NOx Reduction by Ozone Oxidation

NOx Reduction by Ozone Oxidation

Nitrogen oxides (NOx) refer to a group of reactive gases that include nitric oxide (NO) and nitrogen dioxide (NO2). These compounds are produced during combustion processes, such as those occurring in vehicles, power plants, and industrial facilities. While NOx itself is not directly harmful, its atmospheric reactions and secondary products can have several adverse effects on the environment and human health. Here are some of the harmful effects of NOx:

  1. Air Pollution:

    • NOx contributes to the formation of ground-level ozone and particulate matter, both of which are major components of smog. Ground-level ozone can irritate the respiratory system and cause respiratory problems. Particulate matter can penetrate deep into the lungs and pose health risks.
  2. Respiratory and Cardiovascular Issues:

    • Exposure to nitrogen dioxide can irritate the lungs and lower respiratory function. Individuals with respiratory conditions such as asthma may experience exacerbation of their symptoms. Long-term exposure to NOx has been linked to an increased risk of respiratory and cardiovascular diseases.
  3. Eutrophication:

    • NOx can contribute to the eutrophication of water bodies when deposited from the atmosphere. Eutrophication occurs when excess nutrients, including nitrogen compounds, enter water systems, leading to algal blooms. These blooms deplete oxygen levels, harm aquatic ecosystems, and can result in “dead zones” where marine life cannot thrive.
  4. Acid Rain Formation:

    • Nitrogen oxides can react with atmospheric moisture to form nitric acid, contributing to acid rain. Acid rain can damage soil, water bodies, vegetation, and buildings. It can also harm aquatic life by lowering the pH of lakes and rivers.
  5. Global Warming:

    • While not as potent as carbon dioxide (CO2) in terms of its greenhouse effect, nitrous oxide (N2O), a byproduct of certain NOx reactions, is a potent greenhouse gas. It contributes to global warming and climate change

 

Efforts to reduce NOx emissions typically involve the implementation of emission control technologies and ozone is a very effective one.

Applying Ozone

The characteristics of ozone application in the oxidation and denitrification industry: Ozone has a high selectivity to NOx and a fast speed, and O3 can basically complete the oxidation of NO at 0.05s. The absorption of oxidized products should be strengthened by the spray absorption process at the back end. Without heating the flue gas, N2O5 is easily absorbed by the lye, and some heavy metals such as mercury and other heavy metal pollutants are also oxidized and removed by ozone. A high concentration of dust or solid particles in flue gas will not affect NOx removal efficiency. A high concentration of dust or solid particles in flue gas will not affect NOx removal efficiency. According to the NOx concentration of flue gas, can flexible adjustment of ozone production. 

According to the complex oxidation reaction process of O3 for NOx, in fact, it is finally reflected through the change of valence state of N. The main reactions are as follows:

NO+O3=NO2+O2

2NO2+O3=N2O5+O2

2NO+3O3=N2O5+3O2

nox reduction

OZONE FLUE GAS TREATMENT BENEFITS

  • Configurable NOx reduction rates scaling from 30% to 95%-plus
  • Effective treatment of a wide range of nitrogen oxides and harmful pollutants – also in conjunction with various Air Pollution Control (APC) equipment
  • A future-proof solution capable of meeting evolving NOx regulations
  • Low CAPEX when inlet NOx is of moderate level and existing APC equipment can be used
  • Transparent costs with ozone consumption reflecting removal efficiency
  • No need to interfere with / modify existing combustion equipment or to reheat the flue gas to high temperatures
  • No need to store hazardous chemicals required for traditional abatement processes

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