SinePari, I've read some conversations on using turbo chargers in a foundry application, but I don't remember how it all turned out. I would think a better chance would be had of it working on a closed system like a foundry or JCP1969's salt pot where the exhaust gasses can be forced in the direction you want them to go. My forge is open on both ends and the exhaust follows the path of least resistance. Most days the bulk of dragons breath goes out the back, but a slight change in wind direction will cause it to come out the front. Also temperature control and an oiling system would have to be taken into consideration. If the turbo was allowed to get too hot the oil will coke up.
James, I'm not really sure how a paint pot or the gun it comes with works. I would assume that if it will spray latex paint it would spray some fairly thick oil. Having said that I can't recall anyone using one for the purpose we have in mind. The regular old paint guns like you would spray a car with I have seen used many times In a foundry setting. I'm just not sure how fine tunable they are as I've never used one. Some prefer to pressurize their fuel tank to deliver the fuel to the nozzle. I'm not a big fan of this for two reasons. The first is a safety issue, If the tank is pressurized and a leak develops it won't stop squirting fuel until the pressure is released. The second is convenience, if you run out of fuel while in use you will have to shut down and release the pressure before you can refill the tank. With the raised tank you can add fuel while the forge is running.
The concern over the air compressor running all the time may be blown out of proportion a little. These nozzles are designed to lift a certain amount of fuel at a certain psi. and then atomize it. however if you put the fuel source above the nozzle you've removed the need to lift it and are left with only the need to atomize it. Fuel will run through these nozzles with no assistance at all if the fuel is above it. only it will come out in a solid stream instead of a spray.
Also atomization of the fuel imho is more important on start up because finely atomized fuel is easier to light and removes the need for a preheat. Once the forge is up to temp atomization is less crucial because larger fuel droplets will vaporize instantly upon hitting the forge. Heck I think that you could almost feed pats of butter into it and keep forging.
There has been a lot of talk of using heat exchangers in a foundry setting, but those involved were trying to achieve maximum efficiency in combination with reaching insane temperatures. With a forge and oil we don't really need to be concerned with either. propane has about 91,000 BTU per gallon along with a price per gallon that varies with location and time of year. The Btu's for a gallon of waste oil vary from 140,000 to 240,000 (that higher # seems a little fantastic) and a price per gallon that is usually 0$. The insane energy and low cost allows me to beat my inefficient forge into submission with brute force.
The picture of the spray pattern is with diesel while it was still mounted in the torpedo heater. In the winter I thin my oil just a little, maybe a pint of diesel to 5 gallons of oil
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