电子玻璃粉体颗粒特性与造粒工艺参数的关系

将喷雾干燥法造粒应用于电子玻璃产品的生产中,采用压力式喷雾干燥法对电子玻璃浆料进行喷雾干燥造粒,研究了喷雾干燥的压力、喷嘴孔径大小、浆料的液固比和粘结剂的含量与造粒后的粉体颗粒粒径分布的关系。研究表明,含固量越高,黏度越大,平均粒径明显增大;喷雾压力适中,喷嘴孔径为0.7 mm时,可得到流动性良好,松密度适中的干燥物体。     

专利技术

膜法气体分离节能工艺申请(专利)号:201010525526.3公开(公告)日:2012-05-16申请(专利权)人:上海瑞气气体设备有限公司摘要:本发明公开了一种膜法气体分离节能工艺,原料气通过无热再生吸附式干燥机进行干燥,该无热再生吸附式干燥机的第一干燥塔和第     

热固性塑料造粒新技术

介绍了热固性塑料造粒新技术———喷雾造粒的特点、工艺 ,对喷雾造粒产品与筛选造粒、挤出造粒产品的颗粒、性能并行了对比     

绝缘封接粉体造粒颗粒特性的研究

采用压力式喷雾干燥法对封接玻璃浆料进行喷雾干燥造粒,研究了喷雾干燥的压力、喷嘴孔径大小、浆料的固液比和粘结剂的含量与造粒后粉体颗粒粒径分布的关系.研究表明,浆料固体含量越高,粘度越大,平均粒径变大越明显;喷雾干燥压力增加,浆料流量变大,造粒后粉体颗粒的中位径和松密度下降;喷嘴孔径增加,造粒粉体的颗粒度显著增大,流动性增加,但松密度下降.     

离心喷雾干燥系统改造

针对公司原有干燥塔体积大、干燥能力差、易燃易爆等缺点,对热风分配器、管道及其附属设备进行改造;从而使干燥塔能够长期安全稳定地运行,提高生产能力,并减少粉尘爆炸。     

流化床喷雾造粒颗粒强度的影响因素研究

颗粒强度作为流化床喷雾造粒产品的重要评价指标,对其影响因素的实验研究具有重要的现实意义。本文在一间歇锥形流化床喷雾造粒器中,以食用小麦淀粉为原料,以明胶的水溶液为粘结剂,实验研究了流化气速、床层温度、喷嘴雾化空气压力、粘结剂浓度对喷雾造粒颗粒强度的影响。结果表明,在本实验范围内,流化气速对颗粒强度的影响显著,床层温度、粘结剂浓度对颗粒强度也有较大的影响,而且均是非单调的。但喷嘴雾化空气压力与颗粒强度之间存在正向相关性。     

液相烧结碳化硅喷雾造粒工艺控制

阐述了液相烧结SiC陶瓷喷雾造粒过程中的相关制备工艺,研究了浆料的特性、干燥温度、喷雾压力等因素对粉体性能的影响.并通过实验总结出一套合理的工艺参数,制备出球形实心颗粒粉料.粉料的松装密度0.88 g/cm3、休止角33.5°、平均粒径50μm,具有良好的流动性及快速填充性,可直接用于干压成型.     

单频激光干涉仪四通道信号接收系统

在单频激光干涉仪四通道信号接收系统原理基础上,提出一种采用Wollaston棱镜的四通道信号接收系统。当使用偏振分光镜的四通道信号接收系统时,由于偏振混合现象,在信号接收的过程中会增加额外的误差。而Wollaston棱镜的自然物理特性提供了更好的分光性能,从而能降低偏振混合所带来的影响,提高了信号输出质量,并能简化接收系统中的光学元件。     

热流道系统喷嘴泄漏测试装置设计

与传统的冷流道模具相比,热流道模具具有节约原料、提高生产效率等优点而被广泛采用。喷嘴是热流道模具中的主要部件,喷嘴通常由喷嘴体和螺纹连接在其上的喷嘴头组成,在喷嘴体和喷嘴头的螺纹连接处有可能存在泄漏。现在由于没有专门的对喷嘴泄漏进行测试的装置,所以只能在用户使用时发现喷嘴体和喷嘴头的连接处存在泄漏后再对喷嘴进行修复或更换,影响了正常生产,甚至有可能造成质量和生产事故。     

