Results of combustion testing on three kinds of coal

which was carried out in a laboratory FBC reactor to determinethe influence of coal components and main operation perameters on the N

2

O and NO formation

show that the hishest N

2

Oemission （30

2

00

礚

/L） is noted at 923K

1

273K. The main influence paraters of N

2

O formation are combustion tem-perature. kinds of coal and oxygen excess. Temperature reduction leads to increasing N

2

O formation

but to reducing NOformation; bituminous coal yields more N

2

O than lean coal. Air-coal ratio influences on N

2

O formation

perticutarly N

2

Oformation is reduced when combustion proceeds with a air-coal ratio near to a stoichiometric value. Particle size of coal ex-erts an influence on N

2

O formation to some

extent at lower combustion temperature

but a little at higher temperature.