Lime Rotary Kiln
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  • Lime Rotary Kiln

Product Introduction

The rotary kiln for lime is a new type of rotary kiln specially designed for active lime, developed based on the calcination characteristics of limestone and by absorbing and referencing similar rotary kilns at home and abroad. This type of rotary kiln (optionally equipped with a vertical preheater and vertical cooler to form an energy-saving rotary kiln calcination system) features high raw material utilization, complete calcination, uniform quality, good product quality, large capacity, high operation rate, energy saving and environmental protection, simple operation, and long machine life.

Application Fields

Suitable for calcining limestone in metallurgy, chemical industry, and building materials industries.

Outstanding Advantages

1. The rotary kiln has stable output, suitable for large, medium, and small active lime production lines.

2. The kiln body has a simple structure, uniform heating, stable product quality, and low rates of underburning and overburning.

3. High raw material utilization, uniform quality, good product quality, and large capacity.

4. The vertical cooler installed at the kiln head not only rapidly cools the high-temperature lime but also improves the product's activity.

Working Principle

Dolomite is fed into the kiln through the chute at the kiln tail (high end). Due to the inclination and slow rotation of the cylinder, the dolomite rolls circumferentially while moving axially from the kiln tail (high end) to the kiln head (low end). Fuel is injected into the kiln through burners at the kiln head for combustion. Heat is transferred to the dolomite by radiation, convection, conduction, and other methods. Inside the kiln, the dolomite undergoes preheating, decomposition, and sintering processes, calcining into calcined dolomite, which is then discharged from the kiln head.

Technical Parameters

Capacity (t/d) 150 200 250 300 350 400 500 600 800 1000 1200
Main Equipment Main Supporting Equipment Models and Technical-Economic Indicators
Vertical Preheater YRQ04 YRQ06 YRQ06 YRQ08 YRQ08 YRQ10 YRQ12 YRQ12 YRQ14 YRQ18 YRQ20
Rotary Kiln φ2.5×40m φ2.8×43m φ3.0×48m φ3.2×50m φ3.3×52m φ3.6×55m φ3.8×58m φ4.0×60m φ4.3×65m φ4.9×70m φ5.1×72m
Vertical Cooler LSF36 LSF44 LSF56 LSF80 LSF112
Calcination Temperature /℃ 1100±50
Energy Consumption Index /(kCal/kg) 1200±100 ≤1150 ≤1100
Electricity Consumption Index /(kW·h/t) 40±5
Limestone : Lime 1.7~1.78:1
Lime Underburning and Overburning Rate /% ≤5
Lime Activity /ml ≥340 (specifically determined by the composition of limestone)
Discharge Temperature /℃ Ambient Temperature +60
Limestone Feed Size /mm 10~20/20~40
Emission Concentration /(mg/Nm3) ≤10
Annual Working Days / days ≥340
Major Overhaul Cycle / years 1~3
Number of Operators /(persons/shift) 2~3
Applicable Fuels Pulverized coal, coke oven gas, semi-coke gas, converter gas, blast furnace gas, calcium carbide furnace gas, natural gas, diesel, heavy oil, liquefied petroleum gas, biomass fuel

Keywords

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Lime Rotary Kiln
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  • Lime Rotary Kiln

Lime Rotary Kiln

The lime rotary kiln is the core equipment for lime production, used to calcine and decompose limestone (main component CaCO₃) at high temperatures into quicklime (CaO). Its main body is a closed steel cylinder lined with high-alumina refractory bricks. The cylinder is supported by a roller device with an inclination angle of about 3°-5°, and is driven by a transmission system to rotate slowly at 1-4 r/min. Material is added from the high end of the kiln tail, and fuel (pulverized coal or natural gas) is injected from the low end of the kiln head. The kiln's inclination and rotation enable counter-current heat exchange, completing the preheating, decomposition, and calcination processes.

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