Marine Emission Pollution Abatement Using Ozone Oxidation by a Wet Scrubbing Method
Marine Emission Pollution Abatement Using Ozone Oxidation by a Wet Scrubbing Method
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湿式洗涤法利用臭氧氧化减少海洋排放污染
DOI：
10.1021/acs.iecr.6b01038
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发表时间：
2016
影响因子：
4.2
通讯作者：
Zhu Yuanqing
中科院分区：
文献类型：
--
作者：
Zhou Song;Zhou Jinxi;Feng Yongming;Zhu Yuanqing
船用柴油机排放的废气中含有大量的SO2和NOx。本文提出了一种能够同时去除NOx和SO2的工艺，该工艺利用臭氧氧化和碱性逆流填料洗涤器。考察了臭氧的分解、NOx的氧化性能以及NOx和SO2的去除效果，确定了最佳工艺条件。对同时脱硫脱硝的反应机理和产物进行了推导。结果表明，臭氧的分解速率取决于废气温度和臭氧初始浓度。随着温度的升高和臭氧初始浓度的降低，NOx的氧化效率降低。SO2的存在对NO转化过程影响不大。CO（NH2）2是降低臭氧消耗量的最佳还原剂。实验结果表明，在温度为150 °C、臭氧与NO的化学计量比为0.6、pH值为8左右的条件下，碱性吸收法对SO2和NOx的还原效果最佳。该方法可同时脱除93%的NOx和接近100%的SO2，达到国际海事组织（IMO）的要求。
Marine diesel engines produce exhaust gas including a lot of SO2and NOx. This paper proposes a process that is capable of removing NOx and SO2simultaneously; this process utilizes ozone oxidation and an alkaline countercurrent packed scrubber. Ozone decomposition, oxidation properties of NOx, and removal efficiency of NOx and SO2were investigated, and the optimal factors were established. The reaction mechanism and products for simultaneous desulfurization and denitration were deduced. Results show that the ozone decomposition rate depends on exhaust gas temperature and initial concentration of ozone. Oxidation efficiency of NOx decreases as temperature rose and initial concentration of ozone reduced. The presence of SO2has little influence on NO conversion process. CO(NH2)2is the best reducing additive to reduce the consumption of ozone. The optimal factors for SO2-reduction and NOx-reduction were achieved, such as temperature of 150 °C, stoichiometric ratio between ozone and NO of 0.6, and pH about of 8 by alkaline absorption. With this method, about 93% NOx and close to 100% SO2can be removed at same time and regulations of the international maritime organization (IMO) can be met.