喷雾干燥粘壁的原因与解决途径

对喷雾干燥粘壁的类型和原因进行了分析。喷雾干燥粘壁主要有半湿物料粘壁、低熔点物料的热熔性粘壁和干粉表面粘附三种类型。半湿物料粘壁主要与喷雾干燥塔结构、雾化器结构、安装、操作以及热风在塔内的运动状态有关。物料熔点低于干燥温度时容易产生热熔性粘壁。干粉表面粘附与塔壁的几何形状、粗糙程度、空气流速、静电力等有关。提出了解决各种类型粘壁的技术措施。     

隧道式热风循环电热干燥炉及其应用

本文介绍了一种干燥效率高、节能降耗、温差小、干燥产品质量高的隧道式热风循环电热干燥炉.该炉采用多点分区控温,各均温区为一个热风循环组元,实现炉内双侧纵横双向热风循环,热风循环组元根据干燥传热学按干燥第一阶段、第二阶段在干燥炉长度方向间距不同布置.可根据产品规格和工艺需要,实现严格的温度曲线,同时也便于调整.热风循环装置应用于隧道式干燥炉,能强化对流换热,均匀炉温,提高干燥质量.推广应用结果表明:本炉型非常适合于规模化生产高质量树脂磨具,比箱式炉可节能约40%.     

轻质碳酸钙生产节能探讨

本文从轻质碳酸钙厂的碳化、脱水、烘干过程，如何挖掘节能潜力，提高经济效益，列出较详细的各种不同工艺参数，并绘制出不同工艺参数与能耗关系曲线图，进行耗能与经济效益对比分析。     

气干型不饱和聚酯树脂

气干型不饱和聚酯树脂是常温交联的热固性树脂。其性能优良，光泽度高，丰满度好，是优良的饰面材料。它的组成的原子灰，是理想的更新换代产品，广泛适合于金属基材的嵌填。     

磷酸氢钙气流干燥方法的优化

论述了改进单级气流干燥器以干燥磷酸氢钙的新方法，解决了易粘结物料不便干燥的问题。     

Dehulling of canola by hydrothermal treatments

Hydrothermal pretreatments for loosening the hull of Westar canola (Brassica napus L.) to promote dehulling of the seeds were investigated. The samples tested had on average 14.5% hull on a mass basis. Conditioning treatments involved soaking the seeds in distilled water or exposing the seeds to saturated steam. The moistened seed was treated with one of the following drying methods: unheated-air drying, infrared drying, and fluidized-bed drying. The dried grain was milled in an abrasive dehuller to break the hulls loose. The hulls were removed from the mix by aspiration. The treated seeds yielded a minimum of 11.4% to a maximum of 14.9% of the seed mass as the hull fraction. Nontreated seeds yielded 9.4% of the seed mass in hull fraction after abrasive dehulling and aspiration. Among treatments, raising the moisture content of the whole seed from 6 to 15% by exposure to steam, followed by drying in a fluidized bed, resulted in the maximum percent dehulling efficiency. The hull fraction contained about 24% crude fiber, 18% oil, and 18% protein on a dry-mass basis.     

Process conditions affect pigment quality and yield in extracts of purple sunflower hulls

Extract of purple sunflower hulls is a potential red food colorant; however, suitable process conditions must still be identified. Selected process variables were studied using bench-scale units to prepare, clarify, concentrate and spray dry extracts. Concentration by evaporation at 32°C and addition of maltodextrin to 15% (wt/dry wt) prior to drying largely eliminated pigment degradation during those steps. Relative to water extracts, extracts prepared with 5 to 15% ethanol in water generally yielded more pigment with similar levels of degradation and loss during subsequent processing. Use of 5% ethanol/2% citric acid reduced yield by about half relative to water, but gave a powder with a lower degradation index and wetting time. Percentage recovery of pigment during concentration and drying was not greatly affected by solvent type or extraction temperature.     

陶瓷刀具在干切削加工中的应用

文章论述了陶瓷刀具的特点和切削性能,对陶瓷刀具在干切削中的使用进行了分析.     

SBS新成型剂在硬质合金上的应用

介绍了SBS新成型剂在硬质合金螺旋混合传统工艺和喷雾干燥现代工艺中的应用情况。结果表明,SBS新成型剂具有粘度低、操作方便,在氢气中容易脱除等特点,既适合于螺旋混合传统工艺,也适用于喷雾干燥现代工艺．     

不同强度等级混凝土等温干燥脱水规律

通过电热恒温鼓风干燥箱在60,80,105,120,150℃下分别对C20,C30,C40,C50这4个强度等级的混凝土进行干燥,分析其干燥速率、完全干燥所需时间和失水量等的变化规律.结果表明:在相同干燥温度下,混凝土强度等级越高,干燥速率越小,完全干燥所需时间越长,总失水量越少;相同强度等级混凝土在干燥时,干燥温度越高,干燥速率越大,完全干燥所需时间越短,总失水量越多;当干燥温度高于80℃时,混凝土中的结晶水开始失去,且干燥温度越高,结晶水失去越多;基于修正Page模型Ⅱ,考虑干燥温度和混凝土强度等级的影响,得到了适用于C20～C50混凝土在60～150℃下的干燥模型.