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木材微波干燥的应用与研究动态 总被引:3,自引:0,他引:3
分析了木材微波干燥的机理和优点,介绍了国内外木材微波干燥的研究与应用情况,指出木材微波干燥是一项具有广阔发展前景的新技术。建议今后加强木材微波干燥理论、干燥设备、干燥工艺、微波联合干燥技术等的研究工作。 相似文献
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微波技术在蚕茧干燥中的应用研究 总被引:2,自引:0,他引:2
微波干燥是近年来被广泛应用的一项新技术。在阐述微波干燥原理、特点及微波干燥蚕茧机理的基础上,就近年来微波技术在蚕茧干燥方面的应用研究及其进展作了综述,分析了微波干燥蚕茧应用研究中存在的问题,探讨了微波技术在蚕茧干燥方面的应用前景。 相似文献
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微波技术在种子干燥方面的研究进展 总被引:2,自引:0,他引:2
干燥是种子加工的重要环节,微波干燥技术具有独特的优点和特点。近十几年来,国内外在种子微波干燥方面的研究取得了不少成果,而有关这方面的综述却未见报道。本文在阐述微波干燥机理和特点基础上,就近年来国内外微波技术在种子干燥方面的研究进展作一综述,并探讨微波技术在种子干燥方面的应用前景。 相似文献
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文章主要介绍了微波的原理,微波干燥技术的特点。归纳了微波干燥与及微波相关的联合干燥等方法在食品工业中的最新应用,并对微波干燥在食品工业中的应用前景进行了展望,旨在为今后的微波干燥工业发展提供指导意义。 相似文献
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《Drying Technology》2013,31(8):2063-2079
A new drying method of combined superheated steam and microwave drying is being proposed. The drying rates of sintered glass beads in combined superheated steam and microwave drying are experimentally and theoretically investigated. Drying experiments have been carried out in a waveguide where a standing wave is formed to uniformly heat a small sample. Concerning drying rate curves in combined superheated steam and microwave drying, a distinct constant rate period has been observed. For the falling rate period, high drying rates have been observed. For both periods, the drying rates in combined superheated steam and microwave drying are higher than those in superheated steam alone. Also, in comparison with the results of combined nitrogen and microwave drying, the normalized drying rates in combined superheated steam and microwave drying are higher than those at less than the critical moisture content in combined nitrogen and microwave drying. Moreover, theoretical drying rates for the falling rate period (predicted by a modified receding evaporation front model) in combined superheated steam and microwave drying, are in good agreement with the observed drying rates. The combined superheated steam and microwave drying method can attain higher drying rates under mild external conditions. 相似文献
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干燥预处理对油页岩的利用具有重要的意义,微波干燥是一种快速、高效和节能的干燥方式。在家用微波炉改造基础上搭建了微波干燥实验台,研究了不同微波功率对柳树河油页岩微波干燥特性的影响。并采用单项扩散模型等13个薄膜干燥模型等对微波干燥分别进行动力学分析,结果表明:微波干燥所需的时间远小于传统干燥所需的时间;微波干燥速率要远大于传统干燥干燥速率;油页岩微波干燥过程适用于双项扩散的半经验模型,油页岩微波干燥机理为湿分(液体或蒸气)双项扩散控制过程;300、400和550 W三个功率干燥时能耗相差不大。为了以较少的能耗达到相同的干燥效果,对于柳树河油页岩,以功率550 W干燥为佳。 相似文献
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Microwave convective drying of plant foods is a promising process due to the shorter drying time and better product quality. High microwave power decreases the drying time but causes charring of the product. In this work, microwave drying under constant and variable microwave power were compared. Temperature-sensitive products, such as plant foods, are especially affected by microwave power during the final drying period. Therefore, drying at variable microwave power was found to be a more suitable drying process. Air (temperature and velocity) has an important role during microwave drying, not only as carrier of evaporated moisture but also as it contributes to a more homogeneous and faster drying. 相似文献
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《Drying Technology》2007,25(7):1149-1153
