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It all comes down to volatility.
In the USA bituminous coal is divided into high-volatile, medium volatile, and low volatile groups. Metallurgical grade Blacksmithing Coal would fall into the low-volatile group. The higher the volatile rating the more the coal fire will propagate or spread. Lower volatile coal SHOULD coke without moisture being added. Herein lies the rub.. Adding water does several things that work against us.
Another issue we have is in the misuse of the name "Blacksmithing Coal." In order to fit this classification it must be metallugical grade bituminous and contain less than 25% volatile matter. Does yours?
Next up: Why Fluctuate your forge air?