Method for the treatment of finely grained material, particularly for the precalcining of cement
AssigneeKlockner-Humboldt-Deutz Aktiengesellschaft
InventorsKunibert Brachthauser, Hubert Ramesohl, Klaus Beisner, Horst Herchenbach
Life of this patent
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Abstract
A method and mechanism for calcining cement wherein the material is preheated in a precalcining zone and a vertical conduit leads heated discharge gases upwardly from a main calcining furnace, a supply of fuel and a supply of oxygen is fed to a preoxidation zone beneath the precalcining zone and raw material is fed into an admixing area above the burner with a deflector preventing particles from falling down into the preoxidation zone with the fuel being partially oxidized so that controlled heating and controlled oxidation occurs in the precalcining zone.
Claims8
A method for thermally treating finely grained material, comprising the steps:
- introducing the material to be calcined into a precalcining zone at an inlet;
- directing the flow of gaseous combustible fuel and oxygen into a preoxidation zone at a location spaced sufficiently below the material inlet that all the material is suspended and propelled upwardly thereof by gases rising through the preoxidation zone;
- partially oxidizing and thereby heating said gaseous combustible fuel in said preoxidation zone;
- directing the partially oxidized, mixture of hot, oxygen-containing fuel and oxygen upwardly into the precalcining zone and admixing the fuel with said material in said zone;
- and
- directing the precalcined material from the precalcining zone into a calcining furnace.
A method for thermally treating and oxidizing finely grained material, comprising the steps:
- passing exhaust gases from a calcining furnace upwardly through a conduit;
- admitting gaseous fuel into said conduit at a location therein together with oxygen;
- partially oxidizing said fuel in said conduit in a preoxidation zone having a theoretical flame length;
- admitting material to be treated into said conduit at an inlet spaced at least 1/4 of the theoretical flame length above said location at which fuel is admitted;
- admixing said material and said fuel in said conduit in an admixing zone maintained entirely above said fuel admittance location;
- precalcining said material in said conduit in a precalcining zone;
- and
- passing said material through a cyclone separater and to said furnace.
Dependencies are inferred from the claim text.