煤气化炉出口合成气携灰对管道冲蚀的数值模拟研究  

Study Using Numerical Simulation for Erosion in Piping Caused by Ash-carrying Synthesis Gas from Outlet in Coal Gasifier

作　　者：史泽洋 黄志雄 蔺俊龙 高智德 林海萍 李玉阁 宋文明 闫渊 吴峰[1] 魏利平[1] Shi Zeyang;Huang Zhixiong;Lin Junlong;Gao Zhide;Lin Haiping;Li Yuge;Song Wenming;Yan Yuan;Wu Feng;WEI Liping(School of Chemical Engineering,Northwest University,Xi'an 710069,China;Anqing Branch of Sinopec,Anqing 246000,China;Shanghai LANYA Petrochemical Equipment Testing Institute Co.,Ltd,Shanghai 201518,China)

机构地区：[1]西北大学化工学院,陕西西安710069 [2]中国石油化工股份有限公司安庆分公司,安徽安庆246000 [3]机械工业上海蓝亚石化设备检测所有限公司,上海201518

出　　处：《化工设备与管道》2022年第6期89-95,共7页Process Equipment & Piping

基　　金：国家自然科学基金面上项目(NO.22278332);中石化《壳牌粉煤气化装置腐蚀风险防控技术研究》(32000000-21-ZC0613-0020)项目;陕西秦创源“科学家和工程师”团队建设项目(No.2022KXJ-041)。

摘　　要：在壳牌粉煤气化工艺中,粉煤高温高压进入气化炉反应生成合成气和带有黏性的灰分,附着在管道内壁面,合成气携带灰分经过管道弯头时,流向发生改变,进而造成弯头处冲蚀,弯头的冲蚀现象很大程度影响着煤气化出口合成气管道运输的安全性。为研究弯头腐蚀的影响因素,研究采用流体动力学(CFD)的研究方法,建立气-固两相流模型,通过模拟合成气和煤粉颗粒在管道中的输送工况,根据模拟结果分析并讨论不同的管道弯头角度以及入口气速对管道冲蚀的影响。模拟结果表明,弯头的角度、入口气速等因素均会影响管道的冲蚀,135°弯头比90°弯头具有更小的颗粒-管道碰撞频率,管道冲蚀磨损降低;合成器携带的灰分入口气速大小影响灰分对管道内壁的冲击频率,进而影响冲蚀速率。此研究结果可用于检测煤气化炉合成气出口管道的受磨损情况,进而达到节约管道维修成本,延长管道的使用寿命。In the pulverized coal gasification process used in Shell Company,the pulverized coal enters the gasifier with high temperature and high pressure to react to generate syngas and viscous ash,which adhere to the inner wall of the pipeline.When the syngas carries ash through the elbow of the pipeline,the erosion at the elbow is caused due to the change of fluid flow direction.The erosion occurred in the elbow greatly affects the safety of outlet syngas pipeline transportation in coal gasification industry.To study the influencing factors of the corrosion occurred in the elbow,the method of fluid dynamics(CFD)was used to establish a gas-solid two-phase flow model,the transporting conditions of syngas and pulverized coal particles in the pipeline was simulated.The effects of different pipeline angles and particle flow on pipeline erosion were analyzed and discussed according to the simulation results.The simulation results showed that factors such as the angle of the pipeline and the inlet gas velocity will affect the erosion of the pipeline,the 135°elbow has a smaller particle-pipe collision frequency than the 90°elbow,and the erosion wear of the pipeline is reduced;inlet gas velocity of the ash carried by the synthesizer affects the impact frequency of the ash on the inner wall of the pipeline,which in turn affects the erosion rate.The results of this study can be used to detect the wear of the coal gasifier syngas outlet pipeline,thereby saving the cost of pipeline maintenance and prolonging the service life of the pipeline.

关 键 词：数值模拟 弯头角度 流体流量 管道冲蚀 

分 类 号：TQ050.2[化学工程] TH122[机械工程—机械设计及理论]