Natural gas has the characteristics of high heat value

high efficiency

low cost and low emission when used as fuel. However

when natural gas is burned

the local high temperature region can easily appear

and NOx is generated. Therefore

the optimized design of natural gas burner has a very important role for cleanly and effectively use of natural gas. The structure of the existing new type of slit burner with low NOx is optimized. There are two ways to improve the structure:the oblique air holes are opened on natural gas pipeline

the diversion baffles are added next to the small slit. The software Fluent is used for numerical simulation

and the experiment on the optimized burner is carried out. The simulation results are well verified by the data measured in the experiment. The results on the optimized structure are obtained as following:round holes are oblique opened on the natural gas pipeline

compared with the original burner

the temperature distribution is more uniform and NOx emission is reduced. Round opening at the same direction with slit is better. When round holes are opened the same direction with slit in the natural gas pipeline

the average concentration of NOx in the flue gas outlet dropped a lot

and the average concentration of NOx decreases gradually with the increase of the opening angle. The effect of diversion baffles added on the right side of slits is not as good as the original structure. When the diversion baffles are added on the left side of the slits

the average NOx emissions in the flue gas outlet is reduced

and the NOx emissions decreases first and then increases with the increase of the angle of the flap. Holes at the same direction with slit angle of 50° on natural gas pipeline are the best choice in all cases.