Ozone denitration technology

Ozone oxidation denitrification mainly utilizes the strong oxidizing property of ozone, oxidizes insoluble low-valent nitrogen oxides into soluble high-valent nitrogen oxides, and then absorbs nitrogen oxides in the washing tower to achieve the purpose of removal. . The denitration system can simultaneously remove high-efficiency NOx, sulfur dioxide and particulate matter in the flue gas at different concentrations and ratios of NOx and other pollutants, and does not affect other pollutant control technologies. It is a traditional denitration technology. Efficient addition or replacement technology.

Ozone oxidative denitration can be applied to: utility boilers with coal, coke and lignite as fuel; industrial boilers with gas, coal and heavy oil as fuel; lead, iron ore, zinc/copper, glass, cement processing and production Kiln and so on.

Principle of ozone denitrification

O3's complex oxidation reaction process of NOx is actually reflected by the valence state change of N. The main reactions are as follows:

2NO+3O3=N2O5+3O2

2N02+O3=N2O5+O2

NO+O3=NO2+O2

Compared with other chemicals in the gas phase such as CO, SOx, etc., NOx can be quickly oxidized by ozone, which makes ozone oxidation of NOx highly selective. Since NOx in the gas phase is converted into an ionic compound dissolved in an aqueous solution, the oxidation reaction is more complete, so that NOx is irreversibly removed without secondary pollution.

After the oxidation reaction, the added ozone is consumed by the reaction, and excess ozone can be decomposed in the spray tower. In addition to NOx, some heavy metals, such as mercury and other heavy metal contaminants, are also oxidized by ozone. High concentrations of dust or solid particles in the flue gas do not affect the efficiency of NOx removal.

Ozone oxidation denitration process diagram