Rotary kiln belongs to building material equipment, and it can be divided into cement kiln, metallurgy chemical kiln and lime kiln according to different materials. Lime kiln is used for baking active lime and dolomite in the steel factory and ferroalloy factory.
During lime rotary kiln drying, should allow sufficient time, especially when changing the brick kiln , kiln because less material, and no kiln skin, so the skin and other refractory kiln heat evenly and there is a certain the heat content . In general, there is material in the kiln and kiln leather case and a cold kiln heating needs eight hours,short-term stop the kiln, in accordance with the corresponding five- cylinder outlet temperature rotating kiln drying time, change the brick kiln, heating time is usually ten six hours. And before ignition, all devices should be stand-alone test and linkage test, especially commissioning and trial production stage, to avoid heating up and then back on refractories disadvantage, namely the costs of oil and increased costs.
When the ignition drying kiln, generally the first use of light diesel oil , coal feeding system startup kiln, kiln drying ignition and initial feeding,try to use high volatile, low ash smaller, less water and coal fineness easy powder to keep the complete combustion of pulverized coal as possible to avoid the process of pulverized coal drying kiln and preheater kiln deposited slopes. And drying kiln temperature curve to follow strictly, this process should not be able to pay attention to the rotary limestone kiln too exhaust, otherwise there will be an illusion, five- cylinder high temperature, and the temperature inside the rotary kiln equipment is not high, so firing with low temperatures, no sufficient heat content in the exhaust by feeding a pulverized coal will not burn, long black attempting severe kiln see the fire, the chimney ESP black smoke, so that it is possible to feed fail, and it is very dangerous and harmful. Generally in the heating process rotary kiln control oxygen content of about four to six percent most appropriate.
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