摘要
基于壳牌(Shell)粉煤气化工艺的工程实践,系统分析了高压粉煤密相气力输送的流动特性与控制机理。通过非栓塞式(固气比30~70 kg/m^(3))与栓塞式(固气比25~250 kg/m^(3))密相流动模型的对比研究,揭示了气速、压力梯度及煤质参数对流动稳定性的耦合影响规律。针对煤种切换(如褐煤D 50波动达30%)、管道异物堵塞(局部固气比达800 kg/m^(3))及设备失效(如通气锥堵塞率>30%)等典型工程问题,提出煤循环动态标定(HGI修正系数±10%)、异物分级拦截(过滤精度200μm)及流化系统冗余设计(氮气支管切换阈值±10%)的综合优化策略。工程应用结果表明,优化后系统固气比稳定在300~500 kg/m^(3),压降梯度波动降低40%,为粉煤加压气化工艺的高效运行提供了理论与技术支撑。
This paper systematically analyzes the flow characteristics and control mechanism of high-pressure dense-phase pneumatic conveying of pulverized coal based on engineering practices of Shell pulverized coal gasification technology.Through a comparative study of non-slug(solid-gas ratio 30~70 kg/m^(3))and slug(solid-gas ratio 25~250 kg/m^(3))dense-phase flow models,the coupled influence laws of gas velocity,pressure gradient,and coal quality parameters on flow stability are revealed.Aiming at key challenges such as coal type switching(with D 50 fluctuating up to 30%),pipeline foreign object blockage(local solid-gas ratio reaching 800 kg/m^(3)),and equipment failure(e.g.,aeration cone blockage rate>30%),comprehensive optimization strategies are proposed,including dynamic calibration of coal circulation(HGI correction factor±10%),hierarchical foreign object interception(filtration accuracy 200μm),and redundant design of the fluidization system(nitrogen branch pipe switching threshold±10%).Engineering applications demonstrate that after optimization,the solid-gas ratio of the system stabilizes at 300~500 kg/m^(3),with a 40%reduction in pressure drop gradient fluctuations.This study provides theoretical and technical support for the efficient operation of pulverized coal gasification processes.
作者
黄伟
魏正红
常娟
HUANG Wei;WEI Zhenghong;CHANG Juan(SHCCIG Yulin Chemical Co.,Ltd.,Yulin 719000,China)
出处
《山东化工》
2025年第24期90-92,101,共4页
Shandong Chemical Industry
关键词
粉煤密相输送
壳牌煤气化
固气比
流动稳定性
优化控制
pulverized coal dense phase conveying
shell coal gasification
solid-gas ratio
flow stability
optimization control
