Grate Cooler · Hot End
The hot end of a grate cooler sits below the cement kiln outlet, directly receiving hot clinker (1350–1450℃) falling from the kiln, plus scouring by hot secondary and tertiary air. Falling-clinker impact combined with hot-gas abrasion makes this the most severely damaged zone of the cooler lining.
Clinker impact: hot clinker falls from the kiln mouth onto the roof and side walls; mechanical impact crushes and detaches lining. Hot-gas abrasion: secondary/tertiary air carrying clinker dust flows at high velocity, abrading the lining. Thermal shock: kiln swings and shutdowns cause rapid temperature changes; thermal-shock stress cracks the castable. Anchor failure: anchors oxidize and loosen at high temperature; unrestrained lining detaches in blocks.
After hot-end lining damage, the cooler shell overheats and deforms and cooling efficiency drops; fallen castable blocks may plug grate openings, hurting clinker cooling and conveying, forcing kiln shutdown for repair.
Select the cooler hot end for "impact resistance + wear resistance":
Zonal placement: cast roof and walls in continuous sections with construction joints away from stress concentration. Vibration: vibrate fully for tight anchor bonding. Water control: keep at the datasheet lower limit for wear strength. Bake-out: follow the curve to prevent early spalling.
Monitor cooler shell temperature and cooling air pressure; investigate on anomalies. At maintenance, check residual thickness of roof and wall impact zones and patch or replace zones beyond limits; record data to optimize thickening and grade selection.
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Wear-resistant castable with hard abrasion-resistant aggregate, Al₂O₃≥70%, 1500℃ max service and CCS≥90MPa. Dense matrix resists particulate erosion in gas-solid two-phase flow.
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