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

TL;DR

This study uses a numerical model to analyze the bed-inventory overturn mechanism in pant-leg circulating fluidized bed boilers, highlighting how flow structure and pressure differences influence stability and overturn risk.

Contribution

It introduces a detailed numerical investigation of the bed-inventory overturn mechanism, emphasizing the roles of flow structure and pressure differences in stability.

Findings

High solid particle volume fraction increases lateral mass transfer.

Outlet pressure changes can disable self-balancing, leading to overturn.

Flow rate sensitivity affects the likelihood of bed-inventory overturn.

Abstract

A numerical model was established to investigate the lateral mass transfer as well as the mechanism of bed-inventory overturn inside a pant-leg circulating fluidized bed (CFB), which are of great importance to maintain safe and efficient operation of the CFB. Results show that the special flow structure in which the solid particle volume fraction along the central line of the pant-leg CFB is relative high enlarges the lateral mass transfer rate and make it more possible for bed inventory overturn. Although the lateral pressure difference generated from lateral mass transfer inhibits continuing lateral mass transfer, providing the pant-leg CFB with self-balancing ability to some extent, the primary flow rate change due to the outlet pressure change often disable the self-balancing ability by continually enhancing the flow rate difference. As the 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 particle is easier to change its flow patter to follow the surrounding air flow,the self-balancing ability is more active.