SCR CONVERTER CONSTRUCTION/OPERATION [MZR-CD 2.2]SM1934590
SCR CONVERTER CONSTRUCTION/OPERATION [MZR-CD 2.2]
id0116f2276000
• A SCR converter utilizing a zeolite catalyst has been adopted.
• NOx is purified by deoxidization while passing through the SCR converter.
Pyrolysis/hydrolysis
• Produces ammonia from AdBlue®.
-
― (NH
2)
2CO → NH
3+ HNCO (pyrolysis)
― HNCO + H
2O → NH
3 + CO
2 (hydrolysis)
Deoxidization process
• NOx is reduced by ammonia produced by pyrolysis and hydrolysis.
-
― 4NH
3+ 4NO + O
2→ 4N
2+ 6H
2O
― 4NH
3+ 2NO
2+ O
2→ 3N
2+ 6H
2O
― 2NH
3+ NO
+ NO
2→ 2N
2+ 3H
2O
• Any remaining ammonia after NOx deoxidization is removed while it passes through the slip catalyst in the SCR converter.
Oxidization removal
• Removes ammonia by oxidization.
-
― 4NH
3+ 3O
2→ 2N
2+ 6H
2O