The gaseous pollutants that are under legislative regulation are CO, NOx, SO2, TOC and particulate matter. The EN 303-5 standard sets the limits for CO, TOC and particulate matter only. SO2 emissions can be neglected due to low sulfur content in biomass and NOx emissions cannot be effectively controlled in small biomass boilers. Efficiency of the boiler and the emissions of CO, TOC and NOx are dependent on the excess air ratio α, as shown on Fig. 1. The excess air ratio is a measure of excess of combustion air amount related to stoichiometric conditions and is defined by following equation:
The gaseous pollutants that are under legislative regulation are CO, NOx, SO2, TOC and particulate matter. The EN 303-5 standard sets the limits for CO, TOC and particulate matter only. SO2 emissions can be neglected due to low sulfur content in biomass and NOx emissions cannot be effectively controlled in small biomass boilers. Efficiency of the boiler and the emissions of CO, TOC and NOx are dependent on the excess air ratio α, as shown on Fig. 1. The excess air ratio is a measure of excess of combustion air amount related to stoichiometric conditions and is defined by following equation:
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