Effect of in-Bed Heat Exchanger on Bed Inventory Imbalance in a Pantleg CFB Design – A CFD Study

Authors: Shengteng Hu^a, Wei Wang^a, Rick Wessel^a, Tom Flynn^a, Dave Kraft^a
a Babcok & Wilcox Power Generation Group, Inc., Barberton, OH 44203, USA

Source: CFB 11: 11th International Conference on Fluidized Bed Technology, 14-17 May, 2014, Beijing, China

Description: In this study, computational fluid dynamics (CFD) simulations are carried out on a large capacity, pantleg CFB boiler with a unique design that can reduce bed inventory imbalance problems. When an in-bed heat exchanger (IBHX) is placed between the two legs of the CFB, the simulations show that with a proper design, the IBHX can enhance lateral solids transfer between the two legs and compensate for the hydrodynamics-induced spontaneous inventory imbalance. The new design enhances boiler operation and at the same time, allows for flexibilities to accommodate other boiler design requirements.

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