Intensification of the combustion process
In engineering, in order to meet the needs of the process or improve the heating efficiency, it is often necessary to
strengthen the basic combustion process to obtain a higher heating temperature, reduce the furnace space and
heating time.
The enhanced combustion process should be mainly considered from two aspects: increasing temperature and
enhancing air flow mixing.
Preheat gas and air
Preheating the gas and air can increase the flame propagation speed, thereby increasing the combustion temperature
and combustion intensity. The waste heat of flue gas is often used to preheat the air, which can not only strengthen
the combustion, but also improve the thermal efficiency of the combustion equipment.
Part of the high-temperature flue gas generated by combustion can also be redirected back to the gas-air inlet to mix
it with the gas-air that has not yet ignited or is burning to increase the temperature of the reaction zone and thereby
increase the combustion intensity. An appropriate proportion of recirculated flue gas can not only strengthen
combustion, but also effectively reduce the generation of harmful gas components (such as nitrogen oxides) in the
exhaust smoke.
Enhance airflow turbulence
The chemical reaction speed of gas combustion is much greater than the mutual diffusion and mixing speed between
gas molecules and oxygen molecules. Therefore, the main factor restricting the increase in combustion speed is the
mixing process between gas and air. If the intensity of the gas-air mixing can be increased, the combustion speed will
be greatly increased.
The most widely used method in engineering is to apply rotating airflow to improve the mixing intensity of airflow.