共查询到19条相似文献,搜索用时 109 毫秒
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本文提出一种新型的复合填料塔设备,将穿流筛板引入到填料塔中。同普通填料塔相比,复合填料塔优化了液体分布和再分布装置,节省了大量空间,压降低,穿流筛板本身又有优良的传质性能,因此具有比普通填料塔更好的性能。并对复合填料塔传质性能进行了测定和关联,得到了传质性能基础数据,可为复合填料塔的设计应用提供参考。 相似文献
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在内径为500mm有机玻璃塔中,以空气、水为物系,对金属IMPAC-1型填料的流体力学及传质性能进行了实验研究,获得了该填料的几何特性、流体力学及传质性能数据。与INTALOX DG50相比,传质性能提高近20%以上。为方便工业应用,对数据进行了关联。 相似文献
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D. Zhang J.P. Tu J.Y. Xiang Y.Q. Qiao X.H. Xia X.L. Wang C.D. Gu 《Electrochimica acta》2011,(27):9980
Well-crystallized FeS2 powders are synthesized via solid state reaction. Influence of particle size on electrochemical performances has been conducted. Compared with other anode materials, FeS2 powder with mean particle size of 0.28 μm exhibits high coulombic efficiency, initial discharge specific capacity, low polarization and enhanced electrode process kinetics. The enhanced electrochemical properties are attributed to the dense powder packing, better electrical contact and relative stable structure during cycling process. Smaller FeS2 particles (0.078 and 0.071 μm) have difficulty in dispersing and mixing with carbon black and binder and less dense packing state, leading to a decrease of reactive contact surface area and poor electrochemical performance. 相似文献
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Randomly packed bed reactors are widely used in chemical process industries, because of their low cost and ease of use compared to other packing methods. However, the pressure drops in such packed beds are usually much higher than those in other packed beds, and the overall heat transfer performances may be greatly lowered. In order to reduce the pressure drops and improve the overall heat transfer performances of packed beds, structured packed beds are considered to be promising choices. In this paper, the flow and heat transfer inside small pores of some novel structured packed beds are numerically studied, where the packed beds with ellipsoidal or non-uniform spherical particles are investigated for the first time and some new transport phenomena are obtained. Three-dimensional Navier–Stokes equations and RNG k–ε turbulence model with scalable wall function are adopted for present computations. The effects of packing form and particle shape are studied in detail and the flow and heat transfer performances in uniform and non-uniform packed beds are also compared with each other. Firstly, it is found that, with proper selection of packing form and particle shape, the pressure drops in structured packed beds can be greatly reduced and the overall heat transfer performances will be improved. The traditional correlations of flow and heat transfer extracted from randomly packings are found to overpredict the pressure drops and Nusselt number for all these structured packings, and new correlations of flow and heat transfer are obtained. Secondly, it is also revealed that, both the effects of packing form and particle shape are significant on the flow and heat transfer in structured packed beds. With the same particle shape (sphere), the overall heat transfer efficiency of simple cubic (SC) packing is the highest. With the same packing form, such as face center cubic (FCC) packing, the overall heat transfer performance of long ellipsoidal particle model is the best. Furthermore, with the same particle shape and packing form, such as body center cubic (BCC) packing with spheres, the overall heat transfer performance of uniform packing model is higher than that of non-uniform packing model. The models and results presented in this paper would be useful for the optimum design of packed bed reactors. 相似文献
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填料床层的负荷性能图及绘制 总被引:3,自引:0,他引:3
在对塔板和填料的流体力学特性进行分析的基础上,提出了填料的负荷性能图,对其流体力学限制条件进行了讨论,并选出了各限制条件的计算模型,绘制了填料的负荷性能图。 相似文献
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介绍新型鞍环填料———双鞍环填料的构型和特点。通过性能试验与对比分析,表明其基本性能和若干技术经济指标优于环矩鞍填料,可代替传统填料用于塔的节能改造以及热敏性物系分离与真空精馏等的填料塔设计。 相似文献
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本文报导了Dg50改进型陶瓷矩鞍填料的流体力学性能的测试结果,并对填料的流体力学现象等作了分析讨论。提出了一种简便可靠的计算干填料比表面积的方法。 相似文献