The combustion method of the burner of the hot blast stove?

The gas fuel combustion of the hot blast stove burner is controlled by the physical process, which is also controlled by the mixing process of gas and air. According to the mixing situation of the two gases, it is usually divided into long flame combustion form, flameless combustion form and short flame combustion form. To complete the combustion of a certain amount of gas, the combustion space required for long flame combustion is large, and the space required for short flame combustion is small.

 

This means that under the same adiabatic conditions, the short flame combustion temperature will be higher. Define the amount of air required for complete combustion of a certain amount of gas as the theoretical air volume. The actual air volume is always greater than the theoretical air volume, and the ratio is the excess air coefficient. In the three combustion processes, the excess air coefficient of premixed combustion must be small for the burner of the hot water heater, while the excess air coefficient of the diffusion combustion must be large for the burner of the hot water heater. If the excess air is heated to the combustion temperature, it will consume heat, which will inevitably lead to an overall decrease in the combustion temperature. Therefore, the combustion temperature of premixed combustion is higher than that of diffusion combustion.

 

It can be seen that the combustion method of the hot blast stove is the closer to the premixed combustion, the better. This is also the reason why it is difficult to achieve high air temperature in sleeve burners, rectangular burners, swirling multi-nozzle stratified mixing burners, etc.