Energy Saving Rotary Lime Kiln Process during Active Lime Production

During all the active lime production process, the rotary kiln production process is the most advanced one. Our production process adopt the rotary kiln with the vertical preheater and vertical cooler for the limestone calcination to achieve the production requirements of energy saving, environmental protection, the high activity. We can provide technological solutions and complete production equipment for 50-800TPD quicklime (active lime) production line.

Function of Vertical Preheater and Cooler

Vertical preheater is equipped at the kiln inlet. It will use the hot air from rotary kiln to preheat the raw material which also can partially decomposed inside the preheater. This will increase the 40% of output capacity and 30% of thermal efficiency. Vertical cooler is equipped at the kiln outlet. It will use the high temperature from the calcined material to heating the secondary air to 600℃. Kiln outlet adopts integration design for vertical cooler and kiln outlet hood, and it needs less construction land and good sealing.

Production Process

10-50mm qualified limestone are fed to receiving hopper by loader. The vibrating feeder under the hopper will feed limestone to inclined belt and then transport to screening equipment. After screening, the limestone will be transported to the top silo of preheater by inclined belt conveyor. Limestone are fed from top silo to preheater through feeding chute. At the meantime, the hot air from rotary kiln will preheating the limestone to more than 1000℃ and also can partially decomposed. Preheated limestone are pushed into kiln inlet by hydraulic pusher and discharged into vertical cooler after calcination at rotary kiln. The cooling air blows by fan can cool down the temperature of material to room temperature +60℃ and then discharged out of vertical cooler. After discharging from vertical cooler, active lime will be transported to lime silo by apron conveyor, bucket elevator and belt conveyor. Temperature of hot air from rotary kiln can be reduced to 250℃ after heat exchange with limestone inside the preheater. Then the hot air will flow into cyclone dust collector for primary dust collecting. After bigger size dust are collected, the waste air will flow into bag filter for secondary dust collecting. The emission dust concentration is less than 50mg/m3.