QUALITATIVE ANALYSIS OF COAL COMBUSTED IN BOILERS OF THE THERMAL POWER PLANTS IN BOSNIA AND HERZEGOVINA

Abstract

In this paper we have looked into the qualitative analysis of coals in Bosnia and Herzegovina (B-H). The analysis includes the following characteristics: moisture (W), ash (A), combustible matter (Vg) and lower heating value (Hd). From the statistic parameters we have determined: absolute range (R), arithmetic mean ( X ), standard deviation (S) and variations coefficient (Cv). It has been shown that the coal characteristics (W, A, Vg, Hd) have normal distribution. The analysis show that there are considerable deviations of ash characteristics: moisture (36.23%), ash (34.21%), combustible matter (16.15%) and lower heating value (25.16%) from the mean value which is shown by the variations coefficient (Cv). Large oscilations of mass portions: W, A, Vg and Hd around the mean value can dversely influence the function of a boiler plant and an electric filter plant in thermal power plants in B-H in which the mentioned types of coal burn. Large ash oscilations (34.21%) around the mean value point out to the inability of application of dry procedures of desulphurisation of smoke gasses (FGD) due to the additional quantity of ash. It has been shown that the characteristics of Bosnian types of coal do not deviate a lot from the characteristics of coal in the surrounding countries (coals of Serbia and Monte Negro). The results can be used in analysis of coal combustion in thermal power plants, optimisation of electrical-filtre, reduction of SO2 in smoke gas and other practical problems.

Keywords

Dates

  • Submission Date2011-06-12
  • Revision Date2012-01-06
  • Acceptance Date2012-01-20

DOI Reference

10.2298/TSCI110612027D

References

  1. Jäger, G., Theis, A.K., Kraftwerkstechnologien für die zukünftige Stromerzeugung, VGB PowerTech 7 (2003), pp. 27-31
  2. UN, Economic Commission for Europe, Committee on Sustainable Energy: Global and Regional Coal Demand Perspectives to 2030 and Beyond (Prepared by Klaus Rendow,World Energy Council), Ad Hoc Group of Experts on Coal Sustainable Development, Sixth Session, 17-18 November, 2003
  3. Smajević, I., Prospect of coal based electricity production in Bosnia and Herzegovina Mechanical Engineering, 2 (2004), 8, pp. 95-108
  4. Čobanovič, Đ., et al., Sampling, measurement and laboratory examination report on waste materia emissions into the air. Coal, slag and ash analysis, System Qualita, Pale - Institute of Mining, Zemun, Belgrade, Coal mining and Thermal Power Plant, Gacko, Bosnia and Herzegovina, 2007
  5. Lazarević, V., Lončar, S., Mesarović, M., Equalizing the Quality of Coal for Thermal Power Plants, Thermotechnics, 33 (2007), 1-4, pp. 13-19
  6. Kazagić, A., Smajević, I., Duić, N., Selection of sustainable technologies for combustion of Bosnian coals, Thermal Science, 14 (2010), 3, pp. 715-727
  7. Bogner, M., Thermotechnician 1., SMEITS, Beograd, 2004
  8. Knežević, A., et al., A study of environmental impact power plants Stanari 420 MW, Sarajevo, 2007
  9. Jenkins, R.G., Walker, P.L., Analytical Methods for Coal and Coal Products, Academic Press, New York, 1978
  10. Horea, N., Dorel, C., Gavril, N., The distribution of inorganic elements between coal and Mineral matter in Rumanian lignite, Fuel, 74 (1995), 1, pp. 119-123
  11. Shao.J., Mathematical Statistics, Second Edition, Springer-Verlag, New York, 2010
  12. Đurić, S., Influence of Coal Characteristics (Sulphur and Ash Mass Contents and Ash Composition) and Temperature on Dry FGD, M. Sc. thesis, Faculty of Mechanical Engineering, University of Belgrade, Belgrade, 1998
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