光催化/VUV/海水吸收协同用于舰船烟气脱硫脱硝的研究

Study of Collaboration Application of Photocatalysis/VUV/Seawater Absorption for Desulphurization and Denitrification of Vessel Flue Gas

针对舰船烟气脱硫脱硝需求,提出采用光催化/真空紫外(Vacuum Ultraviolet,VUV)辐射协同海水吸收脱硫脱硝一体化技术,强化SO2和NO在海水中的传质吸收过程。基于舰船烟气脱硫脱硝的过程分析机理,设计小试装置模拟舰船的烟气脱硫脱硝系统,开展实验探究液气比、温度、空速、SO2和NO初始浓度等关键参数下的系统脱硫脱硝率,揭示参数间的相互作用规律。实验结果表明,该系统最佳液气比≤6.5 L·m-3,空速≤680 h-1,系统脱硫率随温度升高而降低,而脱硝能力在温度高于60℃时有所增强,较纯海水吸收SO2脱除率为100%时液气比可减少1.5 L·m-3,大大减少了反应器负荷,可适用于舰船烟气脱硫脱硝。NO脱除率随SO2初始浓度从1600 mg·m-3增至3800 mg·m-3时而减小,而SO2初始浓度超过3800 mg·m-3后对NO脱除率几乎无影响;SO2的脱除效率不随NO初始浓度的变化而变化。且模拟舰船处于淡水区时,脱硫脱硝效果分别达到90%和80%以上,仍满足模拟舰船在淡水区脱硫脱硝的目的。综合分析,兼具运行成本低、设备尺寸小及脱硫脱硝效果好等优点的光催化/VUV协同海水吸收脱硫脱硝一体化技术在舰船烟气净化领域具有重要的应用价值。

In this paper,an integrated technology of photocatalysis/VUV/seawater absorption fordesulfurization and denitrification of vessel flue gas was proposed,satisfying the demand of vessel flue gas treatment,aiming to strengthen the study of mass transfer and absorption process of SO2 and NO in seawater.Based on the mechanism analysis of vessel flue gas desulfurization and denitrification process,experiments carried on a small-scale device was designed to simulate this condition.Influencing factors involving liquid-gas ratio,temperature,airspeed,together with SO2 and NO initial concentration were investigated to explore the optimum condition for flue gas desulfurization and denitrification.