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As a high gravity (HIGEE) unit, the rotating packed bed (RPB) uses centrifugal force to intensify mass transfer. Zigzag rotating bed (RZB) is a new type of HIGEE unit. The rotor of RZB consists of stationary discs and rotating discs, forming zigzag channels for liquid-gas flow and mass transfer. As in RPBs, some hydrodynamic behavior in RZB is interesting but no satisfactory explanation. In this study, the experiments were carried on in a RZB unit with a rotor of 600 mm in diameter using air-water system. The gas pressure drop and power consumption were measured with two types of rotating baffle for RZB rotors, one with perforations and another with shutter openings. The circumferential velocities of gas were measured with a five-hole Pitot probe. The pressure drop decreased rapidly when the liquid was introduced to the rotor, because the circumferential velocity of the liquid droplets was lower than that of the gas, reducing the circumferential velocity of gas and the centrifugal pressure drop. The power consumption decreased first when the gas entered the RZB rotor, because the gas with higher circumferential velocity facilitates the rotation of baffles. 相似文献
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1 INTRODUCTIONAtpresent,tremendousamountoforganicwasteshasbeenproducedinmanybranchesofindustryeachyear.Manyofthemhavehazardouseff 相似文献
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采用乙醇-水物系,在常压全回流条件下,对网孔板式(转子Ⅰ)和百叶窗式(转子Ⅱ)两种转子结构的喷射式超重力旋转床和折流式旋转床(RZB)进行精馏实验,并建立了旋转床理论塔板数和气相总体积传质系数(KGae)的关系式。实验结果表明,3种结构旋转床转子的每米理论塔板数均随转子转速增加而增大,且转子Ⅱ和RZB转子随气相表观动能因子(F因子)增大出现峰值;转子Ⅰ的每米理论塔板数最大为40.7块,转子Ⅱ的每米理论塔板数最大为40.0块;在转子转速为1 040r/min、F因子为1.1m.s-1(kg.m-3)0.5时,转子Ⅰ的比压降是RZB转子的10.0%,转子Ⅱ的比压降是RZB转子的13.6%;转子Ⅰ和转子Ⅱ的KGae随F因子的增大而增大。 相似文献
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李肖华 《浙江工业大学学报》1997,25(4):330-335
基于Eyring纯液体粘度方程的改进式,应用局部组成模型,建立了一个二元液体混合物粘度关联式。对22个体系39套恒温粘度数据进行了关联,相对平均偏差为0.38%,结果令人满意。 相似文献
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PI气凝胶是一种多孔吸声材料,但对中低频声波的吸声效果欠佳。为了提高PI气凝胶对中低频声波的吸声性能,引入不同粒径(29μm、40μm、55μm)的玻璃微珠(HGM)作为复合相,采用溶胶-凝胶、CO2超临界干燥等工艺制备了中低频声波吸声性能良好的HGM/PI气凝胶复合材料,研究了复合材料的性质(比表面积、收缩率、密度)、微观结构以及吸声性能,分析了HGM的粒径、添加量和复合材料本身厚度对复合材料吸声性能的影响。结果表明:复合材料的密度(0.156~0.208 g/cm3)、比表面积(107.8~399.8 m2/g)与HGM的堆叠密度和添加量有关。在500~6 300 Hz范围内,30 mm厚的空白样品(PI气凝胶)的吸声系数峰值为0.39(3 150 Hz),添加HGM后,相同厚度的复合材料在1 000~2 500 Hz出现峰值,较空白样品向低频方向移动,峰值大小为0.56~0.87,均高于0.39。对比发现,在1 000~2 500 Hz范围内,粒径为29μm的HGM与PI气凝胶复合后的材料吸声性能最好,粒径为40μ... 相似文献