FTIR发射/透射光谱对含颗粒气流的温度测量  

Temperature Measurement for Particle Laden Stream by FTIR Emission/Transmission Spectroscopy

作　　者：于娟[1] 章明川[1] 赵国锋[1] 范卫东[1] 周月桂[1] 

机构地区：[1]上海交通大学能源工程系,上海200240

出　　处：《燃烧科学与技术》2003年第5期434-438,共5页Journal of Combustion Science and Technology

基　　金：国家重点基础研究发展规划资助项目(G1999022209 04);国家自然科学基金资助项目(50076025);教育部博士点基金资助项目(2000024806).

摘　　要：在改进的FTIR和自制的微量给粉加热/燃烧实验装置上,对粘土颗粒气流和煤粉火焰进行了FTIR发射/透射测量.通过发射/透射光谱可以得到颗粒温度和气体温度,其相对误差小于500,满足实验室和工业测温要求.当被测样品中存在碳黑和其它颗粒时,基于碳黑的吸收特性,给出了消除碳黑辐射影响的一种近似处理方法,即将吸收光谱外推至0cm-1,以0cm-1处的数值为准对整个光谱进行校正,所得光谱就认为是去除碳黑影响后的吸收光谱.对于CO2气体温度,研究表明,可以用通过CO2峰值的黑体理论曲线来简单估计.研究还发现炭粒温度可以高出气体温度200～300K,一个可能的原因是CO在颗粒边界层点燃引起了颗粒温度突然升高并高于气体温度,对这种现象的理论解释和更多的实验验证尚需进一步展开.Emission and transmission spectra for clay particle laden stream and pulverized coal flame were performed by using a FTIR spectrometer and a heating/combustion reactor. The particle temperature and gas temperature can be obtained through these spectra and they have relative errors of less than 5%. When soot and other particles exist in the sample, a method was given to eliminate the effect of soot radiation and approximately estimate the temperature of other particles. The particle transmittance is assumed to be equal to the measured transmittance extrapolated to 0 cm-1, where the attenuation from soot goes to zero. Study shows that CO2 temperature can be roughly evaluate by filling a black-body to the CO2 amplitude in the normalized radiance. It was also found in the present study that the char temperature can be 200-300 K. higher than the gas temperature, and the reason is possibly that CO is ignited in the particle boundary layer and causes an abrupt rise of particle temperature. More experimental and theoretical validations are needed for this phenomenon in the future study.

关 键 词：傅立叶变换红外光谱仪 发射光谱 透射光谱 温度 颗粒 

分 类 号：TK3[动力工程及工程热物理—热能工程]