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A numerical model was established to investigate the lateral mass transfer aswell as the mechanism of bed-inventory overturn inside a pant-leg circulatingfluidized bed (CFB), which are of great importance to maintain safe andefficient operation of the CFB. Results show that the special flow structure inwhich the solid particle volume fraction along the central line of the pant-legCFB is relative high enlarges the lateral mass transfer rate and make it morepossible for bed inventory overturn. Although the lateral pressure differencegenerated from lateral mass transfer inhibits continuing lateral mass transfer,providing the pant-leg CFB with self-balancing ability to some extent, theprimary flow rate change due to the outlet pressure change often disable theself-balancing ability by continually enhancing the flow rate difference. Asthe flow rate of the primary air fan is more sensitive to its outlet pressure,it is easier to lead to bed inventory overturn. While when the solid particleis easier to change its flow patter to follow the surrounding air flow,theself-balancing ability is more active.

Bed-inventory Overturn Mechanism for Pant-leg Circulating Fluidized Bed Boilers