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 ot 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 cylcone 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.
1. Saving energy
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.
2. Environmental protection
Good dust collecting treatment at kiln inlet. The cyclone dust collector and pulse bag filter can control the dust emission is lower than China standard. High level of automation requires less workers, the adjusting of production system operation, control and alarm are controlled at control room by PLC.
|Qty. Of Hydraulic Pusher||6||6||8||8||8||10||12||12|
|Preheating Capacity (t)||600||600||800||800||800||1000||1600||1600|
|Qty Of Temperature Control Area||3||3||3||3||3||3||3||3|
|Product Thermal Loss(kcal/kg)||5500||5400||5400||5400||5400||5400||5400||5000|
|Available Fuel||Coke oven gas, mixed gas, natural gas, coal powder, low heating value coal gas|
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