摘要
细渣气流床气化炉可以大规模工业化利用气化细渣。为了提高气化炉的气化性能,借助冷态试验台和PDA测量系统,研究了10 000 Nm^(3)/h细渣气流床气化炉内气固两相流动特性,详尽对比了不同烧嘴偏置角度时的炉内流场。结果表明,同向旋转布置时,烧嘴所在水平截面速度场存在明显的中心切圆,创造了强烈的旋转流场。烧嘴偏置角度为2°时切圆面积最小,向上运动的颗粒最多,颗粒上升率最高到达0.47,湍流强度整体上要高于4°和6°时。在上炉膛竖直截面,偏置角度为2°时,向下运动的颗粒速度最大,向下运动的颗粒浓度最大,气流旋流强度最小,旋流最弱,不利于壁面形成熔渣。在下炉膛竖直截面,偏置角度为6°时的气流切向速度最大,旋流强度最高,轴向速度要大于4°和2°的轴向速度,缩短了颗粒在气化炉内的停留时间,不利与细渣的气化反应完全进行。
The entrained-flow gasifier for fine slag can be applied for large-scale industrial use of gasification fine slag.The gas-solid twophase flow characteristics of a 10000 Nm^(3)/h fine slag entrained-flow gasifier were studied using a cold flow experiment system and a PDA(Phase Doppler Anemometry)measurement system to improve the gasifier's gasification performance.The flow field in the gasifier was compared in detail with various burner bias angles.The results reveal that when the burner is arranged biased in the same direction,there is an obvious central tangent circle in the velocity field of the horizontal section where the burner is positioned.When the burner's bias angle is 2°,the tangential area is the smallest,the upward movement of particles is the greatest,the particle updraft rate is up to 0.47,and the turbulence intensity is more than when the bias angle is 4°or 6°.When the bias angle is 2°in the vertical section of the upper gasifier,the downward-moving particle velocity is the largest,the downward-moving particle concentration is the greatest,the airflow swirl intensity is the smallest,and the swirl is the weakest,which is not conducive to the formation of slag layer on the membrane wall.When the bias angle is 6°in the vertical section of the lower gasifier,the tangential velocity of the airflow is the greatest,the swirl intensity is the highest,and the axial velocity is greater than the axial velocity of 4°and 2°.The particles'residence time in the gasifier gets shorter,which hinders the complete reaction of the fine slag.
作者
路跃
李争起
黄椿朝
陈智超
LU Yue;LI Zhengqi;HUANG Chunchao;CHEN Zhichao(School of Mechanical and Electrical Engineering,Changchun University of Science and Technology,Changchun 130022,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Harbin boiler company limited,Harbin 150001,China;School of Energy Engineering,Xinjiang Institute of Engineering,Urumqi 830000,China)
出处
《洁净煤技术》
2025年第S1期170-179,共10页
Clean Coal Technology
基金
黑龙江省头雁行动计划资助项目
关键词
烧嘴偏置角度
细渣
气流床
气固两相流
PDA
burner bias angle
fine ash
entrained-flow gasifier
air/particle flow
PDA
作者简介
路跃(1990—),男,吉林吉林人,博士。E-mail:luyue90@163.com;通讯作者:李争起(1967—),男,黑龙江哈尔滨人,教授,博士。E-mail:green@hit.edu.cn。
