Flow Pattern and Flow Rate of Solids in the L-Valve of CFB System.

Abstract

The flow pattern of solids in a downcomer of an L-valve was classified mainly into four patterns: packed-bed pattern, coexistence pattern, oscillation pattern and pseudobridge pattern. The solid flow rate and the static pressure distribution were closely related to these flow patterns. Based on the experiments using the small-scale two-dimensional L-valve model, flow pattern maps were presented. Furthermore, simple realationships between the solid flow rate and the gas flow rate in the L-valve were derived.