A new gas chromatography method for continuous monitoring of non-methane hydrocarbons as an analogy of volatile organic compounds in flue gas

Chieh Heng Wang, Hsi Che Hua, Wei Chuan Lin, Hsin Cheng Hsieh, Jia Lin Wang

研究成果: 雜誌貢獻期刊論文同行評審

4 引文 斯高帕斯(Scopus)

摘要

A new on-line method of monitoring the total non-hydrocarbons (TNMHC) from the flue or waste gas of stationary sources, which significantly improves upon the current method commonly used in both Taiwan and China, is described. The major problem with the current method is that higher-boiling-point compounds in the waste gas saturate porous materials within the molecular-sieve column used to immobilize TNMHC and elute methane, which sabotages the fixability of TNMHC and leads to false methane and TNMHC readings during continuous monitoring. Our new method effectively circumvents this issue by incorporating a dual-column and back-flush design, rendering it a true gas chromatography (GC) method. Applying this GC method, light hydrocarbons, such as methane, ethane, and propane, can be fully separated by the dual column set. After methane enters the analytical column, a reverse carrier flow immediately back-flushes the pre-column while keeping the analytical column flowing forward by a second flow of the carrier gas for eluting methane. The field application, particularly upon repeated analyses of flue gas laden with complex and elevated levels of volatile organic compounds (VOCs), has shown that self-cleaning by back-flush is necessary when operating at a constant oven temperature.

原文???core.languages.en_GB???
頁(從 - 到)2913-2921
頁數9
期刊Aerosol and Air Quality Research
18
發行號12
DOIs
出版狀態已出版 - 12月 2018

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