Green Valley Environmental protection: SCR denitrification technology to achieve zero exhaust emission of pyrolysis gasifier

Release time:

2024-12-20

With the development of economic globalization, the emission control of nitrogen oxides (NOx) in the tail gas of industrial boilers and pyrolysis gasifiers has become particularly important. SCR (Selective catalytic reduction) denitrification technology has been widely used in the field of industrial flue gas denitrification due to its high efficiency and reliability.

SCR denitrification technology under a certain catalyst and temperature, ammonia NH₃ reacts with NOx to convert NOx into harmless nitrogen N₂ and water H₂O. The core of this technology lies in the catalyst, which promotes the selective reaction between ammonia and NOx. The reaction equation is:

• NH₃·H₂O→NH₃↑+H₂O (Urea hydrolysis reaction)

• NO+NO₂+2NH₃→2N₂↑+3H₂O ₃

• 4NO+O₂+4NH₃→4N₂↑+6H₂O ₃ (NO reduction reaction)

• 2NO₂+O₂+4NH₃→3N₂↑+6H₂O ₃ (nitrogen dioxide reduction reaction)

The results showed that under the action of a certain catalyst, NOx ₃ reacts with NH to form harmless N₂ and H₂O, which effectively reduces the emission of harmful substances.

1. Composition of SCR denitration system:

(1) Catalyst

(2) PLC control system

(3) Compressed air supply system

(4) Urea supply system

(5) Reactor shell

(6) Jet mixing section

2. Advantages of SCR denitration technology:

(1) Low reaction temperature, high purification rate, up to 98% effect;

(2) Compact process equipment and reliable operation.

(3) Nitrogen is drained after reduction without secondary pollution.

Pyrolysis gasifier tail gas SCR denitrification equipment is an effective environmental protection technology, through the selective catalytic reduction technology significantly reduces the NOx content of industrial emissions, although there are some challenges, but the efficient denitrification rate and environmental friendliness make it one of the preferred technologies for industrial flue gas treatment. With the advancement and optimization of technology, SCR denitrification technology is expected to play a greater role in the future and make more effects for environmental protection.

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