摘要天然气在液化过程中需深冷至约-162℃,为了避免在低温液化过程中因结冰堵塞设备和管线,需对天然气中的酸性组分进行深度脱除。介绍了LNG工厂中原料天然气预处理工艺中的重点单元—脱硫脱碳单元的技术路线,阐述了中国石油西南油气田公司天然气研究院自主研发的CT8-23活化MDEA溶剂及CT8-25深度脱硫脱碳脱有机硫溶剂的性能及技术特点,并与国外同类溶剂Sulfinol-D的性能进行了对比。结果表明,在吸收压力仅为2MPa、吸收塔塔板数为13块的条件下,CT8-25溶剂对H2S、CO2均可达到深度脱除的要求,且对有机硫的脱除率高出Sulfinol-D约28%。It is necessary to cool natural gas to about -162 ℃ during the liquefaction process . In order to avoid freezing plugging of the equipment and pipelines during the cryogenic liquefac-tion process ,the acidic components of natural gas should be removed deeply .The key process technology of feed gas pretreatment unit for LNG plant ,which includes desulfurization and de-carbonization is mainly introduced .The characteristics and technical advantages of CT 8-23 activa-ted MDEA solvent and CT8-25 solvent ,which can deeply remove the H2S ,CO2 and organic sul-fur ,are described .Both of the solvents have been developed independently by Research Institute of Natural Gas Technology ,PetroChina Southwest Oil & Gasfield Company .Compared to simi-lar foreign solvents Sulfinol-D ,the results show that CT 8-25 solvent can removal H2 S ,CO2 deep-ly to reach the requirements .When the absorption pressure is 2 MPa ,the plate number of ab-sorber is 13 ,and the removal rate of organic sulfur is 28% higher than Sulfinol-D .
基金中国石油天然气股份有限公司重大专项"天然气液化关键技术研究"专题一"天然气深度预处理工艺技术研究"(2009E-1901)
