结合Aspen Plus模拟的真空系统工艺计算  

Process Calculation of Vacuum System Combined with Aspen Plus Simulation

作　　者：郝娜娜 张罕 HAO Nana;ZHANG Han(Xi’an Branch,Liaoning Chengbao Construction Engineering Design Co.,Ltd.,Shaanxi Xi’an 710000,China)

机构地区：[1]辽宁诚堡建设工程设计有限公司西安工程设计分公司,陕西西安710000

出　　处：《广州化工》2025年第6期178-180,188,共4页GuangZhou Chemical Industry

摘　　要：真空系统在化工计算过程中并不少见,尤其是在精馏系统中,为减少能耗经常采用真空系统,而其所要达到的真空度则需真空泵来实现。真空度除了真空泵本身的性能外,还与系统的空气泄漏量、工艺抽气量以及系统的压力损失息息相关。本文首先介绍了真空系统空气泄漏量估算的几种方法,包括根据真空系统容积、接头密长度、管件泄漏法等,或根据经验公式来计算空气泄漏量,然后以某装置精馏塔操作条件为例,结合Aspen Plus流程模拟简化计算出真空系统的抽气量及抽气速率等,模拟结果与手工计算结果比较相差无几。最后再通过判断流型来计算流导,选择合适的管径大小,并计算出真空泵的入口压力,为真空泵的选型提供更加准确的信息基础。Vacuum systems are widely utilized in chemical processes,particularly in distillation systems,to reduce energy consumption.The required degree of vacuum is achieved through vacuum pumps,which depends not only on pump performance but also on system air leakage rate,process gas throughput and pressure drop.Methods for estimating air leakage in vacuum systems were systematically evaluated,including volume-based calculations,joint sealing length analysis,pipe leakage models and empirical correlations.Taking the operational conditions of a distillation tower in a chemical plant as a case study,Aspen Plus process simulation was employed to simplify the calculation of vacuum system gas handling capacity and pumping speed.The simulation results closely matched manual calculations,validating the approach.Flow conductance was then determined by flow regime characterization to select appropriate pipe diameters and calculate vacuum pump inlet pressure,providing a precise basis for vacuum pump selection.

关 键 词：真空系统 Aspen Plus 空气泄漏量 抽气量 流导 

分 类 号：TQ051.4[化学工程]