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1.
循环式谷物烘干机的设计研究 总被引：2，自引：0，他引：2
本文论述了5HG-3型循环式谷物烘干机烘干工艺、工作原理及主要结构，分析计算了干燥仓内物料、热量和干燥介质消耗量的内在关系，试验研究了处理量、初始水份对烘后物料品质的影响。 相似文献
2.
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
3.
为解决常规控制图在叶丝干燥出口含水率监控中大量虚发警报,造成控制图监控失效的问题,采用时间序列模型对叶丝干燥出口数据进行拟合分析,使用残差控制图对含水率进行监控,降低了控制图的误警报率,提高了控制图在出口含水率控制中的应用效果. 相似文献
4.
HANUS M.J. LANGRISH T.A.G. 《浙江大学学报(A卷英文版)》2007,8(11):1762-1774
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
5.
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
6.
利用GZ—1型热风干燥试验设备对低浓度糖盐混合溶液渗后胡萝卜丝进行单因子试验,得出不同风温、风速下的薄层脱水方程. 相似文献
7.
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
8.
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
徐涛 《广东轻工职业技术学院学报》2008,7(3):25-28
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
9.
Vladimir N. KHMELEV Andrey V. SHALUNOV Roman V. BARSUKOV Denis S. ABRAMENKO Andrey N. LEBEDEV 《浙江大学学报(A卷英文版)》2011,12(4):247-254
The aim of this investigation was to define the effectiveness of non-contact drying using ultrasonic vibrations. Disk radiators
were used for carrying out experiments, and a special drying chamber was designed to provide resonant amplification of ultrasonic
vibrations (from 130 to 150 dB). Drying of ginseng and other vegetables demonstrated that the application of ultrasonic vibrations
reduced power inputs by 20% in comparison with convective drying. It also led to a decrease of 6% in final moisture content,
if the duration of drying was constant. The level of intensification of ultrasonic drying was high (up to 50 g for 1 kg of
drying material), which helped to lower the temperature of the drying agent and improve the quality of the dried products. 相似文献
10.
Indoor environment separated with down.feed air curtain was numerically simulated and experimentally researched.Indoor airflow and temperature fields separated with air curtain were numerically simulated.Resuits show that both polluted airflow and thermal air current can be separated with a down.feed air curtain to prevent contaminants from spreading in the room space.In a test chamber.the smoke of burning Tibetan incense served as the source of contaminants.and the probe test shows that 1.0 pm is the prevailing diameter of the smoke particles.During the release of the smoke.the particle concentration of the indoor air was tested with a laser particle counter at the points of three different heights from the floor when the air curtain was running or not.Experimental results show that the higher the test point is located,the lower the particle concentration is,implying that the separating or isolating eflfect decreases as the air velocity of the curtain reduces along with the height descends.According to both simulation and experimental results.down.feed air curtain can separate indoor environment effectively when the supply air velocity of air curtain is not less than 3 m/s.In order to strengthen separation effect,it is suggested that the supply air velocity be speeded up to 5 m/s. 相似文献
11.
Indoor air quality and thermal comfort are important features of indoor environment, In this paper, a numerical simulation based on the k-ε model of CFD is used to analyze factors such as loading, exterior-protected construction, blowing-in rate that play an important role in the temperature field and airflow field of the displacement ventilation system. Exterior-protected construction has little influence on indoor temperature distribution of displacement ventilation systems and the influence is limited only in a small area near the external wall when the indoor heat source is the main cooling load. The height of a room has little influence on indoor temperature field, and the temperature gradient of active region is basically unchanged. In the system combined with a displacement ventilation system and a cooling system, the height also has little influence. When the cooling load is high,the indoor heat source creates a strong convective plume, which will make the average indoor air age lower, the ventilation efficiency higher and the elimination of pollutant easier. Air supply rate plays an important role in displacement ventilation systems. The increase of air supply rate that can be realized by increasing the air supply velocity and enlarging the area of air inlet will increase the mass capability of the system and diminish the vertical temperature gradient. From the comparison between simulations and experiments, it is concluded that this simulation are creditable. 相似文献
12.
