Abstract
In this work results of laboratory research of co-firing coals from Middle Bosnian basin with waste woody biomass are presented. Pulverized combustion under various temperatures and various technical and technological conditions is performed using previously formed fuel test matrix. This is primarily related to the different mass ratio of fuel components in the mixture, the overall coefficient of excess air and the application of different primary measures in the combustion chamber. The results and analysis of the emissions of components of the flue gases are presented and discussed, which are predominantly related to the emission of CO2, CO, NOx and SO2. In addition to determining the impact of fuel composition and process temperature on the values of the emissions of components of the flue gas, it is shown that other primary measures in the combustion chamber are resulting in more or less positive effects in terms of reducing emissions of certain components of the flue gases into the environment. This particularly stand out measures such as exponentiation of combustion air and the use of natural gas as the additional fuel: the emission of NOx is reduced from a level of 837 mg/m n 3 in conventional combustion to 710 mg/m n 3 using exponentiation of combustion air, or for more than 15%, and using natural gas as additional fuel it is reduced to 450 mg/m n 3 , or for more than 45%. Overall, the effects of the primary measures in the combustion chamber are mutually compared and quantified. In addition, the influence of applied primary measures in the combustion chamber on the behavior of ash in the co-firing process is analyzed. In this way, evaluation the fouling and slagging tendencies of the ash under given technical and technological conditions of co-firing coal with waste woody biomass is given.
Published Version
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