适于含碳伴生气处理的低温深冷回收工艺改进

Improvement of cryogenic recovery process suitable for carbon-containing companion

针对某天然气处理厂低温深冷工艺,采用Aspen Hysys软件设计低温萃取精馏改进工艺,进行塔板总数、原料进料位置、添加剂进料位置以及添加剂的优化。结果表明:纯组分和混合组分添加剂低温萃取精馏工艺均可实现95%纯度二氧化碳和96%纯度乙烷的双回收;以年总成本优选出的最佳低温萃取精馏工艺,与现役低温深冷工艺相比,乙烷产品的纯度提高了24.3%,年总成本降低了2.54%;设计的添加剂循环流程实现了添加剂的循环利用,虽然与现役流程相比能耗和年总成本均有所提高,但流程简便且确保乙烷产品纯度达到96%。设计的低温萃取精馏改进工艺用于CO 2驱伴生气处理是有效且高效的。

Taking the cryogenic process of a natural gas treatment plant as an example,Aspen Hysys software is used to design an improved cryogenic extractive distillation process,as well as the optimization of the total stage number,feed position,additives position and additive optimization.The results show that the cryogenic extractive distillation process with pure and mixed component additives can achieve double recovery of 95%carbon dioxide and 96%ethane.The total annual cost is the indicator used to select the optimal cryogenic extractive distillation process.Compared with the current running cryogenic distillation process,the purity of ethane product has been improved by 24.3%and the total annual cost has been reduced by 2.54%.The designed additive recycling process has realized the cycling usage of additives.Although the energy consumption and annual total cost both increase compared with the current running cryogenic distillation process,the process is simple and ensures the purity of ethane product to amount to 96%.In conclusion,the cryogenic extractive distillation process designed for processing CO 2 flooding associated gases is effective and efficient.