《天津大学学报(英文版)》2017,(6)
In this study, a continuous and airtight twinspiral dryer was developed in accordance with the characteristics and challenges in the process of disposing polysilicon slurry. Computational fluid dynamics(CFD)simulations were used to investigate the flow field in the rotating twin-spiral continuous dryer and an original discrete phase model was also elaborated to compare with the cold-modeling experimental results. The corresponding flow field was obtained using the available inlet velocity of 0.05-0.3 m/s and the rotational speed of the inner cone of 12-44 r/min, the residence time distribution, and tracked particles trajectory. Results showed that the residence time of the tracer particles in the cone cylinder was about 15.8-25.4% of the time spent out of it, and the particle's residence time was much shorter in contrast to the rotational speed and inlet velocity. The external ribbon had a larger influence on the fluid, thereby leading to a larger velocity in the region outside the cone compared to that in the region inside the cone. In addition, the appearance of the vortex and boundary layer separation at the back of the ribbon and the spoke bar had secondary diversion effects on the fluid. Furthermore, the inlet velocity had little influence on the flow field while the rotational speed of the cone greatly affected the flow field. Hence, the CFD simulations showed good agreement with the experimental results. 相似文献
13.
模拟了一种常规快速式燃气热水器的燃烧系统,研究了不同压力状况下的燃烧工况.得到的数值模拟结果与实验获得的数据吻合得较好,证明了所用物理模型和数学模型的合理性.结果显示,火焰高度和过剩空气系数依赖于系统出口和入口的静压差,而与燃烧室内的绝对压力无关.该静压差和系统中用于燃烧的空气量显著影响CO的生成,与CO的生成量呈反比关系,并同时影响燃烧区域内的温度场和速度场.为降低CO排放水平,必须增加进入燃烧系统的空气量,因此需要增加风机输出功率以提供足够的空气压头.该研究为设计快速式燃气热水器提供了一种行之有效的方法. 相似文献
14.
为了研究高大空间建筑喷口送风系统的吹风感分布,在大空间实验室中进行了夏季工况的实验测试,得到了喷口高度为4m时人体活动区域温度场、速度场和吹风感的分布.然后,采用计算流体力学的方法对实验工况进行模拟计算.将室内垂直温度和冷吹风感分布的计算结果和实测数据进行对比验证,结果显示吻合良好.在此基础上进行了不同喷口高度处工况的模拟计算,通过分析3个工况下人体活动区域的吹风感和温度,获得了较理想的送风工况.模拟结果显示,喷口高度为5m时吹风感分布较为理想,温度场和速度场较为均匀. 相似文献
15.
种子是生命力的载体 ,其传热传质的研究已经从宏观迈向微观 ,从整体迈向细胞、原生质、细胞器、分子膜的水平 .用透射电镜对未干与干燥的白菜种子进行了子叶切片观察 ,发现干燥后的种子子叶细胞仅在细胞壁有皱褶 ,细胞器无明显变化 .种子发芽过程中酶活性检测表明 ,与未干种子相比 ,萌发 48h,经 45℃干燥 2 h的种子α-酶的相对活性下降了 5 .8% ;经 67℃干燥 2 h的种子α-酶的相对活性下降了 3 0 .1% .可见 ,干燥参数影响种子的微观结构与酶的活性 ,与种子干燥的临界安全温度相同 ,酶的活性是干燥温度、初含水率与加热时间的函数 相似文献
16.
17.
Wen-yi Deng Xiao-dong Li Jian-hua Yan Fei Wang Sheng-yong Lu Yong Chi Ke-fa Cen 《浙江大学学报(A卷英文版)》2009,10(11):1670-1677
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
18.
针对青豆开展流化床干燥实验,对青豆干燥曲线进行分析,并对影响干燥的因素诸如空气温度、流速等因素进行分析比较,从中寻找青豆干燥的最佳条件。 相似文献
19.
湿式烟气脱硫系统中,由于烟气脱硫后含湿量增加,露点温度升高,大量水蒸汽凝结为小水滴吸收烟气中的二氧化硫,产生大量白雾排放到大气中,对烟囱及周围建筑中的钢结构造成腐蚀。可以通过降低吸收塔入口处吸收液的温度,使其脱硫效率增加,同时使含湿量和露点温度降低,从而有效地防治白雾生成和烟囱腐蚀。 相似文献
20.
回转烘干机广泛应用于建材工业、化学工业及矿物烘干,分析了影响回转烘干机技术性能的两类因素,一类为由转筒烘干机本身引起的因素,另一类为烘干工艺方面的因素.同时提出技术改造措施. 相似文献