What is the principle of industrial burners

1. Stage burner: A stage burner designed according to the principle of graded combustion allows fuel and air to be mixed and burned in stages. Since the combustion violates the theoretical equivalence ratio, the generation of NOx can be reduced.

2. Self-recirculation burner: One type uses the pressure head of combustion-supporting air to suck back part of the combustion flue gas, enter the burner, and mix it with air for combustion. Due to the recirculation of flue gas, the heat capacity of the combustion flue gas is large, the combustion temperature is reduced, and NOx is reduced. Another type of self-recirculation burner is to recirculate part of the flue gas directly in the burner and add it to the combustion process. This type of burner has the dual functions of suppressing nitrogen oxides and saving energy.

3. Rich-lean burner: Its principle is to make part of the fuel burn in an over-rich manner and the other part of the fuel burn in an over-lean manner, but the overall air volume remains unchanged. Since both parts are burning in violation of the chemical equivalence ratio, NOx is very low. This type of combustion is also called violation combustion or non-chemical equivalent combustion.

4. Cutting flame burner: Its principle is to divide a flame into several small flames. Since the small flame has a large heat dissipation area and a low flame temperature, the "thermal reaction NO" is reduced. In addition, the small flame shortens the residence time of gases such as oxygen and nitrogen in the flame, which has a significant inhibitory effect on "thermal reaction NO" and "fuel NO".
5. Mixing promotion burner: The residence time of flue gas in the high temperature zone is one of the main factors affecting the generation of NOx. Improving the mixing of combustion and air can reduce the thickness of the flame surface. Under the condition of unchanged combustion load, the residence time of flue gas in the flame surface, i.e. the high temperature zone, is shortened, thereby reducing the generation of NOx. The mixing promotion burner is designed according to this principle.

6. Low NOx precombustion chamber burner: The precombustion chamber is a high-efficiency, low-NOx staged combustion technology developed and researched in my country in the past 10 years. The precombustion chamber is generally composed of primary air (or secondary air) and a fuel injection system. The fuel and primary air are quickly mixed to form a fuel-rich mixture in the primary combustion zone of the precombustion chamber. Due to lack of oxygen, only part of the fuel is burned, and the fuel evaporates in the primary flame zone with poor oxygen and lower flame temperature, thereby reducing the generation of NOx.