为了对国内油田伴生气进行高效回收利用,以某油田伴生气为基础,对油田伴生气回收技术方案进行研究,开发出适合于小规模油田伴生气的液化联产工艺,并对工艺进行了热力学分析及参数优化设计。基于Aspen HYSYS软件对液化联产方案进行模拟计算,对流程中特性参数脱乙烷塔压力、原料气液化温度、混合冷剂增压压力以及混合冷剂节流压力进行模拟分析。研究表明,设备的 GFDA3 损改进潜力明显,其中改进设备性能、提高系统效率最快的是压缩机,其次是换热器以及水冷器。大多数设备的可避免内源 GFDA3 损(E^AV,EN_D,K)在总 GFDA3 损中占比最高,且 GFDA3 损量大,对E^AV,EN_D,K占比多的压缩机进行改进是减小流程 GFDA3 损最有效的措施。通过减小冷箱夹点,提升脱乙烷塔 GFDA3 效率也可大幅降低流程总 GFDA3 损。水冷器的E^AV,EN_D,K和可避免外源 GFDA3 损(E^AV,EN_D,K)占比均较高,降低水冷器 GFDA3 损不仅可从自身内源 GFDA3 损入手,还可改善其他设备性能以降低空冷器 GFDA3 损。

In order to efficiently recover and utilize the associated gas in China's oilfields,the oilfield associated gas recovery technical process scheme is studied on the basis of associated gas in a certain oilfield in China,and a liquefaction co-production process suitable for small-scale oilfields is developed.Thermodynamic analysis and parameter optimization design are performed on the process.Based on Aspen HYSYS software,the simulation calculation is conducted for the liquefaction co-production process,and the characteristic parameters of the process are simulated and analyzed,including de-ethane column pressure,feedstock gas liquefaction temperature,mixed refrigerant booster pressure and mixed refrigerant throttling pressure.It is found from study that the exergy loss of equipment has obvious potential for improvement,of which the compressors are the most efficiency equipment in improving equipment performance and system efficiency,followed by heat exchangers and water coolers.For most equipment,avoidable internal exergy loss accounts for the highest proportion of overall exergy loss and is large.Therefore,to improve compressors,which accounts for a large number and proportion,is the most effective measure to reduce exergy loss in the process.Through reducing the pinch point of the cold box,the exergy efficiency of the de-ethane tower can be improved,which can greatly reduce the overall exergy loss of the process.Both exergy loss and avoidable eternal exergy loss of air coolers are relatively high.Exergy loss of air coolers can be decreased from their own internal exergy loss,and also from the performance of other equipment.

黄靖珊(1996-),女,硕士,助理工程师,从事油气储运及油气加工的设计工作,通讯联系人,1369675835@qq.com。