ZERO REJECTION OF LIME DURING LANCE CHANGING IN MAERZ KILN.

摘要

An improved process for calcined lime production in parallel flow regenerative twin shaft kiln of MAERZ KILN with zero rejection comprising the steps of : charging of a predetermined quantity of lime stones into one of twin shaft kilns (3) maintaining a level from lance tip (6) to level sensor (7) of the kiln; heating the charge (9) by introducing an extra combustion air from Inlet point (5) as well as from lance tip (8);- filling the second twin shaft kiln (4) with a predetermined quantity charge of lime stones during this period; heating lime stone at a temperature 1050°-1060°C; - after completion of calcination operation in kiln (3), the calcined lime is taken out from the bottom outlet (12); 8 - the flue gas generated from shaft kiln (3) are passed through the connecting channel (11) and enters into shaft kiln (4) to preheat the charge of lime stone (9) in kiln (4); - after completion of calcination process of kiln (4), calcined lime is taken out from the (bottom outlet (12) and next starts calcination operation in kiln (3); - when kiln (4) is in operative condition, start filling of charge of lime stone in kiln (3), and the flue gas generated from kiln (4) are enter into kiln (3) through bottom to preheat the lime stone charge (9) of kiln (3); after completion of calcination operation in kiln (4), the calcined lime is taken out from the bottom outlet (13); the process of calcination continual in reversal way of operation alternatively firing takes place in shaft kiln (3) and next to kiln (4) to achieve maximum output with zero rejection