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Which Burners Can be Classified According to the Principle of Low Nitrogen Combustion Transformation?
1) Stage burner:
The staged burner designed according to the principle of staged combustion can make the fuel and air mix and burn in stages. Because the combustion deviates from the theoretical equivalence ratio, the generation of nitrogen can be reduced.

2) Self-recirculation burner:
One is to use the pressure head of combustion air to suck back part of the combustion flue gas, enter the burner, and mix it with air for combustion. Due to flue gas recirculation, the heat capacity of combustion flue gas is large, the combustion temperature is reduced, and NOx is reduced, that is, flue gas external circulation. The other type of self-recirculation burner is to recycle some flue gas directly into the burner and adds it to the combustion process. This type of burner has the dual effects of inhibiting nitrogen oxide and saving energy, that is, flue gas internal circulation.

3) Concentrated and diluted burner:
The principle is to make part of the fuel burn too rich and the other part burn too lean, but the air volume remains unchanged on the whole. Since both parts burn at a deviation from the chemical equivalent ratio, NOx is very low. This combustion is also called deviation combustion or non-chemical equivalent combustion.

4) Split flame burner:
Its principle is to divide a flame into several small flames. Because of the large heat dissipation area of the small flame and the low flame temperature, the “thermal reaction NO” is reduced. In addition, the small flame shortens the residence time of oxygen, nitrogen, and other gases in the flame, and has an obvious inhibition effect on “thermal reaction NO” and “fuel NO”.

5) Mixing promoting burner:
The residence time of flue gas in the high-temperature zone is one of the main factors affecting the production of NOx. Improving the mixing of combustion and air can reduce the thickness of the flame surface. Under the condition of constant combustion load, the residence time of flue gas in the flame surface, i.e. in the high-temperature zone, is shortened, thus reducing the production of NOx. The mixing-promoting burner is designed according to this principle.