Flow properties of solids in an inclined standpipe were investigated while the solid particle was fed to the bottom of a bubbling fluidized bed (diameter 0.1m, 1.34m tall) via the standpipe and discharged out of the bed through the overflow exit. A group of K-based CO2 adsorbent particles was used as solids. The pressure drop of the fluidized bed, the height of solids bed in the standpipe, and flow rate of gas bypassing the fluidized bed through the standpipe were measured at room temperature and pressure as varying the fluidizing gas velocity, solids flow rate, and height of the overflow exit of fluidized solids. The pressure drop of the fluidized bed, the height of the solids bed in the standpipe, and the ratio of gas bypassing through the standpipe to the total gas in flow rate decreased with increasing the fluidizing gas velocity. Both the pressure drop of the fluidized bed and the height of the solids bed in the standpipe increased a little with the solids feed rate. The effect of the solids feed rate on the flow rate of gas bypassing through the standpipe could be ignored. The pressure drop of the fluidized bed and the height of the solids bed in the standpipe increased as the height of the overflow exit for solids increased in the fluidized bed. However, the effect of the height of the overflow exit on the flow rate of gas bypassing through the standpipe was negligible. Correlations on the pressure drop of the fluidized bed, the height of the solids bed in the standpipe, and the flow rate of gas bypassing through the standpipe were proposed successfully.

Standpipe Dipleg Cyclone Bubbling Bed Fluidized Bed

Knowlton TM, in Circulating Fluidized Beds, Grace JR, Avidan AA, Knowlton TM, Eds., Blackie Academic & Professional, London, UK, 214 (1997).
Choi JH, Yi CK, Jo SH, Korean J. Chem. Eng., 28(4), 1144 (2011)
Yi CK, Jo SH, Seo Y, J. Chem. Eng. Jpn., 41(7), 691 (2008)
Sauer RA, Chan IH, Knowlton TM, AIChE Symp. Ser., 234, 1 (1984)
O’Dea DP, Rudolph V, Chong YO, Powder Technol., 62, 291 (1990)
Takeshita T, Atumi K, Uchida S, Powder Technol., 71, 65 (1992)
Karri SBR, Knowlton TM, in Circulating Fluidized Bed Technology IV, A. Avidan Ed., AIChE, New York, U.S.A., 253 (1993).
Yaslik AD, in Circulating Fluidized Bed Technology IV, A. Avidan Eds., AIChE, New York, U.S.A., 484 (1993).
Karri SBR, Knowlton TM, Litchfield J, in Fluidization VIII, Large JF, Laguerie C, Eds., Engineering Foundation, New York, U.S.A., 557 (1995).
Jing S, Hu QY, Wang JF, Jin Y, Chem. Eng. Process., 42(5), 337 (2003)
Martin L, van Ommen JR, Chem. Eng. J., 204-, 206 (2012)
Youn PS, Choi JH, Korean Chem. Eng. Res., 52(1), 81 (2014)
Kunii D, Levenspiel O, Fluidization engineering, 2nd Ed., Butterworth- Heinemann, Boston, U.S.A. (1991).
McCabe WL, Smith JC, Harriott P, Unit operations of chemical engineering, 7th Ed., McGraw-Hill, New York, U.S.A., 98 (2005).
Rowe PN, Partridge BA, in Proc. Symp. on Interaction between Fluids and Particles, Inst. Chem. Eng. London, UK, 135 (1962).
Choi JH, Son JE, Kim SD, IEC Research, 37, 2559 (1998)