TY - JOUR
T1 - Downer reactor
T2 - From fundamental study to industrial application
AU - Cheng, Yi
AU - Wu, Changning
AU - Zhu, Jingxu
AU - Wei, Fei
AU - Jin, Yong
N1 - Funding Information:
This paper is based on the presentation record by Prof. Yong Jin who received the 2006 Lectureship Award in Fluidization issued by the Particle Technology Forum (PTF) of AIChE and sponsored by PSRI (Particulate Solids Research Inc.). Some additional materials are provided for a better overview on this subject. Considering the review article by Zhu et al. [5] , the following content will mostly focus on the recent efforts made in developing both fundamental understanding and process development of downer reactors.
Funding Information:
The authors would like to thank the financial supports from NSFC, SINOPEC, PetroChina and PetroBras on the downer-related projects. Recent financial supports from NSFC (No. 20306012), FANED (No. 200245), and SRFDP (No. 20050003028) are greatly acknowledged. Prof. Yong Jin gives special thanks to Dr. J.R Grace, Dr. L.-S. Fan, Dr. J.X. Zhu, Dr. X.T. Bi, Dr. P. Cai and Dr. D.R. Bai for their great support in nominating Prof. Jin as the candidate for 2006 Lectureship Award in Fluidization (PSRI).
PY - 2008/4/21
Y1 - 2008/4/21
N2 - Downer reactor, in which gas and solids move downward co-currently, has unique features such as the plug-flow reactor performance and relatively uniform flow structure compared to other gas-solids fluidized bed reactors, e.g., bubbling bed, turbulent bed and riser. Downer is therefore acknowledged as a novel multiphase flow reactor with great potential in high-severity operated processes, such as the high temperature, ultra-short contact time reactions with the intermediates as the desired products. Typical process developments in industry have directed to (1) the new-generation refinery process for cracking of heavier feedstock to gasoline and light olefins (e.g., propylene) as by-products; and (2) coal pyrolysis in hydrogen plasma which opens up a direct means for producing acetylene, i.e., a new route to synthesize chemicals from a clean coal utilization process. This paper is to give a comprehensive review on the development of fundamental researches on downer reactors as well as the particular industrial demonstrations for the fluid catalytic cracking (FCC) of heavy oils and coal pyrolysis in thermal plasma.
AB - Downer reactor, in which gas and solids move downward co-currently, has unique features such as the plug-flow reactor performance and relatively uniform flow structure compared to other gas-solids fluidized bed reactors, e.g., bubbling bed, turbulent bed and riser. Downer is therefore acknowledged as a novel multiphase flow reactor with great potential in high-severity operated processes, such as the high temperature, ultra-short contact time reactions with the intermediates as the desired products. Typical process developments in industry have directed to (1) the new-generation refinery process for cracking of heavier feedstock to gasoline and light olefins (e.g., propylene) as by-products; and (2) coal pyrolysis in hydrogen plasma which opens up a direct means for producing acetylene, i.e., a new route to synthesize chemicals from a clean coal utilization process. This paper is to give a comprehensive review on the development of fundamental researches on downer reactors as well as the particular industrial demonstrations for the fluid catalytic cracking (FCC) of heavy oils and coal pyrolysis in thermal plasma.
KW - Downer reactor
KW - Fluid catalytic cracking, Coal pyrolysis
KW - Hydrodynamics
KW - Modeling and simulation
UR - http://www.scopus.com/inward/record.url?scp=41549096747&partnerID=8YFLogxK
U2 - 10.1016/j.powtec.2008.01.022
DO - 10.1016/j.powtec.2008.01.022
M3 - Article
AN - SCOPUS:41549096747
SN - 0032-5910
VL - 183
SP - 364
EP - 384
JO - Powder Technology
JF - Powder Technology
IS - 3
ER -