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现场天然气的温度、压强影响利用光谱数据进行定量分析的精度,对一定浓度甲烷气体的傅里叶红外光谱图随气体温度和总压强的变化规律进行了实验研究。结果表明,温度、总压强和光谱数据之间有很好的线性关系,所建温度PLS预测模型,相关系数高达0.9998,校正均方根误差(RMSEC)为0.658,验证均方根误差(RMSEP)为0.951,相对误差不超过2.79%;在一定范围内,谱带吸收强度和峰宽随温度(气体体积不变)、总压强的升高而增大,峰面积的增加量与温度、压强增加量近似成正比。
The temperature and pressure of natural gas affect the accuracy of quantitative analysis by using spectral data. The experimental results of Fourier transform infrared spectroscopy (FTIR) spectroscopy of gas with certain concentration on the variation of gas temperature and total pressure have been carried out. The results showed that there was a good linear relationship between temperature, total pressure and spectral data. The correlation coefficient was as high as 0.9998 and the root mean square error of correction (RMSEC) was 0.658. The root mean square error of validation (RMSEP) Is 0.951, the relative error is no more than 2.79%. Within a certain range, the absorption intensity and peak width of the band increase with the increase of temperature (gas volume) and the total pressure. The increase of peak area and the increase of temperature and pressure The amount is approximately proportional.