Li Wenjun, Zhang Yongxin, Zhao Zhongyang, Liu Chang, Wang Yifan, Shen Mingqiang, Dai Haobo, Yang Yang, Zheng Chenghang, Gao Xiang
State Key Laboratory of Clean Energy Utilization, State Environmental Protection Engineering Center for Coal-Fired Air Pollution Control, Zhejiang University, Hangzhou, People's Republic of China.
Zhejiang Energy Marine Environmental Technology Co., Ltd, Hangzhou, People's Republic of China.
J Air Waste Manag Assoc. 2022 May;72(5):383-402. doi: 10.1080/10962247.2021.2003912. Epub 2022 Mar 16.
Ships have become an important source of SO emission in coastal areas with the rapid development of maritime transport. It is of great significance to develop a marine scrubber for reducing SO emission of ships. In this study, numerical simulation of a full-scale marine spray scrubber is conducted to investigate two-phase flow pattern and SO absorption process in the scrubber. A desulfurization model based on seawater absorbent is coupled into the simulation, which considers the mass transfer between phases and seawater aqueous phase chemistry simultaneously. A distribution ring is introduced in the scrubber to enhance the desulfurization performance of the scrubber. The result of simulation shows that the distribution ring can optimize effectively the distribution of gas-liquid phases and enhance the SO absorption. Under vertical condition, the desulfurization efficiency could be promoted approximate 6% after installing a distribution ring. The inclined condition resulting from the ship swinging could lead to the uneven distribution of droplets and an obvious decrease (8.7%) of desulfurization efficiency, whereas the desulfurization performance of the scrubber could be ensured with a distribution ring installed even under an inclined condition. Finally, a spray scrubber design scheme has been developed and successfully applied in the exhaust gas cleaning system (EGCS) of a container ship. Test result shows the outlet average value of SO/CO can be reduced to 3.55. Meanwhile, the consistency of test data and calculation result indicates the applicability of the numerical model established for the simulation and optimization of the scrubber in industrial applications also.: EGCS is an effective method to reduce SO emission of marine industry. However, different from a land desulfurization tower, the application of a spray scrubber in EGCS faces more problems due to the different application scenarios and complex sea conditions (inclined condition resulting from ships swinging and so on) during sailing. In this work, a numerical model capable of investigating physical and chemical phenomena in the scrubber simultaneously is established, which can produce a great amount of data for the operation instruction of EGCS and the design and optimization of the marine spray scrubber. The distribution ring is introduced in the marine spray scrubber to intensify the SO absorption and enhance the desulfurization performance of the scrubber under different working conditions.
随着海上运输的快速发展，船舶已成为沿海地区二氧化硫排放的重要来源。开发一种用于减少船舶二氧化硫排放的船用洗涤器具有重要意义。在本研究中，对全尺寸船用喷雾洗涤器进行了数值模拟，以研究洗涤器内的两相流型和二氧化硫吸收过程。将基于海水吸收剂的脱硫模型耦合到模拟中，该模型同时考虑了相间传质和海水水相化学。在洗涤器中引入了分布环以提高洗涤器的脱硫性能。模拟结果表明，分布环可以有效地优化气液相分布并增强二氧化硫吸收。在垂直条件下，安装分布环后脱硫效率可提高约6%。船舶摇摆导致的倾斜条件会导致液滴分布不均匀，脱硫效率明显降低（8.7%），而即使在倾斜条件下安装分布环也能确保洗涤器的脱硫性能。最后，开发了一种喷雾洗涤器设计方案，并成功应用于一艘集装箱船的废气清洁系统（EGCS）。测试结果表明，二氧化硫/一氧化碳的出口平均值可降至3.55。同时，测试数据与计算结果的一致性表明，所建立的数值模型适用于工业应用中洗涤器的模拟和优化。：EGCS是减少海洋工业二氧化硫排放的有效方法。然而，与陆地脱硫塔不同，喷雾洗涤器在EGCS中的应用由于航行期间不同的应用场景和复杂的海况（船舶摇摆导致的倾斜条件等）而面临更多问题。在这项工作中，建立了一个能够同时研究洗涤器内物理和化学现象的数值模型，该模型可为EGCS的运行指导以及船用喷雾洗涤器的设计和优化提供大量数据。在船用喷雾洗涤器中引入分布环，以强化二氧化硫吸收并提高洗涤器在不同工况下的脱硫性能。
