基于工业试验结果对天然气总硫限制的技术经济分析

Technological and economic analysis on total sulfur content limitof natural gas based on industrial test results

2020年,中国宣布力争二氧化碳排放在2030年前达到峰值,2060年前实现碳中和。由于中国约80%大气污染物源于化石能源,故节能是减排二氧化碳最有效的技术措施。GB 17820—2018《天然气》发布以来,中国石油所属有关单位为达到一类气总硫限值20 mg/m 3这个气质指标,系统开展了天然气脱有机硫工艺技术的室内实验和/或工业试验,并获得了比较完整而丰富的数据。这些数据表明:20 mg/m 3这个总硫限值并不符合中国国情,对目前已经投入工业运行的3套装置进行技术经济初步分析可知,为实现此限值指标而需消耗的能量极高,与中国其它高能耗行业为实现“双碳”目标而努力开拓的技术发展方向背道而驰。鉴于以上认识,建议修订GB 17820—2018《天然气》,将一类气的总硫限值规定为50 mg/m 3,二类气总硫限值规定为150 mg/m 3。

In 2020,China announced that it would aim to achieve peak CO_(2) emissions before 2030 and carbon neutrality before 2060.Since 80%of China s air pollutants come from fossil energy,energy conservation is the most efficient measure to reduce CO_(2) emission.In the more than two years since the publication of GB 17820—2018 Natural Gas,group companies of PetroChina have systematically conducted laboratory and/or industrial plant tests on removing organic sulfur from natural gas,to meet the total sulfur content limit target of below 20 mg/m^(3) for Class 1 gas.A relatively wide ranging and complete set of data were collected from these tests.These data indicate that that the total sulfur content limit for Class 1 gas(below 20 mg/m^(3))does not suit China s national environment.A preliminary technical and economic analysis of 3 operating industrial facilities shows that energy consumption to achieve the Class 1 gas target is extremely high.This is in contradiction to the technology development trend of other high energy consumption industries in their effort to achieve the‘carbon peak emission’and‘carbon neutrality’goals.In conclusion,this paper recommends to immediately revise GB 17820—2018 Natural Gas,and set the total sulfur content limit of Class 1 gas as 50 mg/m^(3),and that of Class 2 gas as 150 mg/m^(3).