Low NO_x combustion retrofit on a low volatile coal tangentially fired boiler

In order to solve the problems of low volatile coal that usually shows poor ignition performance and higher NO_x emission,traditional low NO_x combustion technology may lead to worse ignition condition for the pulverized coal.A low volatile coal tangentially fired 330 MW utility boiler was retrofitted by adopting ignition enhancement and low NO_x burner technology.Compared with the results before the retrofit,the NO_x emission is decreased from 550-600 mg/Nm~3( 6% O_2) to 350-400 mg/Nm~3.The consumption of liquid ammonia is reduced from 150-200 kg/h to 100-150 kg/h.And the NO_x emission at the stack is decreased from 70 to 35 mg/Nm~3 after modification.