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Active lime production line

Capacity: 200-1200t/d

Kiln slope: 3.5~4%

Diameter: φ1.8~φ4.8 m

Application: Lime production plant, cement plant, Hydrogen calcium plant

Process Description

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.

active lime production line working process

Limestone Calcining System

Main structure of rotary kiln:

1. Kiln Shell

2. Kiln Supporting Roller

3. Kiln Gear ring

4. Kiln Tyre

5.Transmission device

Main structure of lime kiln

Main structure of vertical cooler:

Grate bar and discharge device for big block

Cooling chamber lower the cooler

Support Device

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.

Hydraulic system

active lime production line working process 

Specifications

Designed capacity (T/D) 200 300 400 600 800 1000
Product active lime active lime active lime active lime active lime active lime
Preheater specifications RS-6.5×3.4 RS-7.5×3.4 RS-8.5×3.4 RS-10.×3.4 RS-10.8×3.4 RS-13.5×3.4
Number of push rod 6 8 10 12 16 18
Kiln specifications φ2.8×42M φ3.3×50M φ3.6×56M φ4×60M φ4.3×66M φ4.8×68M
Effective volume (m³) 190 292 430 575 738 1005
speed (r/min) 0.45-2.22 0.2-1.9 0.22-1.57 0.48-1.57 0.21-1.57 0.19-1.98
Cooler specifications LS-3×3 LS-3.6×3.6 LS-3.8×3.8 LS-4.1×4.1 LS-4.7×4.7 LS-5.2×5.2
Feed temperature 1100±50℃ 1100±50℃ 1100±50℃ 1100±50℃ 1100±50℃ 1100±50℃
Discharge temperature <100℃ <100℃ <100℃ <100℃ <100℃ <100℃
Weight(T) 35   40 50    
Heat rate (KJ/Kg) 5200 5200 5100 5000 5000 5000
Activity (50g,4NHCL,10MIN) ≥360ML ≥360ML ≥360ML ≥360ML ≥360ML ≥360ML

Projects

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.

active lime production line project

Advantages

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.

Auxiliary Equipment

Lime Rotary Kiln Lime Rotary Kiln
Kiln supporting roller Kiln supporting roller
Preheater Preheater
Girth Gear Girth Gear
Kiln Tyre Kiln Tyre
Cooler Cooler
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