为了未来的发展，液化天然气工艺处理过程中应该注意的问题毕业设计的外文翻译.doc

. PAGE . 某某学校 毕业设计（论文）外文文献翻译 （本科学生用） 题 目：为了未来的发展，液化天然气工艺处理过程中应该注意的问题 学 生 姓 名： 学号： 学 部 （系）:城市建设工程学部 专 业 年 级:级建筑环境与设备工程班 指 导 教 师： 年月日 LNG PROCESS SELECTION CONSIDERATIONS FOR FUTURE DEVELOPMENTS John B. Stone Senior LNG Consultant Dawn L. Rymer Senior Engineering Specialist Eric D. Nelson Machinery and Processing Technology Supervisor Robert D. Denton Senior Process Consultant ExxonMobil Upstream Research Company Houston, Texas, USA ABSTRACT The history of the LNG industry has been dominated by the constant search for economies of scale culminating in the current Qatar mega-trains undergoing final construction, commissioning,start-up and operations. While these large trains are appropriate for the large Qatar gas resources, future, smaller resource developments will necessitate different process selection strategies. The actual LNG process is only one of many factors affecting the optimal choice. The choice of equipment, especially cryogenic heat exchangers and refrigerant compressors, can overwhelm small differences in process efficiencies. ExxonMobil has been developing a dual mixed refrigerant (DMR) process that has the potential of offering the scalability and expandability required to meet the needs of new project developments, while also maximizing the number of equipment vendors to allow broader competition and keep costs under control. The process will also have the flexibility to accommodate a wide range of feed compositions, rates, and product sales requirements. BACKGROUND The startup of the 7.8 million tonnes per year (MTPA) trains in Qatar mark the most recent pinnacle in the search for economies of scale in the LNG industry. However, theapplication of these very large trains for general LNG applications is very limited. To produce this amount of LNG requires ~42 MSCMD (1500 MSCFD) of feed gas. What is often overlooked in the discussion of large LNG trains is that a resource of about 370 GCM (13 TCF) is needed to suppo