Abstract
Measurements of pollutant concentrations in the flue gases of a biofuel boiler show that pollutants concentrations fluctuate by 10-100% and more at short time intervals. Large fluctuations in concentrations hinder the effective application of pollution reduction measures. During the research, flue gas composition measurements were performed in 4 MW, 8 MW industrial biofuel boilers and 20 kW experimental model. The results of the research showed that the change of CO, NO, NO2, SO2, H2S, O2 and particulate matter concentrations is related to the periodicity of the boiler grate movement. During the movement of the grate, the surface of the fuel bed is mechanically disrupted. The different composition of the fuel layers is mixed and this affects the changes in the concentration of combustion products. The clarity of the concentration fluctuations depends on the emissions, the type of fuel and the combustion parameters.
Highlights
The use of solid biofuels - forest residues, wastes from the wood, agriculture, food industry and other biomass is one of the most effective ways to achieve renewable energy development goals and reduce the greenhouse effect
There is a clear correlation between N content in fuels and NOx emissions [1]
Some of the emissions are generated in the fuel bed, where the nitrogen and sulfur compounds in the fuel are oxidized in the fuel bed or a short distance above it
Summary
The use of solid biofuels - forest residues, wastes from the wood, agriculture, food industry and other biomass is one of the most effective ways to achieve renewable energy development goals and reduce the greenhouse effect. Due to the relatively fast recovery of biomass compared to fossil fuels, biofuels are considered a renewable source. The N content in biomass can be as high as a few percent, which is typical of some wastes from the agricultural and furniture industry. High N content in fuels has been found to cause high NOx concentrations during fuel nitrogen oxidation processes. There is a clear correlation between N content in fuels and NOx emissions [1]. Comparative NOx reduction studies [2] have shown that NOx concentrations can be reduced by a variety of measures but only to a certain extent
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