What Is Nitrogen Oxide?

Nitrogen oxides, including various compounds, such as nitrous oxide (N ₂ O), nitric oxide (NO), nitrogen dioxide (NO ₂ ), nitrous oxide (N ₂ O ₃ ), dinitrogen tetroxide ( N ₂ O ₄ ) and dinitrogen pentoxide (N ₂ O ₅ ). Except for nitrogen dioxide, other nitrogen oxides are extremely unstable. When exposed to light, humidity or heat, they become nitrogen dioxide and nitric oxide, and nitrogen oxide becomes nitrogen dioxide. Therefore, in the occupational environment, several gas mixtures are often called smoke (gas), mainly nitric oxide and nitrogen dioxide, and nitrogen dioxide is the main. Nitrogen oxides all have varying degrees of toxicity.

Inhaled mainly through the respiratory tract.

Introduction to Toxicology

Nitrous oxide

Acute poisoning: There may be no obvious symptoms or eye and upper respiratory tract irritation symptoms when inhaling gas, such as pharynx, dry cough, etc. Delayed after 6 to 7 hours of incubation

Nitric oxide (NO) is a colorless gas,

1 For the extraction sampling method (including the dilution method and the full extraction method), if a NO ₂ converter has been built into the analyzer, the NO _x concentration value is the sum of the NO and NO ₂ concentrations in the flue gas, NO _x (mg / m3) = NO _x (ppm) * 2.054.

2 If the analyzer does not have a built-in NO ₂ converter, the NO _x concentration output is the NO concentration in the flue gas. At this time, the conversion factor needs to be used to correct the NO concentration value to NO _x. Content generally does not exceed 5% of NO content):

(1) Calculation of NOx emissions from coal-fired and oil-fired boilers with desulfurization measures:

NO _x = NO (mg / m3) * 1.53

(2) Calculation of NOx emissions from other coal-fired, oil-fired boilers or gas-fired boilers with dry dust removal

NO _x = NO (mg / m3) * 1.53 / 0.95

It mainly includes nitric oxide, nitrogen dioxide and

Nitrogen oxides can irritate the lungs, making it more difficult to fight colds and the like

Reductants are mainly used in the industry (

1. In recent years, the nitrogen oxide emissions from China's energy-related sectors have risen rapidly. In 2000, the national nitrogen oxide emissions were 12.1 × ^{10 6} t, and by 2005 it was 19.1 × 10 ⁶ t, with an average annual increase of 10%.

2. If no further emission reduction measures are taken, with the development of the national economy, population growth and acceleration of urbanization, China's nitrogen oxide emissions will continue to increase in the future. According to the current development trend, emissions will reach 2030 It will reach 35.4X10 ⁶ t, which will inevitably cause serious environmental impact. Therefore, it is necessary to strengthen the control of nitrogen oxide emissions.

3. Due to the wide range of sources of nitrogen oxide emissions, only by implementing energy-saving policies and emission control at the same time, on the one hand, implementing clean energy policies, on the other hand, strengthening the control of nitrogen oxide emissions on key areas such as power plants, industry, and transportation, can we effectively reduce 2030 Annual national nitrogen oxides emission levels.

4. China has a large amount of nitrogen oxides and a complex source, which has caused environmental problems such as acid deposition, fine particles, and ozone. It is necessary to further strengthen the research on the analysis of nitrogen oxides and pollution, and the development of regulations and standards. ^[4]