I have been thinking about foundry furnace insulation.
If one were to use an open space between the hot face casting and additional insulation it should be possible to blow cold air through it. What if one were to take that now warm/hot air and run it back into the burner.
Obviously one would be in trouble if the air was hot enough to ignite the fuel in the burner pipe.
But why do this:
1: Less heat would get to the insulation. Cheaper insulation maybe?
2: The reclaimed heat would be recycled back into the furnace.
There are several things I don't like
1. Added complexity
2. Greater temperature differential between the two sides of the hot face. stress?
3. The possibility of light off the fuel inside the burner.
As I have envisioned it there is little doubt it is a bad idea. So why did I write it down. Because it was a tool for exploring the concept. And maybe it will lead to something better.
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