CFB Boiler · Cyclone
The CFB cyclone separator is key gas-solid separation equipment. Its lining long-term bears high-velocity rotating scouring by ash-laden hot gas and temperature swings. Lining fall-out (brick or castable) is a common CFB failure, directly affecting separation efficiency and boiler safety.
High-velocity ash scouring: ash-laden gas rotates at high speed in the cyclone, strongly abrading barrel and cone linings. Thermal shock: start/stop and load swings cause rapid temperature changes; thermal shock cracks the lining. Anchor/masonry failure: castable anchors or brick mortar fail; the lining loses restraint and falls. Alkali attack: alkali in fuel ash attacks the lining.
After fall-out, separation efficiency drops, ash carryover rises and load capability falls; fallen blocks may plug the loop seal or damage equipment, forcing shutdown for repair.
Select cyclone lining for "high wear resistance + thermal-shock resistance":
Masonry/casting control: lay brick linings with staggered joints and full mortar; vibrate castable linings fully with strict water control. Bake-out: follow the curve to prevent wear-layer spalling. Acceptance: check surface flatness and thickness uniformity.
Monitor cyclone pressure drop and ash carryover; investigate on anomalies. At maintenance, measure barrel and cone residual thickness and patch or replace thinned zones; record wear data to optimize grade and thickness.
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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Corundum brick with Al₂O₃≥99% and refractoriness ≥2000℃ is chemically pure, resisting high temperature and gas/dust scouring—the premium refractory for critical hot zones.
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High-alumina brick LZ-65 (Al₂O₃≥65%, refractoriness ≥1790℃) has a higher corundum/mullite phase ratio for stronger slag resistance, higher temperature rating and better hot load-bearing capacity.
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