Material Selection for Combined Plate Heat Storage
Briefly introduces how to select the material for a modular plate heat storage body based on the flue gas temperature.
Material Selection for Combined Plate Heat Storage
Material selection primarily depends on the flue gas temperature; different materials exhibit significant differences in their upper temperature resistance limits and overall performance.
Temperature Resistance Properties of Various Materials
Material | Maximum Operating Temperature | Thermal Shock Resistance | Relative Cost |
Cordierite | 1200-1300℃ | Excellent | 1 (Benchmark) |
High Alumina | 1300-1400℃ | Good | 1.2-1.5 |
Corundum-Mullite | 1450-1600℃ | Good | 2.0-3.0 |
Silicon Carbide | 1350-1400℃ | Good | 3.0-4.0 |
Zirconium-Corundum | 1500-1700℃ | Average | 4.0-6.0 |
Choose according to temperature range
Flue Gas Temperature | Recommended Materials | Reasons |
≤1000℃ | Cordierite | Best thermal shock resistance, lowest cost |
1000-1200℃ | High-alumina or corundum-mullite | Cordierite is nearing its upper limit |
1200-1450℃ | Corundum-mullite | Good resistance to high-temperature creep |
>1450℃ | Zirconium corundum | Highest temperature resistance |
Core Principles
Allow a 150-200℃ safety margin, meaning the material's maximum operating temperature should be 150-200℃ higher than the highest flue gas temperature. For example, at 950℃ flue gas, cordierite (1200℃) has a 250℃ safety margin, making it safe to use; at 1150℃ flue gas, high-alumina materials (1300-1400℃) are needed, while cordierite only has a 50℃ safety margin, posing a higher risk.
For frequently fluctuating operating conditions, cordierite remains the first choice for ≤1000℃ due to its excellent thermal shock resistance; above 1000℃, both temperature resistance and thermal shock resistance need to be considered, making corundum-mullite the preferred choice.
Summary
Material selection can be summarized as follows: ≤1000℃: choose cordierite (economical and shock resistant); 1000-1200℃: choose high-alumina materials; 1200-1450℃: choose corundum-mullite; >1450℃: choose zirconium corundum. The core principle in selecting a model is to leave sufficient safety margin, rather than just looking at the highest temperature.