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Cooling machine is a heat exchanger, is the key device of rotary kiln production system, with simple structure, stable performance, reliable operation and other advantages. The exhaust gas generated from the heat exchange can be introduced to the rotary kiln, thus improving the thermal efficiency of the entire system. According to its structure, cooler can be divided into monocular cooling machine, grate cooling machine and compound fertilizer drum cooling machine.
When cooler works, wet material is conveyed to the hopper through belt conveyor and bucket elevator, then be sent to the feed end of the hopper via feeding pipes through feeding machine. Material is fed from the higher end, and heat medium is discharged from low end to contact counter-current materials, sometimes heat medium will be sent into the cylinder together with material flow. With the rotation of the cylinder, materials run to the lower end of the cylinder under gravity. Wet material can directly or indirectly get heat from heat medium in the course of moving forward in the cylinder, to cool hot material, and then discharge and send materials at the end through spiral conveyor or belt conveyor. The cooled heat medium generally needs a cyclone dust collector for collecting materials filling in gas. If you need to further reduce exhaust dust content, bag filter or wet dust collector is needed before discharging.