What is the reason for the treatment of atmospheric denitration waste gas?What are the sources of nitrogen oxides?

Release time:

2023-01-31

There are many kinds of nitrogen oxides, mainly including NO, NO2, N2O3, N2O, etc. Among them, NO and NO2 are the main atmospheric pollutants

What is the reason for the treatment of atmospheric denitration waste gas?

As we all know, nitrogen oxides are one of the main sources of air pollution. There are many kinds of nitrogen oxides, mainly including NO, NO2, N2O3, N2O, etc. Among them, NO and NO2 are the main atmospheric pollutants. However, 70% of China's nitrogen oxide emissions are caused by the direct combustion of coal. The rise of the power industry has made China a large coal-fired country, and the NOx emissions mainly come from thermal power plants.

What are the sources of nitrogen oxides?

Nitrogen oxides come from thermal power generation, motor vehicle exhaust, boilers, etc.

1. Thermal power generation is the main source of nitrogen oxides. It mainly includes flue gas emissions from coal-fired units and gas-steam combined cycle power plants. The main flue gas components of coal-fired boilers are N2, O2, SO2, nitrogen oxides (NOx), and a small amount of CO, CH4 and other hydrocarbon compounds (CH). The main flue gas components of gas-steam combined cycle power plants are N2, O2, CO, S02, nitrogen oxides, particulate matter, and so on.

Nitrogen in the air oxidizes at high temperature to form NO and NO2. NO can combine with human hemoglobin, resulting in the decrease of blood oxygen transport capacity. NO2 is a stimulating gas with strong toxicity, which has strong stimulation on respiratory organs, causing tracheitis, pneumonia, emphysema, and tissue hypoxia.

2. The important sources of nitrogen oxides also include the exhaust emissions of motor vehicles. When the automobile internal combustion engine is running, when the combustion temperature of the internal combustion engine reaches 1600 ℃, nitrogen oxides will be formed.

3. Combustion boilers are also a major source of nitrogen oxides, especially in winter, when heating is needed, the concentration of nitrogen oxides is 10 times higher than that in summer, and the oxidation performance is good in summer, which can be quickly converted. Therefore, the problem of nitrogen oxide pollution in winter is more serious.

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