共查询到18条相似文献,搜索用时 187 毫秒
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中浓纸浆在升流式反应器中的运动特性与反应器的反应效率、反应器前后设备的设计和选型关系重大。通过实验对中浓纤维悬浮液启动段以及在反应器内低速运动段的流动特性进行研究分析,可为反应器前和反应器后各种设备的设计、选型提供较精确的基础数据。 相似文献
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介绍了升流式厌氧污床工作原理,对升流式厌氧污泥床反应器的启动和应用中的影响因素作了探讨,从而得出升流式氧污泥反应器设计的基本要求。 相似文献
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介绍了升流式厌氧污床工作原理,对升流式厌氧污泥床反应器的启动和应用中的影响因素作了探讨,从而得出升流式氧污泥反应器设计的基本要求。 相似文献
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采用高压气送及数据采集的方法系统地研究了中浓纸浆悬浮液在圆管内寒流流动的流体动力学特征,计算了中浓纸浆悬浮液流动的相关流体动力学参数,分析了纸浆的流动特性与纸浆密度及外界作用力的内在关系,以及中浓纸浆悬浮液达到稳定塞流时的流动形态.还研究探讨了中浓纸浆悬浮液塞流流动的多孔介质现象.在工程上可为中浓纸浆与漂剂混合后寒流段各相间的物理作用提供一定的流体动力学依据,进而使各类漂剂最大程度地在纸浆中进行扩散和均匀分布. 相似文献
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In industrial applications electroporation-assisted extraction processes are about to replace conventional extraction. The devices for PEF treatment are designed specifically to the needs of each application. However, the design process of the electrode system and field geometry inside a PEF treatment reactor consists in general of similar steps to scale from laboratory-scale experiments done in batches up to a large-scale device operating continuously. Thereby, the electrode system might be tailored specifically to an application. In contrast to a closed PEF treatment reactor for batch processing with homogeneous electric field distribution an open electrode system with inlet and outlet section involves additional losses due to inhomogeneities of the electric field geometry. The article describes a novel approach to scale up an electrode design and to define for it an optimum operating voltage with respect to high energy efficiency in a straight-forward design process based on scaling laws. Moreover, a new method is presented to derive an efficiency factor for any given electrode geometry. It is based on a comparison of the specific power required for operating the electrode system under investigation inside a PEF treatment reactor to the specific power for a cubical PEF treatment chamber with homogeneous field distribution. Examples are given based on the design of a PEF treatment reactor for crushed grapes.Industrial relevancePEF treatment devices for electroporation-assisted extraction are becoming increasingly interesting for industrial applications due to the benefits they offer with respect to product quality and energy savings. Challenges when transferring pulse parameters as obtained from laboratory scale experiments to industrial scale devices arise from electric field inhomogeneities in PEF treatment reactors designed for continuous flow. This work therefore presents a novel method to evaluate the electric field distribution inside the PEF treatment reactor with respect to energy efficiency. The derived scaling laws enable an energy-efficient up-scaling of any given electrode profile towards large scale for products such as sugar beets, potatoes, apples or crushed grapes in a straight-forward design process. 相似文献
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近10年来,国内浆厂碱回收随着企业产业结构的优化调整已向大、中型化发展,碱炉运行的经济性和可靠性是纸厂自备热电站选择蒸汽参数的主要出发点,文中针对国内大、中型木浆、草浆黑液碱炉在选择合适的蒸汽参数方面提供了一些比较与建议. 相似文献
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针对国内一些化学木浆项目在设备选型和工艺设计中的不足,扼要介绍了现代化学木浆工厂各单元设计细节方面的新特点或趋势,重点是洗浆能力的设计原则和漂白第一段的新做法。 相似文献
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纸浆流动过程可视化与MATLAB的结合 总被引:1,自引:0,他引:1
计算流体力学(CFD)是可视化的重要应用领域,本文以纸浆悬浮液流动过程可视化的研究内容和研究模型为出发点,讨论了矢量场显示技术,并且结合MATLAB程序设计语言的设计优势,从中可以看出纸浆流体的可视化是一个非常重要而又极富挑战性的研究领域。 相似文献
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相似理论在中浓纸浆泵设计中的应用 总被引:1,自引:0,他引:1
本文从现代机械设计理论与方法-相似设计理论与设计方法出发,根据本人从事泵的理论研究与实践,论述了相似理论在MCP型中浓纸浆泵设计过程中的具体应用. 相似文献