Numerical Simulation of a Low NOx Pulverized-Coal Burner in Same Velocity of Two Channels with 180º Spiral Separated Plate

The velocity differences are 4.4~6.7 m/s of a horizontal biased pulverized-coal concentration burner with 180deg spiral separated plate, and it brings about many problems of operation safety, combustion stability and NOx emission, etc., so it is proposed of a low NOx pulverized-coal burner in same velocity of two channels with 180deg spiral separated plate. Velocity differences are less than 0.69 m/s of the low NOx pulverized-coal burner in same velocityof two channels with 180deg spiral separated plate, and its optimized structure parameters are upwind angle 30deg, backwind angle 60deg, and blocked cone area rate 15%. Pulverized-coal concentration of its dense jet channel increases 15~18%, meanwhile its dilute jet channel´s decreases about 15%, the low NOx pulverized-coal burner in same velocity of two channels with 180deg spiral separated plate has more advantages than conventional biased pulverized-coal concentration burner in efficient combustion and low NOx emission etc..