Cyclone Cone Wear

Preheater & Precalciner · Cyclone Cone

Problem Details

Background

The cyclone cone of a cement preheater is the passage for gas-solid separation and material descent. Dust-laden gas rotates at high speed in the cone, strongly abrading the lining. Cone wear and thinning are common preheater issues, directly affecting separation efficiency and material circulation.

Failure Mechanism

Dust-laden gas scouring: gas rotating at high speed in the cone abrades the lining; the lower cone and throat wear most. Material abrasion: descending raw-meal powder abrades the cone lining. Thermal shock: kiln swings and start/stop cause temperature changes; thermal shock cracks the lining. Alkali/sulfur attack: alkali and sulfur enrich and attack the cone.

Consequences

After wear and thinning, lining fall-out risk rises, separation efficiency drops and material circulation worsens; fallen blocks may plug the downcomer, forcing kiln shutdown for repair.

Solution

Material Selection and Parameters

Select cyclone cone lining for "high wear resistance + thermal-shock resistance":

Material system: high-alumina brick (Al₂O₃≥55%) or SiC brick (SiC≥85%). High-alumina offers value; SiC's hardness and wear resistance suit the heaviest lower-cone and throat zones;
Structural design: thicken the lower cone and throat with ample wear allowance;
Joint materials: lay with high-alumina mortar and tight joints.

Installation Essentials

Masonry control: lay cone bricks with staggered joints, full mortar and joints ≤2mm. Special shapes: use special-shaped bricks at diameter transitions to reduce cut-brick joints. Bake-out: follow the curve to avoid residual moisture in mortar.

Maintenance

Monitor cyclone pressure drop and separation efficiency; investigate on anomalies. At maintenance, measure lower-cone and throat residual thickness and patch or replace thinned zones; record wear data to optimize grade and thickening.

Recommended Products

Silicon Carbide Brick

Silicon carbide brick (SiC≥85%, refractoriness ≥1900℃, CCS≥120MPa) offers high thermal conductivity, extreme wear resistance, thermal-shock resistance and molten-salt resistance—preferred for waste incineration and hot abrasion duties.

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Featured

High-Alumina Brick LZ-55

High-alumina brick LZ-55 (Al₂O₃≥55%) with refractoriness ≥1770℃ offers dense structure, wear resistance against gas scouring and combined cold/hot strength—one of the most widely used shaped refractories.