共查询到17条相似文献,搜索用时 187 毫秒
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在聚酯切片生产过程中,USG 600-1型立式水下切粒机曲停车板位置调整对于切粒外形质量的影响因素常常被忽视,从而延误了故障判断和排除时间,导致切片因外观质量降等,造成经济损失。从生产实践的角度,对这种影响因素的发生和判断过程进行了分析,并提出相应的解决办法。 相似文献
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水下切粒是生产K树脂的重要工序之一。文章对K树脂在水下切粒工序中影响切粒成败及影响粒料质量的因素进行深入的分析,根据生产中的实际经验总结出影响水下切粒成败及影响粒料质量的因素,并摸索出一套稳定产品质量的方法,有效地保证了树脂的产品质量。 相似文献
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1 切粒水系统故障原因分析在聚酯生产中 ,清洗水下切粒机水系统时 ,发现管道内的敷着物质为切粒时产生的大量粉尘的粘结物。其产生的原因有 :铸带头出来的熔体带条在空气中被水急剧冷却时产生的降解物及切粒时产生的粉尘不断在水系统中循环 ,水温也因换热而增加 ,有利于菌类繁殖 ,冷却水中的细菌形成粘液层 ,对切粒时带来的沉积在管道、设备内的粉尘等物质起粘合剂和结合剂作用 ,菌类微生物在水中粘附在管壁、设备上不断生长 ,形成越来越多的粘性物质 ,导致减少切粒水流量 ,堵塞水系统。生产中为降低水的消耗成本 ,提高水循环利用率 ,尽量… 相似文献
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基于CFD?DEM耦合方法,研究了颗粒在水室内的流动状态,分析了不同刀盘转速、粒子水通入量和水室出口角度对造粒过程的影响,发现提高刀盘转速、增加粒子水通入量和水室出口倾斜一定的角度都有利于水室内颗粒的排出。进一步研究了颗粒与碎屑在水室内的流动,发现在水室出口处二者的流动基本呈现出一定的分离角度。 相似文献
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目前压滤式水电解槽极板普遍采用球形凹凸组合结构,目的是能够增强流动的扰动程度,使电解液分布更加均匀。为了进一步改善流场分布,将五种不同形式的凹凸组合结构与电解单元极板结构相结合,采用数值模拟方法分析并比较了不同凹凸组合结构通道内部的流动特性和流场分布特点。结果表明,五种结构通道内的速度分量uz均存在负速度分布区域,且该区域内的湍动能值较大;局部涡旋均表现为凹陷结构边缘处向凹陷内部发展的涡旋运动,涡旋流动细节与凹凸结构形式密切相关;平均涡通量及涡量值的分布表明凹凸结构主要影响局部区域的涡旋强度,对整体流动影响较小;流场分布均匀性与凹凸结构迎风面的形状尺寸等因素有关,其中Case D泪滴形结构的流场分布均匀性最好。 相似文献
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Constructing the microcellular structure in the conductive polymer composites (CPCs) is a promising approach to improve the sensitivity and durability of the piezoresistive sensor. Selectively placing the conductive fillers, to form the segregated network between the polymer region, can effectively improve the electric performance of CPCs. However, few researches have focused on the influence of the polymer bead size on the segregated network and the large-scale production of spherical polymer beads with low cost is still difficult to realize. Herein, plenty of regular-shaped poly(butylene adipate-co-terephthalate) (PBAT) beads were manufactured through underwater pelletizing process, which was further coated with carbon nanotube (CNT) particles with the assistance of ball milling technology, and eventually the sensor was successfully fabricated through supercritical carbon dioxide (scCO2) bead foaming technology. The lightweight and flexible sensor exhibited the uniform cell structure with the mean cell size of 51.0 μm and cell density of 3.9 × 108 cells/cm3 when the pelletizing cutter speed was 2500 rpm and the foaming temperature was 117.5°C. And the conductivity of the sensor reached 6.5 S/m incorporated with 3 wt% CNT, which possessed high sensitivity, good stability and long-term durability, attributed to its excellent microcellular structure and segregated conductive network. 相似文献
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Czeslaw Strumillo Ireneusz Zbici
ski Iwona Smucerowicz Clayton Crowe 《Chemical Engineering and Processing: Process Intensification》1999,38(4-6):593-600
The paper presents a theoretical and experimental analysis of a pulse combustion spray drying system. Measurements of the velocity flow field inside the drying chamber and extensive tests on drying and water evaporation were carried out for various feed rates and operating parameters of the pulse combustor. Each test included the analysis of temperature distribution in the dryer, evaporation level and sprayed material structure. LDA and PDA techniques were employed to determine the character of pulsating flow in the chamber, amount of water evaporated and to perform a profound analysis of spray structure. Experimental results show an intensive and efficient drying process. An attempt was made to perform theoretical predictions of velocity and temperature distribution in the drying chamber. The CFD technique was used to calculate time-dependent flow in the chamber. Results show vanishing velocity, pressure and temperature oscillations along the length of the drying chamber. Temperature oscillations decline faster than oscillations of pressure and velocity. Satisfactory agreement between calculations and experimental results was found in certain regions of the drying chamber. Discrepancies might be caused by simplification of the system geometry and flow pattern which were assumed to perform calculations in reasonable time. 相似文献
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分析过磷酸钙混化工段化成室内切削机传动竖轴外伸轴颈断裂原因,改进竖轴轴头结构和提高轴头表面加工精度,有效减小轴颈部位的应力集中,提高疲劳极限,延长了竖轴使用时间,并改用焊接修复断轴的方法,抢修时间由原来的4~5d减少到12h。 相似文献
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