiler, Chem. Ind. Chem. Eng. Q., DOI:10.2298/CICEQ130716033T. Djurić, S., Milčić, D., Smiljković, M.., 2010, Overhaul of screened system in thermal smoke-tube block boiler, IMK-14 Research & Development, 36 (3) pp. 97-100. Šijački Žeravčić, V., Bakić, G., Đukić, M., Anđelić, B., 2007, Analysis of test results of hot-water boiler as a basis for its integrity assessment, Structural Integrity and life, 7 (2), pp. 133-140 Šekeljić, P., Bakić, G., 2007, Optimization of maintenance measures of piping system of the 60MW boiler in order to raise their availability, Energy-Economy-Environment, 3-4 pp. 45-49. Taler, J., Michalczyk, K., 2006, Thermal and structural stress analysis of boiler drum and central pipe connection in transient conditions, AGH University journals - Mechanics, 25 (1) pp. 41-46. Gradziel, S., 2011, Determination of temperature and thermal stresses distribution in power boiler elements with use inverse heat conduction method, Archives of Thermodynamics, 32 (3) pp. 191-200. Todorović, M., Živković, D., Mančić, M.., Milčić, D.., 2013, Analysis of dynamic behaviour of hot water boiler during start up, Proceedings of the 16th Symposium on Thermal Science and Engineering of Serbia SIMTERM 2013, Sokobanja, Srbija, pp. 86-94. Zima, W., 2011, Mathematical Modelling of Dynamics of Boiler Surface Heated Convectively, Heat Transfer - Engineering Applications, InTech, Poland. Cwinar, L., 1981, Poosk parovikh kotlov, Moskva: Enyergoizdat. Cwinar, L., 1971, Metoda okreslania warunków pracy przegrzewaczy pary podczas rozruchu kotlów walczakowych. Archiwum Budowy Maszyn, XVIII, zeszyt 2, Moskva: Enyergoizdat. Cwinar, L., 1975, Programmirovaniye pooska i ostanova kotlov (blokov), Byollyetyen? postoyannoy komissii po elyektroenyergii 9, Moskva: Enyergoizdat. Orlowski, P., 1972, Kotly parowe - konstrukcjy i obliczenia, Warszawa: WNT. Mitovski, M., Mitovski, A., 2009, Damage of pipes of utilized steam boiler furnace, Technique - Mechanical Engineering, 58 (4) pp. 9-15. Živanović, T., Stupar, G., Tucaković, D., 2013, Causes of damage on hot water boiler MIP - 6300 GF power of 6,3 MW with repair proposition, Proceedings of the 44th International Congress & Exhibition on Heating, Refrigeration and Air Conditioning, Belgrade, 4-6. XII 2013, pp. 203-214.