减压转油线气液两相流动的流程模拟  

PROCESS SIMULATION AND ANALYSIS OF TWO-PHASE FLOW IN VACUUM TRANSFER LINES

作　　者：许孝玲 刘子楠 刘艳升 Xu Xiaoling;Liu Zinan;Liu Yansheng(State Key Laboratory of Heavy Oil Processing,China University of Petroleum(Beijing) at Karamay,Karamay,Xinjiang 834000;State Key Laboratory of Heavy Oil Processing,China University of Petroleum(Beijing))

机构地区：[1]中国石油大学(北京)克拉玛依校区重质油国家重点实验室,新疆克拉玛依834000 [2]中国石油大学(北京)重质油国家重点实验室

出　　处：《石油炼制与化工》2021年第3期93-98,共6页Petroleum Processing and Petrochemicals

摘　　要：应用流程模拟软件PROⅡ,基于压降模型和多级闪蒸模型,对减压蒸馏装置转油线(简称减压转油线)内的气液两相流动过程进行模拟,预测转油线中的压力、温度以及油气汽化率和气液体积比的变化。结果表明:压降、温降以及油气汽化率和气液体积比的变化主要发生在转油线的过渡段和衔接处;与高速转油线工况相比,低速转油线工况下的压降和温降均明显降低;在减压塔内油气汽化率一定的条件下,低速转油线工况下的入口温度更低,且能量的传递效率更高;同时,低速转油线工况下的油气汽化率和气液体积比的变化较为缓和,更有利于减少减压蒸馏塔进料段的雾沫夹带。所建模型的预测结果与工业数据较为一致。The modeling of two-phase flow was analyzed by using process simulation software PROⅡwith the aim of predicting the distributions of pressure,temperature,evaporation rate as well as volumetric ratio of vapor to gas(VG/VL)in a vacuum transfer line.The model was developed based on the pressure drop model and the multi-stage flash model.The results indicated that the pressure drop,temperature decline,the variation of evaporation rate and VG/VL primarily occurred in the transition section and the junction site of the transfer line.In comparison with the high-velocity transfer line,the pressure and temperature decline was clearly higher in the case of the low-velocity transfer line.In the premise of the evaporation rate at the outlet of transfer line remaining approximately the same,the temperature at the inlet of transfer line was lower in the case of the low-velocity transfer line,which means more efficient energy transfer.Meanwhile,the low-velocity transfer line offered more moderate change of evaporation rate and VG/VL,in favor of decreasing the amount of liquid entrainment at the feed section of a vacuum tower.Furthermore,the predictions were in good agreement with the industrial field data in the case of the low-velocity transfer line,which verified the reliability of the model.

关 键 词：减压蒸馏 转油线 流程模拟 两相流动 压降 汽化率 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]