Open AccessNumerical Simulation of Oxy-Fuel Combustion of Predrying Lignite
Author(s) -
Guanyu Wang,
Xianchun Li,
Yongjian Zeng,
Fanrui Meng,
Huanran Wang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/721/1/012043
Subject(s) - pulverized coal fired boiler , combustion , oxy fuel , combustor , flue gas , ignition system , coal , autoignition temperature , waste management , coal combustion products , adiabatic flame temperature , flue gas emissions from fossil fuel combustion , environmental science , materials science , chemistry , engineering , organic chemistry , aerospace engineering
In this paper, the combustion characteristics of lignite with different levels of predrying and the influence of different oxy-fuel concentration on the combustion characteristics of pulverized coal are studied with CFD software. The results show that with the increase of lignite moisture content, the temperature level in the burner decreases gradually, which affects the ignition of pulverized coal and the thermal efficiency of the furnace, and the amount of NO and intermediate products in the furnace also decreases. The flame distance of pulverized coal in oxy-fuel combustion is shortened and the combustion rate is accelerated. The ignition temperature and the production of NO and SO 2 are reduced, and the concentration of CO 2 can reach more than 90%. The local high temperature will appear in oxy-fuel combustion, and it will increase as the oxygen concentration increases, and the temperature of surrounding flue gas will become more uniform.