Optimization of the wash liquor flow rate to improve washing of pre-deliquored filter cakes
Optimization of the wash liquor flow rate to improve washing of pre-deliquored filter cakes
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DOI：
10.1016/j.ces.2007.04.022
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发表时间：
2007-08-01
影响因子：
4.7
通讯作者：
Carvin, Philippe
中科院分区：
文献类型：
--
作者：
Ruslim, Franky;Nirschl, Hermann;Carvin, Philippe
滤饼洗涤是固液分离过程中提高颗粒产物纯度质量的常用方法。在工业应用中，该工艺步骤通常被视为黑盒，其中通过试错进行优化。通过建立物理模型来描述滤饼等多孔结构内部的洗涤现象，学术界取得了决定性的进展。虽然一些模型已经导致更好地理解的过程中，实验工作仍然是不可避免的，以确定优化策略。这一贡献是一个经验的方法来调查洗涤预脱液滤饼的重要工艺参数的影响，重点是洗涤液和滤液流速。在洗涤预脱水的滤饼时，由于不均匀的流动，在洗涤液添加时的低水分含量可能对洗涤效率非常不利。这可能是在低洗涤液流速下洗涤时的不良再润湿过程的结果。观察到流速的增加非常有利于设定滤饼的较高水分含量，并因此加强洗涤液的均匀分布。为了良好的洗涤，通常需要洗涤液在滤饼内的均匀分布。(c)2007爱思唯尔有限公司保留所有权利。
Filter cake washing is a common way of improving the quality in purity of particulate products in solid-liquid separation processes. In industrial applications, this process step is usually treated as a black box where optimization is performed through trial and error. Decisive progress has been made in academia by the development of physical models to describe the washing phenomena inside a porous structure such as filter cakes. Although some models have led to a better understanding of the process, experimental efforts are still inevitable for determining optimization strategies. This contribution is an empirical approach to investigate the influence of important process parameters of washing pre-deliquored cakes with the focus on the wash liquor and filtrate flow rate. In washing a pre-deliquored cake, low moisture content at the time of wash liquor addition can be very disadvantageous for the wash efficiency due to inhomogeneous flow. This can be the result of a poor re-wetting process while washing at low wash liquor flow rates. An increase of the flow rate was observed to be very advantageous to set higher moisture content of the filter cake and therefore enforce a homogeneous distribution of the wash liquor. A homogeneous distribution of the wash liquor inside the cake is generally required for good washing.(c) 2007 Elsevier Ltd. All rights reserved.