臭氧前置氧化NO_x的数值模拟与优化

Numerical simulation and optimization on pre-oxidation of NO_x by ozone

臭氧前置氧化工艺是多种污染物系统脱除技术的关键环节。为考察影响前置氧化工艺的因素及其机理,以某臭氧投加设备为研究对象建立计算域,根据反应机理和气体流动过程建立物理与数学模型,采用数值模拟的方法对臭氧前置氧化过程进行优化研究,并考察臭氧投加角度、O3/NO摩尔比、负荷对氧化反应的影响。结果表明,在适当减小臭氧投加角度,合理增大O3/NO摩尔比和负荷时可强化其氧化反应,研究所得结论对实际臭氧投加设备的设计与优化有一定的指导意义。

The process of ozone pre-oxidation is a key point in the removal technology of multi-pollutant system.In order to investigate the factors affecting the pre-oxidation process and their mechanism,the structure and operation of the oxidation process are optimized.A computational domain is established based on an ozone-adding device,the physical and mathematical models are established according to the reaction mechanism and gas flow process,and process of ozone pre-oxidation is optimized and studied by using the numerical simulation method.Then,the effects of ozone-adding angle,the molar ratio of O3/NO and load on oxidation reaction are investigated.The results show that the oxidation reaction can be enhanced when the ozone-adding angle is reduced appropriately and the O3/NO molar ratio and load are increased reasonably.The conclusions obtained have a certain guiding significance for the design and optimization of actual ozone-adding devices.