隧道式中药材干燥机

通过对我国中药材干燥现状及主要问题的分析，阐述了一种能应用于广大农村地区的隧道式中药材干燥机。着重讨论了电加热器、隧道和物料小车的设计问题，确定了合理的结构参数。性能试验表明，该机适用于各类中药材的干燥作业。     

气提式双锥干燥机的开发

介绍了双锥回转真空干燥机的一种改良型机种——气提式双锥干燥机。这种干燥机不但具有原机的优点，并且有效地解决了原机在干燥中易结块成团和大型化困难等问题     

干燥机的最新发展(二)

本文论述了以过热水蒸汽作为干燥介质代替热风的干燥新技术的原理、优越性、存在的问题以及发展前景，并对微波对流干燥器的原理、特点等作了描述。     

基于模糊控制的纸机蒸汽冷凝水控制系统

针对造纸干燥部的工况多变、选用传统控制方式不易控制的情况,设计了一种基于模糊PID算法设计的S7-300控制系统,介绍了理论上和实际组态、编程的实现方法。该系统鲁棒性强,可适应复杂工况,实际应用结果表明该系统算法合理、易实现,控制效果好。     

Emissions from sawdust in packed moving bed dryers and subsequent pellet production

This study quantifies emissions of hydrocarbon terpenes from the drying of sawdust in packed moving bed dryers, through the production chain to the finished pellets, and determines the parameters suitable for emission control. The terpene content in softwood sawdust and pellets was analyzed using gas chromatography. The distribution of VOC emissions over the bed was measured with a flame ionization detector. After drying, 30–40% of the initial terpenes remain in the wood, 20–30% remain after grinding, and 10–15% remain after pelleting. Dryer emissions correlate with residence time and final sawdust moisture content. Pellet press emissions correlate with pellet moisture content.     

低温热泵干燥装置的技术方案分析

低温热泵干燥装置在化学品、食品、药品、农副产品的干燥中具有广泛需要。给出了基本型、真空型和吸附剂型三类低温热泵干燥装置,对其结构、工作原理和特性进行了简要分析。分析表明,在初投资方面,基本型最低,真空型最高;在能源效率方面,真空型最高,基本型最低;吸附剂型在初投资和能源效率方面均居中。上述工作可为低温热泵干燥装置的设计提供较好的参考。     

塔形连续式真空干燥设备节能方向的分析

以塔形连续真空干燥设备为研究对象,从传热、设备结构、配套装置和能源利用的角度分析节能减排的方向与途经。     

A mathematical model for simulating heat and moisture transfer within porous cotton fabric drying inside the domestic air-vented drum dryer

A mathematical model was developed to describe the processes of coupled heat and mass and momentum transfer occurring in convective drying of 100% porous cotton fabric. In this model, the variation in both air and fabric properties were expressed as a function of temperature and moisture content. The resulting systems of transient non-linear partial differential equations in the space-time domain together with the set of initial values and boundary conditions were numerically solved by utilizing the finite difference method. A series of laboratory drying experiments were performed using a computer-controlled dehydration system, which was developed to obtain data of drying kinetics under varying operating conditions for the validation of the predicted results from the proposed model. The experimental results has shown a very good agreement with the predictions of the model, which indicates that the proposed numerical model can be used with confidence as a tool in optimizing the design and operation of the fabric drying system. A parametric study was performed using the modeling tool has demonstrated the impact of key operational parameters on the drying kinetics, which has significant meaning on improving fabric’s appearance smoothness and decreasing the damage. It is expected that the model can be applied for other fiber products and processes involving similar phenomena.     

基于二次携带现象的带钩波形板干燥器的计算分析

带钩波形板干燥器内的二次携带现象对其分离性能有重要影响.对波形板内二次液滴的来源进行了分析,采用Fluent计算软件,计算了带钩波形板干燥器的分离效率,并将理论计算结果与实验数据进行比较.结果表明,存在二次携带情况时,双钩波形板分离效率最优.     

悬浮烘干机的流体阻力计算

悬浮烘干机是一种用于烘干粉状及小颗粒物料的新型烘干设备。在进行该烘干系统的设计时,过去由于没有计算公式而只能靠经验估计流体阻力,因此往往带来了很大的不便。在本文中,作者提出了一个悬浮烘干机阻力系数的计算公式ξ=(1-28(ab/DH))~2+2.266 经实验验证,该公式可以用来指导实际设计和生产。