The removal of incandescent coke from ovens in factory courtyards regularly released thick yellowish smoke rings into the contaminated air of industrial zones.

Further, the grid may be arranged in the branching pipe (3) outside the vertical wall of the container so that it is not in contact, or only slightly in contact with incandescent coke.

A second chamber (200) contains high carbon waste input that is converted by the arc into incandescent coke, which converts co2 and h2o in the gas from the first chamber into more co, h2 and ch4, thereby forming a fuel gas (9).