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. The analysis includes the following characteristics: moisture, ash, combustible matter and lower heating value. From the statistic parameters we have determined: absolute range, arithmetic mean, standard deviation and variations coefficient. It has been shown that the coal characteristics 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. Large oscilations of mass portions: W, A, V g, and H d around the mean value can adversely influence the function of a boiler plant and an electric filter plant in thermal power plants in Bosnia and Herzegovina in which the mentioned types of coal bum. Large ash oscilations (34.21%) around the mean value point out to the inability of application of dry procedures of desulphurisation of smoke gasses due to the additional quantity of ash. It has been shown that the characteristics of Bosnian types ofcoal do not deviate a lot from the characteristics ofcoal in the surrounding countries (coals of Serbia and Montenegro). The results can be used in analysis of coal combustion in thermal power plants, optimisation of electri- cal-filtre, reduction of SO 2 in smoke gas, and other practical problems.