微波干燥技术在蜂窝陶瓷中的应用

蜂窝陶瓷挤压成形后的强度低、难干燥等问题．严重制约了蜂窝陶瓷的广泛应用。近年来,微波干燥技术已应用于蜂窝陶瓷上,可以解决其强度低、难干燥等问题。结果表明,微波干燥技术能降低成形后蜂窝陶瓷坯体约10％的水分。通过分析蜂窝陶瓷干燥的过程,提出了热风干燥与微波干燥相组合的方法,结合两者的优势,以达到优化节能的目的。     

微波干燥在陶瓷行业的应用

对微波干燥的原理、特点及相关设备组成进行了简单介绍,着重评述了微波干燥技术在建筑陶瓷、日用陶瓷、卫生陶瓷、蜂窝陶瓷及结构功能陶瓷粉体中的应用研究,并展望了微波干燥技术在陶瓷行业的应用前景。     

活性炭蜂窝体干燥开裂的影响因素

通过实验室研究,考察了干燥方法、泥料液固质量比、泥料陈化时间及粘结剂对活性炭蜂窝体干燥开裂的影响。结果表明,微波干燥的成品率最高,微波干燥时间为16 min;粘结剂是影响蜂窝体干燥开裂的主要因素,具有层链状结构的海泡石与具有热凝胶化性能的纤维素醚是活性炭蜂窝体的最佳粘结剂;活性炭原料的饱和吸水量决定最佳液固质量比,最佳液固比为0.91;泥料陈化有利于提高干燥制品的成品率,泥料最佳陈化时间为20 h。     

陶瓷坯体干燥的新方法—微波干燥

本文对比分析了微波干燥法和传统干燥方法的干燥特性,介绍了陶瓷坯体在微波干燥室内的干燥过程与优化的微波干燥工艺参数。     

新型蜂窝陶瓷的研制

开发适用于高效换热器用的蓄热体——对新型蜂窝陶瓷的结构、原料选用、成形方法以及干燥烧结进行了系统研究，使蜂窝陶瓷的抗热震性等性能大大提高，确定了一套合理的生产蜂窝陶瓷的工艺制度，并且使其能够满足生产实际需要。     

日本研究出微波烧成陶瓷技术

日本几家科研机构正在加紧研究采用微波技术烧成陶瓷制品的方法。微波烧成陶瓷的技术可以大大缩短烧成时间与产品生产周期,并可大幅度降低能耗。这项微波烧制陶瓷技术的工作原理是,让陶瓷制品的坯体吸收2.45兆赫频率的微波后,由其自身(陶瓷坯体)散发的热量将陶瓷半成品加热烧制到所需的温度。目前,采用微波烧成的窑炉已开发成功。这种炉型的炉壁呈双层结构,由吸收微波的陶瓷与隔热材料组成。据我们深入分析,该项技术应用在隧道窑方面具有相当大的潜力,如果我国陶瓷企业能够在该方向发展,洁具的生产无论在质量还是产量方面均可以发生质的飞跃…     

微波干燥技术在陶瓷行业中的应用

本文结合陶瓷坯体的组成及形状要求,分析了利用微波干燥技术干燥陶瓷坯体的原理和特点,并阐述了微波干燥设备的选择及干燥过程中应注意的事项。     

蜂窝陶瓷蓄热体的研究现状

介绍了蜂窝陶瓷蓄热体在蓄热节能技术中的发展及应用,详细讨论了蜂窝陶瓷蓄热体的研究现状,尤其是在材质结构以及换热性能的发展及应用中存在的问题,指出了蜂窝陶瓷蓄热体在节能、环保方面的发展方向.     

微波干燥技术及其在陶瓷坯体干燥中的应用研究

阐述了微波干燥的基本原理、理论及其特点，同时分析了微波应用于陶瓷坯体干燥的几个技术问题；也对其在国内外陶瓷材料干燥中的应用进行了研究分析。     

陶瓷坯体不同干燥方式的对比研究

分别采用普通热风、远红外和微波干燥方式对陶瓷坯体的干燥过程进行实验研究,研究不同干燥方法对干燥速度、坯体内外温差的影响。结果表明,热空气干燥主要靠水分浓度差实现,内外温差较大;远红外线干燥的坯体内外温度均匀,恒速阶段的干燥速度是热风干燥恒速阶段速度的1.2倍;微波干燥主要靠温度差实现水分扩散,最大干燥速度可达4.26%/min(干基),约为热风干燥速度的12倍。将含水量为22wt%的陶瓷坯体干燥至恒重,普通电热干燥的运行成本最高,约为远红外干燥的1.5倍和微波干燥的4.2倍。分析了远红外干燥和微波干燥在陶瓷工业应用的可行性,指出了需要解决的技术难题。     

陶瓷部件挤出成型工艺

本文以蜂窝陶瓷生产工艺为例，讨论了陶瓷部件挤出成型过程中，塑性泥料的制备、成型、干燥和烧成等工艺技术和装备问题。     

Microwave-Assisted Drying of Biomaterials

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.     

