U型夹套容器封口锥的强度计算与比较

针对U型夹套封口锥的结构特点,采用我国现行标准《机械搅拌设备》(HG20569-94)及《钢制压力容器》(GB150-98)对其强度进行了计算和分析比较,结果表明,封口锥的壁厚往往大于夹套壁厚,用夹套壁厚代替封口锥壁厚是不安全的,同时也发现,《机械搅拌设备》的计算结果偏大。     

化工反应器夹套与搅拌技术的节能

夹套的换热和搅拌混合技术是化工搅拌反应器节能的关键.本文介绍搅拌反应器新型夹套结构和高效搅拌器的最新研究成果,并给出应用实例.     

板式干燥器

<正> 板式干燥器(Plate Dryer)又名多层园盘干燥器,系一种多层园盘,转耙搅拌,竖型连续干燥装置,属传导干燥为主的接触干燥器类。该设备是在固定床传导干燥器以及耙式等搅拌型干燥器的基础上不断改进发展而成的。这种干燥过程就是将载热体通入固定的多层空心园盘内,藉助传导间接加热金属盘面上所接触的湿物料,并在类     

一氧化碳吸附干燥器的技术改进

针对原吸附干燥器存在内部盘管焊接接头容易泄漏、设备使用寿命短、材质浪费较大等问题,对其进行了改进。将其中的气体分布改为筛孔板结构,在盘管和总管之间增加异径接头,在夹套与内筒之间增加加强圈,改进后的吸附干燥器结构合理,投资省,效率高,运行平稳。     

《石油化工设备设计选用手册》——《干燥器》分册出版发行

本书内容以工程应用、设计选用为主,阐述了干燥过程的基础原理,介绍了箱式干燥器、带式干燥器、气流干燥器、流化床干燥器、喷雾干燥器、回转圆筒干燥器、转鼓干燥器、搅拌式干燥器、冷冻干燥器、微波干燥     

吸附干燥器的改进与优化设计

针对原吸附干燥器存在结构较为复杂、材质浪费过大、内部盘管焊接接头容易泄漏、设备使用寿命短、使用效果较差等问题,通过将其中的气体分布改为筛孔板结构、夹套与内筒之间巧妙增加加强圈等方面的改进设计,新的吸附干燥器结构简单,投资省,运行平稳、安全、可靠、高效,完全达到并满足生产和工艺要求。     

新型全流通夹套结构聚合釜开发与应用

根据原有70 m3PVC聚合釜的冷模与热模传热性能和搅拌性能测试和分析,提出了新型全流通半圆管夹套结构。夹套的传热面积增加14 m2。通过现场传热测试,在保证聚合釜容积不变的条件下,单釜的生产能力可提高30%以上。新开发的100 m3全流通内夹套PVC聚合釜是适应于PVC悬浮法生产工艺的设备,通过对其结构特点、有限元应力分析、传热分析、搅拌模拟试验、流场分析等研究,开发了拥有自主知识产权的大型聚合釜。     

酸洗应用及咨询(四)

10.来信综合反映(1985。10) 搪瓷夹套设备,对夹套内水垢进行盐酸酸洗后,有时瓷面龟裂、掉瓷,造成损失,原因何在? 编者注:搪瓷夹套设备如图1为带搅拌的夹套反应器。对夹套内水垢进行盐酸酸洗,发生瓷面龟裂、爆瓷破坏,主要系酸洗缓蚀剂缓蚀效率低和抑制渗氢能力不良所致。     

新型70 m3全流通夹套PVC聚合釜的开发与应用

基于原有70 m3PVC聚合釜的传热性能和搅拌性能的测试和分析,提出了新型全流通半圆管夹套结构,夹套的传热面积增加14 m2,通过现场传热测试,在聚合釜容积不变的条件下,单釜的生产能力可提高30%以上。     

搅拌流化床干燥器传热特性的研究

以不同粒径的玻璃珠和分子筛为原料 ,对搅拌流化床干燥器进行了气固间传热特性的实验研究。比较了恒速干燥阶段带搅拌和不带搅拌时物料湿含量随时间的变化规律 ,研究了干燥器进口温度、进口气速、搅拌转速等因素对传热过程的影响 ,并得出了相应的传热膜系数关联式 ,计算值与实验值的误差小于 1 5     

Modeling of Sewage Sludge Flow in a Continuous Paddle Dryer

A model based on the theory of Markov chains has been developed to represent the residence time distribution (RTD) of municipal sewage sludge in a continuous paddle dryer. The flow of dry solids is described by a chain of n perfectly mixed cells, n corresponding to the number of paddles attached to the shaft. The transition probabilities between the cells are governed by two parameters: the parameter of internal recirculation, R, and the solids hold-up, Hu. In the absence of available correlation, both parameters are identified by fitting the model to experimental RTD data. The model demonstrates its ability to describe the sludge flow in a continuous lab-scale paddle dryer. A sensitivity analysis highlights that R is critical for the treatment uniformity while Hu controls the mean residence time and thus the final moisture content.     

