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对聚酯切片的结晶─干燥工艺要求、影响干燥速度和干燥切片含水量的因素等进行了讨论,指出干燥速度决定於干燥的温度,切片干燥后的含水量则决定於环境的温度(以露点高低表征),从结晶熔点工艺温度关系说明了充填型干燥设备结块问题。 相似文献
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碱溶性聚酯切片的结晶与干燥性能研究 总被引:1,自引:1,他引:0
通过对碱溶性聚酯切片在三种不同结晶工艺条件下的结晶性能的研究实践,分析了三种结晶方式工艺控制及其特性,并对结晶后碱溶性聚酯切片的干燥工艺控制及其影响条件进行研究分析,使连续结晶、干燥后的碱溶性聚酯切片能满足海岛纤维生产的工艺要求。 相似文献
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涤纶长丝生产线中的干燥设备性能极大地影响着生产的正常进行。聚酯切片干燥机均使用干空气作为干燥介质。根据使用气源的不同分为“高压 (压缩空气 )小风量”及“低压 (风机供气 )大风量”两种机型配置。国外机都采用压缩气源 ,国产机两种都有。南通合成纤维厂先后投产的多条生产线中配置有Zimmer干燥塔、罗森干燥塔、国产低压大风量充填干燥塔。其中Zimmer公司干燥机已使用2 0多年 ,由于设备中相关配套设备老化、性能下降 ,经常需要维修 ,影响产品开发。国产干燥塔采用低压大风量 ,使用性能不理想 ,配置在FDY生产线造成生产不正常 ,影响… 相似文献
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从切片干燥设备的发展概况及BM干燥设备的改进过程出发,着重阐述了脉冲输送系统、结晶干燥系统的工艺流程及工作原理,并分析了主体设备的结构,最后给出了该机型的特点。 相似文献
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本文通过生产实践,对Karl Pischer's(缩写K.F)聚酯切片干燥装置生产过程中影响切片预结晶质量的主要工艺参数进行了分析探讨。 相似文献
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关于“聚酯切片干燥除湿机”的研究 总被引:1,自引:0,他引:1
本文介绍采用压缩空气作气源,经国产冷冻干燥机和分子筛无热再生吸附二级除湿,获得露卢、温度-80℃低露点干空气.供聚酯切片干燥,可获得含水率为20±5PPm的干切片. 相似文献
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介绍了聚酯切片纺丝工艺中较为常见的2种切片干燥方式——预结晶充填干燥和真空转鼓干燥,比较了它们的优缺点,并通过实例说明,在不同的生产规模及生产条件下,应根据实际情况,合理选用切片干燥方式,以满足生产要求。 相似文献
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张木;陈延明;陈宏;司春雷;高启升 《中国塑料》2010,24(11):39-42
通过对2种不同瓶用聚酯切片(市售瓶用聚酯切片和辽阳石化公司的瓶用聚酯切片)进行傅里叶变换红外光谱、热失重、热台偏光显微镜、差示扫描量热等的对比分析,详细研究了2种瓶用聚酯切片的结晶行为。结果表明,瓶用聚酯切片应具有适中的结晶能力,结晶速率过大或结晶度过高均可导致聚酯瓶产品的耐热性能下降;与市售瓶用聚酯切片相比,辽阳石化公司的瓶用聚酯切片的结晶速率较大,具有较高的热结晶温度。 相似文献
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K. S. ONG 《Drying Technology》2013,31(4-5):999-1009
ABSTRACT The performance of three different types of dryers for the hot air drying of sawn-limber planks are compared. These were the electric resistance dryer, solar dryer, and the dehumidifier dryer. Whilst the electric and solar dryers depended only upon hot air for drying, the dehumidifier dryer relied on hot dehumidified air. The results of investigations carried out on timber drying employing these three types of dryers in the Engineering Faculty are compiled and compared here in this paper. The results showed that the electric dryer produced the fastest drying lime and lowest moisture content, followed by dehumidifier drying. The solar dryer achieved a lower moisture content and a faster drying rate compared to natural drying, although the difference in drying times was marginal. 相似文献
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ABSTRACT An experimental study describing the mechanisms of drying of a thick layer of natural crumb rubber is presented. The evolution of the ternventure profiles of the crumb and profiles of temperature and relative humidity of intergranular air and water content of crumb arc presented. These evolutions enable understanding of the internal mechanisms involved and lead to practical recommendations for the management of industrial driers. 相似文献
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干燥过程中PVC树脂水含量的控制 总被引:1,自引:0,他引:1
介绍了影响PVC树脂干燥的主要因素,分析了旋风干燥床出口温度(T1)标准偏差、工序能力指数及作直方图来推算收集数据的各种特征值,如果T1的设定值与实际值发生偏移,要采取相应措施,以免影响PVC树脂质量。 相似文献
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阐述了采用"悬浮干燥过程优化控制技术"改造SPVC干燥装置的情况。运行数据表明,该技术提高了旋风干燥塔塔温控制精度、悬浮树脂成品的优级品率及挥发物指标。 相似文献
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As a new compressed air-drying method, the compressed air dehumidification using a pressurized liquid desiccant was proposed in our previous study. The pressurized dehumidifier is a complex and core component of the drying system. The mass transfer performance between the compressed air and LiCl aqueous solution is experimentally studied in a counter-flow pressurized dehumidifier filled with structured packing. The humidity ratio of outlet compressed air, vapor removal of processed compressed air, moisture removal rate, and dehumidification efficiency were selected as the performance indices. The results show that the minimum humidity ratio of processed compressed air could reach 0.23 g/kg under 0.71 MPa. Compressed air-drying performance could be remarkably enhanced through increasing the air pressure and liquid desiccant inlet concentration while the influence of liquid desiccant temperature is negative. Furthermore, in order to ensure high compressed air-drying performance, reduce the power consumption of the air compressor and liquid desiccant pump, and the possibility of carryover, the optimum ratio of liquid to compressed air flow rate is recommended to be around 1.5 under pressure around 0.50 MPa. Meanwhile, the energy consumption for per-gram moisture removal of a liquid-desiccant-based compressed air-drying system can reach 1.42 kJ/g lower than cooling dehumidification under 0.3 MPa, which is 16.0% lower than a compressed air-cooling dehumidification system. 相似文献
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G.C. Misener 《Drying Technology》2013,31(5):1107-1114
ABSTRACT A comparison of the drying efficacy of ambient-air drying of large forage bales was made between positive and negative pressure systems. Both systems effectively dried the bales to the desired average moisture content, but regions of higher moisture content within the bales were measured with the two systems. Energy consumption as expressed as the ratio of the energy consumed/weight of moisture removed was similar for both drying systems. Final configuration of the drying system will depend on whether heat is required to speed the drying process in order to meet the capacity of the harvesting system. 相似文献