Clinker Calcination Equipment
Cement Rotary Kiln
The heart of every cement plant — a heavy-duty rotary kiln engineered for the high-temperature
calcination of raw meal into cement clinker. Featuring advanced mechanical design, superior
thermal efficiency, intelligent process control, and flexible capacity from 100 to 10,000
tonnes per day. 20+ models for dry and wet process lines.
φ1.9×39 – φ6.0×95mShell Size
100-10,000 t/dCapacity
3-5%Slope
20+ ModelsDry & Wet Process
Product Overview
About the Cement Rotary Kiln
The cement rotary kiln is a cylindrical, slightly inclined, rotating furnace that converts
preheated and partially calcined raw meal into cement clinker at material temperatures of
1,400–1,500°C. The kiln shell rotates slowly on supporting rollers, tumbling the material
downward through the burning zone where fuel combustion provides the intense heat required for
the clinkering reactions — the formation of calcium silicates (C₃S, C₂S), calcium aluminate
(C₃A), and calcium aluminoferrite (C₄AF).
In a modern dry process cement plant with NSP (new suspension preheater)
technology, the rotary kiln works in series with a cyclone preheater and precalciner, which
raise raw meal temperature to about 900°C and achieve 70–90% calcination before the material
even enters the kiln. This allows the kiln to focus on the final sintering stage, dramatically
reducing its required length and fuel consumption. LIMING Machinery manufactures rotary kilns
for both dry and wet process lines, with shell diameters
from φ1.9m to φ6.0m and lengths from 39m to 95m.
Built from premium boiler-quality steel plate, cast-steel kiln tyres, and forged girth gears,
LIMING rotary kilns deliver decades of reliable continuous service. Advanced features include
hydraulic thrust rollers, variable-frequency drive, lamella/graphite kiln seals, and
computer-optimized support station alignment — ensuring stable operation, low heat
consumption (≤3,050 kJ/kg clinker for NSP lines), and long refractory life.
Maintenance
Rotary Kiln Maintenance Tips
Proactive maintenance is the key to long campaigns, stable clinker quality, and avoiding costly unplanned shutdowns. Focus on these three areas:
1. Refractory Lining
- Use high-quality basic bricks (magnesite-chrome, magnesia-spinel, magnesia-hercynite) in the burning zone and high-alumina bricks in the transition and inlet zones.
- Monitor coating thickness with a shell scanner — a stable coating protects the brick and extends campaigns to 12–18 months.
- Avoid rapid heating/cooling that causes thermal shock and brick spalling. Follow a controlled heating-up schedule after a new lining installation.
2. Sealing System
- Inspect kiln seals at both ends daily. Replace worn seal elements promptly to prevent false-air ingress, which raises exhaust volume and fuel consumption.
- Maintain proper lubrication of spring-loaded and pneumatic seal mechanisms to ensure uniform contact pressure around the circumference.
3. Mechanical & Internal Parts
- Check support roller contact bands and tyre surfaces weekly; keep rollers clean and properly lubricated to avoid uneven wear and shell ovality.
- Monitor girth gear and pinion tooth contact pattern and backlash; adjust thrust rollers to control axial float within design limits.
- Inspect internal lifters, dam rings, and kiln mouth materials regularly — wear here disrupts material flow and gas exchange.