Microwave convective drying of plant foods is a promising process due to the shorter drying time and better product quality. High microwave power decreases the drying time but causes charring of the product. In this work, microwave drying under constant and variable microwave power were compared. Temperature-sensitive products, such as plant foods, are especially affected by microwave power during the final drying period. Therefore, drying at variable microwave power was found to be a more suitable drying process. Air (temperature and velocity) has an important role during microwave drying, not only as carrier of evaporated moisture but also as it contributes to a more homogeneous and faster drying. 相似文献
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本文利用微波干燥法进行卫生陶瓷坯体干燥试验,探究微波可以实现对卫生陶瓷快速干燥的原因。在此基础上,对围绕着微波设备大型化、连续化中面临的关键技术及微波干燥电耗相对较高等技术进行攻关,开发了卫生陶瓷微波干燥辊道窑,并在实际工厂使用。结果表明:微波干燥过程实现了沿坯体纵向与沿坯体局部区域横向的均匀干燥及微波干燥能显著提高干燥的内扩散速率,最终实现对卫生陶瓷的快速干燥;采用微波、热风耦合加热技术能显著降低微波干燥电耗;开发的卫生陶瓷微波干燥辊道窑,可极大缩短干燥周期,降低场地占地面积,提高干燥合格率。 相似文献
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针对玉米热风干燥中存在的问题。运用自制的微波干燥试验设备。采用不同的质量比功率和加热时间及配套的工艺流程。研究了玉米微波干燥特性及干燥条件对干燥品质、能耗的影响;分析了微渡干燥玉米过程中单位质量功耗、温度、平均失水速率与玉米籽粒发芽率、爆腰率和淀粉得率的关系;确定了影响微波干燥玉米的工艺参数和玉米微波干燥的合理工艺流程。研究结果表明:玉米微波干燥主要处于恒率干燥阶段,应用微波技术既能快速而经济地对玉米籽粒进行干燥,又能保持其种用价值,且有利于改善其品质。 相似文献
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《Food and Bioproducts Processing》2007,85(3):255-263
Drying of biological materials such as fruits and vegetables provides shelf-stable commodities ensuring food security and ease of distribution. There exists numerous drying processes available for the adequate drying of bio-materials. Applying microwave energy to a drying process provides an efficient means of transferring energy for moisture removal. A review of recent microwave assisted drying applications is presented here along with research results on drying of carrots under varying microwave power modes and the comparative drying of mushrooms by microwave/convection and microwave/vacuum. 相似文献
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Sahbi Ouertani Lamine Hassini Soufien Azzouz Sadoth Sandoval Torres Ali Belghith Ahmed Koubaa 《Drying Technology》2013,31(10):1234-1242
The impact of microwave drying on the quality of dried wood remains unclear. Particular attention should be paid in order to optimize the combined microwave and convective drying process. In this study, a comprehensive internal heat and mass transfer model was developed and numerically implemented in order to simulate and understand the physical phenomena occurring inside Jack pine wood during a combined microwave and convective drying process. The model was validated on the basis of the average moisture content curves for drying scenarios at various microwave power levels. According to the simulations results, an increase in microwave power significantly decreases the drying time of Jack pine wood and increases its internal gas pressure, which increases the risk of cracking. However, compared to purely conventional convective drying, combined microwave and convective drying at medium microwave power and air temperature significantly reduces the drying time and maintains the internal gas pressure at reasonable values. At these conditions, the risk of cracking will be diminished. This last result was checked via experimental measurements of the sample strength dried at different microwave power levels. From this study, we can consider that for Jack pine wood, combined microwave and convective drying is a more efficient technology compared to classical convective drying. 相似文献
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湿法炼锌产出的中和沉铁渣作为重要的二次资源,含有大量的铁、锰、锌等有价金属,具有较高的综合回收利用价值。回收有价金属前需对中和铁渣进行脱水预处理,基于回转窑干燥法存在干燥时间长、干燥效率低、二次污染等问题,本文开展了微波干燥湿法炼锌中和铁渣实验研究,考察了微波功率、物料量对中和铁渣温升行为的影响,表明微波干燥湿法炼锌中和铁渣是可行的;实验考察了微波功率、物料量和干燥时间对中和铁渣脱水率的影响。研究结果表明:在一定程度上,中和铁渣脱水率与干燥时间和微波功率成正比,与物料量成反比。实验控制微波功率为1000W、物料量为50g、微波干燥时间为9min时,中和铁渣脱水率达98.55 %;X射线衍射、红外光谱分析展示微波干燥中和铁渣自由水脱除较为完全,但仍含有部分的结晶水;扫描电镜分析显示微波干燥较常规干燥更为均匀;与常规干燥工艺相比,微波干燥具有干燥时间短、水脱除率高、干燥均匀、清洁无污染等优势。 相似文献