蜂窝式板束结构的设计及比较

简要介绍了一台板壳式换热器蜂窝式板束的结构特点、参数及制作,由此引出一种新型的蜂窝夹套,并将此种蜂窝夹套与传统的蜂窝夹套作以比较。     

基于Fluent的流场数值模拟在制脂釜设计中的应用

基于Fluent平台,采用多重参考坐标法(MRF),以2#通用锂基润滑脂为工作介质,对桨框组合式双向搅拌脂釜内流场进行数值模拟。考察应用内外双向搅拌方式以及变形折叶桨时,制脂釜内宏观流场的分布特点,分析了折叶角θ、桨间距l和搅拌转速ω等参数的变化对流场的影响。结果表明,双向搅拌和变形折叶桨明显改善了物料流动状况;折叶角θ取45°时产生的流场分布较22°、60°更优;当桨间距l在(0.16~0.24)D范围内取值对流动特性和搅拌功率影响不大;内桨搅拌ωi转速高于200r/min后,提高转速无益于流场改善。     

NOY纺丝干燥系统改造

针对ＮＯＹ 型的干燥装置干燥效果不佳的缺点，通过对现有设备的改造，使干燥后切片含水率大幅度下降，生产运行情况得以改善，为同类型装置的改造提供了一种思路。     

干燥、粉碎一体化装置

本文对干燥、粉碎一体化装置的典型设备惰性粒子流化床干燥器进行剖析,介绍应用情况,并作了经济性评价。     

A SCACE-UP STUDY OF NOZZLE TOWER SPRAY DRYERS

A quasi-one dimensional model taking into account hindered drying beyond the critical tmisture content and droplet size distribution is used to scale-up nozzle tower type of a spray dryer with uniformly distributed air entry, based on pilot plant data. A pilot plant with 8 m high and 1.7 m diameter spray dryer is used to collect the drying data. Equilibrium and critical mistwe contents of the particles are also experimentally msured. The index of drying rate in the hindered drying period is calculated frun the pilot plant data. This index is used in the M e 1 to determine the drying capacity and thereby the mixinnnn particle size that can be produced ina 3.5 m dimoeter 12 m high nozzle t- type of spray dryer. Experiments are carried out in this spray dryer to verify the calculated values of the spray drying capacity. It is s h m that the model when used along with the pilot plant data is adequate for scale-up calaculations for nozzle taer type of spray dryers.     

A SCACE-UP STUDY OF NOZZLE TOWER SPRAY DRYERS

A quasi-one dimensional model taking into account hindered drying beyond the critical tmisture content and droplet size distribution is used to scale-up nozzle tower type of a spray dryer with uniformly distributed air entry, based on pilot plant data. A pilot plant with 8 m high and 1.7 m diameter spray dryer is used to collect the drying data. Equilibrium and critical mistwe contents of the particles are also experimentally msured. The index of drying rate in the hindered drying period is calculated frun the pilot plant data. This index is used in the M e 1 to determine the drying capacity and thereby the mixinnnn particle size that can be produced ina 3.5 m dimoeter 12 m high nozzle t- type of spray dryer. Experiments are carried out in this spray dryer to verify the calculated values of the spray drying capacity. It is s h m that the model when used along with the pilot plant data is adequate for scale-up calaculations for nozzle taer type of spray dryers.     

卧式反应釜螺旋导流夹套传热性能研究

利用FLUENT软件对螺旋导流夹套卧式反应釜的传热性能进行模拟计算,得出夹套冷却介质和内壁的温度变化以及流场分布状况,并对螺旋导流夹套与普通光壁内筒夹套的传热性能进行了比较。     

Influence of stirrer type on mixture homogeneity in continuous powder mixing: A model case and a pharmaceutical case

Continuous powder mixers offer a viable alternative to batch processes, but have received very little attention in scientific literature and in the industrial world. Mixer design is still very empirical and is not based on assessed methodologies. In this paper, we report experiments that aimed to compare two very different types of stirrers for a pilot-scale continuous powder mixer, and for two types of mixtures: a model mixture and a real pharmaceutical mixture. The first stirrer A is of the frame type with inclined paddles and internal transporting screw, the other stirrer B is of the shaft type with paddles mounted on it. Results are first presented from the viewpoint of bulk powder flow by hold-up determination and correlation with operating conditions. General relationships are derived which show that the mobile B leads to higher hold-ups, which may be an important drawback. The study of mixture homogeneity globally confirms these findings, especially in a dense phase flow regime. In the fluidised regime, where the stirrer B can be used, attention is drawn to the negative effect of excessive rotational speeds on the quality of the mixtures.     

螺杆挤压膨胀干燥机的改造与应用

简述了膨胀干燥机的基本结构，介绍了主体结构的改造及其应用效果。根据使用中存在的问题，开发了一种新的膨胀干燥机专利技术。