Prediction of micromixing effects in precipitation: Case of double‐jet precipitators
Prediction of micromixing effects in precipitation: Case of double‐jet precipitators
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DOI：
10.1002/aic.690400306
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发表时间：
1994-03
期刊：
影响因子：
3.7
通讯作者：
R. David;B. Marcant
中科院分区：
文献类型：
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作者：
R. David;B. Marcant
本文用一个模型对双射流半间歇式和连续式搅拌沉淀器的混合效果进行了评价，该模型给出了混合条件对初级成核通量的影响。预测的趋势进行了比较，与不同的作者，包括那些从一个新的研究草酸钙半批双喷射沉淀的结果。令人满意的定性协议被发现为不同的化学系统作为一个功能的进料速率，搅拌速度和进料位置草酸钙沉淀。两种类型的沉淀系统被证明，取决于添加/罐体积的比率，初始过饱和度和给定沉淀的固有刚度因子。这两种类型之间的差异取决于相对于用完全混合获得的参考初级成核通量，通过不完全混合的初级成核通量的增加或减少。
Mixing effects are evaluated for double jet semibatch and continuous stirred precipitators by a model which gives the variation of the primary nucleation flux from the mixing conditions. The predicted trends are compared with results of various authors, including those from a new study of calcium oxalate semibatch double-jet precipitation. Satisfactory qualitative agreement is found for the different chemical systems as a function of feed rate, stirring speed and feed locations for calcium oxalate precipitation. Two types of precipitation systems are demonstrated, depending on the ratio added/tank volume, the initial supersaturations and the intrinsic stiffness factor of a given precipitation. The difference between the two types depends on the increase or reduction of the primary nucleation flux by imperfect mixing with respect to the reference primary nucleation flux obtained with perfect mixing.