A model for the evaporation of water from large glass particles in pneumatic transport

A model is presented for the evaporation of water from large particles in pneumatic transport. The work is relevant for estimating the coating solution feed rate and the length of the draft tube in Wurster‐type particle coaters. Specifically, the rate of evaporation of water from 1 mm glass particles in a 28.45 mm tube was calculated from the model. The rate increased with solids mass flow rate, inlet air temperature and inlet particle temperature. The heat was more rapidly removed from the particle phase than from the air phase and high inlet air temperatures are tolerated. The model presupposes that the gas and particle velocities, and voidage are known and that the water film on a particle is thin and uniformly distributed. Hydrodynamic considerations that impact on the calculations are discussed.     

Colloidal Cu nanoparticles/chitosan composite film obtained by microwave heating for food package applications

In this paper, we describe the preparation and characterization of colloidal Cu nanoparticles/chitosan composite film (composite film) by solution-casting technique with microwave heating. Effects of the incorporation of colloidal Cu nanoparticles on structure, thermal behavior, surface, barrier properties and light transmission of composite film were investigated. The antimicrobial activity of films against Staphylococcus aureus and Salmonella enterica serovar Typhimurium, were also tested. Incorporation of colloidal Cu nanoparticles on chitosan matrix improved the barrier properties of films, decreasing the oxygen permeability as well as water vapor permeability and increasing the protection against UV light. The composite film was effective in alteration of cell wall and reduction of microbial concentration in the liquid culture for both bacteria tested.     

金属离子超分子吸附剂对水溶液中Cu^2＋吸附行为的研究

以环糊精修饰的SiO2为载体的吸附剂可以有效地吸附水溶液的Cu^2＋。静态吸附研究表明,该吸附剂对水中Cu^2＋的吸附经过90min可达平衡;吸附过程符合Langmuir吸附模型,25℃时,中性条件下Cu^2＋在环糊精超分子吸附剂上的最大吸附量为0.90mg·g^-1。     

双层单管并流式氨合成塔内件使用认识

分析了影响双层单管并流式内件氨产量的因素以及相应的改进措施,其稳定高产的性能表明它仍然是１０００ｍｍ氨民堵较为理想的内件之一。     

焦油管式炉在生产中的使用与维护

焦油管式炉是焦油蒸馏核心设备,贵阳煤气气源厂改造设备完善操作规程、加强管理、使管式炉达到安全,稳定、长周期运行,同时降低成本,提高经济效益。     

有机添加剂对铝管表面硅烷涂层耐蚀性的影响

讨论了乌洛托品、植酸和吐温-80等3种有机添加剂在缓蚀液中对铝管表面硅烷涂层耐蚀性的影响.通过失重、析氢、盐雾试验和电化学阻抗(EIS)检测了铝管的耐蚀性.结果发现,有机添加剂的加入,使铝管的耐腐蚀性能大幅度提高,尤以乌洛托品为佳.在以乌洛托品为添加剂的缓蚀液里,铝管表面复合膜层均匀致密,中性盐雾试验达到420 h.初步探讨了缓蚀膜的成膜机理.     

基于Pro／E的塑料模具设计——三通管模具设计

模具工业的发展与现代工业的发展密切相关,模具是用来成型各种工业产品的重要工艺装备,是机械制造工业成型毛坯或零件的重要手段。在本次三通管模具设计中,充分体现Pro／E在注塑模具设计中的高效与便捷,通过对塑件结构、材料、用途及参数等进行分析,确定模具采用一模两腔的布局;采用易去除浇口的潜伏式点浇口,保证塑件质量;采用推管推出的方式,保证推出力平稳,使塑件不易发生变形。设计流程还包括分型面、浇注系统、冷却系统、侧抽芯机构和推出机构的详细介绍。利用Moldflow Plastics Insight6．1对塑件进行CAE分析,根据参数选取相应的注塑机,并验证模具结构设计的合理性。     

焊接接头系数ф的思考

介绍了换热器格栅管撑的结构,提出了管撑的制造工装和加工工艺。     

内热式沸腾干燥器换热管组研制

内热式沸腾干燥器是聚氯乙烯生产中关键核心设备,换热管组是该设备上主要部件。本文介绍了换热管组的结构和制造难度。较详细地说明了为解决难点所用工装的结构和使用方法及采取的工艺措施。     

简易四轮式大型螺旋盘管机的结构介绍

本文对大型螺旋盘管机的原理及构造作一分析介绍,阐明其适用性和使用要求。