含水条件下多组分污染气体的FTIR同时在线测量  

Simultaneous on-line FTIR measurements of multicomponent pollutants in wet gas mixtures

作　　者：李天津[1] 禚玉群[1] 陈昌和[1] 徐旭常[1] 

机构地区：[1]清华大学热能工程系,热科学与动力工程教育部重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2008年第11期1971-1975,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(2006CB200301)

摘　　要：为实现燃煤烟气同时脱硫脱硝实验中含水条件下NO、SO2、NH3、NO2和N2O五种污染气体的同时在线测量,建立了FTIR定量分析方法。各组分气体的标定范围涵盖了实验室规模烟气脱硫脱硝实验中所用到的典型浓度。使用一系列已知浓度的混合气体对定量方法的性能进行了验证,并对测量误差进行了讨论。结果表明:选取合适的采样和定量方法参数,可以实现上述5种气体在含水条件下的同时在线高精度测量;在无H2O条件下,单组分测量结果误差为±2%;在5%H2O条件下,NO测量精度仍不降低;在5%H2O和14%CO2共存条件下,NO、SO2和NH3同时测量结果误差分别为±2%、±3%和±3%。An on-line quantitative analysis method was developed using FTIR to simultaneously measure NO, SO2, NH3, NO2 and N2O in wet gas mixtures for simultaneous SO2 and NOx control experiments. The calibrated range for each component covers the typical concentration ranges commonly observed in laboratory-scale flue gas desulfurization and denitrification analyses. Experimental results show that accurate concentrations of NO, SO2, NH3, NO2 and N2O in wet gas mixtures can be simultaneously measured on-line by appropriately selecting the sampling parameters and the analysis parameters of this method. The accuracy of a single gas component measurement in the absence of H2O is estimated to be ±2%, with the NO measurement accuracy not reduced in gas mixtures with 5% H2O. The simultaneous measurement accuracies of NO, SO2, and NH3 are ± 2%,± 3%, and ±3%, respectively, in the presence of 5% H2O and 14% CO2.

关 键 词：气体分析 FTIR 在线测量 同时脱除 烟气脱硝 

分 类 号：X502[环境科学与工程—环境工程]