引用本文:刘可,王向林,袁庆洪,梁莉,余军,杨威. 高酸性天然气脱硫脱碳工艺技术研究[J]. 石油与天然气化工, 2020, 49(3): 14-20.
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高酸性天然气脱硫脱碳工艺技术研究
刘可1,2,王向林3,袁庆洪4,梁莉1,2,余军1,2,杨威1,2
1.中国石油西南油气田公司天然气研究院 ;2.国家能源高含硫气藏开采研发中心 ;3.中国石油西南油气田公司重庆天然气净化总厂 ;4. 中国石油西南油气田公司燃气工程研究所
摘要:
针对原料气中H2S和CO2摩尔分数均达到20%的高酸性天然气净化,通过工艺模拟计算结合室内实验评价的手段,筛选出一种具有良好脱硫性能、选择性及高酸气负荷的选择性脱硫溶剂CT8-5。通过室内实验进行工艺优化后,提出了包括气液比、吸收塔塔板数、贫液温度、再生温度等在内的一系列工艺参数。结果表明,在气液比为200的条件下,净化气中H2S质量浓度为3.9 mg/m3,CO2摩尔分数为1.86%,完全能满足GB 17820-2018《天然气》国家标准中对商品气的气质要求。对GB 17820-2018发布实施后高酸性天然气处理所面临的问题进行了探讨,提出了建议,可为高酸性天然气的气质达标处理提供技术思路。 
关键词:  高酸性天然气  GB 17820-2018  醇胺法  脱硫脱碳  有机硫  工艺优化
DOI:10.3969/j.issn.1007-3426.2020.03.003
分类号:
基金项目:中国石油天然气股份有限公司重大科技专项“西南油气田天然气上产300亿立方米关键技术研究与应用——四川盆地气田开发地面系统安全清洁高效运行关键技术研究与应用”(2016E-0610)
Research on desulfurization and decarbonization process of highly sour natural gas
Liu Ke1,2, Wang Xianglin3, Yuan Qinghong4, Liang Li1,2, Yu Jun1,2, Yang Wei1,2
1. Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, China;2.National Energy Research Center of High Sulfur Content Gas Reservior, Chengdu, Sichuan, China;3. Chongqing Natural Gas Purification Plant General, PetroChina Southwest Oil & Gasfield Company, Chongqing, China;4. Gas Engineering Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, China
Abstract:
Aiming at the desulfurizing and decarbonizing of highly sour natural gas with H2S and CO2 molar fraction all up to 20%, a kind of selective desulfurization solvent CT8-5 was screened via process simulation calculation combined with laboratory experiment evaluation. The CT8-5 solution has better desulfurizing capability, selectivity and higher sour gas load. The process was optimized by laboratory experiment and a series of process parameters containing gas-liquid ratio, plate number of absorber, lean solution and regeneration temperature were put forward. The results showed that on the condition of gas-liquid ratio was 200, the H2S mass concentration in purified gas was 3.9 mg/m3 and CO2 molar fraction was 1.86%, which could completely meet the quality requirements of commodity gas in the national standard of GB 17820-2018 Natural Gas. Facing problems of treating highly sour natural gas were discussed and some suggestions were put forward, which could provide technical ideas for the treatment of highly sour natural gas to reach the standard of GB 17820-2018.
Key words:  highly sour natural gas  GB 17820-2018  alcohol amine process  desulfurization and decarbonization  organic sulfide  process optimization