Abstract
In this paper results of research of co-firing coals from Middle Bosnian basin with waste woody biomass are presented. Tested fuels were subjected to pulverized combustion under various temperatures and various technical and technological conditions: different mass ratio of fuel components in the mixture, different coefficient of excess air for combustion, staged air supply into the reaction zone and application of natural gas as an additional fuel (reburning technology). The results are related to the emission of flue gas components (CO2, CO, NOx and SO2) with respect to the technological conditions of combustion. In addition to the valorization of the influence of the primary fuel composition and process temperature on the emission values of the flue gas components, it has been shown that the application of primary measures in the combustion chamber results in lower or higher positive effects in terms of reducing the emissions of individual components - e.g. the NOx emission is reduced from \( 837\;{\text{mg/m}}_{\text{n}}^{3} \) in conventional combustion to \( 710\;{\text{mg/m}}_{\text{n}}^{3} \) using air staging. It is also shown that when using natural gas as additional fuel there is an additional reduction in NOx emissions, and this is proportional to the amount of natural gas - e.g. for process temperature of 1350 °C and 10% of natural gas energy share co-firing with coal, a NOx emission reduction of more than \( 250\;{\text{mg/m}}_{\text{n}}^{3} \) was recorded, compared to emissions without additional fuel.
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Acknowledgements
Part of the results presented in this paper were created during the research in the framework of the project: Advantages of co-firing of coal with waste wood biomass under the conditions of staged air supply, financed by the Ministry of Education and Science of the Federation of Bosnia and Herzegovina for 2018 and infrastructural assisted by the Faculty of Mechanical Engineering of University of Sarajevo.
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Hodzic, N., Kazagic, A., Kadic, K. (2020). Air Staging and Reburning to Achieve Low Emissions During Co-firing Coal and Biomass. In: Karabegović, I. (eds) New Technologies, Development and Application III. NT 2020. Lecture Notes in Networks and Systems, vol 128. Springer, Cham. https://doi.org/10.1007/978-3-030-46817-0_76
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DOI: https://doi.org/10.1007/978-3-030-46817-0_76
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