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SELECTIVE DRYING OF MULTICOMPONET SOLVENTS IN MOLDED MEDIA HEATED BY MICROWAVE UNIFORMED WITH CONDUCTIVE PARTICLE FLUIDIZATION

通过微波加热和导电颗粒流化均匀的模制介质中多组分溶剂的选择性干燥

基本信息

批准号：
12650749
负责人：
ITAYA Yoshinori
金额：
$ 2.05万
依托单位：
NAGOYA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

The present research proposed a noble technique to make the electromagnetic filed of microwave uniform by introducing fluidized beds of electrically conductive beads. The technique was applied to advanced, rapid and selective drying of molded ceramics and foods, and the performance was evaluated by a fundamental examination. It is generally known that the motion of particles in fluidized bed behaves remarkably randomly. If electrically conductive beads are chosen for the fluidized particles, microwave is reflected on the surface of the beads toward a random direction and uniformity of the time-averaged profile of the field will be improved. On the other hand, the effect of the internal heat of microwave may enhance the internal migration of moisture in wet media. Microwave has also a specific feature so that the induced heat performance is dependence on the electromagnetic properties of solvent. Water absorbs effectively the microwave energy with the frequency 2.45 GHz, which is in har … More mony with the rotation quantum energy of water molecule and excites actively the energy level. This performance may achieve a unequilibrium state between gas and liquid by quantum excitation of molecules absorbing effectively the microwave energy. It is considered that selective evaporation and drying of multi component solvents will be possible by this effect.In this work, the influence of internal heating on the behavior of drying-induced strain-stress and deformation of ceramics molded into a slab as well as the drying characteristic is preliminarily investigated theoretically. The effectiveness is confirmed. The interaction between fluidization motion of conductive beads and microwave field profile was examined. The uniformity of the profile was improved successfully rather than disturbance of microwave energy using the conventional fan. Microwave drying of kaolin molded into a slab showed a different behavior from the drying characteristic by hot air heating, and it made the drying completion time short without crack formation. In addition, distillation examination was performed for a representative two components solvent of water and 2-propanol heated by microwave. It is confirmed that water evaporates somewhat more selectively than the equilibrium composition in the vapor. Less

本研究提出了一种通过引入导电珠流化床来使微波电磁场均匀化的高尚技术。该技术应用于先进的，快速的和选择性干燥的成型陶瓷和食品，并通过基本检查的性能进行了评估。众所周知，流化床中颗粒的运动具有明显的随机性。如果选择导电珠粒作为流化颗粒，则微波在珠粒表面上朝向随机方向反射，并且场的时间平均分布的均匀性将得到改善。另一方面，微波的内热效应可能会促进湿介质中水分的内迁移。微波还具有一个特殊的特点，即诱导热性能取决于溶剂的电磁性质。水对频率为2.45 GHz的微波能量有较强的吸收能力， ...更多信息与水分子的转动量子能发生作用，积极地激发能级。这种性能可以通过有效吸收微波能量的分子的量子激发来实现气液之间的非平衡状态。本文从理论上初步探讨了内加热对陶瓷坯体干燥诱导应变-应力和变形行为以及干燥特性的影响。有效性得到证实。研究了导电珠流化运动与微波场分布的相互作用。采用传统的风扇，在不干扰微波能量的情况下，成功地提高了型面的均匀性。高岭土成型后的微波干燥表现出与热风干燥不同的特性，干燥完成时间短，无裂纹形成。此外，对微波加热的水和2-丙醇的代表性双组分溶剂进行蒸馏检查。证实了水的蒸发比蒸汽中的平衡组成具有更高的选择性。少