摘要
从质量要求和检测方法的变化两个角度对GB 17820-2018《天然气》新标准进行了研究,并指出新标准待完善之处。新标准中只包括高位发热量、总硫(以硫计)、硫化氢、二氧化碳等4项检测项目,删掉了水露点检测项目。新标准中一类气和二类气的质量要求发生很大改变,检测项目的质量要求发生改变,其中,一类气的高位发热量的要求下限值由36MJ/m^3降低至34MJ/m^3,总硫含量要求的上限值由60mg/m^3降低至20mg/m^3,二氧化碳摩尔分数要求的上限值由2%提高至3%。新标准丰富和扩充了各项目的检测方法,方法的选择性增多,同时对各检测项目的仲裁试验方法进行了规定,变化最大的是总硫的仲裁试验方法由氧化微库仑法变更为紫外荧光法。结合实际应用建议给出具体的水/烃露点质量要求指标及具体的检测方法。
The new GB 17820-2018 natural gas standard is interpreted in detail from the perspectives of quality requirements and changes in testing methods,and the new standard is pointed out to be improved.In the new standard,only four items,including high calorific value,total sulfur(measured by sulfur),hydrogen sulfide and carbon dioxide,were included,the dew point detection item was deleted.In the new standard,the quality requirements of the first and second class gases are greatly changed,and the quality requirements of testing items are changed.Among them,the required lower limit of the high calorific value of a kind of gas is reduced from 36 MJ/m^334 MJ/m^3,the upper limit for total sulfur content is reduced from 60 mg/m^3 to 20 mg/m^3,and the upper limit for the mole fraction of carbon dioxide is increased from 2%to 3%.The new standard enriches and expands the detection methods of various items,and the selectivity of the methods increases.At the same time,the arbitration test method of each test item is specified,and the biggest change is that the arbitration test method of total sulfur is changed from oxidation microcoulomb method to ultraviolet fluorescence method.At last,it is suggested to give the specific water/hydrocarbon dew point quality requirements and specific detection methods.
出处
《计量与测试技术》
2019年第11期36-39,共4页
Metrology & Measurement Technique
