Velocity field of cold model gasifier with top-setting seven-nozzle
PENG Baozai
LIU Zhen
GUAN Qingliang
FANG Xinhui
LI Wenhua
Abstract：In order to investigate the flow field of the top-setting seven-nozzle gasifier,a model gasifier was designed based on the similarity principle with the height of 4 000 mm and the diameter 800 mm based on industrial dry-coal fed gasifiers.The velocity fields were measured using PDA for the top-setting seven-nozzle scheme and top-setting single-nozzle scheme,respectively.The results indicate that the top-setting single-nozzle scheme has a center-jet flow field,but the top-setting seven-nozzle scheme is of a plug-flow like field with much less axial velocity degradation along the radial direction.In addition,the center velocity of the top seven-nozzle scheme reduces more dramatically than that of the top-setting single-nozzle scheme resulting in fewer short-way particles.The top-setting seven-nozzle scheme has much smaller reflux zone and better gas-solid mixing effects that the top-setting single-nozzle scheme.The calculated reflux ratio of particles near the nozzle exit positions of the top-setting seven-nozzle scheme is higher than that of the top-setting single-nozzle scheme,which indicates that the top-setting seven-nozzle scheme can effectively enhance the gas-solid mixing and improve the carbon conversion efficiency.
Keywords：gasifitioncold modeltop-setting seven-nozzlevelocity fieldreflux ratio
Publication Date：2017-01-01