微型热导检测器气相色谱法在天然气总硫含量测定中的应用

Application of gas chromatography with micro thermal conductivity detector in determination of total sulfur content in natural gas

关键词:  天然气  微型热导检测器  气相色谱法  硫化合物  总硫含量

Key words:  natural gas  micro thermal conductivity detector  gas chromatography  sulfur compounds  total sulfur content

摘要:

建立了微型热导检测器(μTCD)气相色谱法测定天然气中总硫含量的方法。在优化的实验条件下,评价了方法的可靠性,探讨了分析方法的有效性、重复性、准确性和烃类组分对待测目标物的影响,在天然气气质组分不含丁烷及以上组分的条件下,方法的定性重复性(色谱峰保留时间的相对标准偏差)≤0.3%,定量重复性(测量结果的相对标准偏差)≤2%,准确性的分析偏差≤5%,不同测量方法的比对结果满足GB/T 11060.8-2020总硫测定方法仲裁标准中再现性的要求。μTCD气相色谱法与常规气相色谱仪相比,具有灵敏度高、分析周期短、操作简便、运行成本低等特点,容易实现在线检测,对于气质组分中不含丁烷及以上组分时,该方法优势显著。 

Abstract:

A method for the determination of total sulfur content in natural gas by gas chromatography with micro thermal conductivity detector was established. Under the optimized experimental conditions, the reliability of the method was evaluated, and the effectiveness, repeatability, accuracy of the analysis method and the influence of hydrocarbon components on the target were discussed. The qualitative repeatability (relative standard deviation of retention time of chromatographic peak) was less than 0.3%, and quantitative repeatability (relative standard deviation of measurement results) was less than 2%, and the analysis deviation of accuracy is less than 5%. The comparison results of different measurement methods meet the requirements of reproducibility limit in the arbitration standard for determination of total sulfur in GB/T 11060.8-2020. Compared with the conventional gas chromatograph, gas chromatography has the advantages of high sensitivity, short analysis period, simple operation and low operation cost. It is easy to realize on-line detection. When butane and above components are not contained in the gas components, this method has obvious advantages.