THERMAL SCIENCE
International Scientific Journal
CRITERIA SELECTION FOR THE ASSESSMENT OF SERBIAN LIGNITES TENDENCY TO FORM DEPOSITS ON POWER BOILERS HEAT TRANSFER SURFACES
ABSTRACT
Based on investigations of ash deposit formation, semi-empirical indicators for slagging and fouling, based on ash chemical composition and its fusion temperature, have been determined. These criteria-indicators, in suggested limits, describe the coals on which they are based (North-American and British) well. However, the experience in the thermal power production sector of Serbia shows that their literal application to domestic coals does not produce satisfactory results. This contribution provides an analysis of applicability and the choice of criteria that are suitable for Serbian coals. The focus of the contribution is on coal slagging indicators, since slagging has much heavier consequences on heat transfer inside the steam boiler, and on boiler operation as a whole. The basis for the analysis of chosen criteria comprises of the results of investigations of four coal fields - Kostolac, Kolubara, Kosovo (Serbia), and Ugljevik (Bosnia and Herzegovina).
KEYWORDS
PAPER SUBMITTED: 2009-04-06
PAPER REVISED: 2009-10-13
PAPER ACCEPTED: 2009-10-17
THERMAL SCIENCE YEAR
2009, VOLUME
13, ISSUE
Issue 4, PAGES [61 - 78]
- Radovanovic, M., Fuels (in Serbian), Faculty of Mechanical Engineering, University of Belgrade, Belgrade, 1994
- Winegartner, E. C., Coal Fouling and Slagging Parameters. ASME Research Committee on Corosion and Deposits from Combustion Gases, ASME, 1974
- Raask, E., Mineral Impurities in Coal Combustion, Behavior, Problems and Remedial Measures, Hemisphere Publishing Corporation, New York, USA, 1985
- Joseph, G. S., Properties of Coal Ash, in: Combustion Fossil Power Systems, Combustion Engineering Inc, Windsor, Conn., USA, 1981, Chapter 3, pp. 3-33
- Couch, G., Understanding and Fouling in PF Combustion, IEA Coal Research; IEACR/72, London, 1994
- Bryers, R. W., Fireside Slagging, Fouling, and High-Temperature Corrosion of Heat-Transfer Surface Due to Impurities in Steam-Raising Fuels, Prog. Energy Combust. Sci., 22 (1996), 1, pp.29-120
- Afgan, N., Arsic, B., Jovanovic, Lj., Comparative Analysis of Slagging Characteristics of Domestic Coals (in Serbian), Termotehnika, 4 (1978), 2, pp. 90-99
- Jovanovic, Lj., Fouling and Cleaning of Boiler Heat Transfer Surfaces (in Serbian), Monograph, Boris Kidri~ Institute of Nuclear Sciences, Vin~a, Belgrade, 1975
- ***, Fouling and Corrosion in Steam Generators (eds. acad. D. Savic, I. Opik), Boris Kidri~ Institute of Nuclear Sciences - Vin~a and Technical University, Belgrade, Tallinn, 1980
- Savic, D., et al., Investigation of Tendencies of the Lignites from the Kolubara, Kostolac and Kosovo Basins towards Formation of Deposits on Heat Transfer Surfaces During Combustion in Boiler Furnaces, Extrait du Bulletin T. LXV de l' Academie Serbe des Sciences et des Arts, Classe des Sciences Techniques No. 15, Belgrade, 1979
- Repic, B., Arsic, B., Jovanovic, Lj., Analysis of Boiler Furnace VU-40 State from the Aspect of Boiler Heat Transfer Surface Slagging (in Serbian), Study, IBK-ITE-704, Boris Kidri~ Institute of Nuclear Sciences, Vin~a, Belgrade, 1988
- Oka, S., Jovanovic, Lj., Experimental Testing of Ash Sticking on Screen Tubes of Utility Boilers of Large Power (in Serbian), Monograph, IBK-1235, Boris Kidri~ Institute of Nuclear Sciences, Vin~a, Belgrade, 1974
- Repic, B., Kinetics of Ash Deposit Formation on Convection-Radiation Heat Transfer Surfaces in Boiler Furnaces Using Pulverized Coal (in Serbian), Master thesis, Faculty of Mechanical Engineering, University of Belgrade, 1979
- Arsic, B., Repic, B., Jovanovic, Lj., Analysis of Coal Samples from Open Cast Mine "Bogutovo Selo" which is used in TPP Ugljevik (in Serbian), Boris Kidri~ Institute of Nuclear Sciences, Vin~a, Belgrade, 1987
- Repic, B., et al., Investigation of Rate of Ash Deposit Formation on Heat Transfer Surfaces of Boilers, Industrial Furnaces and Boilers, Volume 1 (Eds. W. Leuckel, R. Colin, J. Ward, A. Reis), ISBN 972-8034-02-4, Rio Tinto, Portugal, 1995, pp. 229-237
- Oka, S., Kostic, M., Repic, B., An Experimental Furnace for Investigation of Combustion and Ash Deposit Processes of Pulverized Coals, in the book "Fouling and Corrosion In Steam Generators" (Eds. D. Savic, I. Opik), Institute of Nuclear Sciences Boris Kidri~ -Vin~a and Technical University, Tallinn, Belgrade, 1980, pp. 135-145
- Arsic, B., et al., Complex Investigation of the Open Cast Mine "Ugljevik-East" (in Serbian), Study, IBK-ITE -646, Boris Kidri~ Institute of Nuclear Sciences, Vin~a, Belgrade, 1987
- Afgan, N., et al., Study on Ash Sticking on Heat Transfer Surfaces of a Steam Boiler for Coals From Open Cast Mines Kolubara, Kosovo and Kostolac ( in Serbian), Study, IBK-LTFT-78, Boris Kidri~ Institute of Nuclear Sciences, Vin~a, Belgrade, 1977
- Repic, B., Jovanovic, Lj., Martinovic, M., Possible Criteria for Determination of Quality and Combustion Efficiency of Domestic Coals (in Serbian), Termotehnika, XXI (1995), 3, pp.181-190
- Radovanovic, P. M., Contribution to Studying of the Influence of Ash Deposit Formation on Boiler Heat Transfer Surface Efficiency, for the Purposes of Developing a Corresponding Expert System (in Serbian), Ph. D. thesis, Banjaluka, 1994
- Mladenovic, M., Choice of Criteria for the Assessment of Tendency of Domestic Lignites Towards Deposit Formation on Power Boilers Heat Transfer Surfaces (in Serbian), Master thesis, Mechanical Engineering Faculty, University of Belgrade, Belgrade, 2005
- ***, Annual Report of the Electric Power Industry of Serbia (EPS), 2005, available online at www.eps.rs
