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De-Nitrogen Oxides

    De-Nitrogen Oxides

    DeNOx is a common abbreviation in environmental engineering for the process of Denitrogen Oxides. It refers to technologies and processes designed to remove nitrogen oxides (NOx)—primarily nitric oxide (NO) and nitrogen dioxide (NO₂)—from exhaust gases produced by industrial combustion processes .
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DeNOx is a common abbreviation in environmental engineering for the process of Denitrogen Oxides. It refers to technologies and processes designed to remove nitrogen oxides (NOx)—primarily nitric oxide (NO) and nitrogen dioxide (NO₂)—from exhaust gases produced by industrial combustion processes .



Primary Technological Methods


DeNOx technologies are broadly classified into two categories: combustion control and post-combustion treatment.


Combustion Control (Preventive Measures)

These technologies focus on modifying the combustion process itself to suppress the formation of NOx.

- Low-NOx Burners (LNB): These are designed to control the mixing of fuel and air to achieve lower peak flame temperatures and reduce oxygen availability in the NOx-forming zones, thereby minimizing NOx generation.


Post-Combustion Treatment (End-of-Pipe Solutions)

These are the most widely applied DeNOx methods, treating the Flue Gas after combustion has occurred. The two dominant technologies are SCR and SNCR.

DeNOx


Application Field


DeNOx systems are critical in numerous industries, including:

- Coal-fired and Gas-fired Power Plants

- Industrial Boilers and Furnaces (e.g., in steel, cement, glass, and chemical industries)

- Waste Incineration Plants

- Marine and Automotive Exhaust Treatment (the core principles are similar, though the systems are adapted for mobile use) 

Technical Features



• The denitration efficiency high, can reach more than 90%; 

• Export escape ammonia concentration is low, fully meet the national standards; 

• SO2 to SO3 conversion rate is low, generally less than 1%; 

• Honeycomb or plate type catalyst unit design, ensure that the catalyst effective surface area; 

• Special gas device ensure the Flue Gas and reducing agent are evenly distributed, achieve good denitration efficiency; 

• The reactor can be arrangement between the economizer and air preheater, or after the Desulfurization tower; 

• Provide ammonia or liquid NH3 two options, can meet different needs; 

• Small system resistance, less than 1000 pa; 

• To adapt to the temperature range: 160 ~ 510 ℃; Mature and stable. 

DeNOx is an abbreviation for De-Nitrogen Oxides. It refers to a set of technologies and processes designed to remove nitrogen oxides (NOx) from exhaust gases produced by industrial facilities, power plants, and vehicles .


Primary DeNOx Technologies

There are two main approaches to controlling NOx emissions: pre-combustion control and post-combustion treatment. The most widely used and efficient methods are post-combustion.

SCR:Selective Catalytic Reduction

Injects a reductant (e.g., ammonia or urea) into the exhaust stream in the presence of a catalyst, converting NOx into harmless N₂ and H₂O .

SNCR:Selective Non-Catalytic Reduction

Injects a reductant (e.g., ammonia or urea) into a high-temperature zone of the furnace without a catalyst, reducing NOx to N₂ .


Environmental Importance

Controlling NOx emissions through DeNOx technologies is vital for protecting our environment and health. The benefits include:

- Improved Air Quality: Reducing NOx directly lessens the formation of ground-level ozone and smog .

- Mitigation of Acid Rain: NOx gases are a primary cause of acid rain, which harms ecosystems, forests, and aquatic life.

- Protection of Human Health: Exposure to NOx is linked to respiratory diseases like asthma and other lung conditions .


Technical Features



• The denitration efficiency high, can reach more than 90%; 

• Export escape ammonia concentration is low, fully meet the national standards; 

• SO2 to SO3 conversion rate is low, generally less than 1%; 

• Honeycomb or plate type catalyst unit design, ensure that the catalyst effective surface area; 

• Special gas device ensure the Flue Gas and reducing agent are evenly distributed, achieve good denitration efficiency; 

• The reactor can be arrangement between the economizer and air preheater, or after the Desulfurization tower; 

• Provide ammonia or liquid NH3 two options, can meet different needs; 

• Small system resistance, less than 1000 pa; 

• To adapt to the temperature range: 160 ~ 510 ℃; Mature and stable. 

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