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Study on Classification Capability of Mini-cyclones for Super-fine Powders

Author: WangShangYuan
Tutor: HaoWenGe
School: Northeastern University
Course: Environmental Engineering
Keywords: Mini - cyclone Ultrafine powder Particle size classification Classification efficiency
CLC: TQ051.8
Type: Master's thesis
Year: 2007
Downloads: 70
Quote: 0
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Abstract


The ultra-fine powder material is a special feature of the material. With the development of China's high-tech and new materials industries, especially fine powder material particle size is growing, but demand in the ultra-fine powder of high purity materials 2μm below the existing grading machine sorting coarser generally only reach about 10 μm, and the existence of low yields, high energy consumption, the use of poor reliability, low separation efficiency shortcomings. Mini-cyclone can achieve grading of ultrafine powders, the classification performance of the mini-cyclone classifier for a problem in the classification field, research, the purpose is to use the mini-cyclone classifier about 1μm ultrafine powders separated from the fine powder. Not only reached the purpose of the dust, and useful component in the dust recycling, resource utilization dust. First cyclone quasi-free vortex separation space to take a micro unit, and the establishment of the powder concentration of two-dimensional differential equations based on mass transfer theory. Expressions to determine the dust concentration distribution obtained through mathematical derivation cyclone classification efficiency formula. And the collection efficiency of the parameters to be written as a the Stoke number of dimensionless form. At the same time for ultra-fine powder separation design the miniature cyclone classification of three groups of different sizes, and experimental study of the different dust species under the conditions of the mini-cyclone collection and classification performance at different wind speeds. Theoretical studies and experimental test data indicate that the ultra-fine powder can be carried out via a mini cyclone classification, grading particle size up to 0.6-0.8 μm, is difficult to achieve in traditional grading equipment. The cyclone classifier has the advantages of simple structure, easy to operate, the use of mini-cyclone powder grading equipment is feasible, in theory and in practice. The test data indicate that the new theory is better than the \Miniature cyclone classification efficiency Stk relationship with the theoretical formula. The similarity criteria - Stokes number Stk classification performance of cyclone classifier, can reduce the workload of the experimental study of the cyclone classifier. Powder classifying the proposed application of the mini-cyclone, it is recommended that a suitable wind velocity of 15-20m / s. Ultrafine powder recycling, design a reasonable governance process program. The powder can achieve effective recycling, to achieve good economic returns.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical machinery and apparatus, equipment > Chemical process machinery and equipment > Material separation machinery
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