共查询到18条相似文献,搜索用时 132 毫秒
1.
2.
综述了聚合物搅拌脱挥设备的开发进展,分析了设备开发过程存在的关键问题。指出卧式脱挥设备中的流动特性、混合特性、成膜特性以及表面更新特性等是强化传质的关键因素,具有自清洁搅拌特性的高效卧式脱挥设备是装备开发与研究的主要方向。阐述了计算流体力学(CFD)在研究高黏流体卧式搅拌设备内传递过程机理中的应用。基于网格重叠技术的有限元方法和基于动网格的有限体积方法可以解决复杂几何结构的桨叶和翅片、双轴的旋转运动以及啮合机构非常小的间隙等难题。借助于CFD中VOF多相流模型可以精确地追踪气液相界面,模拟反应器中的成膜过程和表面更新特性,进而可以深入分析设备中的传质过程,为高效聚合物脱挥设备的优化与设计提供了新的思路。 相似文献
3.
通过对催化剂沉降槽V3102A/B的搅拌轴、搅拌器及搅拌容器的强度和刚度的研究计算,探索了搅拌设备设计的规律,为搅拌设备的设计积累了有益的经验。 相似文献
4.
发酵罐是一种搅拌反应器 ,主要利用浆叶搅拌 ,使参加反应的物料混合均匀 ,使气体在液相中很好地分散、强化相间的传热、传质。搅拌设备在工业生产中应用范围很广 ,尤其在化工生产过程中 ,它是重要的操作单元之一。所以 ,简单地介绍一下 ,发酵罐的设计、计算内容。本设计、计算内容的依据是国家及部一级具有权威的单位编制的设计用书及标准规范 ,如《化工设备设计全书》的《搅拌设备设计》手册 ,《钢制压力容器》等 ,都是在实践中证明了的正确的并具有实用价值的理论书籍。 相似文献
5.
6.
7.
8.
针对搅拌设备设计中有关搅拌功率、搅拌槽的传热和固液悬浮搅拌的问题 ,通过自身的设计实践 ,对其中的相关内容和参数 ,提出自己的看法 相似文献
9.
列举了粉末喷涂过程设备逸粉的危害,提出粉末喷涂设备设计要“五位一体”统筹考虑的设计思想,并从设备选型、设备设计、设备管理、设备改造诸方面提出防止粉末外逸的解决方案。 相似文献
10.
<正> 搅拌反应罐是化工生产中使用最广的设备之一。合理地布置搅拌轴轴承的位置、减少搅拌轴的摆幅、保证搅拌轴悬臂的稳定性,这是搅拌设备设计中一个值得探讨的问题。关于立式搅拌轴轴承的最佳间距,至今尚无十分成熟的计算公式。文[3]分析了搅拌轴的变形,认为轴承间的最佳间距为: 相似文献
11.
脱盐是油田或炼油厂满足预定原油质量控制指标的关键处理环节,稀释水掺混属于原油电脱盐系统的关键步骤,直接影响系统脱盐效率和运行能耗。鉴于原油电脱盐稀释水掺混问题的本质可以归结为特定连续流状态下的油水混合,本文从评价方法、混合机理、掺混设备三个方面系统阐述了原油电脱盐稀释水掺混技术的研究进展。在简要介绍工程实际中原油电脱盐稀释水掺混所用多尺度油水混合评价方法的基础上,归纳总结了机械搅拌、管道节流、管内固定内构件切割、射流撞击、电分散五种代表性的油水混合机理,进而相应介绍了管道多级机械搅拌掺混、混合阀类掺混、基于管式静态混合器掺混、稀释水射流掺混、稀释水静电掺混五类设备的结构、工作原理及其各自性能优缺点。总体而言,迄今油水混合机理研究未能与原油电脱盐工艺稀释水掺混设备研发同步协调发展,应该秉持交叉复合的思想,尽快加强射流撞击类油水混合机理研究以及相应技术与设备的开发,同时进一步拓展高效混合单元过程的应用范围。 相似文献
12.
13.
Positron emission particle tracking, generally known as PEPT, is an imaging method for following the motion of a single tracer particle in a dense medium; this particle may be as small as 100 μm. The imaging method has been applied to many operations, among these being the mixing of dry powders and granular materials. There is one class of equipment in which mixing is imparted by the use of blades that has much in common with equipment used for agglomeration. From studies on dry mixing, it is possible to deduce some of the mechanisms governing behaviour and a physically based approach to design and operation is now becoming possible. Little is presently known from applying PEPT to agglomeration. However, PEPT will be of direct value in determining the occupancy of material in equipment as a function of position and time; it will provide similar information on the velocity field. It is capable of development for use on commercial scale agglomerators. While it does not allow direct observation of the collision processes that are critical for growth and breakage, PEPT does provide a quantitative basis from which logical inferences are possible. 相似文献
14.
This paper is the result of a plenary discussion session held at the 11th European Conference on Mixing. Three perspectives on mixing research are explored: that of the industrialist, the equipment manufacturer, and the academic researcher. There was strong agreement that, while the one dimensional problems are reasonably well understood and many engineers thus perceive that mixing is simple, current practice actually requires us to address complex, multi‐dimensional problems with interactions between mixing, reaction, multi‐phase physics, surface phenomena, and transport phenomena. Understanding these multi‐scale, multi‐mechanism problems requires models which include interactions between the phenomena, and allow the effects of these interactions to emerge. Developing these models will require us to shift our perspective on mixing from one of equipment design to one of the mixing field as a fundamental physical mechanism. 相似文献
15.
16.
17.
Walter Müller 《化学,工程师,技术》1981,53(11):831-844
Mixing of solids: present methods and current state of knowledge in design of equipment. In the design of mixing processes involving solids, power requirements and mixing time are of primary interest. Frictional forces, which are responsible for the resistance to mixing tools, depend on such parameters as fineness and roughness of the material. In addition, the state of compression of the material and geometric considerations exert their influence. Fundamental investigations which involve scale-up are extremely laborious and hence insufficiently available at present. For this reason, design depends mainly on the body of experience available to manufacturers. This paper reviews our present knowledge as illustrated by several well known mixing processes. 相似文献
18.
就搅拌设备怎样合理设置搅拌轴承的位置,从而减少弯曲应力及搅拌设备传动部位的振动和噪音,提出了在单元操作中经常用到的搅拌设备的结构设计问题。并详细论述了解决这些问题的方法,为工程设计、制造安装提供了一定的依据。 相似文献