Self-preheating burners are widely used in industrial furnaces, and their airflow control is the key to ensure combustion efficiency and safety. According to search results, there are the following common challenges in airflow control of self-preheating burners：

1. Combustion Stability

Self-preheating burners must produce a high-intensity combustion reaction in a confined space to achieve rapid flame emission. However, this high-intensity combustion can lead to instability, affecting combustion efficiency and the uniformity of temperature within the furnace.

2. Furnace Pressure Regulation

Self-preheating burners regulate furnace pressure by using an air ejector in the flue to draw in flue gas. Proper regulation of furnace pressure is essential for maintaining the stability of the combustion process and ensuring the recirculation of the airflow within the furnace. If the pressure regulation is incorrect, it can cause disordered airflow, which can negatively impact heating performance.

3.Explosion and Gas Poisoning Risks

When using self-preheating burners, it is crucial to strictly control the supply and combustion of fuel gas to prevent explosions and gas poisoning. Especially during the cleaning process before ignition and after extinguishing, it is essential to ensure that there are no residual flammable gases in the furnace to avoid safety incidents.

4.NOx Emission Control

Self-preheating burners can produce high NOx emissions under high-temperature conditions. To reduce NOx emissions, precise control of the combustion process is necessary, including the ratio of fuel gas to air and the combustion temperature. Advanced burner designs use technologies like staged combustion to lower NOx emissions, but this also complicates airflow control.

5. Airflow Recirculation

The high-speed flame from self-preheating burners promotes airflow recirculation within the furnace, improving heat transfer and temperature uniformity. However, effectively controlling airflow recirculation to prevent localized overheating or uneven heating remains a challenge.

6. Heat Exchange Efficiency

Self-preheating burners transfer the residual heat from flue gas to the combustion air or gas through a counter-flow heat exchanger. The efficiency of heat exchange directly impacts the burner's energy-saving performance and combustion efficiency. Optimizing the design and operation of the heat exchanger to enhance heat exchange efficiency is a critical aspect of airflow control.

To sum up, the gas flow control of self-preheating burner needs to comprehensively consider combustion stability, furnace pressure regulation, safety risk, NOx emission control, gas recirculation and heat exchange efficiency, so as to ensure the combustion process is efficient, stable and safe.