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Ceramics for RTO/RCO equipment
Heat Storage Ceramic Balls
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Ceramic Heat Storage Media
Application: Heat Storage Ball Combustion System
Heat storage ceramic balls are common heat storage media manufactured from alumina (Al₂O₃), kaolin, synthetic aggregate, mullite crystals and other raw materials. They are produced via two molding processes: pellet rolling and mechanical pressing, with a specific surface area up to 240 m²/m³.
During operation, massive small balls split the airflow into tiny streams, generating intense turbulence as gas flows through the media. This effectively breaks the boundary layer on the surface of heat storage bodies. In addition, their small diameter delivers short heat conduction radius, low thermal resistance, high density and excellent thermal conductivity, satisfying frequent and rapid switching of regenerative burners.
The ceramic balls feature high mechanical strength & wear resistance, great thermal conductivity and heat capacity for superior heat storage efficiency, as well as outstanding thermal stability without cracking under sharp temperature fluctuations. They are especially suitable as heat filling media for regenerators in air separation units and blast furnace gas heating furnaces in steel plants. By preheating both blast furnace gas and air simultaneously, the combustion temperature rapidly meets the requirements for steel billet heating in rolling mills.
This product overcomes the defects of ordinary heat storage balls such as easy slagging and pulverization, greatly improving energy-saving performance and service life.
Performance Item | High Alumina Q65/70 | Corundum Mullite QM70 | Chrome Corundum Mullite QCr-70 | Zirconia Corundum Mullite QZr-70 |
Al₂O₃ Content (%) | ≥65/70 | ≥70 | ≥70 | ≥70 |
Bulk Density (g/cm³) | ≥2.4 | ≥2.5 | ≥2.6 | ≥2.6 |
Packing Density (kg/m³) | 1500–1700 | 1450–1650 | 1550–1800 | 1550–1800 |
Specific Surface Area (m²/m³) | Φ11–13mm: 120–160Φ14–16mm: 105–120Φ17–19mm: 95–105Φ20–22mm: 80–95 | Same as left | Same as left | Same as left |
Thermal Expansion Coefficient (20–1000℃)(10⁻⁶/K) | ≤6.5 | ≤5.5 | ≤6.5 | ≤6.5 |
Specific Heat Capacity (J/g·K) | ≥1.05 | ≥1.0 | ≥1.05 | ≥1.05 |
Thermal Conductivity (W/m·K) | ≥1.5 | ≥1.6 | ≥1.7 | ≥1.7 |
Thermal Shock Cycles (1100℃ → 20℃ Water Quenching) | ≥25 | ≥30 | ≥30 | ≥35 |
Max Continuous Operating Temp (℃) | 1500/1550 | 1600 | 1600 | 1600 |
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