Numerical analysis of the flow field inside an entrained-flow gasifier

Citation
Yc. Choi et al., Numerical analysis of the flow field inside an entrained-flow gasifier, KOR J CHEM, 18(3), 2001, pp. 376-381
Citations number
8
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemical Engineering
Journal title
KOREAN JOURNAL OF CHEMICAL ENGINEERING
ISSN journal
0256-1115 → ACNP
Volume
18
Issue
3
Year of publication
2001
Pages
376 - 381
Database
ISI
SICI code
0256-1115(200105)18:3<376:NAOTFF>2.0.ZU;2-W
Abstract
The flow field of an entrained-flow gasifier was numerically simulated to d escribe coal gasification process. The standard k-epsilon turbulence model and SIMPLE procedure were used with the primitive-Variable method during co mputation. In order to investigate the influencing factors on the flow fiel d that may have a great effect on coal gasification process, some parametri c studies were performed by changing the gas injection angle, gas inlet dia meter, gas inlet velocity, extension in burner length and gasifier geometry . The calculation results showed that the basic patterns of the flow field inside the gasifier were nearly the same with a parabolic distribution irre spective of the change in parameters. There existed an obvious external rec irculation zone with axial length less than 1.0 m and a narrow internal rec irculation region was observed in the entrance of gasifier inlet. The geome try parameters of the burner, such as the oxygen inlet diameter and angle, influenced the flow field at the inlet region near the burner. But after a certain length along the gasifier, the flow field was nearly the same as th at in the basic case.