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Open AccessArticle

Generalized Energy and Ecological Characteristics of the Process of Co-Firing Coal with Biomass in a Steam Boiler

1
Faculty of Civil Engineering, Architecture and Environmental Engineering, University of Zielona Góra, Prof. Z. Szafrana 15 St., 65-516 Zielona Góra, Poland
2
TAURON Polish Energy Inc., Ściegiennego 3 St., 40-114 Katowice, Poland
3
Faculty of Energy and Environmental Engineering, Silesian University of Technology, 44-100 Gliwice, Poland
*
Author to whom correspondence should be addressed.
Energies 2020, 13(10), 2634; https://doi.org/10.3390/en13102634
Received: 18 April 2020 / Revised: 13 May 2020 / Accepted: 15 May 2020 / Published: 21 May 2020
(This article belongs to the Special Issue Biomass Wastes for Energy Production)
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. View Full-Text
Keywords: steam boilers; co-firing; biomass; characteristics; boiler efficiency; GHG emissions; decision parameters; result parameters; structural parameters steam boilers; co-firing; biomass; characteristics; boiler efficiency; GHG emissions; decision parameters; result parameters; structural parameters
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Kozioł, J.; Czubala, J.; Kozioł, M.; Ziembicki, P. Generalized Energy and Ecological Characteristics of the Process of Co-Firing Coal with Biomass in a Steam Boiler. Energies 2020, 13, 2634.

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