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EFFECTIVELY PREVENT EMITTING BLACK CARBON AND PM2.5 POLLUTION INTO THE AIR WITH ELECTRORHEOLOGY
Chen, Zhi
Chen, Zhi
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Thesis/Dissertation
Date
2025-05
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Physics
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DOI
https://doi.org/10.34944/yq77-2371
Abstract
Black carbon, an important part of PM2.5 air pollution (usually constitutes 5% - 20% of PM2.5 particles in urban areas and can be more in heavy industry regions), known as “silent killer”, is also the second largest contributor to global warming. Because per unit of mass, black carbon has a warming impact on climate 460 – 1,500 times stronger than CO2, United Nations Environment Program (UNEP) and World Meteorological Organization (WMO) recently emphasized that the black carbon issue for global warming is more urgent than CO2 now. To resolve this urgent issue, many technologies have been introduced. Among them, the technology of electrostatic air filters has received much attention and developed many applications. Unfortunately, none of these technologies can eliminate black carbon particles at the source of emissions, such as power plants, large manufacturing facilities and cargo ships, to prevent emissions of black carbon into the air because they all rely on extra filters to capture the black carbon particles. Such carbon filters typically have short lifetimes, cannot sustain higher temperatures, cannot work with high airflow either. Consequently, the current technologies cannot be adopted by the main pollution sources to control black carbon particles. Therefore, as indicated by UNEP and WHO, new technology that can effectively catch black carbon particles and other PM2.5 pollutants and prevent them from entering the air is urgently needed.
Here in this thesis, we report our new electrorheological technology, which can meet such urgent needs to capture all PM2.5 particles in exhaust air, including black carbon particles effectively, and can be relatively easily installed in the emission system of power plants, manufacturing facilities and cargo ships, achieving the pollutant source control. This new technology is based on the physics of electrorheology. Under a strong electric field, black carbon particles and other particulate pollutants are polarized and attracted toward electrodes. When the polluted airflow becomes a special flow with pollutant particles moving adjacent to the surface of electrodes, black carbon and other particles are captured by the electrodes, following the basic physics of electrorheology. Our laboratory tests have confirmed that this technology can capture more than 98% of black carbon and other PM2.5 particles. Different from the current electrostatic precipitators, which utilize foam-like electrodes to cause corona discharge to deal with suspended pollutants, require low flow speed and not very effective on black carbon particles, our new technology is effective to remove all suspended polluters including black carbon. Our electrorheological technology utilizes electrodes made of flat metals and the electric field perpendicular to the airflow. Therefore, it can allow high exhaust airflow through the particle-removing channels. The captured particulate matters can be sucked out quickly by vacuum cleaners when the electric field is turned off. This technology will not only be suitable for residential and commercial buildings as air filters to provide clean air, but more importantly, it will also be appropriate for large industrial facilities and freighters to control emission from combustion systems (coal-fired boilers, HD diesel engines, etc.). It can be incorporated into chimneys, flue liners and exhaust pipes to prevent emission of black carbon and other PM2.5 particles into air. Such applications are critically and urgently needed as the current technologies fail to do so. We also note that this technology is much more energy efficient than the current electrostatic air filters since it does not rely on corona discharges, which consume a lot of power.
In view of the assessment by UNEP and WMO that presently black carbon particles become the most urgent issue for global warming, and create significant negative impact to human health, we hope that our technology will help mitigate global warming, improve the environment, and protect public health.
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