射流速度对多喷嘴干粉气化炉内反应流动的影响

摘要

A comprehensive mathematical model is developed for the simulating calculation of the multiphase reaction flow process in a multi-burner whirl impact pulverized coal gasifier made in Keda Clean Energy CO.,LTD.The influence of jet velocity on temperature and flow field in gasifier is also investigated.The results show that the mixture of gas and solid can be improved with the increase of jet velocity.Meanwhile,the reflux area is enlarged,and the temperature and content of available gas increase.However,the increase of jet velocity causes a high gas velocity impacting the dome,and a rise of outlet temperature.This sets high requirements for the downstream apparatus.Therefore,it is important to choose a reasonable jet velocity to meet the process demand.%建立了描述气化炉内流动和反应的综合数学模型,对安徽科达洁能股份有限公司(以下简称"科达洁能")研制的旋流撞击式干粉气化炉进行了模拟计算,分析了不同气化剂射流速度对气化炉内流场和温度分布的影响.结果表明,提高气化剂射流速度能有效改善气化炉内的气固混合情况,回流区域变大,炉内整体温度水平上升,出口有效气组分提高;同时,射流速度的提高也导致气流冲击气化炉拱顶的速度变大,出口煤气的温度上升,对下游处理设备的要求提高.因此,应根据工艺要求,合理选择喷嘴气化剂的射流速度.