Thermal Shock Resistance of Composite Plate Thermal Regenerators
A brief overview of the thermal shock resistance of combined plate thermal regenerators.
Thermal Shock Resistance of Composite Plate Thermal Regenerators
Composite plate thermal regenerators are frequently subjected to thermal shock in RTOs (Regenerative Thermal Oxide), making thermal shock resistance a core indicator determining their service life.
Core Mechanism
Sudden temperature changes create thermal stress due to the temperature difference between the inner and outer layers. Cracking occurs when this thermal stress exceeds the material's strength. The key to thermal shock resistance lies in effectively dispersing and releasing thermal stress.
Material Influence
Material | Coefficient of Thermal Expansion (×10⁻⁶/℃) | Thermal Shock Resistance |
Cordierite | 1.5-2.5 | Best |
Corundum-Mullite | 5-7 | Good |
Silicon Carbide | 4-5 | Good |
Cordierite is the preferred material for RTO (Regenerative Thermal Oxidizer) regenerators due to its lowest coefficient of thermal expansion and best thermal shock resistance.
Structural Design Influence
Design Factors | Impact on Thermal Shock Resistance |
Panel Thickness | Thin plates (≤0.5mm) have lower thermal stress; thick plates result in concentrated thermal stress |
Panel Shape | Rounded transitions are better than right angles; corrugated plates are better than straight plates |
Connection Method | Modular (with gaps) > Integrated (sintered) |
Installation method affects
Rigid compression: restricts expansion, thermal stress cannot be released → prone to cracking
Loose stacking: allows free expansion, good thermal shock resistance, but requires protection against airflow impact and displacement
Layered restraint: balances fixation and expansion freedom → recommended method
Measures to improve thermal shock resistance
Measures | Effects |
Using cordierite material | Reduces thermal expansion |
Reducing plate thickness (≤0.5mm) | Minimizes temperature difference |
Employing a modular structure | Releases thermal stress |
Designing rounded transitions | Eliminates stress concentration |
Reserving expansion gaps | Allows for free expansion |
Summary
The thermal shock resistance of modular plate thermal regenerators can be summarized as follows: material is fundamental (cordierite is optimal), structure is key (modular is superior to monolithic), and installation is crucial (extension gaps are provided). For operating conditions with frequent temperature fluctuations, a modular structure using thin cordierite plates (≤0.5mm) should be prioritized, with expansion gaps provided. Only through the synergistic optimization of these three aspects can long-term stable operation be achieved.