Pulverized Coal Boiler · Peepholes & Sootblowers
The peephole (observation) and soot-blower holes of a pulverized-coal boiler are passages for observation and blowing operations. Hole bricks long-term bear high-temperature radiation, direct flame action and soot-blowing media scouring. Peephole-brick damage is a common boiler issue, affecting sightlines and wall sealing.
High-temperature radiation and flame action: peepholes face furnace flame; hole bricks overheat from radiation and flame scouring. Blowing-media scouring: soot-blower holes are scoured by steam or compressed air, wearing the bricks. Thermal shock: opening/closing and blowing operations cause rapid temperature changes, cracking hole bricks. Structural loosening: loose brick-wall connections widen joints and let broken bricks fall.
After damage, sightlines are blocked, wall sealing degrades, air leakage hurts combustion; fallen bricks may damage blowers or enter the furnace, forcing shutdown for replacement.
Select peephole bricks for "high-temperature resistance + thermal-shock resistance + wear resistance":
Masonry control: firmly lay hole bricks with the wall, joints ≤2mm. Cover installation: install covers flexibly and reliably with good sealing. Bake-out: follow the curve to avoid residual moisture in mortar.
Standardize blowing operations to reduce hole-brick scouring; inspect hole-brick condition and sealing regularly, replacing cracked bricks promptly. At maintenance, check the brick-wall junction to keep observation and blowing holes intact.
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.
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Mullite brick with mullite as the main phase (Al₂O₃≥75%, refractoriness ≥1850℃, RUL ≥1650℃) offers high-temperature volume stability with excellent thermal-shock and creep resistance.
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