气液聚结器的尺寸估算

Size Estimation of Gas-Liquid Coalescer

在天然气工程项目中,气液聚结器一般设置在对天然气质量要求较高的装置前,如分子筛脱水塔和脱硫吸收塔的入口,用于脱除气相中微小颗粒或液滴,以保证下游设备和装置的平稳运行。气液聚结器设计选型至关重要,合适的气液聚结器能有效地降低设备磨损和维修费用,其设计选型一般由制造厂家根据进口流体参数和脱出液滴大小来计算,国内文献尚无通用的估算方法,外文文献有关于气液聚结器选型的计算原理,但部分关键参数未能详尽说明,尚不能应用于工程项目。结合海外工程项目的设计经验,借鉴外文文献中的计算思路,通过计算表观滤速、环形速度、系统压降来估算气液聚结器的尺寸,并总结出具体估算步骤。经工程实例验证,该方法可用于工程项目设计各阶段气液聚结器的尺寸估算。

In engineering projects of natural gas, the gas- liquid coalescer is normally set at the upstream of equipment that is particularly sensitive to contamination, such as the inlet of molecular sieve dehydration towers and absorbers of desulfurizer, to remove tiny little particles or droplets entrained in gas phase in order to protect downstream equipment and ensure the stable operation of the device. The design and type- selection of gas- liquid coalescer are crucial. The appropriate gas- liquid coalescer can effectively reduce equipment wear and maintenance costs. The design and type- selection of gas- liquid coalescer are generally calculated by the manufacturer in accordance with the parameters of inlet fluid and the droplet size removed. No universal estimation method is available in domestic literature. There is the calculation principle about the design and type- selection of gas- liquid coalescer in foreign literature, but some key parameters have no detailed description and cannot be used in engineering projects. Combined with the design experiences of overseas engineering projects and using the calculation idea of foreign literature for reference,the size of gas-liquid coalescer is estimated by calculating superficial filtration velocity, annular velocity and system pressure drop, and specific steps are summarized. Through project cases,it is verified that the method can be used to estimate sizes at every stage of engineering project.