燃煤烟气NO/SO_2对Cl/Cl_2形成过程的影响机制  

Effect Mechanism of NO/SO_2 on Cl/Cl_2 Formation in Coal-fired Flue Gas

作　　者：王帅[1] 高继慧[1] 吴燕燕[1] 汪细河 吴少华[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江省哈尔滨市150001 [2]武汉锅炉股份有限公司,湖北省武汉市430070

出　　处：《中国电机工程学报》2010年第20期33-38,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2006CB200303);国家863高技术基金项目(2007AA05Z307)~~

摘　　要：燃煤烟气中Cl/Cl2的形成过程对Hg0的转化有重要影响。应用CHEMKIN软件包,在典型燃煤烟气温降速率下,通过化学动力学模拟的方法,研究了NO/SO2对Cl/Cl2形成过程的影响,主要得出以下结论:Cl原子形成过程中OH是重要反应物,NO抑制Cl原子形成的原因是由于NO会与Cl原子生成反应竞争反应物OH。另外,NO与OH反应后的产物HONO会与Cl原子反应生成HCl和NO2,从而进一步降低烟气中的Cl原子浓度。SO2会大量消耗反应体系中的O原子,而O原子主要通过OH转化生成,O原子的大量消耗促进了OH转化为O原子,使得OH在Cl原子形成过程中的作用被削弱,从而使SO2抑制了Cl原子形成。Cl2主要通过Cl原子转化形成,因此Cl原子的形成受到抑制将同时导致Cl2形成过程受到抑制。Cl/Cl2 formation plays a significant role in Hg0 conversion process in coal-fired flue gas.This paper presented data taken by kinetic calculations based on a packet of CHEMKIN.The calculations were executed at a typical quench rate of coal-fired flue gas.Effects of NO/SO2 on Cl/Cl2 formation were researched.The results showed that OH was an important reactant during Cl atom formation.A part of NO react with OH,and compete with Cl-atom formation reactions for OH.Thus,NO has an inhibitory effect on Cl atom formation.Furthermore,the product of NO and OH,HONO,may react with Cl atom to form HCl and NO2.These reactions promote the consumption of Cl atom and finally cause a decrease in Cl2 concentration.Reaction of SO2 and O atom promotes the formation of O atom that is obtained by the conversion of OH,and the effect of OH on Cl formation is weakened.These reactions lead SO2 to inhibit the Cl formation process.Cl2 is formed mainly through the conversion of Cl atom,so the inhibition to Cl formation also causes an inhibition effect to Cl2 formation.

关 键 词：燃煤烟气 Cl/Cl2 CHEMKIN 化学动力学 

分 类 号：TM85[电气工程—高电压与绝缘技术]