Journal
JOURNAL OF ENVIRONMENTAL ENGINEERING
Volume 146, Issue 1, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)EE.1943-7870.0001614
Keywords
Cascade-scrubbing; Seawater alkalinity; Liquid-gas ratio; Desulfurization efficiency
Funding
- National Key Research & Development Plan of China [2016YFC0205800]
- Scientific Research Foundation of Graduate School of Ningbo University [G18021]
- Program of Xinmiao Potential Talents in Zhejiang Province of China [2017R405043]
- Student's Platform for Innovation and Entrepreneurship Training Program of China [201811646018]
- K.C. Wong Magna Fund in Ningbo University
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To confirm the higher-availability and lower-resistance superiority of a proposed seawater/seawater cascade-scrubbing solution meeting the emission control area (ECA) requirements under harsh high-sulfur and low-alkalinity conditions, desulfurization experiments for the exhaust gas of a 162-kW marine diesel engine were compared between the cascade-scrubbing model and currently used once-through, open-loop solution. With the once-through seawater to scrub SO2 levels of 1,000-2,860 mg/Nm(3) (equal to about 1.8%-5% fuel-sulfur content), the desulfurization efficiency of the once-through system increased with the liquid-gas ratio and seawater alkalinity and decreased with SO2 concentration. At the harsh SO2 concentration of 2,860 mg/Nm(3) where the once-through scrubbing thoroughly failed to meet the ECA's requirements, an additional liquid-gas ratio increase above 8 L/Nm(3) was confirmed to be infeasible because of the potential for liquid flooding. In contrast, with a total liquid-gas ratio >= 9 L/Nm(3) (typically liquid-gas ratios of 7 and 2 L/Nm(3) in the main and auxiliary scrubbing sections, respectively), the cascade-scrubbing model easily met the ECA's desulfurization requirements under harsh high-sulfur and low-alkalinity conditions, along with its lower packing pressure-drop levels allowing for a further liquid-gas ratio increase. Aside from the above superiority compared with the once-through open-loop solution, the achievement of high-efficiency seawater desulfurization in this work suggests that the proposed seawater/seawater cascade-scrubbing solution should be more economical in comparison to the current closed-loop solution and hybrid system, which both necessitate costly NaOH usage. (C) 2019 American Society of Civil Engineers.
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