Process for controlling rotary calcining kilns, and control...

Details Process for controlling rotary calcining kilns, and control... Process for controlling rotary calcining kilns, and control...

B - Operations, Transporting

01

J

B01J 6/00 (2006.01) C10B 49/04 (2006.01) C10B 57/16 (2006.01) F27B 7/42 (2006.01) F27D 21/00 (2006.01)

Patent

CA 2124139

A process and control system for controlling a rotary calcining kiln having a feed material inlet for material to be calcined, a calcined product outlet and a high temperature zone in which said material is calcined, the high temperature zone being movable within the rotary calcining kiln according to changes in operational control variables of the rotary calcining kiln. The process comprises measuring temperatures within the rotary calcining kiln at various positions spaced from each other along the rotary calcining kiln in a region overlapping apredetermined desired position for the high temperature zone, and adjusting the control variables to move the high temperature zone to the desired position when the high temperature zone deviates from the desired position. In the process, the temperatures are measured by thermocouples having thermocouple junctions protected by heat and abrasion resistant sheaths, preferably made of alumina/silicon carbide ceramics, positioned within the rotary calcining kiln.

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