摘要
通过搭建3.6 t/h竖式烧结矿冷却实验台,对烧结矿在下落过程中与空气的换热规律进行了研究,重点分析了不同气固比、冷却气体进口速度对气固换热过程的影响,并根据实验数据拟合出气固换热关联式。研究结果表明：随着气固比增加,冷却气体所携带的热量呈现出先增加后减小的趋势,当气固比在900~1 000 Nm3/t范围时,冷却气体携带的热量最大;随着冷却气体流速增加,气固换热系数不断增加,但其增长速率逐渐变慢;实验所得气固换热关联式为：Nu=1ε（17.67＋1.26Re0.5）,适用范围为：9 700≤Re≤25 000,0.80≤ε≤0.95,误差在±10%以内,具有一定的应用价值。
Through setting up the 3. 6 t / h vertical sinter cooling test unit,the heat transfer between air and the falling sinter of high temperature was studied. The influences of different gas-solid ratio and inlet velocity of cooling gas on gas-solid heat transfer were analyzed emphatically,and the empirical correlations of gas-solid heat transfer were obtained based on the experimental data. The results show that,with the increase of gas-solid ratio,the heat exergy of cooling gas presents a trend of earlier increase and later decrease,and it is maximum when the gas-solid ratio is 900 ~ 1 000 Nm3/ t. With the increase of cooling gas flow velocity,the gas-solid heat transfer coefficient increases continuously,but the increase rate has presented slowing tendency.The empirical correlation,Nu =1ε（ 17. 67 ＋ 1. 26Re0. 5）,9 700≤Re≤25 000,0. 80≤ε≤0. 95,with error within ± 10%,has a certain application value.
出处
《烧结球团》
北大核心
2015年第1期10-13,共4页
Sintering and Pelletizing
关键词
烧结矿冷却
竖式冷却
气固换热
气固比
sinter cooling
vertical cooling
gas-solid heat transfer
gas-solid ratio
