无机盐工业 ›› 2022, Vol. 54 ›› Issue (5): 38-46.doi: 10.19964/j.issn.1006-4990.2022-0030
收稿日期:
2022-01-17
出版日期:
2022-05-10
发布日期:
2022-05-31
作者简介:
严硕(1984— ),女,博士,研究方向为膜材料及膜分离工艺研究;E-mail:基金资助:
YAN Shuo(),YU Haibin,CHEN Zan(
)
Received:
2022-01-17
Published:
2022-05-10
Online:
2022-05-31
摘要:
综述了目前膜法脱除天然气中二氧化碳的工艺技术发展现状。首先对比了天然气脱除二氧化碳多种工艺技术特点及应用场合情况,膜分离法相比于其他分离方法,具有投资较少、占地小、耗能少等优势。介绍了膜法分离原理、膜材料、膜组件发展现状和膜法脱除天然气中二氧化碳工艺技术单元情况。而工艺技术单元又分为预处理单元和膜分离单元:预处理单元根据采出原料气成分选择不同脱除方法进行组合;原料气经预处理单元后进入膜分离单元,根据实际工况,综合考虑烃类回收率、占地、能耗、投资等因素合理地设计膜法脱碳分离工艺。然后又对国内外膜法脱除天然气中二氧化碳应用案例进行介绍,目前国外膜法脱除天然气中二氧化碳应用案例较多,而国内应用案例较少,因此需加大国内膜法脱除天然气中二氧化碳的工业应用。最后对天然气膜法脱除二氧化碳技术发展方向进行了展望,指出研发具有自主知识产权并且在实际复杂工况条件下能保持高性能、长周期稳定性的膜材料是未来膜分离技术发展的重点,同时将两种或两种以上的单一脱除二氧化碳技术相结合的耦合集成组合工艺,如膜法分离+化学吸收法、膜法分离+变温吸附法等,这种耦合集成组合工艺为未来脱碳工艺技术发展提供了新方向。
中图分类号:
严硕,于海斌,陈赞. 膜法脱除天然气中二氧化碳的工艺技术发展现状[J]. 无机盐工业, 2022, 54(5): 38-46.
YAN Shuo,YU Haibin,CHEN Zan. Technology development status of carbon dioxide removal from natural gas by membrane process[J]. Inorganic Chemicals Industry, 2022, 54(5): 38-46.
表1
低温分离以及吸附分离、吸收法及膜分离法分离原理、特点及应用场合对比[16]
吸收分离法 | 吸附分离法 | 低温分离法 | 膜分离法 | |
---|---|---|---|---|
分离原理 | 根据混合物中各组分在吸收剂中物理溶解度或化学反应活性不同而将混合物中一种或多种物质吸收而达到分离的目的。 | 吸附法是利用多孔性的固体吸附剂将混合物中的一种或数种组分吸附于表面,再用适宜溶剂、加热或吹气等方法将预测组分解吸,达到分离和富集的目的。 | 通常采用机械方法,如用节流膨胀或绝热膨胀等方法,把气体压缩、冷却后利用不同气体沸点上的差异进行精馏,使不同气体得到分离。 | 利用膜的选择透过性能将混合物中某一组分从混合物中分离出来的过程。 |
特点 | 1)系统较复杂、设备较多、吸收塔高、占地面积大;2)对CO2脱除精度较高;3)存在能量消耗 大、需定期补充吸收液、环境污染等问题。 | 1)净化度高、工艺简单、无三废排 出;2)适用于小处理量场合;3)吸 附剂需要定期更换;4)吸附剂用 量大、设备罐体多、吸附解吸频繁、 自动化程度要求高。 | 1)工艺复杂;2)大幅度降温导致耗能高。 | 1)尺寸小、重量轻、有利于节省平台面积,适合海上应用;2)流程简单、一次性投资少、操作弹性大;3)维护、操作工作量小;4)膜组件需要定期更换;5)国内应用案例尚少。 |
应用 场合 | 低含量CO2脱除的主要方法。 | 常用于CO2含量不高的小型天然气液化处理装置的预处理。 | 适用于CO2脱除深度较高的场合(但能耗高)。 | 适用于设备尺寸、重量受限,CO2脱除深度要求适中的场合。 |
表3
膜气体分离应用、公司及产品、膜材料和膜组件的类型[26]
应用场合 | 公司及产品 | 膜材料 | 膜组件类型 |
---|---|---|---|
CO2/CH4、H2/CH4、He/CH4 | UOP,Honeywell (Separex?,PolySep?) | 醋酸纤维素、其他 | 螺旋卷式、 中空纤维式 |
CO2/CH4 | Cameron(Cynara?) | 三乙酸纤维素 | 中空纤维式 |
CO2/CH4、H2/CH4、O2/N2 | Ube | 聚酰亚胺 | 中空纤维式 |
H2分离、O2/N2 | Air Products(PRISM?) | 聚砜 | 中空纤维式 |
H2分离、O2/N2 | Air Liquide(MEDAL?) | 聚酰亚胺/芳纶 | 中空纤维式 |
O2/N2 | Generon IGS | 四溴聚碳酸酯 | 中空纤维式 |
蒸汽/天然气、其他 | MTR | 硅橡胶、其他 | 螺旋卷式 |
蒸汽/天然气、空气脱水 | GKSS | 硅橡胶 | 板框式、 螺旋卷式 |
CO2/CH4、沼气 | Evonik(SEPURAN?,SEPURANNG?) | 聚酰亚胺 | 中空纤维式 |
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