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

• 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
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555220/
• 关键词: Infra-red Spectroscopy; Nitrogen Oxides; Micro-determination; Combustion; Coke; Iron Ore Sintering; Spectle Analysis; 赤外分光分析; 迅速測定; 微量分析; 分子交換膜; 鉄鋼製錬

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.

建立了定量测定少量氮氧化物及其他参与氮氧化物形成的气体的新方法。该方法适用于气态物质浓度较低且变化迅速的情况。测量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可快速消除水蒸气，从而提供宽范围的红外吸收带，并且由于目标气体的测量吸收峰不受残留水蒸气的影响，因此可以实现这一点，二氧化碳，甲烷等。该方法的主要特点如下：1）气体浓度测定软件：考虑到与目标相对应的适当吸收范围，高速计算和记录光谱数据的最佳算法气体.2) 气室体积小、光程长：采用内容积100cc、光路10m的气室。通过数学模拟优化了气室中的气体流动条件。3）应用于模拟气体和燃烧气体：使用各种标准气体混合来绘制校准曲线，然后将其应用于实际燃烧气体。结果表明该方法的有效性。