被动傅里叶变换红外(FTIR)光谱技术具有远程操作、在线分析和不需要 红外光源等优点。基于此技术 分析了被动遥测轧钢加热炉内燃烧过程中高温一氧化碳(CO)气体浓度计算的相关理论与方法。针对加 热炉辐射光谱测量包含两层均质红外辐射传输介质的情况,提出了采用炉膛外壁控温改变遥测背景红外辐 射,从而获得炉内CO特征光谱的方法。基于轧钢过程中的燃烧工况进行了CO浓度模拟计算与分析,讨论了CO温 度测量误差对测量浓度反演精度的影响,为该技术的实际应用提供了参考数据及技术方案。

Passive Fourier transform infrared (FTIR) technology has the advantages of remote operation, on-line analysis and no need for infrared light source etc. Based on the technology, the theory and method of calculating concentration of carbon monoxide (CO) gas at high temperature during combustion in rolling furnace of steel are analyzed. Aiming at the situation that radiation spectral measurement of heating furnace consists of two-layers homogeneous infrared radiation transfer medium, a method of changing the infrared radiation of remote sensing background by temperature control on the outside wall of furnace is proposed to obtain the characteristic spectrum of CO in furnace. Based on the combustion condition in rolling process, CO concentration simulation and analysis are carried out, and the effects of CO temperature measurement error on accuracy of measurement concentration inversion are discussed. The reference data and technical scheme are provided for the practical application of this technology.