浅谈浮法玻璃搅拌装置

浮法玻璃的均匀性是衡量浮法玻璃优质与否的重要指标,机械搅拌可以消除或降低自然均化不能克服的缺陷,保证玻璃液的热均匀性和化学均匀性。本文介绍了三种典型的玻璃搅拌装置的功能和优缺点,并揭示了三者间内在的联系。     

浮法玻璃熔窑垂直搅拌过程物理模拟研究

以相似理论为根据,在一个与熔窑原型相似的小尺寸物理模型中,利用与玻璃高温熔体性质相似的模拟液,采用物理模拟实验的方法,对垂直搅拌器在玻璃熔窑中的作用机理进行了研究,探索了玻璃液中的非均质体在搅拌作用下的扩散规律,得出了搅拌器在熔窑中的合理布置方式及转动方向。     

浮法玻璃生产中垂直搅拌的机理探索

采用物理模拟的方法,定性研究了浮法玻璃熔窑中垂直搅拌器转速、搅拌温度和玻璃液流速等参数对玻璃液均化效果的影响;指出搅拌具有改变玻璃液中条纹消失时间和玻璃液在均化区的停留时间两个作用;搅拌器转速、搅拌温度和玻璃液流速等参数实际上是通过影响以上两个因素进而影响玻璃均化效果的。     

搪玻璃搅拌釜新型档板设计及应用

介绍搪玻璃搅拌釜新型挡板的宽度、数量、型式、安装、密封等的设置原则，并举例说明。     

新型搪玻璃搅拌桨搅拌特性数值模拟及实验研究

采用CFD方法模拟了具有相同桨径、不同桨叶折角和叶宽结构的6种新型搪玻璃搅拌桨的搅拌特性。考察了挡板、桨叶离底高度对釜内流场的影响,基于此分析了桨叶折角、叶宽对速度分布的影响。对模拟得到的搅拌功率和混合时间进行了实验验证,并与传统搪玻璃桨式搅拌器进行比较。结果表明：①新型桨叶在加挡板且桨叶离底高度为450 mm时,搅拌效果最佳;②随桨叶折角、叶宽的增大,桨叶区轴向、径向和切向速度均呈增大趋势,当桨叶折角为45°、叶宽为95 mm时,釜内混合效果最好;③随转速增大,搅拌功率呈增大趋势,混合时间呈减小趋势,新型桨明显比传统桨混合性能好,桨叶折角为30°、叶宽95 mm时功率消耗最低,桨叶折角为35°、叶宽95 mm时混合时间最短。     

铂金通道搅拌结构的设计

铂金通道是玻璃液在熔窑内熔化后进行澄清和均化的场所。在铂金通道搅拌仓中采用机械搅拌强制均化,可以加速玻璃液充分均匀混合。为了提高玻璃液的搅拌质量,研发出新型的搅拌机及搅拌棒结构。实践证明,新型搅拌系统的应用减少了基板玻璃的缺陷,提高了产品质量。     

垂直搅拌机使用中的问题及解决方法

介绍该厂垂直玻璃液搅拌机使用过程中出现的一些实际问题及相应的解决方法。经过系列改造 ,垂直搅拌机的使用周期大大延长 ,为国产搅拌机的推广使用积累了成功经验 ,经济效益和社会效益十分显著。     

采用水平搅拌消除色泽不均

普通透明浮法玻璃转产茶色玻璃后产生大量色泽不均，针对产生的原因，采用玻璃液水平搅拌机并通过两次结构改进后，消除了色泽不均现象。     

机械搅拌对玻璃液的均化质量影响研究

通过高温熔融玻璃液的搅拌实验,制作玻璃样品,测定样品不同部位的密度,计算其标准差。探索了搅拌主要工艺参数对玻璃液均化质量的影响规律,提出了机械搅拌主要工艺参数的优化方案。     

一种平板玻璃连续垂直输送系统

提出一种平板玻璃连续垂直输送系统,当原片生产线和深加工生产线在不同楼层时,该系统可实现原片生产线和深加工生产线的自动化连线,将原片生产线的玻璃连续垂直输送至深加工生产线,实现玻璃的全线自动化生产,可有效缩短项目施工周期,显著降低项目投资成本。     

