Experimental study on stable combustion performance of a novel blast furnace gas burner

To solve the problems of low calorific value gas such as blast furnace gas, such as difficult ignition, unstable combustion and low flame temperature, a novel 4.5 MW blast furnace gas burner was proposed in this study. The burner integrates the technologies of swirl combustion, blunt body combustion, regenerative combustion, rich-lean combustion and cross injection. The burner prototype was scaled down to a 15 kW burner model. Cold and hot tests were conducted to investigate the effects of nozzle structure and operation load on the flow and combustion characteristics of the burner. The results demonstrate that the burner has good stable combustion performance for low-calorific value gas, with a minimum calorific value of 3893.1 kJ<middle dot>m-3. The radial wind design enhances gas mixing and axial velocity, leading to stronger jet strength and longer flame length. Compared with conventional designs, the air cross-flow nozzle achieves higher peak temperatures (1420 degrees C), faster fuel and oxygen consumption, higher burnout rates, and combustion efficiency up to 99.99%. The burner also shows excellent load adaptability, with stable core temperatures and combustion efficiency that is consistently above 99.3%.