O_(3)/·OH簇射烟气脱除甲苯的数值模拟

Numerical simulation study on toluene removal by O_(3)/·OH radical shower in flue gas

利用Fluent软件耦合化学反应机理对O_(3)与·OH簇射烟气脱除甲苯进行了数值模拟。针对圆形面为入射面的圆柱形管道,通过模拟计算不同位置截面上的甲苯平均浓度,得到管道各个位置的甲苯脱除效率。在不同温度、射流速度、气体组分、自由基配比等工况条件下,模拟研究O_(3)/·OH对甲苯的脱除规律,分析影响O_(3)/·OH对甲苯脱除效率的关键因素。结果发现,提升温度对脱除效率有较大提升,而自由基浓度、射流速度、水分浓度与氧气浓度等参数均对脱除甲苯效率均有一定影响。由于在复杂的烟道系统中O_(3)具有更长的活性周期,因此,比·OH有更高的甲苯脱除效率,约4%的优势。当O_(3)和·OH混合配比为20%时,脱除效率较其他配比情况要高出约5%,这表明·OH和O_(3)可协同进行甲苯脱除。本研究可为优化含甲苯的焚烧废气脱除净化技术提供参考。

The removal of toluene by O_(3)/·OH radical shower in flue gas was simulated numerically using Fluent software coupled with chemical reaction mechanism.The removal efficiency of toluene in the different cylindrical pipe was obtained by simulating the average toluene concentration on different sections of the cylindrical pipe with the circular surface as the incident surface.The removal of toluene by O_(3)/·OH was simulated under different operating conditions such as temperature,jet velocity,gas composition and free radical ratio,and the key factors affecting the removal efficiency of toluene by O_(3)/·OH were analyzed.The results showed that the removal efficiency was greatly improved by increasing the temperature,and the free radical,water and oxygen proportion,jet velocity had certain effects on the removal efficiency of toluene.Due to the longer activity cycle of O_(3) radical in complex flue system,O_(3) has a higher toluene removal efficiency than·OH,with an advantage of about 4%.When the ratio of O_(3) and OH was 20%,the removal efficiency was about 5%higher than that of other ratios,indicating that there was a certain synergistic effect between·OH and O_(3) radicals.This study can provide reference for optimizing the removal and purification technology of toluene containing incineration waste gas.