Effects of Swirl Number of the Nozzle of the Pulverized Coal Gasifier on Flow Field and Combustion Characteristics
Xuedong Liu, Baixian Li, Wenming Liu
Available Online January 2016.
- https://doi.org/10.2991/icaita-16.2016.84How to use a DOI?
- gasifier; swirl number; combustion characteristics; flow field; numerical simulation
- 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.
- 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 -