连续搅拌结晶制备大颗粒硫酸钠试验研究及模拟分析

发布时间：2018-03-19 05:26

  本文选题：连续搅拌结晶槽　切入点：硫酸钠　出处：《湘潭大学》2015年硕士论文　论文类型：学位论文

【摘要】：搅拌结晶器是一种在工业中应用非常广泛的结晶器,并且在化学化工等领域占有主导地位,长期以来,对于搅拌结晶器的研究一直处于半理论半经验式,通过微小型试验再扩大到实际生产中。本文针对搅拌式结晶槽生产的硫酸钠粒度偏小的质量问题,研究搅拌桨叶形式与搅拌强度对结晶器内流场的影响,优化结晶器结构来得出流场影响结晶质量的规律,旨在应用于中大型工业结晶技术中能够获得占比率更大的合格结晶产品。所做的研究有如下:首先,在结晶试验过程中,为了硫酸钠搅拌结晶顺利连续进行,就必须确保在形成过饱和度的卧式冷却器中不堵管,即需对清洗螺旋进行动力学试验研究,验证清洗螺旋除垢的可行性,得到可除晶垢的螺旋参数。其次,搅拌结晶试验中,主要对比两种桨型对晶体粒度的影响,其次试验研究了结晶温度,搅拌桨转速与晶体粒度的关系。试验中选取了锚式搅拌桨和三叶旋浆式搅拌桨进行搅拌结晶试验。首先,选取三叶旋浆式搅拌桨对硫酸钠溶液进行结晶试验,结晶温度在6种结晶温度下冷却结晶,试验数据可得,温差在10℃时硫酸钠晶体粒度最大。控制进料温度40℃,在6种转速下,选锚式搅拌桨所对应的硫酸钠结晶质量效果更佳,粒径更大。最后,利用FLUENT数值分析软件对结晶内的流场进行模拟,结合中试结果对结晶流场与硫酸钠结晶粒度的关系进行分析。
[Abstract]:Agitator is a kind of crystallizer which is widely used in industry, and plays a leading role in chemical and chemical fields. For a long time, the research of stirring mould has been in the semi-theoretical and semi-empirical form. In this paper, the effect of impeller blade form and stirring strength on the flow field in the mold is studied in view of the small particle size of sodium sulfate produced by agitated crystal cell. Optimizing the structure of the crystallizer to obtain the law that the flow field affects the crystallization quality, the purpose of which is to obtain a larger proportion of qualified crystallization products in medium and large scale industrial crystallization technology. The results are as follows: first, in the process of crystallization test, In order to ensure the smooth and continuous crystallization of sodium sulfate stirring, it is necessary to ensure that the tube is not blocked in the horizontal cooler which forms supersaturation, that is, the cleaning screw should be tested and studied dynamically to verify the feasibility of cleaning the screw scale. The helical parameters of the scale can be removed. Secondly, in the agitation crystallization test, the effect of two propeller types on the crystal particle size is compared, and the crystallization temperature is studied. The relationship between the rotating speed of the impeller and the particle size of the crystal. In the experiment, the agitation crystallization test was carried out with the anchor agitator and the three-impeller agitator. Firstly, the crystallization test of sodium sulfate solution was carried out with the three-blade rotary paddle. When the temperature difference is 10 鈩，

本文编号：1633021