One of the ways used to reduce the emission of carbon dioxide and other harmful substances is the implementation of biomass co-firing processes with coals. Such processes have been implemented for many years throughout many countries of the world, and have included using existing high-power coal boilers. Despite numerous experiments, there are still no analyses in the literature allowing for their generalization. The purpose of this paper is to determine the generalized energy and ecological characteristics of dust steam boilers co-firing hard coal with biomass. The energy characteristics determined in the paper are the dependence of the gross energy efficiency of boilers on such decision parameters as their efficiency and the share of biomass chemical energy in fuel. However, the ecological characteristics are the dependence of emission streams: CO, NOx, SO2, and dust on the same decision parameters. From a mathematical point of view, the characteristics are approximation functions between the efficiency values obtained from the measurements and the emission streams of the analysed harmful substances and the corresponding values of the decision parameters. Second-degree polynomials are assumed in this paper as approximation functions. Therefore, determining the characteristics came down to determining the constant coefficients occurring in these polynomials, the so-called structural parameters. The fit of the determined characteristics was assessed based on the coefficients of random variation and the test of estimated significance of structural parameters. Boiler characteristics can be used when forecasting the impact of changes in operating conditions on the effects achieved in existing, modernized, and designed boilers. The generalization of the characteristics was obtained from the measurement results presented in 10 independent sources used to determine them.

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This paper presents the method of setting the maximal accepted cost of waste fuel burned in heat industry power plant with the regard of trading effects of CO 2 allowances. In effected analysis, the entrance parameters are specified by the uncertain (heuristic) data or by probabilistic data (trough statistical distributions of given parameters). The research has accomplished for industrial power plant using waste gases from steelworks. The method proposed in this paper has been illustrated in 5-years period perspective of power plant operating. Economical effect was described as an object function, expressed as net present value (NPV).Keywords: maximal accepted cost, CO 2 emissions, uncertain data, probabilistic data, waste gases W pracy przedstawiono metodę wyznaczania granicznego kosztu paliw odpadowych spalanych w elektrociepłowni przemysłowej, uwzględniającą skutki handlu uprawnieniami do emisji CO 2 . Parametry wejściowe w przeprowadzonej analizie określone są przez dane o charakterze niepewnym (heurystycznym) lub probabilistycznym (przez rozkłady statystyczne rozpatrywanych parametrów). Badania zostały przeprowadzone dla elektrociepłowni przemysłowej, wykorzystującej odpadowe gazy palne z zakładu hutniczego. Zaproponowaną metodę zilustrowano w perspektywie 5-letniego okresu eksploatacji elektrociepłowni. Efekt ekonomiczny został opisany za pomocą funkcji celu, wyrażonej przez wartość bieżącą netto (NPV).