Silicon carbide heat exchangers can work stably in high - temperature environments and are suitable for heat transfer and mass exchange in high - temperature, high - pressure, and corrosive environments. They can directly recover the waste heat of high - temperature flue gas at 850 - 1400°C emitted from various industrial kilns to obtain high - temperature combustion - supporting air or process gas. In gas combustion systems, silicon carbide heat exchangers are used to improve thermal efficiency and save energy.