Secondary Combustion Chamber · Chamber
The secondary combustion chamber completes flue-gas reburning and dioxin destruction in waste incineration. Operating above 1100℃, its lining bears high-temperature gas, alkali/chlorine attack and thermal shock; the castable spalls and alkali-cracks—a high-frequency failure zone.
Alkali/chlorine attack: incineration gas is rich in alkali metals (K, Na) and chlorine, which enrich on the lining surface and in pores, reacting with the matrix into low-melting chlorides, causing "alkali cracking" and loosening. Hot-gas scouring: high-velocity gas above 1100℃ thermally scours the lining. Thermal shock: ignition, shutdown and load swings cause rapid temperature changes; thermal-shock stress spalls the lining. Corrosion: HCl, SO₂ and other acid gases condense and attack in cooler zones.
After spalling, vessel walls overheat and corrode, the ability to guarantee dioxin-destruction temperature weakens, and environmental emission risk rises; forced shutdown shortens incineration-line availability.
Select the secondary combustion chamber for "alkali/chlorine resistance + high-temperature resistance + thermal-shock resistance":
Monolithic placement: cast barrel and cone monolithically with staggered joints. Vibration: vibrate fully to reduce pores (alkali/chlorine penetration paths). Water control: follow the datasheet strictly. Bake-out: follow the curve and complete dehydration before commissioning.
Control flue-gas temperature ≥1100℃ and residence time, optimizing combustion and mixing; inspect lining surface and shell temperature regularly. At maintenance, patch spalled zones, replace failed anchors and evaluate alkali/chlorine attack trends to optimize grade.
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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Alkali-resistant castable engineered for alkali attack with low alkali-reactive aggregates forming a dense protective layer. Al₂O₃≥40%, 1350℃ max service, resisting alkali vapors and salts.
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Corundum-mullite castable combines the hot strength of corundum with the thermal-shock resistance of mullite. Al₂O₃≥80%, 1700℃ max service.
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