Enhanced particulate filter with electrostatic charger: Insights for low-resistance and high-efficiency ship-based nanoscale black carbon capture
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION(2024)
摘要
Black carbon emission from ships has attracted great concern due to its significant impact on the environment, climate, and human health. This study presents a comprehensive approach to address black carbon emissions from ships with simulated nanoparticles (SP-BC) by integrating a particulate filter with an electrostatic charger (EC-PF). Low filtration velocity (1.5 cm/s) is beneficial for the high-efficiency and low pressure drop collection of SP-BC by PF, while the optimum filtration temperature should be within 673 K to prevent decomposition and fragmentation of SP-BC. The electrostatic charger can significantly improve the PF collection efficiency by 10% while reducing the PF pressure drop variation by nearly 50%, based on the looser DPM layer formation and electrostatic attraction. Varying applied voltage in EC-PF systems have different effects on the efficiency and pressure drop, and 80% of the maximum applied voltage (i.e. 21 kV at 573 K)is considered the optimal operating mode of EC-PF, with a reduction in the median diameter of more than 20 nm compared to the PF. For long-term operation, the operating voltage should be reduced to mitigate the occurrence of breakdown and prevent a significant increase in pressure drop. At higher filtration velocities of up to 9 cm/s, the efficiency enhancement of the EC-PF becomes more apparent, with collection efficiencies exceeding 90%. In addition, pulse-jet cleaning is shown to be a feasible assisted regeneration method for EC-PF with a low pressure drop after regeneration. Consequently, this study has significant implications for low-resistance and high-efficiency ship-based black carbon capture, contributing to the mitigation of Arctic glacier melting and global warming.
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关键词
Ship -based black carbon control,Electrostatic charger,Particulate filter,pulse -jet cleaning assisted,regeneration
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