【作者】 俞云良；

【导师】 计建炳；

【作者基本信息】 浙江工业大学 ， 化学工程， 2004， 硕士

【摘要】 旋转床(又称超重机或RPB)是八十年代初发展起来的一种利用离心力场强化传质与反应的、新型的、高效化工分离设备，它可用于吸收、解吸、精馏、萃取等一些分离过程，在工业上有着极为广阔的应用和发展前景。前人对旋转床的流体力学性能、传质性能和功率消耗进行了大量研究，但绝大部分以填料式旋转床为主，且以吸收、脱吸等单元操作居多，而应用于精馏的研究甚少。 折流式旋转床是新近开发的一种超重力旋转床，其核心部分是折流式转子，由动盘和静盘组成，在动、静盘上按一定间距同心安装了一定数量的折流圈，然后将两个盘嵌套在一起形成供汽、液流通的折流式通道。这种结构的折流式转子可使液体不断碰撞雾化，汽液停留时间适当延长，液体分布均匀，这些均是折流式旋转床的传质效率显著提高的重要原因。 折流式旋转床经小液量下的试验表明，其具有较好的分离效果，有望应用于精馏。本文主要是在具有适合工业应用意义的操作条件下进行了冷模和热模试验，研究网孔式和百叶窗式两种不同结构的单层折流式旋转床的气相压降特性和电功率消耗特性，以及双层折流式旋转床的传质性能。实验结果表明： (1)折流式旋转床的干床压降大于湿床压降；气相压降随气量和转速的浙江工业大学硕士学位论文摘要增大而增大，随液量的加入而迅速减小，当液量继续增大到一定值时，气相压降随液量的变化不大。(2)折流式旋转床的电功率消耗随气体流量增大而增大，但趋势比较平缓。在小液体流量下，电功率消耗有随气体流量增加先略有减小后又增加的过程，随液体流量和转速的增大而增大，液体流量和转速是影响电功率消耗的敏感参数。(3)全回流下，网孔式和百叶窗式两种结构的折流式旋转床的传质效率均随回流液量的增加而下降，随旋转速度的增加而增加，随后变化不大，但百叶窗式旋转床受液量的影响比较敏感。(4)网孔式折流式旋转床在回流量大于ZOOL/h、转速在I000r/min左右时，理论板为9一10块左右。(5)得到了网孔式和百叶窗式两种结构折流式旋转床气相压降和电功率消耗对气体流量、液体流量、转速的经验关联式，回归结果与实验结果比较吻合，误差在士10%左右。(6)通过对网孔式和百叶窗式两种结构折流式旋转床性能的比较可以得出，网孔式折流式旋转床的综合性能要优于百叶窗式，故在工业应用上宜采用网孔式折流旋转床，转速宜在I000r/min左右。更多还原

【Abstract】 A rotating packed bed (also called Higee or RPB) using centrifugal force to intensify mass transfer and chemical reaction, is a new type of high-performance equipment which was developed in the early eighties. It has wide application and bright prospect in industries, such as absorption, stripping, distillation, extraction and other separation processes. Some researches on performance of hydrodynamics, mass transfer and power consumption of the rotating bed have been studied, but mainly on absorption and stripping unit operation in the PRB, few researches on distillation.The zigzag rotating bed is a type of the latest developed Higee ,the key part is zigzag rotator. The rotator consists of immobile disk and rotational disk. A number of circular baffle plates are homocentrically installed on the immobile disk and rotational disk respectively at certain distance, inlaying the two disks together to form zigzag channels for liquid and gas flowing. Gas-liquid mass transfer intensification is primarily based on the results of great effective mass transfer area generated in liquid constant atomization, the proper residence time of gas and liquid, and the uniform distribution of the liquid.The laboratory experiments of the zigzag rotating bed showed thatthe separation effect of the unit was better, it is hopeful that the zigzag rotating bed is applied to distillation. In this thesis , the gas pressure drop and power consumption characteristics of the single-layer mesh and shutter types zigzag rotating bed were studied through the cold model (air /water system) test, and the mass transfer performance of the two structure two-layer zigzag rotating bed were investigated through the hot model (real system) test, under the operation conditions which was suitable for industry applying. The experimental results show that:(1) The pressure drop of the dry zigzag rotating bed is higher than that of wet one. The pressure drop increases when the gas flow rate and rotating speed enhanced, however the pressure drop initially decreases rapidly then keeps constantly almost when liquid introduced to the rotor.(2) The electric power consumption increases slowly as gas flow rate enhanced, however under low liquid flow rate condition, there is a process that the electric power consumption initially decreases slightly, then increases again with the gas flow rate enhanced, both liquid flow rate and rotating speed are sensitive factor of the electric power consumption.(3) The mass transfer efficiency of the two-layer mesh and shutter type zigzag rotating bed decrease with liquid flow rate, and increase with rotating speed then vary a little under total reflux and the same operation conditions. But liquid flow rate largely influences the mass transfer efficiency of shutter type.(4) 9 to 10 theoretical trays can be obtained when the reflux is over 200L/h and rotating speed is 1000r/min in the mesh type zigzag rotating bed.(5) The empirical correlation equation of the pressure drop and the electric power consumption of the two types zigzag rotating bed was derived by regression concerning on gas flow rate, liquid flow rate and rotating speed. The results of regression are agree well with those of experiment about a relative error of 10%.(6) The characteristics of the mesh type zigzag rotating bed are better than those of shutter type. So the mesh type is suitable, and the optimum rotating speed is about 1000r/min in industries.更多还原