Abstract
New particulate matter (PM) filtering technologies are needed to meet the emission regulations for small combustion appliances. In this work, we investigate the performance of a novel electrical particle filtration system, the single needle shielded corona charger (SCC), which offers an advantageous solution for PM control in boilers by enhancing particulate deposition within existing boiler sections. Experiments under different operating conditions of a wood-fired boiler were performed, wherein the SCC was installed upstream of either a condensing heat exchanger (CHX) or a cyclone. PM reduction was found to be strongly affected by the SCC temperature and the following collection surface area, and reached its highest reduction efficiency of >90% at the temperature range of 400–500 °C when operating in combination with a CHX. The SCC–cyclone combination was less efficient, providing a 27% PM reduction, as a result of the low surface area and residence time in the cyclone. These results indicate that the SCC can feasibly provide particle filtration when combined with a CHX, wet scrubber, or a cyclone to meet the new emission regulation requirements. The system is best suited for small-scale boilers but can be scaled up to larger boilers by increasing the number of corona chargers.
Highlights
Wood combustion is a major source of particulate and black carbon emissions in Europe [1,2], causing adverse impacts on public health and the climate
We investigate the performance of a novel electrical particle filtration system, the single needle shielded corona charger (SCC), which offers an advantageous solution for particulate matter (PM) control in boilers by enhancing particulate deposition within existing boiler sections
PM reduction was found to be strongly affected by the SCC temperature and the following collection surface area, and reached its highest reduction efficiency of >90% at the temperature range of 400–500 ◦C when operating in combination with a condensing heat exchanger (CHX)
Summary
Wood combustion is a major source of particulate and black carbon emissions in Europe [1,2], causing adverse impacts on public health and the climate. In Europe, the new Ecodesign Directive (EU 2015/1189) set a particle emission limit of 40 mg/m3 for automatic biomass boilers with a thermal power less than 500 kW in the beginning of 2020. For logwood-fired open and closed room heaters, the Ecodesign Directive (2015/1185) set particle emissions limits of 40 mg/m3 and 50 mg/m3, respectively, in the beginning of 2022. There is a need to develop an economically feasible but efficient particle filtration technique for 1–5 MW boilers regulated by the MCP directive. For boilers of this size, traditional electrostatic precipitators (ESPs) and fabric filters can be costly, but achieving the emission limits often requires effective particle filtration [7,8]
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