Abstract
By using a high-speed video camera and particle image velocimetry (PIV) technique, the local flow properties of the solid-gas two phases flow were studied in a plexiglass rectangular CFB cold model with the a riser of 1.5×0.864×4.9m3. Measurements were carried out with transparent spherical glass bead between 0.1–0.425mm as bed materials and cold air as flow medium. The experimental results showed that the secondary air has an important influence on the particle velocity distribution. Because of the secondary air penetrating effect, the particle lateral movement was acute. In the dilute region, the outlet and the comer effect induced the defluxion of the particles movement and the core-annular distribution was broken. The closer to the outlet, the stronger the lateral velocity is. The obstruct of hanging screen reduced the furnace outlet effects between the hanging screen and the front wall, where the particle movement in the area was controlled by the gas flow and the constrain of the wall. High particle concentration areas were formed in the junction between the screen and the front wall and in the comer between the left wall and the front wall.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Huang S H., Lu J D., Qian S Z. et al. A study on the cold-state flow characteristics of a rectangular flat wall circulating fluidized bed [J]. Journal of Engineering for Thermal Energy & Power, 1995 10(3): 144–148.
Harris A T., Davidson J F., Thorpe R B. Particle residence time distributions in circulating fluidized beds[J]. Chemical Engineering Science, 2003, 58 (11): 2181–2202.
Harris A T, Davidson J F, Thorpe R B., The influence of the riser exit on the particle residence time distribution in a circulating fluidized bed riser [J]. Chemical Engineering Science, 2003, 58(16): 3669–3680.
Liu H E., Yang Y H., Wei F., Jin Y. et al Solids Mixing Behavior in Riser with Internals[J]. Chemical Reaction Engineering and Technology, 2002,18(2): 109–114.
Qian S Z., Lu J D., Huang S H. et al. Effects of geometric structure of circulating fluidized bed walls on gas-solid flow characteristics[J]. Journal of Chemical Industry and Engineering, 1996, 47(6): 706–711 (in Chinese).
Wang C P, Li D K, Lu Z A, et al. Analyses of Wall and Corner Effects in Square-cross section Circulating Suspension Beds[J]. Chemical Reaction Engineering and Technology, 2003,19(1): 57–62.
Zhou J., Grace JR., Qin S. et al. Voidage profiles in a circulating fluidized bed of square cross-section [J]. Chemical Engineering Science, 1994, 49 (19): 3217–3226.
Zhou J., Grace JR., Lim C J. et al. Particle velocity profiles in a circulating fluidized bed riser of square cross-section[J]. Chemical Engineering Science, 1995, 50(2): 237–244.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2009 Tsinghua University Press, Beijing and Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Tian, C. et al. (2009). Effect of Riser Geometry Structure on Local Flow Pattern in a Rectangular Circulating Fluidized Bed. In: Yue, G., Zhang, H., Zhao, C., Luo, Z. (eds) Proceedings of the 20th International Conference on Fluidized Bed Combustion. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02682-9_70
Download citation
DOI: https://doi.org/10.1007/978-3-642-02682-9_70
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-02681-2
Online ISBN: 978-3-642-02682-9
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)