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Fluidizing Behaviors of Ultra-fine Powders in a Spouted Bed with a Draft Tube

Author: MaLan
Tutor: ZhouYong
School: Sichuan University
Course: Chemical Engineering
Keywords: Ultrafine powder The guide tube spouted bed Fluidization behavior Proposed fluid model Soil mechanics
CLC: TQ021
Type: Master's thesis
Year: 2002
Downloads: 81
Quote: 1
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Abstract


Ultrafine powder fluidisation by traditional methods is difficult to achieve due to the strong adhesion , smooth fluidization, Therefore, in the past when fluidizing usually not using such particles . But in recent years , with the development of the technology of the ultra-fine powder and superfine powder processing needs , the technology research and application of ultra-fine powder fluidization increasingly attention , in particular, how to improve the quality of fluidization research is becoming focus and hot spots. In this study, the average particle size the 5μm of CaCO of 3 ultrafine powder materials , guide tube spouted bed fluidization behavior of ultra-fine powder systematic experimental study investigated the bed structure and operating conditions on the starting spouted behavior , solid circulation rate , gas-solid two-phase flow characteristics of the gas distribution, and dual-zone bed of solid particles in the flow in the annulus area . The results showed that: in a certain structure and operating conditions of the bed , the ultra - fine powder can be achieved in the guide tube spouted bed stationary fluidization, and thereby provides a new and effective method for improving superfine powder fluidization quality ; solid circulation rate spouting gas flow guide tube diameter , the guide tube to the bottom of the nozzle outlet spacing and bed loading is proportional to the amount ; gas is basically non-existent \characteristics. On the basis of the experimental observations , the study also with soil mechanics analysis and one-dimensional two-fluid model derivation and the establishment of a dual-zone two - phase model different from the large - particle system , theoretically discussed the various factors on the two-phase flow characteristics the impact . By the model without dimensional analysis found without affecting the solid circulation rate due to the number of groups by regression fit of the experimental data , quantitative correlations solid circulation rate , which is in good agreement with the experimental results , the error is ± 29%. In this study, in order to improve the quality of ultrafine powder flow provides a new way of thinking , the research provides a good foundation for further Sichuan University master's degree thesis carried out on basic research and the development of ultra-fine powder guide tube spouted bed reactor .

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