Equipment for and method of precalcining any mineral materials whatsoever
AssigneeCle
InventorMaurice Paliard
Life of this patent
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Abstract
An equipment for precalcining any mineral materials whatsoever comprising a precalciner consisting of a combustion chamber communicating through a passage-way with a reaction chamber itself communicating via a duct with a separation cyclone, the reaction chamber being fed with smokes issuing from a firing furnace and three ducts feeding with hot air issuing from a cooler the combustion chamber, a voluted casing at the level of a burner and said duct, respectively, the equipment in particular permitting the manufacture of cement clinker while greatly minimizing the emission of nitrogen oxides.
Claims8
A method for precalcining a mineral material in powder form comprising the steps of:
- feeding a mineral material into a combustion chamber,
- directing a first hot air stream into said combustion chamber,
- feeding fuel into said combustion chamber through a burner,
- directing a second hot air stream into said combustion chamber in proximity to said burner,
- passing combustion gases and the mineral material from said combustion chamber into a reaction chamber in which precalcination occurs,
- directing the combustion gases and mineral material in said reaction chamber into contact with gases containing nitrogen oxides discharged from a firing furnace,
- directing a third hot air stream in a post combustion zone into contact with a stream of resultant products of the gases and mineral material from said reaction chamber, and thereafter separating the resultant precalcined mineral material from the gases and discharging the separated gases, and
- directing the precalcined mineral material to the firing furnace.
Dependencies are inferred from the claim text.