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

DOI

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.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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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  - 10.2991/icaita-16.2016.84
ID  - Liu2016/01
ER  -