Electrostatic removal of ultrafine carbon black with square-grooved collecting plates: Insights for capturing black carbon emitted from ships

Wu, Zhicheng; Wang, Yifan; Shao, Lingyu; Zhang, Hao; Dai, Haobo; Fan, Haidong; Zheng, Chenghang; Gao, Xiang

doi:10.1016/j.jes.2022.11.003

Cited by 3 publications

(6 citation statements)

References 37 publications

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“…The microstructure of the SP-BC was examined by scanning electron microscopy (SEM, SU-8010, Hitachi Ltd., Japan) as shown in Figure a. The SP-BC exhibited an aggregate morphology resembling grape bunches, and the average diameter of a single SP-BC particle was around 50 nm . Chemical composition analysis using an energy-dispersive spectrometer (EDS) indicated that SP-BC consisted mainly of carbon and oxygen, as shown in Figure b.…”

Section: Methodsmentioning

confidence: 99%

“…The fractional particle number and mass concentrations of the submicrometer or nanoscale SP-BC generated before and after the scrubber were measured using the electrical low-pressure impactor (ELPI + , Dekati Ltd., Finland). The ELPI + is a reliable real-time instrument for BC measurement and has been widely used for such a purpose. , A diluter (DI-2000, Dekati Ltd., Finland) was matched with ELPI + to dilute the flue gas at a ratio of 1:8, ensuring accurate and stable operation of the ELPI + instrument. The fractional SP-BC collection efficiency η i , the total SP-BC number, and mass removal efficiencies η number and η mass , were calculated by the following equations η i = 1 − N outlet false( normali false) N inlet false( normali false) × 100 % η number = 1 − ∑ N outlet ( i ) ∑ N inlet ( i ) × 100 % η mass = 1 − ∑ M outlet ( i ) ∑ M inlet ( i ) × 100 % where N inlet and N outlet represent the inlet and outlet SP-BC number concentrations (1/cm 3 ) detected by ELPI + , respectively, and i refers to the ELPI + impactor stage with 14 size fractions.…”

Section: Methodsmentioning

confidence: 99%

“…The SP-BC exhibited an aggregate morphology resembling grape bunches, and the average diameter of a single SP-BC particle was around 50 nm. 50 Chemical composition analysis using an energy-dispersive spectrometer (EDS) indicated that SP-BC consisted mainly of carbon and oxygen, as shown in Figure 2b. Furthermore, the hydrophilic angle of the SP-BC was measured by a video-based contact angle measuring device (OCA 20, Dataphysics Ltd., Germany).…”

Section: Properties Of Experimental Sp-bcmentioning

confidence: 99%

“…The ELPI + is a reliable realtime instrument for BC measurement and has been widely used for such a purpose. 39,50 A diluter (DI-2000, Dekati Ltd., Finland) was matched with ELPI + to dilute the flue gas at a ratio of 1:8, ensuring accurate and stable operation of the ELPI + instrument. The fractional SP-BC collection efficiency η i , the total SP-BC number, and mass removal efficiencies η number and η mass , were calculated by the following equations…”

Section: Properties Of Experimental Sp-bcmentioning

confidence: 99%

“…A higher number concentration did not necessarily correlate with a higher mass concentration. 51 Therefore, concurrently studying both of these concentrations allowed us to elucidate the particle size distribution and agglomeration status of the particles.…”

Section: Properties Of Experimental Sp-bcmentioning

confidence: 99%

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Hydrophobic Black Carbon Capture from Ship Emissions Based on a Charger-Coupled Wet Scrubber

Wu,

Zhou,

Zhou

et al. 2023

Energy Fuels

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Black carbon emissions from ships have been identified as a significant contributor to the accelerated melting of Arctic glaciers, and there has been a lack of standardized methods for controlling them. In this study, a comprehensive approach to address ship-based hydrophobic black carbon with simulated nanoparticles (SP-BCs) was developed through enhanced scrubbing by electrostatic charging. The charger-coupled wet scrubber exhibited significant improvement under a low flue gas velocity (1 m/s) and a low liquid-to-gas ratio (L/G ratio, 8 L/m3), where the collection efficiency of the nanoscale SP-BC was increased by over 25%. In addition, many SP-BCs escaped from the outlet of the conventional wet scrubber during a long period of spraying at high intensity. Applying an electrostatic charger, increasing the L/G ratio, and increasing the flow velocity could effectively suppress the escape of black carbon particles during prolonged cyclic spraying. Furthermore, the optimal electric field intensity for the charger was 6.5 kV/cm to ensure a long-term stable operation. The charger-coupled wet scrubber could achieve a minimum emission concentration of SP-BC as low as 4.48 mg/m3, with a corresponding collection efficiency of 91.3%. The results have significant implications for low-resistance and high-efficiency black carbon emission control from ships.

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Section: Methodsmentioning

confidence: 99%