1. Cylinder Shell

Manufactured from low-alloy high-strength steel plate by rolling and welding, with an inclination angle of approximately 3.5% and rotating speed ranging from 0.5–3 r/min. The interior is lined with zone-specific refractory linings: magnesia-iron spinel bricks or direct-bonded magnesia-chrome bricks for the burning zone, high-alumina bricks for the transition zone, and refractory castable at the feed end, forming a protective kiln coating capable of withstanding a calcination temperature of 1450℃.

- Reinforcing rings are welded externally, with riding rings (tyres) mounted on the shell;

- Primarily supported by a three-support configuration;

- Fabricated in sections and assembled on-site.

2. Support & Alignment System

- Riding Rings (Tyres): Fitted around the cylinder shell via backing plates and saddles to transmit the full load of the kiln.

- Support Roller Assemblies (3 supports, 6 roller units): Equipped with double-row self-aligning roller bearings and forced lubrication, bearing the weight of the riding rings.

- Hydraulic Thrust Rollers: Control axial movement of the cylinder shell to compensate for thermal expansion and contraction, preventing end-face wear between riding rings and support rollers.

- Foundation Base: Consists of concrete and steel structure, leveled by secondary grouting.

3. Drive System

- Main Drive: Variable-frequency motor + hardened gear reducer + pinion + girth gear.

- Auxiliary Drive: Enables slow rotation during main power failure to avoid thermal bending of the cylinder shell.

- Speed and torque monitoring with closed-loop speed control.

4. Kiln Outlet System (Discharge End)

- Kiln hood lined with high-strength wear-resistant castable, multi-channel pulverized coal burner (coal injection pipe with adjustable flame profile).

- Inspection ports, infrared temperature and pressure measuring points, kiln outlet seal (scale-type + graphite block composite seal).

- Connected to a grate cooler to recover secondary air for combustion; clinker discharges from the kiln outlet into the cooler.

5. Kiln Inlet System (Feed End)

- Kiln inlet chamber, feed chute and feeding duct.

- Kiln inlet seal (flexible seal to prevent air ingress and dust leakage).

- Connected to preheater and calciner; raw meal enters from the kiln inlet and exchanges heat countercurrently with high-temperature flue gas.

6. Sealing System

Composite sealing system at both kiln inlet and kiln outlet (scale-type, graphite or pneumatic seal) with adaptive performance under thermal conditions. Air leakage rate is controlled within 1%–2%, preventing cold air ingress and hot flue gas and dust emission, maintaining stable negative pressure inside the kiln.

7. Auxiliary Systems

- Lubrication System: Centralized oil station providing forced lubrication and cooling for support rollers, reducers and gear meshing surfaces.

- Cooling System: Circulating water cooling for bearings and thrust rollers.

- ECS / PLC Intelligent Control System: Remote monitoring, alarm, interlock protection and automatic parameter adjustment.