How to control nitrogen oxides in boiler flue gas

Nitrogen oxides (nitrogen oxides) in boiler flue gas are harmful gases, which are harmful to the environment and human health. The following are some methods to control nitrogen oxides in boiler flue gas:

1. low-nitrogen combustion technology: adopting low-nitrogen combustion technology is an effective method to reduce the emission of nitrogen oxides in boiler flue gas. Low-nitrogen combustion technology can be realized by many methods, such as improving the combustion chamber structure, adopting advanced combustion control system and adopting fuel pretreatment.

2. Waste gas recovery (FGR) technology: Waste gas recovery technology is to recover a part of waste gas and mix it with combustion gas, thus slowing down the generation of nitrogen oxides in the combustion process. This method can reduce the formation of nitrogen oxides by reducing the combustion temperature during combustion.

3. Choosing the right fuel: Choosing low-nitrogen fuel is also an effective way to control the emission of nitrogen oxides from boiler flue gas. For example, the use of low-nitrogen fuels such as natural gas can effectively reduce the emission of nitrogen oxides.

4. Post-treatment technology: Post-treatment technology includes catalyst selection and selective non-catalytic reduction (SNCR) technology selection. These technologies can convert nitrogen oxides into harmless nitrogen and water during combustion.

It should be noted that the method of controlling NOx emission from boiler flue gas needs to be formulated according to the actual situation of boiler and pollutant emission standards. At the same time, these methods also need comprehensive consideration and design to achieve the best purification effect.