在运动的输送带上造粒

颗粒状原材料可以在沸腾冷却设备中生产和制造出来。造粒可以防止凝聚，有利于定量服用，而且一般来讲在下一步的输送过程中更不容易粘合在一起。与压片、碎片和喷雾造粒技术不同，这种沸腾冷却造粒技术具有流动性，很高的堆积密度和很少的粉尘量。     

CFD modelling of moisture evaporation in an industrial dispersed system

A methodology is presented here for the mathematical modelling of moisture evaporation in a dispersed system in an industrial tower. An empirical model using characteristic drying curves was applied to calculate moisture evaporation from a droplet and particle. A simple method was developed to calculate the agglomeration process of the dispersed phase in the drying towers, using transient functions between the initial and final particle size distributions, at the nozzle and in the final product. The developed model and simulation results were validated on the basis of industrial spray tower experiments. High instability of the airflow due to the geometry of the dryer and the construction of the air inlets was observed. The general methodology applied within this CFD model is universal, and can be applied to the scaling-up of installations for dewatering in dispersed systems in order to determine configurations of feeding systems and control the product quality and safety of the process.     

Numerical simulation on gas-droplet flow characteristics and spray evaporation process in CFB-FGD tower

Nozzle arrangement in the nozzle spray system has a significant impact on the gas-droplet flow characteristics and the temperature distribution within the circulating fluidized bed flue gas desulphurization (CFB-FGD) tower, which is critical to the SO₂ removal efficiency. The effects of spray direction, nozzle number and nozzle spray angle on gas-droplet distribution and temperature distribution inside the FGD tower are investigated with numerical simulation based on a Eulerian-Lagrangian mathematical model. An optimal nozzle arrangement scheme is proposed to improve the contact between gas and water droplets and the flue gas temperature distribution. Results show that upward spray direction is beneficial to the interaction between water droplets, improving gas-droplet flow characteristics and spray evaporation process, and water droplets number trapped by tower wall could be reduced in the water droplets evaporation. With the increase in nozzle number, it is conducive to the contact between flue gas and water droplets to increase the evaporation efficiency of water droplets, as well as the uniformity of temperature distribution inside the tower. With nozzle spray angle increases from 30° to 120°, flue gas velocity decreases, water droplets number trapped by the tower wall increases. The temperature distribution at different cross-section is the most uniform when the nozzle spray angle is 60°.     

基于布堆画艺术理念的铜川中医药文化信息可视化设计研究

目的 探索基于布堆画艺术理念的铜川中医药文化信息可视化设计,以促进布堆画艺术与中医药文化的结合及发扬光大。方法 采用文献综述、调查分析、实证研究等方法,将传统中医药文化与布堆画艺术表现手法相结合,并融入铜川地区的特色中医药文化可视化设计中。结果 将铜川中医药文化划分为药之源、药之宴、药之器、药之技四大主题,通过布堆画艺术与中医药文化相结合的方式,创作出具有铜川区域化内涵的信息可视化设计,展示出传统布堆画艺术与铜川中医药文化的魅力。结论 布堆画艺术与铜川中医药文化的融合为信息可视化设计提供了创新途径,并有望起到对铜川地区及国内中医药文化产业的宣传作用。     

新型热泵干燥系统的金丝皇菊干燥实验

目的 为研究热泵在中药材干燥中的性能,并针对批式干燥器干燥不均匀的问题,设计开发一套能够均匀干燥物料的热泵干燥系统.方法 以金丝皇菊为干燥材料,对热泵干燥设备进行实验研究,并对系统的送风温湿度均匀性、系统能效和物料品质进行分析.结果 该系统干燥过程的温湿度、物料含水率的均匀性和温度控制精度都很高,主机室的温度、湿度稳定,且显著高于外界环境,这不仅避免了热泵系统受外界环境因素的影响,且提供了稳定的运行环境.热泵干燥机组的能效约为5.88,系统能效约为1.32,除湿能耗约为0.66 kg/(kW·h).干燥后的金丝皇菊花瓣未出现明显的色差、卷曲和破损现象,干花的完整度高.结论 新型热泵干燥系统能够满足金丝皇菊的工艺要求,最终得到的金丝皇菊的干燥品质较高.该研究为热泵技术在中药材干燥领域的应用提供实际案例和技术参考.     

