FUEL-NITROGEN EVOLUTION DURING FLUIDIZED BED OXY-COAL COMBUSTION
FTIR, thermo-gravimetric analysis techniques and molecular modelling were employed to study the effect of CO2 on fuel-nitrogen evolution under oxy-combustion conditions. The main objective is to compare NOx emissions at several molar fractions of O2 using Ar or CO2 as balance gas in a fluidized bed reactor. A char with about 16％ N content was prepared by pyrolysis of polyacrylonitrile. This sample facilitated NOx evolution experiments due to the abundance of nitrogen complexes, and aided the identification and quantification of several N species by means of FTIR. Results indicate that the presence of CO2 enhances NO2 formation. A complementary study was carried out by molecular modelling of the experimental reactions using the Gaussian 03 package. Different heterogeneous and homogeneous interactions between CO2 and char N-species were simulated. The results thus obtained show that the presence of CO2 during combustion can facilitate NCO formation which is a very reactive intermediate species that can be readily oxidized in the gaseous phase.
CCS ozy-coal combustion NOz evolution Fuel-N DFT modelling
Astrid Sanchez Fanor Mondragon Eric G.Eddings
Dept.of Chemistry, University of Antioquia, Medellín, Colombia Dept.of Chemical Engineering, University of Utah, Salt Lake City, Utah, USA
国际会议
第20届国际流化床燃烧会议(20th International Conference on Fluidized Bed Combustion)
西安
英文
1136-1140
2009-05-18（万方平台首次上网日期，不代表论文的发表时间）