What are the current issues with ultra-low nitrogen burners?

2024/07/17

What are the current issues with ultra-low nitrogen burners?
What are the current issues with ultra-low nitrogen burners? Nowadays, the application of ultra-low nitrogen burners has become very common, and many companies have responded to the requirements of national environmental protection policies by making improvements. Therefore, everyone knows and understands about ultra-low nitrogen burners. However, today we will learn about the current problems of ultra-low nitrogen burners?
At present, ultra-low nitrogen burner technology is the most widely used, relatively simple, and economical method. Among the numerous pollutants emitted during coal combustion, NOx is the only gas pollutant whose emissions can be reduced by improving combustion methods. However, when implementing low nitrogen combustion technology, the following problems may be encountered to varying degrees. As the air volume in the second stage increases, the incomplete combustion loss will also increase accordingly. In reality, the air volume in the second stage is about 15% to 20% of the total air volume.
Ultra low nitrogen burners are recently applied to the design of burners based on the principles of air and fuel classification, aiming to reduce the oxygen concentration and temperature in the ignition zone as much as possible, in order to control the amount of NOx generated. This type of specially designed burner is called a low nitrogen burner, which can reduce nitrogen emission concentration by 30% to 50% under normal conditions.
The target audience of ultra-low nitrogen burners is wide, including boilers, smelting furnaces, furnaces, heat treatment and other fields, as well as industries related to thermal energy, where combustion systems are essential. The historical development of combustion engine technology in China is relatively short compared to industrialized regions such as Europe, with a period of five to six years. It has strong vitality, a rising market, stable production growth, and coupled with the attention of the public and the government to environmental protection, the design of combustion engines mainly tends to improve emissions and efficiency levels.
The combustion environment of ultra-low nitrogen burners with lower temperature and oxygen content will reduce the combustion efficiency of boilers. Without increasing the fineness of fuel (such as coal powder), the combustible content of fly ash will increase; Due to oxygen deficient combustion in the burner area, the CO content near the furnace wall increases, which may cause metal corrosion of the water-cooled wall tubes.
In order to lower the combustion temperature and delay the combustion process, in some cases, it may reduce the ignition stability and lead to a decrease in the low load combustion stability of the boiler. The application of most combustion adjustment measures may flatten the temperature distribution along the height of the furnace, causing varying degrees of displacement in the heat absorption of the furnace, ultimately leading to a higher flue gas temperature at the furnace outlet.
What are the current issues with ultra-low nitrogen burners? There are many problems that exist, but it is absolutely suitable for the current development needs of enterprises. A certain item must have its shortcomings, but we need to remember that no matter how many shortcomings this product has, as long as it conforms to the times and can meet the current needs of enterprises, it is perfect. Others can be ignored as much as possible. In the future, there will definitely be more outstanding combustion equipment.

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