Electric soot collector promises to mitigate emissions from residential biomass combustion – sciencedaily

Air pollution from residential biomass combustion is a known cause of adverse health effects, such as respiratory and cardiovascular disease, as well as adverse effects on the climate. Residential biomass combustion has been highlighted as a major source of air pollution almost everywhere in the world, causing particularly high emissions of fine particles, carbon black and polycyclic aromatic hydrocarbons (PAHs).

Currently, manufacturers of stoves and fireplaces face new challenges, as they will soon have to comply with strict emissions regulations, such as the Ecodesign Directive which will enter into force in the European Union in 2022. Therefore, there is a demand for new emission control solutions for the residential sector. biomass combustion.

A new study from the University of Eastern Finland presents a new method for reducing particulate emissions: the high-temperature electric soot collector, HiTESC. In HiTESC, an electrically insulated high voltage electrode is installed in a combustion chamber, which generates an electric field. The particles which acquire the electric charges produced by the flames are collected on the surface of the electrode and oxidized at high temperature.

Using HiTESC, researchers achieved a fine particle reduction efficiency of 45% in a log wood masonry heater with a burning procedure that looks like real use. Particulate emissions were measured with and without HiTESC for consecutive measurement days to determine the device’s overall fine particle reduction efficiency. In addition, the particle reduction efficiencies as a function of batch and burn phase were determined for the studied method with on-line measuring devices to investigate how operating conditions affect the effectiveness of the method.

The researchers found that the reduction efficiency of the method depended on the combustion phase. Fine particle reduction was most effective during flame conditions, when fine particle emissions were highest with the log wood appliance studied.

“The advantages of HiTESC are its simple construction, small footprint and low power consumption. In addition, it does not require a separate cleaning mechanism. HiTESC can also be installed in log wood burning appliances to meet future emission regulatory limits, without the need for expensive exhaust aftertreatment systems, ”explains the first author of the article. , Heikki Suhonen, early stage researcher at the University of Eastern Finland. The technology developed is currently being commercialized by the start-up Noeton.

The study shows that the use of natural flame charges can be used as a simple and feasible method to reduce fine particle emissions from log wood appliances. According to the researchers, further studies to optimize the generated electric field are needed to achieve potentially higher reduction efficiency for particles. In addition, although HiTESC can be retrofitted into existing wood-burning appliances, it is likely that better results would be obtained when the combustion device and the electrostatic device are designed and optimized together.

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Material provided by University of Eastern Finland. Note: Content can be changed for style and length.

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Kevin A. Perras