Comparison of Riser-Simplified, Riser-Only, and Full-Loop Simulations for a Circulating Fluidized Bed

Processes. 2019;7(5):306 DOI 10.3390/pr7050306

 

Journal Homepage

Journal Title: Processes

ISSN: 2227-9717 (Online)

Publisher: MDPI AG

LCC Subject Category: Technology: Chemical technology | Science: Chemistry

Country of publisher: Switzerland

Language of fulltext: English

Full-text formats available: PDF, HTML, ePUB, XML

 

AUTHORS

Min Wang (State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijng 102249, China)
Yingya Wu (State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijng 102249, China)
Xiaogang Shi (State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijng 102249, China)
Xingying Lan (State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijng 102249, China)
Chengxiu Wang (State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijng 102249, China)
Jinsen Gao (State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijng 102249, China)

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 11 weeks

 

Abstract | Full Text

With the development of computing power, the simulation of circulating fluidized bed (CFB) has developed from riser-simplified simulation to riser-only simulation, then to full-loop simulation. This paper compared these three methods based on pilot-scale CFB experiment data to find the scope of application of each method. All these simulations, using the Eulerian−Eulerian two-fluid model with the kinetic theory of granular theory, were conducted to simulate a pilot-scale CFB. The hydrodynamics, such as pressure balance, solids holdup distribution, solids velocity distribution, and instantaneous mass flow rates in the riser or CFB system, were investigated in different simulations. By comparing the results from different methods, it was found that riser-simplified simulation is not sufficient to obtain accurate hydrodynamics, especially in higher solids circulating rates. The riser-only simulation is able to make a reasonable prediction of time-averaged behaviors of gas−solids in most parts of riser but the entrance region. Further, the full-loop simulation can not only predict precise results, but also obtain comprehensive details and instantaneous information in the CFB system.