Seawater/alkaline liquid cascade‐scrubbing desulfurization performance for the exhaust gas of a 162‐kW marine diesel engine. Issue 6 (13th September 2019)

• Record Type: Journal Article
• Authors: Kuang, Min; Hu, Xuehui; Yang, Guohua; Wang, Jinxin; Yuan, Guanghui; Tao, Chujiong; Wu, Sili; Ding, Jieyi; Meng, Xinyi
• Is Part Of: Asia-Pacific journal of chemical engineering. Volume 14:Issue 6(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-09-13
• Subjects: closed‐loop scrubbing -- desulfurization efficiency -- liquid–gas ratio -- open‐loop scrubbing -- seawater/alkaline liquid cascade‐scrubbing; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/apj.2370
• Languages: English
• ISSNs: 1932-2135

Abstract

Abstract: A cascade‐scrubbing technology was developed for marine diesel engines to improve the current once‐through desulfurization solutions. To confirm the seawater/alkaline liquid cascade‐scrubbing advantages of higher efficiencies and lower lye consumption compared with current solutions, desulfurization experiments with different scrubbing models were performed for a 162‐kW marine diesel engine. In the open‐loop model with SO2 of 1, 000–2, 860 mg/Nm 3, desulfurization with the allowed liquid–gas ratios ≤8 L/Nm 3 for the packing tower failed to fully meet the ECA's requirements, despite the efficiency increasing with liquid–gas ratio, seawater alkalinity, and packing height and decreasing with SO2 concentration. In the closed‐loop solution, to obligate the ECA's requirements with SO2 of 2, 860 mg/Nm 3, a high liquid–gas ratio of 4.8 L/Nm 3 was necessitated at Na/S=2. In contrast, in the seawater/alkaline liquid cascade‐scrubbing model under high‐sulfur and low‐alkalinity conditions (2, 860 mg/Nm 3 and 0.84 mmol/L), the solution utilized 5–6 L/Nm 3 seawater in the main scrubbing section to scrub 80–90% SO2 and an extremely low alkaline‐liquid dose below 1 L/Nm3 in the auxiliary scrubbing section to remove the residual SO2, finally allowing a high efficiency ahead of the open‐loop model and meanwhile cutting down an 80–90% lye consumption compared with the closed‐loop model.