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1.
物料特性对微波干燥影响的研究   总被引:1,自引:0,他引:1  
本文分析阐述了微波干燥原理、物料特性,通过实验及理论研究,分析了物料特性对微波干燥食品的影响;得出物料的初始含水率、物料形状、比热容与盐含量等对微波干燥影响有一定的相关性。  相似文献   

2.
本文研制了一种湿物料干燥特性的自动测试系统,该系统在原有化工原料实验装置基础上改进,配置电子天平,实时采样经RS232C串口输入计算机。软件包由C语言进行模块化编程,界面美观,操作方便,实现了湿物料干燥特性测试的自动化。  相似文献   

3.
建立了冷冻升华干燥过程中物料干燥层有效导热系数和有效质扩散系数的数学模型 ,并应用实验测得的脱水量计算出干燥层的有效导热系数和有效质扩散系数 .据此数据计算出的干燥过程中物料内部的温度分布与实验测试结果基本吻合  相似文献   

4.
物料内部湿热扩散过程是干燥设备和干燥技术研究的基础。干燥过程中,物料内部的湿、热扩散是同时发生的,本文综合湿热扩散过程,提出了切片胡萝卜内部传热模型和内部传质模型,运用第三边界条件进行了传热过程的模拟,并作了实验验证。结果表明:模拟值和实测值十分接近,最大相对偏差小于1.8%;因此用该模型模拟胡萝卜片干燥中传热过程是可行的。模拟结果还显示:物料内各处温度变化不同;在整个干燥过程中,各层的温度梯度随干燥时间先变大,随后逐渐变小,到干燥后期,各层温度趋于一致。  相似文献   

5.
本文分析了气流干燥中物料粘壁、袋式除尘器堵塞等原因,提出了克服上述问题的措施。  相似文献   

6.
设计了一种用于薯芋皂甙水解物提取的溶剂型真空过滤干燥装置,该装置能极大地改善工作环境,提高溶剂油的使用效率简化工艺流程。而且,它不仅适用于薯芋皂素的过滤干燥,还适用于颗粒较细的物料有效成分的过滤和干燥。  相似文献   

7.
为了探索一种婴儿营养玉米粉的加工方法,对其辊筒干燥工艺参数进行了研究。研究表明本产品的最佳干燥参数为:物料浓度40%~45%,辊筒转速4 r/min,干燥温度130~135℃,产品湿含量5.0%~6.0%。产品通过成片性、复水性和冲调性等指标的检测,表明应用辊筒干燥技术生产婴儿营养玉米粉是可行的。  相似文献   

8.
通过实验对LHGZ-2型热风流化床对谷物干燥的工艺的研究,实验使用绿豆、黄豆、豇豆、小麦作为实验原料,浸泡六小时称取湿重,并用封口袋密封样品,考察了干燥室温度为80℃的条件下,物料的干燥速率曲.实验数据中绿豆、豇豆、小麦曲线R2的值均大于0.97.曲线的复相关系数R值均与1较为接近,说明数据与曲线的复合度较高.计算得知绿豆、黄豆、豇豆、小麦的平均干燥速率分别为0.010、0.039、0.078、0.081.根据计算结果比较干燥速率为:小麦〉豇豆〉黄豆〉绿豆.并通过分析对装置进行了改进.  相似文献   

9.
叶丝气流干燥技术在我国烟草加工行业已得到较为广泛的运用,在叶丝干燥过程中,介质的温湿度对干燥后叶丝的感官质量有着明显的影响。在SH93叶丝高速膨胀机对叶丝进行的干燥过程中,调整松散蒸汽施加量,可以对介质的温湿度进行调节。在物料含水率、温度不变的条件下,通过改变松散蒸汽施加量,对不同部位、不同配方档次的云南烟叶叶丝干燥后感官质量的变化规律进行分析研究。结果表明,松散蒸汽施加量对云南烟叶叶丝感官质量具有较大的影响,选择合适的松散蒸汽施加量,有利于改善卷烟产品的感官质量。  相似文献   

10.
利用六西格玛工具,通过对本钢矩形坯白点的成因分析,提出了采用控制入炉物料的干燥、对白点敏感性钢种采取RH真空处理、加强坯材保温等措施,可有效控制白点的产生。得出如果钢水〔H〕含量控制在5ppm以下可以基本保障钢材不出现白点缺陷。  相似文献   

