This is because at high temperatures alkaline fly ash is known to attack heat exchange media with a high percentage of silica but will not have the same negative affect on alumina. However, high alumina media is more expensive and would not be necessary in fly ash free applications.
In summary, engineers should pay close attention to the selection of the proper ceramic heat exchange media. Making the right media selection is just as important as the type of RTO.
If you are considering a rebuild or have maintenance concerns, we can help. If you think your media is settling, experiencing chemical attack by evidence of softening, cracking or degradation of the media beds, cold face support plugging, or burner exposure in which the burner’s flame temperature is higher than the ceramic melting temperature, you may need LDX Solutions’ assistance.