固定床熔渣气化高速射流区气固运动行为研究

Research on the gas-solid two-phase movement behavior in turbulent flow region of fixed bed slagging gasifier

为研究固定床熔渣气化炉中气化剂喷嘴安装角度、喷嘴口径、气化剂射流速度与高速射流区深度的关系,利用模化原理对工业级气化炉高速射流区建立50 cm二维冷态模型,采用精密皮托管测量颗粒床层中的气体速度分布,并采用无量纲分析方法,对试验数据进行处理。结果表明:射流穿透深度与喷嘴口径的二次方大致成正比关系;射流深度随喷嘴安装角度的增大呈现先增加后减小的趋势,使得射流深度最大的安装角度为17°~20°;射流深度随射流气速增加呈增大趋势,并拟合出气化剂喷嘴安装角度、射流速度、喷嘴口径与射流区深度的无量纲关系式。

In this paper,the relationship between the slag gasifier nozzle angle,nozzle diameter,jet velocity and turbulent flow region depth in the fixed bed gasifier were investigated.The study was carried out on a two-dimensional cold-state experimental model of industrial-scale gasifier established according to similarity theory.The gas velocity distribution in the granular bed was measured by the precision pitot tube,and the data was processed by dimensionless method.Results show that jet penetration depth and the quadratic of nozzle diameter are strongly related.Nozzle jet depth presents a trend of increase before decrease with the increase of nozzle angle.Jet depth is the largest when installing angle varys from 17° to 20°.The jet depth increases with the increasing of jet gas velocity.The dimensionless relation of gasification agent nozzle angle,jet velocity,nozzle diameter and turbulent zone depth are elucidated.