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    题名: 氣相層析線上數據擷取共同平台之開發與測試
    作者: 范綱捷;Fan,Kang-Chieh
    贡献者: 化學學系
    关键词: 氣相層析儀;火焰離子偵測器;線上連續監測;LabVIEW;Gas Chromatography;Flame Ionization Detector;On-line Monitoring System
    日期: 2014-08-22
    上传时间: 2014-10-15 14:39:21 (UTC+8)
    出版者: 國立中央大學
    摘要: 有鑑於目前商品化氣相層析儀(Gas Chromatograph, GC)之操作軟體無論在使用或是數據呈現方式大都僅適合批次分析方式作業,若用在線上連續方式操作會產生諸多不便,因此本研究嘗試以LabVIEW程式語言開發出獨立之GC操作軟體,用於線上氣體分析。完成後的GC設備能夠將監測工作從最初的樣品進樣、資料擷取、層析峰積分、至最終數據呈現等功能能夠在此獨立之平台下完成,使現場作業人員能夠更簡便的操作,並可即時獲知各氣體濃度的即時資訊與逐時演變,如此便能輕易的將實驗室型態之氣相層析儀轉型成為工業型態之氣體監測設備。
    本研究將此GC操作軟體應用在兩種分析方法上,第一種應用為生質氣體線上試驗系統,以甲丙烷混和標氣為監測對象,搭配火焰離子偵測器為偵測方法,並且與安捷倫商業化軟體ChemStation做數據平行比對。結果顯示,自動層析軟體可以成功自動完成一系列樣品進樣、訊號擷取、層析峰積分、資料儲存及濃度數據呈現等功能。甲烷以及丙烷之相關係數(R2)皆可達0.9991以上,各個檢量點之相對標準偏差(Relative standard deviation, RSD)皆可達1%以下。與商業化軟體平行比對方面數據之相關係數(R2)皆可達0.87以上。
    第二種應用為排放管道線上連續監測總碳氫(total hydrocarbons, THC)與總非甲烷總碳氫化合物(total non-methane hydrocarbons, tNMHCs),使用火焰離子偵測器作為偵測方法,可在單次分析同時獲得THC、甲烷、以及tNMHCs濃度資訊。結果顯示,檢量線中甲烷的相關係數(R2)為0.9885,各個檢量點之相對標準偏差達2.4%以下,丙烷的之相關係數(R2)皆可達0.999,各個檢量點之相對標準偏差達3.4%以下。
    ;In light of the limitations with the control softwares of the commercial gas chromatographs (GCs), which are mostly suited for batch analysis in the laboratories, independent GC control softwares through the use of a system-design platform (LabVIEW) were developed. The as developed GC softwares can repeat the analytical cycle of sampling, data acquisition, peak integration, concentration calculation and data display, so that an operator can easily obtain gas concentrations in real-time when used as an on-line industrial gas analyzer.
    To test the control softwares, two applications were attempted. In the first, the control software was designed for a GC system equipped with flame ionization detection (FID) to on-line monitor a syngas production process. Both methane and propane in a standard mixture at ppm level was continuously analyzed. The results were compared with the same GC but using a commercial control software for comparison. Synchronous results between the self-developed and the commercial software by measuring the two gases in ambient air were obtained with R2 better than 0.87. Linearity (R2) resulting from the calibration curves of the two gases were better than 0.9991. The analytical precision expressed by the relative standard deviation (RSD) was better than 1% for each calibration point for the two gases.
    In the second application, a software was designed for a GC-FID system to on-line monitoring of total hydrocarbons (THC) and total non-methane hydrocarbons (tNMHCs) from stacks. The results showed that the correlation coefficients (R2) for methane’s and propane’s calibration curves were 0.9885 and 0.999, respectively, and the RSDs for each calibration point were 2.4% and 3.4%, respectively.
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