真空脱水技术在乙二醇再生回收系统脱水单元的应用探索

Application Exploration of Vacuum Dehydration Technology in Ethylene Glycol Regeneration System

贫乙二醇含水量是衡量乙二醇再生回收技术水平的重要指标之一。随着海洋天然气的勘探和开发进程加快,乙二醇再生的方式也从常压脱水向更节能的真空脱水方向发展。以某深水天然气开采平台配置的乙二醇再生回收系统为研究对象,针对乙二醇脱水过程中出现的重沸器热量供给不足、重沸器结垢、海水出水温度过高等一系列问题,提出真空脱水技术应用改造方案,并对脱水单元主要设备进行了刚度和失稳校核。改造实施后的现场试运行结果表明,真空脱水技术在乙二醇再生回收系统脱水单元中具有重要的应用价值和显著的节能效果,预计节能量可达1267.47 tce/a,是乙二醇再生回收技术改进的有益探索。

The water content of ethylene glycol is one of the important indicators to measure the level of ethylene glycol regeneration and recovery technology.With the acceleration of exploration and development of marine natural gas,the method of ethylene glycol regeneration has also shifted from atmospheric pressure dehydration to more energy-efficient vacuum dehydration.The ethylene glycol regeneration and recovery system configured on a certain deepwater natural gas extraction platform is taken as the research object.In response to a series of problems that occur during the ethylene glycol dehydration process,such as insufficient heat supply to the reboiler,scaling in the reboiler,and high seawater outlet temperature,a vacuum dehydration technology application and transformation plan is proposed.The stiffness and instability of the main equipment of the dehydration unit are checked.The on-site trial operation results after the renovation implementation indicate that vacuum dehydration technology has important application value and significant energy-saving effect in the dehydration unit of ethylene glycol regeneration and recovery system.It is expected to save energy up to 1267.47 tce/a,which is a beneficial exploration for the improvement of ethylene glycol regeneration and recovery technology.