溜槽转运过程中落料诱导气流的影响因素  

Influence factors for induced airflow of bulk materials in chute transfer station

作　　者：李小川[1] 王启立[1] 刘颀[2] 李强 罗会清[1] 胡亚非[1] 杨豪[1] 

机构地区：[1]中国矿业大学化工学院,徐州221008 [2]中国矿业大学电力学院,徐州221008 [3]南京中建化工设备制造有限公司,南京210000

出　　处：《粉末冶金材料科学与工程》2015年第5期683-689,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51404252);国家级大学生创新训练计划资助项目(201410290028)

摘　　要：溜槽转运过程中产生的诱导气流是散料输送过程扬尘的主要诱因,本文作者通过研究圆形溜槽的倾角γ和直径D、溜槽长度L、物料的质量流量mp及有效诱导气流量Q等参数对诱导气流速度ug的影响,分析影响溜槽转运诱导气流的主要因素。结果表明:溜槽倾角γ从能量转化和物料排布两方面影响诱导气流,诱导气流速度ug随γ增大而增大,但不同L的溜槽,ug随γ增大而增加的趋势不同,ug-γ曲线的幂指数随L增加而增加,溜槽转运通过降低输送过程中物料的分散度和减少物料与空气的接触面积来降低诱导气流速度,对直径为110 mm的溜槽,ug与L拟合曲线的幂指数约为0.64;溜槽直径D是决定诱导气流形成有效流动或发生"反混"现象的重要因素,选择合适的溜槽直径能强化诱导气流对粉尘的携带能力;溜槽转运增加了料流核心区物料的比例,使ug随mp增大而增加的速度放缓,ug与mp的0.15次幂成正比。Induced airflow caused by falling bulk materials in chute transportation process was the chief cause of dust fugitive. In order to explore the main influence factors for induced airflow in chute transfer station, the inclination angle y, diameter D and length L of the circular chute, the mass flow rate of material rap, the induced airflow velocity Ug and the effective induced air flow Q were studied. The conclusions are as follows： Induced flow is effected by the chute inclination angle ）, from two aspects of energy transformation and material arrangement, and with the y increasing, the induced airflow velocity Ug increases, hut for the chute of different lengths, the Ug increases as the y increases with different increasing trend. The exponent of Ug-y curve increases with the increase in L. In chute transfer process, the induced airflow velocity is dropped by reducing the dispersity of material of falling process and reducing the contact area of material with each other. For the 110 mm diameter chute, the power index of fitting curve with Ug and L is about 0.64. An important factor of the formation of the effective flow or occurring the ＂back mixing phenomenon＂ of the induced airflow is the chute diameter D. Choosing the fit chute diameter can strengthen the capacity of dust carrying of the induced airflow. Chute transfer process improves the proportion of core zone material of the flowing material, so that it makes the increase speed of Ug slow down with the increase of rap, and 0.15th power is proportional to ug and rap.

关 键 词：溜槽 转运点 诱导气流 

分 类 号：TB44[一般工业技术] X513[环境科学与工程—环境工程]