石油与天然气化工2025，Vol.54Issue(3)：123-129,7.DOI:10.3969/j.issn.1007-3426.2025.03.017
天然气中总硫GC-SCD测定不确定度评定研究
Study on uncertainty evaluation of GC-SCD determination of total sulfur in natural gas
摘要
Abstract
Objective The uncertainty evaluation of actual sample measurement was carried out to provide an application case for the determination of total sulfur in natural gas using GC-SCD method,thus enhancing the practical value of the determination data.Method Combining with the practical testing experience of the GC-SCD method,the sources of uncertainty in measurement were systematically analysed at the first time.An uncertainty evaluation scheme was proposed based on the JJF 1059.1-2012 Evaluation and Expression of Uncertainty in Measurement.Result The results of the uncertainty evaluation for total sulfur determination of actual samples showed that the extended uncertainty of sample 1 was 0.19 mg/m3(k=2),mainly derived from carbonyl sulfide at 0.18 mg/m3(k=2),while the extended uncertainty of sample 2 was 0.14 mg/m3(k=2),mainly derived from hydrogen sulfide at 0.12 mg/m3(k=2).Conclusion The main sources of uncertainty in total sulfur and individual sulfur compound measurement are sample analysis repeatability and standard substances,and the uncertainty of hydrogen sulfide and carbonyl sulfide mainly contribute to the uncertainty of total sulfur.Twice repeated measurements according practical work are recommended,as increasing repeated measuring times,and using high accuracy standards are recommended to improve the level of measurement uncertainty,it is suggested to use sampling containers,pipeline valves,and other components made with sulfur-resistant adsorption materials,so as to reduce the uncertainty of hydrogen sulfide and carbonyl sulfide individual sulfur compound measurement and ensure data accuracy.关键词
天然气/总硫/硫化合物/气相色谱/不确定度Key words
natural gas/total sulfur/sulfur compound/gas chromatography/uncertainty引用本文复制引用
朱华东,曾文平,黄灵,李晓红..天然气中总硫GC-SCD测定不确定度评定研究[J].石油与天然气化工,2025,54(3):123-129,7.基金项目
中国石油西南油气田公司科学研究与技术开发项目"天然气中H2S、CO2和C4H8S新型检测管法准确检测机理及设备研究"(2024D108-01-06) （2024D108-01-06）
