In this paper

the residence time distribution of jet - entrained gasifier is measured in a large scale cold model (1000 mm × 4000 mm) gasifier based on the twin - fluid concentric intersective jet nozzle. Post by - pass mixing model for the residence time distribution in gasifier is constructed based on the network synthesis technique and the explicit mathematic equation of that has been obtained. The relationship of the model parameter with dimensionless similarity number Ct and the momentum ratio of annular jet flow to concentric jet flow Gr is also given in the experiment conditions.