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

本研究提出了一种高尚的技术，可以通过引入导电珠的流化床来使电子均匀的电子均匀。该技术应用于模制陶瓷和食物的高级，快速和选择性的干燥，并且通过基本检查评估了性能。通常，众所周知，流化床中颗粒的运动表现非常随机。如果选择用于流化颗粒的导电珠，则将在珠子的表面朝着磁场的随机方向和均匀性反映在磁场的随机方向上，将得到改善。另一方面，微波炉内部热量的影响可能会增强湿介质中水分的内部迁移。微波炉还具有特定特征，因此诱导的热性能取决于溶剂的电磁特性。水具有2.45 GHz的有效吸收的微波能量，该频率在HAR中……与水分子的旋转量子能量更为莫尼，并积极地激发能量水平。通过有效吸收微波能量的分子的量子兴奋，这种性能可以实现气体和液体之间的不平衡状态。人们认为，通过这种效果，可以选择性经济和多组分溶液的干燥。在这项工作中，内部加热对干燥引起的应变压力的行为的影响以及成型为板中的陶瓷变形以及干燥特征的理论是初步研究的。确认了有效性。检查了导电珠的流化运动与微波场轮廓之间的相互作用。使用常规风扇成功地改善了轮廓的均匀性，而不是微波能量的干扰。高岭土的微波炉干燥成板中的微波与热空气加热的行为不同，这使干燥的完成时间短，而没有裂纹形成。此外，对代表性的两种成分的水和2丙醇通过微波炉进行了蒸馏检查。证实水比蒸气中的平衡组成更有选择性地蒸发。较少的