烟气低浓度氮氧化物前置臭氧氧化工艺研究
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摘要
采用数值模拟方法,结合标准k-ε模型、组分输运模型和层流有限速率模型,以某特定结构的臭氧投加设备为研究对象,对影响臭氧氧化工艺过程的相关因素进行深入分析。研究结果表明,NO的氧化效率随着烟气中O_3/NO摩尔比的增加而升高,但增加速率逐渐降低;当O_3/NO摩尔比为1、烟气温度为100～250℃时,NO的氧化效率随着温度的升高而降低;烟气中SO_2浓度对NO的氧化效率没有明显的影响。
Taking the ozone injector with a specific structure as study object,the factors that affect the ozone oxidation process are analyzed deeply by means of numerical simulation method combining with standard k-ε model,species transport model and laminar finite-rate model.Analysis result shows that the oxidation efficiency of NO raises with the increasing molar ratio of O_3/NO in flue gas,but the growth rate decreases gradually.The oxidation efficiency of NO will decrease with the increasing temperature when the temperature of flue gas locates in the range of 100-250℃ and the molar ratio of O_3/NO is set as 1.Meanwhile,the existence of SO_2 in flue gas has no obvious impact on oxidation efficiency of NO.
Taking the ozone injector with a specific structure as study object,the factors that affect the ozone oxidation process are analyzed deeply by means of numerical simulation method combining with standard k-ε model,species transport model and laminar finite-rate model.Analysis result shows that the oxidation efficiency of NO raises with the increasing molar ratio of O_3/NO in flue gas,but the growth rate decreases gradually.The oxidation efficiency of NO will decrease with the increasing temperature when the temperature of flue gas locates in the range of 100-250℃ and the molar ratio of O_3/NO is set as 1.Meanwhile,the existence of SO_2 in flue gas has no obvious impact on oxidation efficiency of NO.
引文
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[2]马贵鹏,王倩倩,马丽萍,等.氧化吸收一体化脱除硫硝汞技术研究进展[J].现代化工,2015,35(8):55-58.
[3]王智化.燃煤多种污染物一体化协同脱除机理及反应射流直接数值模拟DNS的研究[D].杭州:浙江大学,2005.
[4]路平,王玉爽,黄志伟,等.臭氧法脱硫脱硝工艺设计[J].现代化工,2017,37(4):171-174.
[5]张相.臭氧结合钙基吸收多种污染物及副产物提纯的试验与机理研究[D].杭州:浙江大学,2012.
[6]庄卓楷.基于数值模拟的NO臭氧氧化反应、双旋流气气混合器和湿法脱硝模型研究[D].杭州:浙江大学,2015.
[7]姜树栋.利用臭氧及活性分子协同脱除多种污染物的实验及机理研究[D].杭州:浙江大学,2010.
[8]马强,朱燕群,何勇,等.活性分子O3深度氧化结合湿法喷淋脱硝机理试验研究[J].环境科学学报,2016,36(4):1428-1433.
[9]Mok Y S,Lee H.Removal of sulfur dioxide and nitrogen oxides by using ozone injection and absorption-reduction technique[J]. Fuel Processing Technology,2006,87(7):591-597.
[10]孙承朗.燃煤工业锅炉臭氧氧化结合镁基湿法联合脱硫脱硝工艺研究[D].杭州:浙江大学,2015.
[11]Skalska K,Miller J S,Ledakowicz S.Kinetic model of NOxozonation and its experimental verification[J]. Chemical Engineering Science,2011,66(14):3386-3391.
[12]温正城.臭氧在烟气中氧化降解多种污染物的机理研究[D].杭州:浙江大学,2009.
[13]王静.臭氧烟气多脱技术中SO2氧化脱除的试验研究[D].杭州:浙江大学,2008.