ANALYSIS OF SELECTED WOOD BIOFUELS AND EVALUATION OF THEIR THERMAL EMISSION PROPERTIES

This article describes the fuel properties of used biofuel samples in the form of pellets and subsequent thermal emission properties in the burner combustion plant with automatic feeding of fuel. There are four samples of spruce wood biomass and four samples mixed with spruce pine 1:1. On these samples is carried out elemental and stoichiometric analysis. The results of these analyzes show the same characteristics of used sample. The samples are sequentially burned in the automatic burner combustion plant with automatic feeding of fuel. With the help of flue gas analyzer are set emission of carbon monoxide, oxides of nitrogen and flue gas temperature. The resulting values are statistically analyzed by regression analysis. Using the regression equation is backward assigned the coefficient of excess air and is set the average thermal emission concentration for samples from spruce and samples from wood mixture depending on the coefficient of excess air with the indicated scattering measurements. The results show increased concentration of carbon dioxide in the absence of combustion air during combustion of spruce samples. By reducing the combustion temperature there is no large increase in the emission of nitrogen oxides concentrations in spruce samples. For further use of combustion device based on the burner furnance can be improved combustion conditions by more balanced supply of fuel to the burner and better control of the combustion air.