共查询到19条相似文献,搜索用时 93 毫秒
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《粮油加工(电子版)》2014,(1)
本文依据螺旋输送机设计原理,提出了"基础选型"、"当量功率"和"空载功率"等概念,建立了螺旋输送机"基础选型图"、"当量功率图"和"空载功率图",利用这些图可以直观、快捷地选择满足工程要求的螺旋输送机规格型号与相应的功率。 相似文献
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《粮油加工(电子版)》2014,(1)
本文依据螺旋输送机设计原理,提出了"基础选型"、"当量功率"和"空载功率"等概念,建立了螺旋输送机"基础选型图"、"当量功率图"和"空载功率图",利用这些图可以直观、快捷地选择满足工程要求的螺旋输送机规格型号与相应的功率。 相似文献
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基于埋刮板输送机设计原理,提出“空车功率”、“当量功率”概念,并建立了埋刮板输送机“空车功率”图、“当量功率”图,利用这两张图可以直观、快捷地确定埋刮板输送机规格型号与相应的驱动功率,满足工程设计的实际需求。 相似文献
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螺旋输送机能有效输送非连续相离散物料。由于非连续相离散物料在螺旋输送机内的运动特性极其复杂,因此—直没有很好的设计计算模型。它的设计计算必须凭借设计者的经验,用类似的输送机类比。分散元模拟技术(DEM)能很好地预测到物料特性的变化(如颗粒形状、颗粒尺寸、颗粒与颗粒和颗粒与壁面之间的摩擦)对螺旋输送机性能状态的影响,以及不同结构尺寸的螺旋输送机产生的输送效果。并能使设计者直观、动态地观察到物料在运输设备内的运动状态。 相似文献
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A methodology was developed for determining destruction of bacterial spores during extrusion cooking in a single screw extruder. Procedures were developed for estimating processing time at different screw speeds and calculation of “D-” and “z-values.” The proposed methodology evaluated destruction of Bacillus globigii spores in 18% moisture corn/ soybean mixture (70/30%, w/w). “D-value” expressed on the basis of average time at mass temperature >95°C during extrusion was the most conservative estimate of spore sensitivity. Times ranged from 1.7 sec at 115°C to 6.6 sec at 100°C maximum mass temperatures. These “D-values” resulted in a “z-value” of 25.3°C., similar to that reported for the same strain with dry heat. 相似文献
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通过一次闲置的螺旋输送机改造过程,叙述了螺旋输送机改造中需要注意的几个相关事项,并对螺旋输送机现场改造中涉及到的问题提出了相应的解决办法。 相似文献
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Ozone application in a modified screw conveyor to treat grain for insect pests, fungal contaminants, and mycotoxins 总被引:1,自引:0,他引:1
Marissa X. McDonough Linda J. Mason Adrian Denvir 《Journal of Stored Products Research》2011,47(3):249-254
Recent efforts have focused on improving the application of ozone technology as a pest management tool for stored grain. This study evaluated the efficacy of a modified screw conveyor to treat grain with ozone in a continuous-flow system. The ozone concentration delivered into the screw conveyor was 47,800 ppm and the average retention time for a corn kernel moving through the system was 1.8 min. Under these conditions, 100% mortality of adult red flour beetle (Tribolium castaneum (Herbst)) and adult maize weevil (Sitophilus zeamais (Motsch.)) was achieved after three passes through the screw conveyor, which equated to a concentration × time (CT) product value of 258,120 ppm-min. The potential effectiveness of the continuous treatment to reduce mold on the surface of corn kernels was also explored. Aspergillus flavus counts were reduced by 96% in a single pass through the screw conveyor. Three passes through the screw conveyor reduced the mold count by more than 2-log units. Ozone treatment also reduced aflatoxin applied to the grain; however, the reduction was not sufficient enough to be of commercial value. The results of this study provide valuable information for estimating the parameters needed for effectively treating grain in a commercial scale continuous-flow treatment system. 相似文献