11.
Spin flash dryer has the advantages of both fluidized bed dryer and pneumatic dryer. It has predominance in dealing with thermal sensitive materials. In this paper, the distribution of the air velocity in the spin flash dryer is discussed,which indicates that the rotating air in the dryer chamber can be divided into two areas,potential flow area and plane swirl area. Experiments show that air tangent velocity effects the process of granulation most remarkably. The radial distribution and moisture content of the particles have their intrinsic rules along either the diameter or height of the drying chamber. Besides, the operating parameters of predrying on bleaching powder are optimized. To meet the strict standard of the wet-pressing granulator on the moisture content of the feeder,a narrow lap is made at proper height in the wall of the drying chamber,where a chute and a rotating valve are installed in order to predry the filter cake and remove a part of water. Then the material is fed into the wet-pressing granulator.  相似文献   

12.
热泵干燥机与燃油干燥机的性能对比研究   总被引:1,自引:0,他引:1  
本文从空气处理技术、干燥速率、干燥成本及能耗四个方面对燃油干燥机和热泵干燥机的性能进行对比分析,研究结果表明热泵干燥机的干燥速率较慢,但干燥的成本和能耗较低。因此完善热泵干燥技术具有广泛的发展前景。  相似文献   

13.
为了改善传统烘干机烘手时间长、易交叉感染、可靠性低等问题,进行了消毒干手机的设计.该设计利用红外技术检测信号,将光信号转换成电信号送入EM78P419N单片机处理,相继启动消毒和烘干模块.整个过程完全自动控制,避免交叉感染,手伸即喷,手离即停.产品具有成本低、体积小、可靠性高、干手时间短等优点,在各类人员聚集或流动的场所具有推广价值.  相似文献   

14.
Wall deposition occurs in spray dryers when dried or partially dried particles contact and adhere to the walls during operation, thus reducing the yield of product collected. Wall deposits also present a product contamination risk and a fire or explosion risk when spray drying products that oxidize exothermically, such as milk powder. Re-entrainment is the resuspension of spray dryer wall deposits into the main gas stream for collection as product. Literature suggests that the process for re-entrainment of particles from spray dryer wall deposits is strongly dependent on particle size and gas velocity.  相似文献   

15.
Wall deposition occurs in spray dryers when dried or partially dried particles contact and adhere to the walls during operation, thus reducing the yield of product collected. Wall deposits also present a product contamination risk and a fire or explosion risk when spray drying products that oxidize exothermically, such as milk powder. Re-entrainment is the resuspension of spray dryer wall deposits into the main gas stream for collection as product. Literature suggests that the process for re-entrainment of particles from spray dryer wall deposits is strongly dependent on particle size and gas velocity.  相似文献   

16.
The emission and contact drying kinetics of the paper mill sludge (PMS) were studied through experiments carried out in a paddle dryer. To get a better understanding of its drying mechanism, a penetration model developed by Tsotsas and Schlünder (1986) was used to simulate the drying kinetics of the PMS. The result indicated that this kinetics could be divided into three phases: pasty, lumpy and granular phases, and could be successfully simulated by the penetration model as the related sludge parameters were integrated into the model. The emission rate curves of the volatile compounds (VCs) were interrelated to the drying rate curve of the PMS, especially for volatile fatty acids (VFAs) and ammonia in this study.  相似文献   

17.
计算机在线测控沸腾干燥实验装置的开发研究   总被引:1,自引:0,他引:1  
该文介绍了综合型、研究型的沸腾干燥实验装置的设计理念及开发思路,并将其应用于实验教学,教学效果显著提高.在开发研制中,将固体流化技术、数据在线测控技术与过程实时监控技术与装置相结合,开拓了实验装置向自动化、信息化和多功能方向发展的新领域.  相似文献   

18.
把微处理器和温度传感器 DS18B20、湿度传感器 SHT10有机结合,移植实时操作系统μC/OS-II将多任务并行运行,采用PWM技术并利用PID控制算法实现温度、湿度的高效控制,设计实现了金银花烘干自动化控制系统。该系统具有结构简单与使用方便等优点,后期研究可以将其扩展为多种药材植物以及农产品的烘干工艺控制系统,有利于节能系统的推广和应用,以及满足社会发展的需求。  相似文献   

19.
INTRODUCTION Abbott (1990) reported that wall deposition inspray dryers may pose a potential fire risk and com-promise hygiene requirements, and reduce productquality and yield. Spray dryer hazards include igni-tion of explosible dust clouds, dust deposits, bulkpowder deposits and flammable vapour. Kieviet(1997) noted that wall deposition affected the resi-dence time distribution of particles, and particularlythat an important factor in determining residencetimes with high wall deposition…  相似文献   

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