| 摘要:低碳零碳能源已经成为航运业未来发展趋势，但同时也带来污染物排放问题，船舶排气污染物治理是绿色航运发展的关键挑战。现有的甲醇/柴油双燃料发动机排气中不仅有氮氧化物等常规污染物，还有甲醇、甲醛等非常规碳氢污染物，本研究介绍一种甲醇发动机排气中非常规碳氢污染物与氮氧化物协同处理技术，利用排气中甲醇/甲醛作为还原剂，在催化剂作用下进行催化还原反应，将两类污染物进行同步处理。通过搭建气固试验台架研究不同催化剂空速、反应温度、气体组分等工况下催化反应的影响，结果表明，在空速为12 000 h-1、NOx体积分数为2 000×10-6、甲醇体积分数为4 000×10-6、甲醇与NOx的体积分数比为2∶1、水分体积分数为5％、氧体积分数为10％的工况下，NOx转化效率达80%以上（最高90%）。该技术的推广应用可使甲醇燃料发动机后处理系统的紧凑性、经济性和使用便利性大大提高，为船舶高效减排提供创新解决方案。 |
| 关键词: 甲醇燃料发动机 排气治理 脱硝反应 转化效率 |
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| Exhaust Aftertreatment Technology for Marine Methanol Fuel Engines |
| Wei Mian,Xiao Zhaoyu,Lyu Xinzhuo,Tu Shien,Shen Teng |
| 1Shanghai Qiyao Environmental Technology Co.， Ltd.， Shanghai 201108， China;2Shanghai Maritime University， Shanghai 201306， China |
| Abstract:Low-carbon and carbon-neutral energy sources have become the future trend in the shipping industry，but they also pose challenges related to pollutant emissions.The management of exhaust pollutants from ships is a key challenge in the development of green shipping.Exhaust emissions from existing methanol/diesel dual-fuel engines contain not only conventional pollutants such as nitrogen oxides but also unconventional hydrocarbon pollutants such as methanol and formaldehyde.This study introduces a synergistic treatment technology for unconventional hydrocarbon pollutants and nitrogen oxides in methanol engine exhaust emissions，utilizing methanol/ formaldehyde in the exhaust as a reductant，under the action of a catalyst，to perform catalytic reduction reactions，thereby simultaneously treating both types of pollutants.By establishing a gas-solid test bench，the study investigated the effects of different catalyst space velocities，reaction temperatures，and gas compositions on the catalytic reaction.The results showed that under condition when space velocity is 12 000 h，NOx volume fraction is 2 000×10，methanol volume fraction is 4 000×10，the volume fraction ratio of methanol∶NOx is 2∶1，steam volume fraction is 5%，and oxygen volume fraction is 10%，the NOx conversion efficiency exceeds 80%（with a maximum of 90%）.The widespread application of this technology can enhance the compactness，economic efficiency，and usability of methanol dual-fuel engine aftertreatment systems，providing an innovative solution for efficient emissions reduction in ships. |
| Key words: methanol fuel engine exhaust gas treatment denitrification reaction conversion efficiency |
