EXPERIMENTAL AND NUMERICAL STUDY ON GAS FLOW IN THE GRID ZONE OF JETTING-FLUIDIZED BEDS
作者:
JICHENG BI,
TOSHINORI KOJIMA,
期刊:
Chemical Engineering Communications
(Taylor Available online 1996)
卷期:
Volume 147,
issue 1
页码: 55-73
ISSN:0098-6445
年代: 1996
DOI:10.1080/00986449608936495
出版商: Taylor & Francis Group
关键词: Jetting fluidized bed with conical distributor;Grid gas flow;Gas exchange between jet and annulus;Temperature effect;Numerical simulation
数据来源: Taylor
摘要:
A grid model describing the gas flow and interchange in the grid zone of jetting fluidized beds is proposed. Based on this model, longitudinal gas concentration profiles in the jet and annulus are calculated. The longitudinal gas concentration distribution is also experimentally investigated in a jetting fluidized bed with an inside diameter of 50 mm at the ambient temperature, and a jetting fluidized bed with an inside diameter of 80 mm at high temperatures. Comparison between the calculated and experimental results has shown that the experimental profiles can be qualitatively predicted by the grid model. The results indicated that the concentration in the grid zone depends on the gas exchange between the jet and the annulus, and the net gas flow from the jet to the annulus. The gas exchange rate is mainly affected by the inlet gas velocity from the nozzle. The present study is thought to be helpful to understand the grid gas behavior in the jetting fluidized bed coal gasifier.
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