Numerical Investigation on the Characteristic of Low NO_x Combustion in a 600MW Tangential Boiler

The influx,combustion and NO_x emission were studied on the different distribution of over fire air by numerical simulation.Numerical results show that the NO_x emission can be controlled below 400 mg/m~3(6%O_2),the combustion system of LNCFS can inhibit the NO_x emission better.Deep air staging can control the final NO_x emission by inhibiting the volatile NO_x in the primary combustion zone,but the char NO_x was controlled by the deep air staging worse.With the burn out of remaining pulverized coal,the increasing of NO_x emission is the main reason on influencing the final NO_x emission.