Effect of Coal Properties on HCN and NH₃ Release During Coal Pyrolysis

The formation of HCN and NH ₃ from fuel nitrogen during pyrolysis was studied in a prefilled reactor system with slow (temperature-programmed) heating and in a drop-in reactor system with a rapid heating rate. The experimental results indicate that the formation of HCN and NH ₃ is obviously affected by coal properties. The effects of these coal properties vary with the heating fashion. Coal rank, characteristic of char residue, surface characteristics, and composition of the coal are important factors influencing the formation of HCN and NH ₃ during pyrolysis.

Keywords:

• coal
• properties
• pyrolysis
• NO_x precursors
• HCN
• NH₃

Notes

^a Characteristic of char residue

^b Volatile matter.

^c By difference.

^d The temperature at pyrolysis conversion 5%.

^e The temperature at pyrolysis conversion 50%.