Investigation of dust resistivity for a fractioned biomass fly ash sample during poor combustion conditions with regard to electrostatic precipitation

摘要

It is well known that dust resistivity and particle size play a major role in electrostatic precipitation processes. The electrostatic precipitator design also has to be adapted for carbon rich fly ashes such as those found in heavy fuel oil combustion plants. In this work, an ash sample from an electrostatic precipitator downstream an industrial biomass boiler operated under poor combustion conditions was air classified into 5 particle size fractions. Those fractions were then analyzed regarding chemical composition, loss on ignition, particle size distribution and dust resistivity. Furthermore scanning electron as well as optical microscope images were taken to investigate particle structure and shape.