Study on the Nitric Compounds during Coal Gasification

This investigation involved the formation and evolution of NO, HCN and NH₃ during coal gasification. Since HCN and NH₃ are the precursors of NO_X, their summation are considered to show the characteristics of the precursors in this paper. The experiments were carried out in TGA with 25°C/min at atmospheric pressure. The releasing characteristics of the coal gasification species were inspected by the FTIR online instruments. The influence of coal particle size and gasification agents on the releasing characteristics of N-containing compounds was discussed. Results showed that small particle size was beneficial to form more HCN and NH₃ during coal gasification in CO₂, but not to NO; the higher concentration of CO₂ could improve the shift reaction and consume NH₃ and HCN faster; high temperature could increase the consecutive reaction velocity fast and make the consumed amount of NO exceeding the formation amount.