Method and device for controlling a process for burning a lime containing mixture to burnt lime

A method and a device for controlling a process for burning lime containing mixture (CaCO3) and converting it to calcinated lime (CaO) in a rotary kiln, the rotary kiln having an elongated cavity surrounded by a wall and a burner arranged to heat the cavity. The method includes collecting measuremen...

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Bibliographische Detailangaben
Hauptverfasser:	LEDUNG LARS, DAHLQVIST ERIK
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE BLASTING CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE FUNCTIONAL ELEMENTS OF SUCH SYSTEMS FURNACES FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL HEATING KILNS LIGHTING LIME, MAGNESIA MECHANICAL ENGINEERING METALLURGY MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS OPEN SINTERING OR LIKE APPARATUS OVENS PHYSICS REFRACTORIES REGULATING RETORTS SLAG TREATMENT OF NATURAL STONE WEAPONS
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Beschreibung
Zusammenfassung:	A method and a device for controlling a process for burning lime containing mixture (CaCO3) and converting it to calcinated lime (CaO) in a rotary kiln, the rotary kiln having an elongated cavity surrounded by a wall and a burner arranged to heat the cavity. The method includes collecting measurement data of the temperature in the wall at a plurality of measuring points along the longitudinal axis of the cavity, predicting the actual temperature gradient along the longitudinal axis of the cavity based at least on the measurement data of the temperature in the wall, and by means of a thermal model describing the temperature along the cavity of the kiln, determining a desired temperature gradient along the cavity based on the predicted temperature gradient along the cavity and a predetermined control strategy controlling the temperature in the kiln.