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反应器搅拌器功率影响因素有什么?反应釜中搅



反应器搅拌器功率影响因素有什么?反应釜中搅



反应器搅拌器功率影响因素有什么?反应釜中搅拌器解决方法
影响反应器搅拌器功率的因素 反应釜中搅拌器的功率与罐内的流动状态有关,因此影响流动状态的因素也必然影响搅拌器的功率。反应器搅拌器的几何参数和操作参数:浆液直径、浆液宽度、叶片角度、转速、叶片数量、叶片距槽底的安装高度等。反应釜搅拌槽的几何参数:槽内径、液体深度、挡板宽度、挡板数量、导流筒尺寸等。搅拌介质的物理参数:液相密度、液相粘度、重力加速度等。
因为搅拌器的功率消耗是从搅拌器自身几何参数的运行条件来研究的,所以在影响因素中看不到不同搅拌目的的影响。换句话说,只要上述参数相同,不管搅拌过程如何,获得的搅拌器功率是相同的。这些影响因素可以归纳为泥浆、罐的几何变量、泥浆的操作变量和影响功率的物理变量。试图找出这些变量与功率之间的关系,从而解决搅拌器功率的计算问题。 (一)搅拌器功率计算中的准数值关系
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 影响搅拌器功率的变量太多,这使得研究非常困难。这些变量对权力的影响是不一样的,这是应该找到的主要影响因素,同时一些变量的范围应该划定,以便进一步研究。 为了找出影响因素与功率之间的关系,目前采用相似理论和维度分析,将大量相关的几何变量、操作变量和物理变量转化为少量有意义的无量纲数组,作为设计依据。相似理论的一种方法是首先建立描述混合流动状态的数学关系,然后将这种关系改写成无量纲形式。 我们知道搅拌介质的流动应该遵守质量和动量守恒定律。对于具有一定密度的牛顿流体,通过奈维一斯托克方程表达局部压力与局部速度的关系,可以得到奈维一斯托克方程的无量纲形式。为此,我们可以把浆体直径作为特征长度量,搅拌器速度的倒数作为特征时间量,液体密度与浆体直径的乘积作为特征质量,叶片直径与搅拌速度的乘积作为特征量,然后导出无量纲速度和无量纲压力,代入奈维一斯托克得到其无量纲形式。从这个无量纲方程可以看出,无量纲压力被代入奈维一斯托克方程,得到它的无量纲形式。从这个无量纲方程中,可以看出无量纲速度和无量纲压力是两个无量纲数组的和,即雷诺准数。其中欧表示流体惯性力与粘滞力之比,以及流体惯性力与重力之比。 功率是搅拌器转速和附加距离的乘积,扭矩可以从叶片表面的局部压力分布中得到,从而得到无量纲关系。全挡板条件 从上面可知,挡板是搅拌罐的附件,其改变罐中的流动状态。大部分的研究都是关于侧壁垂直挡板的。实验表明,挡板的宽度、数量和安装方式都会影响流量和功率。 混合器的功率最高,这种挡板状态称为全挡板状态。也可以说,当挡板满足全挡板条件时,即使添加附件,搅拌器的功率也不会增加。通常认为,当采用四个挡板时,挡板的宽度可以接近完全挡板状态。 布置在凹槽中的其他部件,例如盘管,可以阻碍水平旋转流动,也可以用作挡板。在无挡板的设备中,当满足其他静态元件时,也可以认为具有全挡板功能。它被称为挡板条件系数。其中是垂直于液体循环方向的所有内部组件的投影面积之和。当一些搅拌器偏心安装或倾斜插入槽中时,