I have sometimes used woodstove pellets with success. They coke up much like coal at the edge of the fire and burn hot and clean. The btu output is about half that of coal, so you need to use more of it. It is cheap and available. If you cantrol the size of the fire with water the pellets break down to a saw dust pulp that can be used for a cave type fire. Welding heat was no problem. ymmv
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Iron... the other thermal plastic
"He was the kind of a guy that could screw up an anvil with a tack hammer"
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