What is the working principle of a 30mg low nitrogen combustion engine?
What is the working principle of a 30mg low nitrogen combustion engine?
Recently, it has been discovered that many customers are consulting about 30mg low nitrogen combustion engines. On the one hand, many customers are not clear about the concept of 30mg low nitrogen combustion engines, and are not sure where the specific boundary points between ultra-low nitrogen combustion engines and low nitrogen combustion engines are. At the same time, some of the reasons are the requirements for modification according to the instructions of the higher authorities. Today, we will learn about the working principle of 30mg low nitrogen combustion engines, which can be distinguished in a timely manner.
1. Stage burner: A stage burner designed based on the principle of staged combustion, which mixes fuel and air in stages for combustion. Due to the deviation of combustion from the theoretical equivalence ratio, it can reduce the generation of nitrogen.
2. Self recirculation burner: One type is to use the pressure head of the combustion air to suck back some of the combustion flue gas, enter the burner, and mix with the air for combustion. Due to flue gas recirculation, the heat capacity of combustion flue gas is large, the combustion temperature decreases, and NOx decreases. Another type of self recirculation burner is to directly recycle some flue gas into the burner and add it to the combustion process. This type of burner has a dual effect of suppressing nitrogen oxide and saving energy.
3. Dense lean type burner: Its principle is to make some fuel undergo over rich combustion and another part undergo over lean combustion, but the overall air volume remains unchanged. Due to the deviation of both parts from the chemical equivalence ratio, NOx is very low, and this type of combustion is also known as deviation combustion or non chemical equivalence combustion.
4. Split flame type burner: Its principle is to divide a flame into several small flames. Due to the large heat dissipation area of the small flames, the flame temperature is lower, causing a decrease in the “thermal reaction NO”. In addition, a small flame shortens the residence time of gases such as oxygen and nitrogen in the flame, and has a significant inhibitory effect on both “thermal reaction NO” and “fuel NO”.
5. Mixed 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 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 generation of NOx. The mixed promotion burner is designed according to this principle.
6. Low nitrogen precombustion chamber burner: The precombustion chamber is generally composed of primary air (or secondary air) and fuel injection system, etc. The fuel and primary air mix quickly, forming a rich fuel mixture in the primary combustion zone of the precombustion chamber. Due to oxygen deficiency, only part of the fuel is burned, and the fuel precipitates volatiles in the primary flame zone with low oxygen deficiency and flame temperature, thereby reducing the generation of NOx.