Rotary Kiln

A rotary kiln processes material through physical and chemical reactions as its slowly rotating shell tumbles the charge through hot gas. Applications include cement clinker burning at around 1450°C and limestone calcination to quicklime. Mechanical wear parts are concentrated in the shell support and drive systems.

Equipment Parts

Part Identification and Technical Details

Explore part names, images, material options and technical requirements. Select a card to open the corresponding replacement part page.

Major Components and Assemblies

Major Components and Assemblies

Individual and Maintenance Parts

Individual and Maintenance Parts

01

Tyre / Riding Ring / Support Ring

Kiln Tyre / Riding Ring

Material Options

ZG35CrMo / ZG42CrMo cast steel

Installation and Function

Supports the shell and carries its full weight

Maintenance Category

Low

02

Roller / Support Roller

Support Roller / Carrying Roller

Material Options

42CrMo / 35CrMo cast steel, subject to the specified casting grade

Installation and Function

Supports the tyre to keep the shell rotating smoothly

Maintenance Category

Low

03

Thrust Roller

Thrust Roller

Material Options

42CrMo cast steel, subject to the specified casting grade

Installation and Function

Controls axial movement of the kiln shell

Maintenance Category

Low

04

Kiln Shell Liner

Kiln Shell Liner

Material Options

Heat-resistant cast steel / high-chromium cast iron / SiC castable

Installation and Function

Protects the shell against wear from hot material

Maintenance Category

ZH

05

Girth Gear

Girth Gear / Bull Gear

Material Options

ZG45 / ZG35CrMo cast steel

Installation and Function

Main gear that rotates the shell

Maintenance Category

Low

06

Pinion

Pinion

Material Options

40Cr / 42CrMo alloy steel

Installation and Function

Drive gear that meshes with the girth gear

Maintenance Category

ZH

07

Kiln Inlet / Outlet Seals

Kiln Inlet / Outlet Seal

Material Options

Heat-resistant alloy / flexible graphite

Installation and Function

Prevents air and material leakage

Maintenance Category

ZH

08

Tyre Support Pad

Tire Pad / Filler Pad

Material Options

Carbon steel / alloy steel

Installation and Function

Spacer that adjusts the clearance between the tyre and shell

Maintenance Category

ZH

09

Girth Gear Guard

Girth Gear Guard

Material Options

Carbon Steel

Installation and Function

Protects the girth gear from dust contamination

Maintenance Category

Low

10

Refractory Lining

Refractory Lining

Material Options

High-alumina brick / magnesia-chrome brick / SiC castable

Installation and Function

Refractory insulating layer inside the shell

Maintenance Category

ZH

Materials for similarly named parts may differ by OEM, machine model and operating conditions. Confirm the machine model, OEM drawing number and measured dimensions before ordering or manufacture.

Material Information

• ZG35CrMo / ZG42CrMo are candidate chromium-molybdenum steel grades for heavily loaded support castings. Verify composition, heat treatment and mechanical properties against the grade standard and drawing.
• 42CrMo: quenched and tempered alloy steel, offering a balance of strength and toughness for suitable support-roller and gear applications.
• Select internal metal wear parts and refractory linings separately for temperature, atmosphere, thermal cycling and material attack. Ordinary high-chromium cast iron is not a general solution for the high-temperature burning zone.
• SiC castable: a silicon-carbide refractory option for hot, chemically aggressive kiln-inlet feed zones, subject to process compatibility.

Brand Applicability

FLSmidth (FLS), KHD Humboldt Wedag, thyssenkrupp (Polysius), Pengfei, Sinoma, SBM, CITIC

Industry Applications

Cement clinker burning, limestone calcination for reactive lime, alumina calcination, ore magnetization roasting, hazardous-waste incineration and lightweight-aggregate firing.