Lime production line
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Introduction

Chaeng machinery can undertake the 200-1500 t/d activity lime production line EPC, including the reach report, civil engineering, designing equipment, installation and debugging---"turnkey" service with production capacity and standard achieved.

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Lime production line Features

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 lime 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.

 

Characteristics of Active Lime Production Line:

1. Large production, maximum capacity can reach 1500t/d

2. Quality of final product is well-distributed, and over-sintering is no more than 8%.

3. Activity of lime can reach 400ml

Main structure of Active Lime Production Line:

Main equipment of active lime production line

Main structure of vertical cooler

Grate bar and discharge device for big block

Cooling chamber lower the cooler

Support Device

Main structure of rotary kiln

1. Body

2. Riding wheel

3. Gear ring

4. Tire

5. Transmission 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

Production process of active lime production line

Advantages of rotary kiln to calcine active lime


 1. The rotary kiln has high output and is suit for being applied to the large active lime production line. In the world now, there is lime rotary kilns with the capacity of 2,200t per day being put into production; many 150-300 t/d lime rotary kilns have been established and run well at home and abroad. The rotary kiln can also be adopted by middle and small-sized enterprises.

2. The rotary kiln is open-calcination kiln with simple structure, and the sulfur-containing flue gas can be discharged timely without the adhesion of the sulphur materials, which makes the sulphur content of the product be low and meet the steelmaking requirements. In addition, the materials evenly roll forward in the kiln and are evenly heated, so the the quality of the product is stable with low underfiring and overfiring rate, and the rotary kiln can calcine the lime with high activity for steelmaking. Under the same conditions, the activity degree of the lime produced by the rotary kiln is higher (averagely 30ml higher) than the activity of the lime produced by the gas kiln, and generally the activity degree of the lime produced by the rotary kiln is 340-380ml even up to 400ml.
 
3. The rotary kiln can directly calcine the 10-50mm limestone. For general mines, the 0-30mm limestone which can not be processed by other kiln type accounts for 30-40% of the total output. And with the raw materials of the iron and steel being more refined, the limestone is gradually replaced by the quick lime in the sintering process and the fine-sized limestone can not be comprehensive utilized. Building a production line with rotary kiln can not only utilize high-quality limestone mine, but also achieve the sustainable development of the lime industry.

4. Equipping a vertical preheater at the kiln tail can fully utilize the high-temperature flue gas to preheat the limestone with normal temperature to the initial decomposition state, which can not only enormously improve the output of the rotary kiln, but also fully reduce the heat consumption of the unit product.


5. Equipping a vertical cooler at the kiln head can not only suddenly cool the high-temperature lime and improve the activity of the product, but also be convenient for transporting and storage. It can also obtain the secondary air entering the kiln with higher temperature, which can efficiently improve the firing temperature in the kiln and reduce the fuel consumption.

6. The flue gas discharged from the vertical preheater at the kiln tail has low temperature, about 280-350℃ with low dust content about 20g/Nm3, which makes the configuration of the follow-up flue gas treatment be simple and efficient to smoothly meet the environmental requirements.

7. The biggest advantage of the rotary kiln is that the quality of the lime it produced is stable.

Configuration

 

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
  • 300,000 t/a
  • 600,000 t/a
  • 1,000,000 t/a
  • Equipments of Production Line

    Equipment Type: GRMS33.31 Slag Vertical RollerMill

    Power Consumption of system: 30 kWh/t

    Standard Production Capacity: 50 t/h

    Effective Diameter of Millstone: 3300 mm

    Number of Roller: 3

  • Equipment of Production Line

    Equipment Type: GRMS46.41 Slag Vertical Roller Mill

    Power Consumption of System: 38 kWh/t

    Standard Production Capacity: 105 t/h

    Effective Diameter of Millstone: 4600 mm

    Number of roller: 4

    Specific surface: 4200~4500cm2/g

  • Equipment of Production Line

    Equipment Type: GRMS53.41 Slag Vertical Roller Mill

    Power Consumption of System: 40 kWh/t

    Standard Production Capacity: 160 t/h

    Effective Diameter of Millstone: 5300 mm

    Number of Roller: 4

    Specific Surface: 4200~4500 cm2/g

  • 1,000 t/d Clinker
  • 2,500 t/d Clinker
  • 3,000 t/d Clinker
  • 4,000 t/d Clinker
  • 5,000 t/d Clinker
  • Production Line Equipments

    a. GRMR22.30 Raw Material Vertical Roller Mill

    b. GRMC12.30 Soft Coal Vertical Roller Mill

    c. φ3.2×48 Rotary Kiln

    d. φ3.8×13 Cement Mill

  • Production Line Equipments

    a. GRMR38.41Raw Material Vertical Roller Mill

    b. GRMC20.30Soft Coal Vertical Roller Mill

    c. φ4.0×60 Rotary Kiln

    d. φ4.2×13 Cement Mill (2 Sets)

  • Production Line Equipments

    a. GRMR40.41 Raw Material Vertical Roller Mill

    b. GRMC22.30 Soft Coal Vertical Roller Mill

    c. φ4.2×60 Rotary Kiln

    d. φ4.2×13 Cement Mill (2 Sets)

  • Production Line Equipments

    a. GRMR48.41 Raw Material Vertical Roller Mill

    b. GRMC23.30 Soft Coal Vertical Roller Mill

    c. φ4.5×66 Rotary Kiln

    d. φ4.2×13 Cement Mill (2 Sets)

  • Production Line Equipments

    a. GRMR53.41 Raw Material Vertical Roller Mill

    b. GRMC26.30 Soft Coal Vertical Roller Mill

    c. φ4.8×72 Rotary Kiln

    d. φ4.2×13 Cement Mill (3 Sets)



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