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Conceptual process design and simulation of membrane systems for integrated natural gas dehydration and sweetening

机译：综合工艺设计与膜系统综合天然气脱水和甜味仿真

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摘要

Subsea natural gas processing attracts increased interest due to the smaller environmental footprint. Natural gas (NG) dehydration and sweetening are the main processing steps to avoid pipeline plugging and corrosion caused by the presence of water and CO2. Triethylene glycol (TEG) and amine absorption are the commercial technologies for these applications. However, membrane technology is considered as promising solutions for alternative subsea gas processing technologies, which provides unmanned operations without the requirements for rapidly periodical maintenance. In this work, a hybrid membrane process was designed for integrated dehydration and sweetening of a saturated natural gas containing 10 mol% CO2, and the process operating parameters such as inter-stage feed and permeate pressures are investigated. The simulation results indicated that the optimal permeate pressure in the 2nd -stage unit is 4 bar, and the optimal 3rd-stage feed and permeate pressures arel 5bar and 2 bar, respectively. The minimum specific cost of < 2.71 x 10(-3) $/m(3) sweet natural gas was estimated to achieve the separation requirement of < 2.5 mol% CO2 in purified NG together with captured high purity CO2 (> 95 mol%) for enhanced gas recovery. However, due to the relatively low water selectivity of the dehydration membranes at high pressure of 60 bar used in the simulation, the hydrocarbon loss is still quite higher. Thus, advanced membranes with high H2O/CH4 selectivity at high pressure should be pursued to promote the application of the designed membrane system for subsea natural gas dehydration and sweetening.
机译：由于环境足迹较小，海底天然气处理吸引了较高的兴趣。天然气（NG）脱水和甜味是主要的加工步骤，以避免水和二氧化碳存在引起的管道堵塞和腐蚀。三甘醇（TEG）和胺吸收是这些应用的商业技术。然而，膜技术被认为是替代海底天然气加工技术的有希望的解决方案，其提供无人驾驶运营，而无需快速定期维护。在这项工作中，设计了杂交膜过程，用于含有10mol％CO 2的饱和天然气的集成脱水和甜味，并研究了诸如阶段间进料和渗透压力的过程操作参数。模拟结果表明，第二级单元中的最佳渗透压力为4巴，最佳的第3级进料和渗透物压力架5bar和2巴。估计<2.71×10（-3）$ / m（3）甘油天然气的最小特定成本估计纯化的Ng中<2.5mol％CO 2的分离要求与捕获的高纯度CO 2（> 95mol％）用于增强的气体回收。然而，由于在模拟中使用的60巴的高压下脱水膜的水选择性相对较低，烃损失仍然更高。因此，应追求高压H2O / CH4选择性的高级膜，以促进设计的膜系统以进行海底天然气脱水和甜味。

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