The so-calledOzone De-NOx TechnologyThe principle involves oxidizing nitrogen oxides with low solubility in water to soluble nitrogen oxides with high valence using the oxidizing properties of ozone. Subsequently, in a spray washing tower, absorption is achieved through alkaline solutions to remove the contaminants.
The low-temperature flue gas denitration technology, utilizing the low-temperature catalytic oxidation method, is the simplest and most effective. Since nitrogen oxides in flue gas are primarily composed of NO (accounting for 95%), and NO is poorly soluble in water, when NO comes into contact with ozone, a reaction occurs, resulting in the formation of NO2, NO3, N2O5, and other high-valent nitrogen oxides. These high-valent nitrogen oxides are water-soluble, forming HNO2 and HNO3, significantly enhancing their solubility. They can be easily removed from flue gas by methods such as spraying with alkaline solutions (e.g., Ca(OH)2, NaOH).
Converting NO in flue gas to a high valence state requires the introduction of a strong oxidizing agent. Among various oxidizing agents, ozone is the most environmentally friendly and clean option. With a relatively long lifespan, O3 is generated by ionizing a small amount of oxygen or air and then injected into the flue gas, significantly reducing energy consumption.
Among the reactions included are as follows:
NO+O3→NO2+O2 （1）
NO2+O3→NO3+O2 （2）
NO2+NO2→N2O4 （3）
N2O4+O3→N2O5 （4）
NO3+NO2→N2O5 （5）
3NO2+H2O→2HNO3+NO (6)
N2O5+ H2O→2HNO3 （7）
Ozone denitrification utilizes ozone to oxidize NO to high-valent nitrogen oxides, which then require further absorption. Common absorption liquids include Ca(OH)2, NaOH, and other alkaline solutions. The denitrification efficiency of NO can reach 86.27% to 92%.
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