Re: Gas fired oven
I talked to an engineer at a local manufacturer that has an automatic powder coating line. They use a gas oven. He said there were three things to look out for when designing a gas oven for powder coating.
1. Put a variable speed blower in either the fresh air input or the exhaust vent to insure enough air flow and allow purging the oven when needed.
2. Use several small burner rather then one larger burner. This gives you better temperature control.
3. Use a three skin design rather than a two skin design. Use an insulation layer sandwiched between the two outside skins as with an electric oven. Then put a third skin inside to separate the firebox from the curing chamber. The firebox is really just a space on the bottom of the oven big enough for the burners that extends up both sides of the oven. The the floor of the curing chamber should be solid to prevent powder from falling directly onto the burners. The sides of the curing chamber can have vents to allow direct exchange between the firebox and curing chamber with out danger of powder falling back onto the burner.
Dave
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