商业SCR催化剂在蓄热式换热条件下脱硝性能的数值模拟  

Numerical Simulation of the Denitrification Performance of the Commercial SCR( Selective Catalytic Reduction) Catalyst Under the Condition of Heat Accumulation Type Heat Exchange

作　　者：田中君[1] 靳世平[1] 刘政杰[1] 黄素逸[1] 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《热能动力工程》2014年第4期415-419,461,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51076057)

摘　　要：为了进一步减少HiTAC(高温空气燃烧)过程中产生的氮氧化物NOx,将蜂窝状SCR(选择性催化还原)催化剂植入HiTAC系统的蓄热室中,建立了关于蓄热式换热及NO催化还原的一维数学模型,其中反应物吸附及反应过程依从Eley-Rideal机理,对催化剂在非稳态下脱硝性能进行了数值模拟研究。结果表明:反应速率常数与停留时间对应值——速度的倒数的变化幅度均随换向时间延长而增大;气体速度随空速呈完全线性变化;出口NO浓度呈周期性变化;NO转化率随换向时间的延长而增大,随空速的增大而减小。To further reduce the NOxproduced in the process of high temperature air combustion,the honeycomb selective catalytic reduction catalyst was put into the heat accumulation chamber of a HiTAC system and a one-dimensional mathematical model for heat accumulation type heat exchange and NOxcatalytic reduction was established,of which the reactant adsorption and reaction process complied with the Eley-Rideal mechanism and a numerical simulation study of the denitrification performance of the catalyst in the unsteady state was conducted. It has been found that the corresponding values to the reaction speed constant and the residence time—the variation range of the reciprocal of the speed will increase with an elapse of the direction changing time,the gas speed will assume an entirely linear change with the air speed,the NO concentration at the outlet will exhibit a periodical change,the NO conversion rate will increase with an elapse of the direction changing time and decrease with an increase of the air speed.

关 键 词：HiTAC SCR 蓄热式换热 数值模拟 脱硝性能 

分 类 号：X511[环境科学与工程—环境工程]