Use of experimental designs to optimize fluidized bed granulation of maltodextrin

The goal of this study was to use the experimental design approach in order to determine which process parameters are the most influent to granules properties. The agglomeration process was performed with a fluidized bed processor equipped with a top-spray tilted nozzle. The granules were obtained by binding fluidized particles of maltodextrin (DE 12) with an aqueous solution of maltodextrin. The variables considered in the experimental design were fluidization air flow rate, drying air temperature, spraying pressure and binder flow rate. The physical properties of the granules were evaluated in terms of granule size, particle size distribution, dissolution time and flowability. Moreover, the amount of binder for each experiment was noted. The statistical analysis performed with Statgraphics® Centurion version XVI software indicated that the best operating conditions were found for low fluidization air flow rate, high drying air temperature, high spraying pressure and high binder flow rate. The study also revealed the difficult task of acquiring all the optimum properties at the same time.     

基于焓差法的燃机电厂机械通风逆流湿式冷却塔变工况特性研究

结合机械通风逆流湿式冷却塔自身特点,基于焓差理论建立了冷却塔热力性能变工况计算模型,研究分析了大气压力、干球温度、湿球温度、冷却水量、凝汽器热负荷、冷却面积、通风阻力以及风机风量等参数对冷却塔进、出塔水温的影响规律。结果表明：大气压力和干球温度对出塔水温的影响可以忽略不计,湿球温度是影响出塔水温的主要环境因素;冷却水量、凝汽器热负荷、失效冷却面积、通风阻力均与出塔水温成正相关关系,而风机风量增大,出塔水温会降低。研究结果将有助于准确预测变工况下冷却塔出塔水温的变化趋势,为冷却塔变工况运行调整提供理论依据。     

SAXS investigation of silica aerogels derived from teos

Silica aerogels were obtained through a sol-gel process with tetraethoxysilane (TEOS) followed by supercritical drying with respect to CO₂. Samples of different densities, different catalyst conditions, and different preparation processes including the common one-step and the special two-step sol-gel processes were investigated via small-angle x-ray scattering. The power-law dependence of the scattered intensity, a characteristic of fractal structures, was observed for all the one-step aerogels. A crossover from the power-law characteristic of fractal structures to surface scattering was also observed. For the aerogels derived from the two-step sol-gel process, no power-law dependence of the scattered intensity was observed, signifying a lack of fractal structure. Oxidation of the samples smoothed the particle surfaces but did not influence the aerogel structures. The monolithic xerogel was found to consist of spherical particles with size of about 10 nm.     

陶瓷膜澄清生地黄提取液的膜污染和清洗研究

采用陶瓷膜澄清生地黄提取液,通过阻力分析法,比较了Al2O3和ZrO2膜的抗污染性能;采用红外光谱仪(IR)、等离子发射光谱(ICP)、电镜(SEM)和能谱(EDX)等检测仪器分析了污染物位置和成分,探讨了膜污染的机理;考察了不同清洗剂的清洗效果,确定了合适的清洗方法,为陶瓷膜在中药提取液澄清过程的应用提供指导．     

稀土异戊橡胶螺杆挤压脱水膨胀干燥一步法

采用螺杆挤压脱水膨胀干燥一步法干燥稀土异戊橡胶,考察了模头温度、机筒温度、模头压力和螺杆转速对产品质量和生产能力的影响,优化了稀土异戊橡胶干燥一步法工艺参数.在优化工艺条件下获得了较好的干燥效果,门尼黏度和挥发份满足产品的应用要求.     

硝基胍连续喷雾干燥数值模拟研究

在对喷雾干燥塔内流动特点认识的基础上,采用较为成熟的计算流体力学（CFD）模型及算法,建立适用于硝基胍物料喷雾干燥的应用模型。利用Gambit软件对几何模型进行网格划分,导入Fluent中进行数值计算,预测塔内流场分布情况、液滴含水率及颗粒平均粒径等。通过测试样机干燥产品的含水率、产品粒度分布及场内温度分布等发现,预测结果与实验结果大致吻合,说明模拟结果有一定的准确度和可靠性。