Grate Incinerator · Furnace
The furnace side walls of a mechanical-grate incinerator line the core combustion zone, long-term bearing high temperature (850–1100℃), flame radiation, waste/ash abrasion and flue-gas corrosion. Side-wall brick erosion and thinning are common incinerator lining issues, directly affecting safety and life.
High temperature and flame radiation: furnace temperature is high; flame continuously radiates the walls with high brick temperature and thermal load. Waste and ash abrasion: waste falling, turning and ash flow abrade the walls. Flue-gas corrosion: acid gases (HCl, SO₂) and alkali metals in incineration gas attack the bricks. Thermal shock: ignition, shutdown and waste-charge fluctuations cause rapid temperature changes, shocking the bricks.
After thinning, the furnace shell overheats and corrodes with leakage risk; fallen bricks may plug the grate or damage equipment, forcing shutdown and reducing incineration-line availability.
Select furnace side walls for "high-temperature resistance + wear resistance + corrosion resistance":
Masonry control: lay with staggered joints, full mortar and joints ≤2mm. Locking: lock circumferentially against loosening. Bake-out: follow the curve to avoid residual moisture in mortar.
Control furnace and flue-gas temperature within process range to avoid prolonged over-temperature; inspect side-wall bricks and shell temperature regularly, assessing erosion/thinning promptly. At maintenance, measure residual thickness and replace thinned zones; record erosion data to optimize grade.
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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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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Spalling-resistant high-alumina brick introduces ZrO₂ (3-6%) for transformation and microcrack toughening. Al₂O₃≥70%, thermal-shock stability ≥15 cycles, greatly improved resistance to structural spalling under frequent temperature cycling.
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