LOW NOx CALCINER
AssigneeFLSmidth A/S
InventorsDamien Grévain, Mads Nielsen
Life of this patent
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Abstract
A system for reducing NOx emission levels during the manufacture of cement clinker having a calciner unit with the following features: an upper portion; a lower portion; a NOx reduction zone in the lower portion; a tertiary air inlet in the upper portion for introducing tertiary air into the upper portion; a main calciner meal inlet located above the NOx reduction zone for introducing a main calciner meal portion into the upper portion; a first cooling calciner meal inlet located in the NOx reduction zone for introducing a first cooling calciner meal portion into a periphery of the NOx reduction zone; and a fuel inlet located in or below the NOx reduction zone for introducing fuel into the reduction zone.
Claims8
A system (1) for reducing NOx emission levels during the manufacture of cement clinker comprising a calciner unit (11) further comprising:
- an upper portion (11a);
- a lower portion (11b);
- a NOx reduction zone (12) in the lower portion (11b) having a refractory layer (12a) on the inside surface thereof;
- a tertiary air inlet (13) in the upper portion (11a) for introducing tertiary air into the upper portion (11a);
- a main calciner meal inlet (20) located above the NOx reduction zone (12) for introducing a main calciner meal portion into the upper portion (11a);
- a first cooling calciner meal inlet (30a) located in the NOx reduction zone (12) for introducing a first cooling calciner meal portion into a periphery of the NOx reduction zone (12) for forming a peripheral layer of meal in the NOx reduction zone (12) for protecting the refractory layer (12a) from hot kiln gas;
- and
- a fuel inlet (50a) located in or below the NOx reduction zone (12) for introducing fuel into the NOx reduction zone (12) for supporting a hot core of the hot kiln gas within the peripheral layer of the meal in the NOx reduction zone (12).
Dependencies are inferred from the claim text.