Drying Characteristic of Porous Ceramic Microspheres in a Microwave Heated Fluidised Bed

This paper presents drying characteristics of both water and nitrate salt solution (simulated waste) impregnated ceramic microspheres in a pilot‐scale (10 kg), batch fluidised bed drier heated with microwave energy, under isothermal bed conditions. For comparison, some constant microwave power experiments with water saturated microspheres were also conducted. The effects of bed temperature, fluidising gas flow rates and initial moisture content on drying kinetics were examined. For a given initial moisture and gas flow rate, the total microwave energy consumption for both isothermal bed and constant power level experiments was found to be approximately the same. The decline in drying rates in the presence of nitrate salts was attributed to a decrease in the effective diffusivity resulting from changes in structural properties of salt solution impregnated powders. The use of fluidised bed coupled with microwave heating produced controlled drying of 10 kg batches of simulated waste loaded ceramic powders without any significant agglomeration or coating.     

Energetic Analysis of Drying Biological Materials with High Moisture Content by Using Microwave Energy

One of the most important parameters in the drying process is the efficiency of energy transfer. Although it is well known that the absorbed component of the referred energy in the dehydration process under microwave conditions is theoretically lower—especially during the falling rate period of drying—by an order of magnitude than that of convective drying, the real efficiency of energy transfer in the microwave field depends on numerous—partly unknown—factors. In this study, the most significant relations between the energy transfer efficiency and the drying parameters were investigated. During the experiments, two power levels were used to study the effects of domain variables in apple, potato, and onion dehydration processes. The results showed that variations in microwave power level played an important role in overall drying kinetics.

Based on the recorded data, we determined the typical energy efficiency factors for microwave drying of apple, potato, and onion. The specific energy consumption was calculated to compare the energy efficiency of a single measurement series. It was evident that by applying higher power levels, the energy utilization was more efficient. Furthermore, we theoretically proved and experimentally showed the nonthermal effects of the microwave energy.     

Drying of a Slip Casting for Tableware Product Using Microwave Continuous Belt Dryer

To demonstrate the potential of microwave drying in the ceramic industry, microwave demolding of tableware product by a continuous microwave belt drier has been investigated. This study focuses on the investigation of the effects of the irradiation time, sample size, microwave power and location of magnetron on overall drying kinetics. The results show that microwave drying has several advantages over the conventional method such as shorter processing time, volumetric dissipation of energy throughout a product, high energy efficiency, reduced amount of mold usage, and offering product quality. Further quantitative validation of experimental data could be very useful, especially in providing information for processing high-performance microwave drying for developing the ceramic industry in Thailand.     

Drying of a Slip Casting for Tableware Product Using Microwave Continuous Belt Dryer

To demonstrate the potential of microwave drying in the ceramic industry, microwave demolding of tableware product by a continuous microwave belt drier has been investigated. This study focuses on the investigation of the effects of the irradiation time, sample size, microwave power and location of magnetron on overall drying kinetics. The results show that microwave drying has several advantages over the conventional method such as shorter processing time, volumetric dissipation of energy throughout a product, high energy efficiency, reduced amount of mold usage, and offering product quality. Further quantitative validation of experimental data could be very useful, especially in providing information for processing high-performance microwave drying for developing the ceramic industry in Thailand.     

HANa-AA-AM共聚物作为陶瓷坯体增塑剂的研究

本文在不同工艺条件下合成一系列不同粘度的HANa-AA -AM三元共聚物 ,并将之应用于陶瓷坯体中 ,研究了HANa -AA -AM三元共聚物对陶瓷坯体可塑性及坯体干燥强度的影响 ,通过和其它常用增塑剂的对比研究表明 ,HANa-AA -AM三元共聚物是一种较好的陶瓷坯体增塑剂 ,而且对坯体干燥强度有一定增强效果。     

微波真空组合干燥技术的研究

微波真空干燥是综合微波干燥和真空干燥各自优点的一项新技术,将微波干燥的快速高效性和真空干燥的低温高质相结合,在真空条件下利用微波对物料进行干燥处理,从而实现物料的快速低温干燥。着重阐述了微波真空组合干燥技术的机理、特点、干燥动力学以及影响微波真空干燥的重要因素,并对微波真空组合干燥的应用研究进行了介绍。