煤气化装置缓冲筒磨蚀问题的数值模拟研究  

Numerical simulation of buffer cylinder abrasion in coal gasification unit

作　　者：李文盛 陈洁净 李群 LI Wensheng;CHEN Jiejing;LI Qun(SINOPEC Ningbo Engineering Co.,Ltd.,Ningbo 315103,China)

机构地区：[1]中石化宁波工程有限公司,浙江宁波315103

出　　处：《石油化工腐蚀与防护》2024年第3期1-5,共5页Corrosion & Protection In Petrochemical Industry

基　　金：中国石化科技开发项目“煤化工装置高压管道耐磨耐蚀涂层开发与应用”(NEBF220066)。

摘　　要：煤气化闪蒸系统因存在高固含量物料,导致管道磨蚀/冲蚀问题较为突出,已严重制约装置的正常运行。以低压闪蒸罐至真空闪蒸罐角阀后的缓冲筒为研究对象,通过几何建模和仿真分析,探讨该部位缓冲筒内流体的流动特性,并对磨蚀/冲蚀严重部位进行预测。研究结果表明,磨蚀/冲蚀最严重区域位于三通相贯线处,随着入口速度增加,最大冲蚀率呈指数型上升趋势,磨蚀/冲蚀区域不断扩展;流体在缓冲筒盲端区域产生低速涡旋运动,对缓冲筒壁面冲蚀有一定的缓冲作用,且随着入口速度的增加,缓冲筒盲端缓冲区高度逐渐减小,对盲端底部的缓冲作用逐渐减弱。Due to the presence of materials with high solid content in the coal gasification flash system,the problem of pipeline abrasion/erosion was more prominent,which seriously hindered the normal operation of the unit.Through geometric modeling and simulation analysis,flow characteristics of the fluid inside the buffer cylinder from the low-pressure flash tank to the angle valve of the vacuum flash tank were explored,and the severe abrasion/erosion areas were predicted.The research results indicated that the area with the most serious abrasion/erosion was located at intersection of the tee;as the inlet velocity increased,the maximum erosion rate accelerated exponentially and the abrasion/erosion area expanded continuously;low-speed vortex was generated in the blind end area of the buffer cylinder,which had a certain buffering effect on the erosion of the buffer cylinder wall;with the raise of inlet velocity,the height of the blind end buffer zone of the buffer cylinder slowly decreased,then buffering effect on the bottom of the blind end gradually weakened.

关 键 词：煤气化 缓冲筒 磨蚀 冲蚀 数值模拟 

分 类 号：TQ545[化学工程—煤化学工程]