Pulverized Coal Boiler · Burner Zone
The burner zone (arch zone) of a pulverized-coal boiler maintains furnace temperature and combustion stability. It suffers high-temperature flue-gas scouring and coal-air impact, plus severe temperature changes at ignition and shutdown. The castable lining here cracks and detaches as a whole—the weak link of the boiler lining.
Hot gas scouring: flame temperature reaches 1300–1500℃ in the burner zone; high-velocity gas carrying coal particles imposes thermal impact and abrasive scouring. Coal impact: coal-air flow directly impacts the arch surface, causing local wear and erosion. Thermal shock: ignition, shutdown and purging cause rapid temperature changes; thermal-shock stress cracks the lining. Anchor failure: anchors oxidize at high temperature or are under-specified; the unrestrained lining detaches as a whole. Over-temperature operation: prolonged over-temperature over-fires the castable, lowering strength and accelerating spalling.
Arch fall-out destabilizes furnace temperature and combustion, hurting efficiency and low-load stability; fallen blocks may plug the cold ash hopper or damage equipment, forcing shutdown for repair.
Select burner-zone lining for "high-temperature resistance + thermal-shock resistance + reliable anchoring":
Water control: follow the datasheet; excess water lowers strength and washout resistance. Full vibration: vibrate fully for tight bonding with anchors and substrate. Bake-out: follow the curve and complete dehydration before ignition. Anchor inspection: check weld quality before and embedment after placement.
Avoid prolonged over-temperature operation; keep burner-zone temperature in a reasonable range. Inspect the arch surface regularly and patch cracks promptly; at maintenance, focus on anchor corrosion and lining bonding, re-welding or replacing failed anchors.
SiC wear-resistant castable with SiC≥50% aggregate offers extreme hardness and erosion resistance to 1600℃. High thermal conductivity promotes slag-coating self-protection. For CFB boiler cyclone barrels and cones, loop seals, copper flash furnace cones, launders and elbows under heavy wear.
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LA-60 high-alumina castable uses bauxite clinker aggregate with Al₂O₃≥60% and a max service temperature of 1600℃. Its low-cement bond gives high density and good thermal-shock resistance.
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Brown corundum castable based on dense fused alumina with Al₂O₃≥85%, 1750℃ max service and CCS≥90MPa. High hardness, refractoriness and excellent slag resistance. Used in steel ladle working linings and slag lines, main iron runners, converter mouth areas and CFB boiler cyclone wear zones.
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