A novel electrical charging condensing heat exchanger for efficient particle emission reduction in small wood boilers

Julija Grigonytė-Lopez Rodriguez, Heikki Suhonen, Ari Laitinen, Jarkko Tissari, Miika Kortelainen, Petri Tiitta, Anna Lähde, Jorma Keskinen, Jorma Jokiniemi and Olli Sippula

Renewable Energy, 2020, vol. 145, issue C, 521-529

Abstract: Small-scale biomass combustion is an important source of fine particles in ambient air, causing adverse health and environmental effects. Thus, there is a clear need to develop efficient and feasible flue gas cleaning technologies for small-scale combustion appliances. In this study a novel electrical charging condensing heat exchanger (eCHX) for combined fine particle removal and efficient heat recovery from flue gases was demonstrated in a small biomass-fired boiler. The method is based on the combination of a shielded corona charger and a condensing heat exchanger, where fine particles are removed by the electrophoretic, thermophoretic and diffusiophoretic forces. The eCHX was found to decrease >80% of fine particle mass (PM1) emissions and >40% of particle number emissions with simultaneous high thermal efficiency in the heat exchanger. The usage of the condensing heat exchanger without electrical charging resulted in 40% decrease in PM1 emissions when compared to the usage of a traditional tube heat exchanger. The advantage of the eCHX system is that it replaces the conventional heat exchanger in boilers, making it a compact and inexpensive solution, when compared to additional flue gas cleaning devices installed after the boiler.

Keywords: Particle emission; Heat exchanger; Biomass combustion; Electrical charging (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:145:y:2020:i:c:p:521-529

DOI: 10.1016/j.renene.2019.06.052

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