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Rapid Determination of Different Nitrogen Oxides in the Outlet Gas from the Iron Ore Sintering Process by Means of Infra-red Spectroscopy

红外光谱法快速测定铁矿石烧结过程尾气中的不同氮氧化物

基本信息

批准号：
06555220
负责人：
KASAI Eiki
金额：
$ 4.29万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

A new method quantitatively determining a small amount of nitrogen oxide species and other gases take a part in the formation of nitrogen oxides were developed. This method can be applicable to the conditions, where the concentrations of gaseous species are quite low and they change rapidly. The principle of the measurement is an application of Fourier Transform Infra-red Spectroscopy (FTIR). The determination limit and response for 90% are 0.5ppm, respectively. It becomes possible due to rapid elimination of water vapor which gives wide range of infra-red absorption bands by the multi-pipe made of molecule-exchange film and due to limitation of measured absorption peaks of objective gases which are not influenced by residual water vapor, carbon-dioxide, methene and so forth.The major feature of the developed method is as follows :1) Software for determination of gaseous concentration : Optimum algorithm for high-speed calculation and record of spectra data considering proper range of absorption corresponding to objective gases.2) Gas cell with a small volume and optical length : Gas cell having inner volume 100cc and optical path 10m was applied. Gas flow condition in the gas cell was optimized by the mathematical simulation.3) Application to modeled and combustion gases : Calibration curve was prepared using various standard gas mixtured and then it was applied to actual combustion gases. The results gives the validity of the method.

建立了一种定量测定氮氧化物生成过程中少量氮氧化物和其它气体的新方法。该方法适用于气体组分浓度较低且变化较快的情况。测量的原理是傅里叶变换红外光谱（FTIR）的应用。90%的测定限和响应值分别为0.5ppm。由于分子交换膜制成的多管能迅速排除水蒸气，产生宽范围的红外吸收带，同时由于目标气体的吸收峰受限制，不受残余水蒸气、二氧化碳、甲烷等气体的影响，因此，本方法的主要特点是：1）气体浓度测定软件;考虑到目标气体的适当吸收范围，用于高速计算和记录光谱数据的优化算法。2）具有小体积和光学长度的气室：使用具有100 cc内体积和10 m光路的气室。通过数学模拟，优化了气室中气体的流动条件。3）模型气体和燃烧气体的应用：用各种标准气体混合制备校准曲线，并将其应用于实际燃烧气体。结果表明了该方法的有效性。