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Mullite Brick
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.
Learn More →Tube Hanger Brick Damage
Ethylene Cracking Furnace · Hangers
Problem Details
Background
The hanger bricks of an ethylene cracking furnace support furnace tubes and burners, long-term bearing high temperature (furnace above 1100℃), mechanical load and thermal shock. Hanger-brick damage fails tube support, affecting tube life and furnace safety.
Failure Mechanism
High-temperature creep: hanger bricks creep and deform under long-term hot load, losing support capacity. Thermal shock: decoking and furnace temperature swings thermally crack the bricks. Mechanical load: tube thermal expansion and vibration impose mechanical stress. Oxidation: high-temperature oxidizing atmosphere attacks the brick material.
Consequences
After damage, tube support fails and tubes deform and sag, endangering furnace safety; tube displacement may collide with and damage the lining, forcing shutdown for repair.
Solution
Material Selection and Parameters
Select hanger bricks for "high creep resistance + high strength + thermal-shock resistance":
- Material system: high-alumina brick (Al₂O₃≥65%) or mullite brick (Al₂O₃≥75%). Mullite resists creep, high temperature and thermal shock for hot load-bearing; high-alumina offers value;
- Structural design: design hangers per tube layout with reliable support and expansion allowance;
- Junction: treat hanger-lining connections to prevent loosening.
Installation Essentials
Precise installation: install hangers at design positions to guarantee tube support elevation. Inspection: check hanger-tube contact after installation. Furnace heating: follow the curve to avoid residual moisture.
Maintenance
Standardize decoking and control temperature swings; inspect hangers and tube support regularly, replacing deformed/cracked bricks promptly. At maintenance, check the whole hanging system and record hanger life to optimize grade and structure.
Recommended Products
High-Alumina Brick LZ-65
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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