普钙装置立式多桨混合机搅拌器的改进设计

分析立式多桨混合机搅拌器使用寿命短的原因,根据工程实例对搅拌器进行选材、结构改进和技术经济比较,达到搅拌器运行安全可靠、经济合理的目的。     

Vertical pneumatic conveying of particle plugs

Dense-phase pneumatic conveying of solids offers many advantages over dilute-phase conveying. The lower air velocities, and, consequently, lower particle velocities, result in lower pipe wear and lower particle attrition. This paper describes an experimental program that has been undertaken to study the flow pattern of cohesionless solids in vertical transport and to measure the parameters influencing the pressure drop required to move a single plug of solids. Highspeed photographic techniques have been used to observe the flow pattern of polyethylene particles (diameter ? 3 mm) in the vertical riser section of a circulating unit constructed from pipes with an internal diameter of 50.8 mm. The flow pattern resembles that of square-nosed slugging in a fluidized bed. The solids move up as “plugs” of bulk solids that occupy the entire cross-section of the pipe. Particles are seen to “rain” down from the back of one plug and then to be collected by the front of the next plug. Collecting these particles causes a stress on the plug front which is transmitted by powder mechanics forces axially through the plug and radially to the wall. The pressure drop required to move a single plug of cohesionless solids through the transport pipeline was measured as a function of the plug length, particle properties, pipe diameter, and the frontal stress. The results of these experiments are compared with a theoretical model.     

A Comparative Study on a Vertical Stirred Mill Agitator Design for Fine Grinding

Comminution is an energy intensive process. A small change in efficiency can lead to substantial benefits in an overall economy of the process plant. This study focused on the comparison of vertical stirred mill agitator designs. A double helical screw agitator was designed for this purpose. A series of stirred mill experiments were performed with two types of agitator designs a standard pin type and CSIRO’s designed double helical screw stirrers. The effects of operating parameters such as grinding time, stirrer speed, and pulp density on grinding performance was investigated using a magnetite concentrate. Grinding performance was analyzed by considering the product fineness and the energy consumption. The test results show that the grinding time and stirrer speed played a significant role; however, the pulp density had little impact on grinding performance in both cases of agitator designs. The 80% passing target product size of 38 μm was obtained with double helical screw agitator in 20 min of grinding with an expend of 10.53 kWh/t specific energy, whereas, the target product size of 38 μm was achieved with the pin type stirrer at the rate of 21.73 kWh/t. It is evident that grinding in a vertical stirred mill with a double helical screw is more efficient than that using a pin type stirrer in terms of the product size distribution and the specific energy consumption. It is concluded that the double helical screw design provides better energy efficiency compared to the pin type stirrer design. The models were developed for the responses P₈₀ and E_cs. Both models show high regression coefficients thus ensuring a satisfactory of models with experimental data. The model equations developed were then optimized using a quadratic programming to minimize the P₈₀ size at minimum specific energy.     

立式干燥工艺系统与回转干燥工艺系统比较

电石、铁合金等行业需要用干燥的焦丁做原料。早期焦丁价格在500~700元/吨左右,成本比较低;近年来,焦丁价格现在已经达到了1500元/吨以上,焦丁和焦末的差价已达500元/吨以上。随着项目规模大型化的发展趋势,原来传统的回转干燥工艺系统焦炭丁在干燥过程中的破损率过大对生产成本的影响已经不容忽视,立式干燥工艺系统由于其低破损率在电石等行业日渐倍受青睐。     

INNOCERAM陶瓷在玻璃水平钢化炉中的应用

介绍了INNOCERAM陶瓷在玻璃水平钢化炉中的创新应用,并将INNOCERAM陶瓷与其它材料做了比较研究.     

一种新的丙烯酸高级酯制备方法

用熔融酯化方法制备了丙烯酸高级酯 ,研究了单体量比、催化剂、阻聚剂、反应时间、反应温度等因素对该酯化反应的影响。确定用该法制备丙烯酸高级酯的适宜工艺为 :n(丙烯酸 )∶n(十八醇 ) =1 2∶1 0 ,m(对甲苯磺酸 )∶m(总单体 ) =1 0∶10 0 0 ,m(对苯二酚 )∶m(总单体 ) =0 5∶10 0 0 ,采用分段升温方法 ,于 110～ 140℃回流条件下反应 6h ,高级酯相对单体总质量的收率可达 90 %以上。测定了丙烯酸高级酯的熔点、沸点和元素组成 ,用红外光谱和核磁共振谱表征并证实其结构特征与用常规溶剂酯化法制备的产物并无明显差异     

基于单片机的立式干燥器控制系统的研究

在陶瓷墙地砖坯体干燥过程中,坯体在干燥器内的运动至关重要;对基于单片机的立式干燥器控制系统进行了研究,并对立式干燥器的结构以及控制参数和流程进行分析,使干燥过程有序的进行,从而提高生产率和产品质量.     

传感技术在立式刮刀离心机自控系统中的应用

为实现立式刮刀离心机自控系统的全自动化,在系统中采用了转速、振荡、填充、温度和位置检测传感技术。介绍了这些传感技术的工作原理、使用情况与应用效果。     

采空区上快速建立井新技术研究与应用

聚隆矿业有限公司原矿井地面工业广场压煤约200万t,为解放出老工业广场及井筒压煤,通过论证,确定在原风井附近受采空区影响区域新建立井井筒及工业广场。采空区上面快速建井技术在聚隆公司成功应用,拓宽了立井施工条件的适用范围,在条件类似的矿井具有广泛的推广应用前景。