共查询到17条相似文献,搜索用时 63 毫秒
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流化床喷雾造粒颗粒强度的影响因素研究 总被引:1,自引:0,他引:1
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。 相似文献
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液相烧结碳化硅喷雾造粒工艺控制 总被引:5,自引:0,他引:5
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. 相似文献
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通过研究碳化硅及其烧结助剂碳化硼、纳米碳黑在水溶液中的共分散性.制得了分散性良好的混合浆料·研究结果发现碳化硅及其烧结助剂碳化硼、纳米碳黑在碱性条件下可以实现共分散.同时聚乙二醇(PEG)作为浆料的分散剂和粉体的粘结剂,PEG含量对碳化硅喷雾造粒有重要的影响,结果显示随着PEG含量的增加,喷雾造粒的球状颗粒形貌趋于规整,粉体的流动性增加. 相似文献
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Michael Jacob 《流程工业》2013,(4):70-72
很好的流动性、无粉尘和很好的定量控制——这些是利用流化床喷雾造粒或者喷雾干燥造粒工艺所生产出产品的特性。生产厂家可以利用喷雾造粒工艺有针对性地控制工业产品的外观,同时保证产品的性能。 相似文献
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影响喷雾造粒Al2O3/nano-TiO2复合陶瓷粉体流动特性的流变学因素研究 总被引:3,自引:0,他引:3
本文研究了分散剂、粘结剂及固相含量等流变学因素对喷雾造粒粉体流动性的影响.结果表明,Al2O3/3wt.%nano-TiO2浆料具有剪切变稀的特性,有利于复合陶瓷粉体的喷雾造粒.当固相含量为浆料总质量的60%,分散剂和粘结剂分别为固相质量的0.3%和1.0%时,浆料具有合适的粘度和最佳的分散稳定性,喷雾造粒所得到的粉体形状为球形或近球形,具有较高的松装密度和良好的流动性,满足用于热喷涂的需要. 相似文献
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A. Gianfrancesco C. Turchiuli E. Dumoulin S. Palzer 《Particulate Science and Technology》2013,31(5):415-427
The spray drying process consists of a fast convective drying of liquid droplets by hot air. Initially, the water activity (aw) of a drop is close to 1. During drying, the drop surface aw decreases while viscosity increases until reaching a sticky rubbery state before further drying. This can be observed for products such as carbohydrates, leading to particles sticking on walls (product losses) or to adhesion between particles leading to agglomeration. In this study, particle stickiness was investigated in a cocurrent pilot spray dryer by measuring drying air properties (temperature and relative humidity) at different positions. This allowed describing the evolution of temperature and mean water content of the drying drops. Two model products (maltodextrin DE12 and DE21) were spray dried varying process parameters liquid flow rate (1.8, 3.6, and 5.4 kg/h), air temperature (144°, 174°, and 200°C), airflow rate (80–110 kg/h), and rotary atomizer speed (22,500–30,000 rpm). The two products exhibit different drying behaviors in relation to their affinity towards water (sorption isotherms) and glass transition temperature evolution with aw (stickiness). Depending on drying conditions and product, the drop stickiness was observed very rapidly, close to the atomizer, or later, along the chamber. This approach can be used to identify conditions and positions corresponding to sticky particles. 相似文献