Increasing the Efficiency of the Process of Burning Wheat Straw in a Central Heat Source by Application of Additives
Straw belongs to heavier combustible fuels as it has low ash melting temperature. This article discusses the properties and effects of various additives suitable for application to straw in order to increase the ash melting temperature. From the laboratory-determined results of the application of various additives, the most suitable additive was chosen to improve the process of incinerating wheat straw in real conditions. This additive was calcium oxide. Testing of the additive was carried out in real conditions on operation of drying system situated near Nové Zámky. The drying system receives the heat from burning straw bales on the heat source. In the combustion process there are various problems due to the low melting temperature of ash straw. For this reason, slags and deposits occur in different parts of the combustion chamber and on the heat exchanger. These deposits must be removed at regular intervals, which cause heat source shutdown and drying. Addition of the additive on the surface of the straw bait was performed manually. The influence of additives on slags formation, thermal performance and emission production were measured during the experiment The results of additive testing have confirmed the positive effect of calcium oxide on the efficiency of the straw burning process.
KeywordsStraw Additive Low melting temperature Calcium oxide
This work was supported by the projects APVV-15-0790 “Optimization of biomass combustion with low ash melting temperature”.
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