Proceedings of the 2016 International Conference on Artificial Intelligence: Technologies and Applications

Effects of Swirl Number of the Nozzle of the Pulverized Coal Gasifier on Flow Field and Combustion Characteristics

Authors
Xuedong Liu, Baixian Li, Wenming Liu
Corresponding Author
Xuedong Liu
Available Online January 2016.
DOI
https://doi.org/10.2991/icaita-16.2016.84How to use a DOI?
Keywords
gasifier; swirl number; combustion characteristics; flow field; numerical simulation
Abstract
The numerical simulation of multiphase combustion flow field in a pulverized coal gasifier with one single nozzle is conducted by using the method of two dimensional asymmetric swirl model. Based on the eddy-dissipation-concept model, the calculation process includes volume reaction and surface reaction which can simulate the turbulent combustion with multiple mechanisms. By changing the swirl number of the nozzle, a series of parallel simulations are conducted to collect the information on shape and distribution characteristics of reversed flow and flame. The results show that: the flow field inside this gasifier is mainly composed of a central recirculation zone and an external recirculation zone; a lager swirl number can lead to a sharp decline on axial velocity, which means for the one hand it can enhance the particle residence time, but for the other hand it cause a formation of the "no reaction area" filled with coal on the top of gasifier; when the swirl number is under 1.4, the flame showed in an awl shape and the temperature of entire gasifier is too high to gasify; when the swirl number is over 1.6, the high- temperature area exists near the top of gasifier and the flame shows in a flat petal shape which is easy to turn the flame back to the nozzle; by using the Gauss curve to fit the scatter points, we can obtain a perfect swirl number 1.4.
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Volume Title
Proceedings of the 2016 International Conference on Artificial Intelligence: Technologies and Applications
Series
Advances in Intelligent Systems Research
Publication Date
January 2016
ISBN
978-94-6252-162-9
ISSN
1951-6851
DOI
https://doi.org/10.2991/icaita-16.2016.84How to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

TY  - CONF
AU  - Xuedong Liu
AU  - Baixian Li
AU  - Wenming Liu
PY  - 2016/01
DA  - 2016/01
TI  - Effects of Swirl Number of the Nozzle of the Pulverized Coal Gasifier on Flow Field and Combustion Characteristics
BT  - Proceedings of the 2016 International Conference on Artificial Intelligence: Technologies and Applications
PB  - Atlantis Press
SP  - 341
EP  - 344
SN  - 1951-6851
UR  - https://doi.org/10.2991/icaita-16.2016.84
DO  - https://doi.org/10.2991/icaita-16.2016.84
ID  - Liu2016/01
ER  -