Effects of Minerals on the Release of Nitrogen Species from Anthracite

Abstract

Experiments have been carried out to investigate the effects of minerals on nitrogen species emission including NO and its precursors from a high rank coal during temperature-programmed combustion by TG/EGA method at 10°C/min. Sodium was found to be an excellent catalyst for the reduction of NO and HCN evolution due to its higher catalysis of sodium on the char-NO reaction. However, iron can induce an increase of NO release. Calcium and titanium additives can be classified as inactive constituents because of their weak catalysis on HCN and NO emission. All the metallic additives can promote NH₃ emission except sodium. Parent coal has higher fractions of nitrogen release as NO and NH₃ and lower fraction of nitrogen release as HCN than demineralized coal, which can be attributed to the catalysis of indigenous minerals in parent coal.

Keywords:

• demineralization
• metallic additive
• nitrogen species
• TG/EGA

Notes

^a YB: Parent Yibin coal.

^b DYB: Demineralized Yibin coal.