Hebei Hua Rong Environmental Protection Equipment Co., Ltd. is a wholly-owned independent legal person subsidiary. Mastered the core technology of low nitrogen burner, HBUNB series gas burners are divided into 2t, 4t, 6t, 10t, 15t and other models. The technology of partial premixing, fuel classification, air classification and flue gas recirculation is adopted, and the control part adopts Siemens high safety controller. By reasonably designing the burner, optimizing the flow field in the combustion chamber, reducing the combustion temperature and ensuring the combustion stability, the purpose of reducing the emission of nitrogen oxides is achieved. After repeated CFD simulations and a large number of field tests, the R&D tests from 2t to 20t have been completed, and the emission data are all up to standard, the emission index has reached the domestic and international leading level, and the emission of nitrogen oxides is as low as 30mg/m3, which is in line with the newly promulgated Beijing boiler air pollutant emission standard 20 15. The burner adopts a special combustion controller to monitor the design safety factors such as gas pressure, duct pressure, damper position, combustion flame and boiler water level in real time to ensure combustion safety. The burner adopts three-electron modulation to accurately control the gas quantity, air quantity and recycled flue gas quantity, so as to ensure the air-fuel ratio of the burner under different loads, realize the continuous adjustment of the burner load, and ensure the stability of combustion and nitrogen oxide emission under different loads.