Qualified limestone (20 ~ 50 mm) are lifted by bucket elevator to top silo of preheater. There are two level indicators (up and down) controlling the feeding amount, then they are separated averagely into preheaters’ individual rooms. The limestone’s temperature rises to about 900℃ heated by kiln flue gas of 1150℃, about 30% of them are decomposed, and they come into the rotary kiln by hydraulic rod, where the limestone decomposed into CaO and CO2. The decomposed limestone are put into the cooler, where its temperatures drops to 100℃ and released. The hot air (600°C) will come to kiln after heat exchange, and mix with coal gas for mixture combustion. The exhaust gas is released by the blower into bag deduster through multi-pipe cooler, then into the chimney though exhaust blower.The limestone from the cooler will be transported to the limestone final product silo through vibrating feeder, chain conveyer, bucket elevator, belt conveyer.
Main structure of rotary kiln:
1. Kiln Shell
3. Kiln Gear ring
4. Kiln Tyre
Main structure of vertical cooler:
Grate bar and discharge device for big block
Cooling chamber lower the cooler
Main structure of vertical preheater:
Upper feeding system: upper material bin, feeding chute
Preheater body: preheater chamber, suspension device
Stacker device: stacker part, frame, connecting rod.
|Designed capacity (T/D)||200||300||400||600||800||1000|
|Product||active lime||active lime||active lime||active lime||active lime||active lime|
|Number of push rod||6||8||10||12||16||18|
|Effective volume (m³)||190||292||430||575||738||1005|
|Heat rate (KJ/Kg)||5200||5200||5100||5000||5000||5000|
In 2014 , a building material factory from guangxi province of China purchased a lime production line with annual output of 400,000 tons. The main equipment includes φ4.0×60m rotary kiln, φ2.4×4.75m coal mill, 5000 m² bag type dust collector. And all of these equipment were made by CHAENG independently, and CHAENG provided installation and commissioning guidance.
1. High activity and good finished product effect
The activity of the finished product is as high as 360ml, the raw burning rate is less than 8%, and the quality is uniform.
2. Advanced technology, energy-saving and environmental protection
The calcination process is advanced and the energy consumption is low; the exhaust gas temperature is less than 220 ℃, which is convenient for dust collection and meets the requirements of energy-saving and environmental protection.
3. Large capacity
The single-line production capacity can reach 1200t/d.
4. High degree of automation and easy operation
Using DCS remote control system, high degree of automation.