Material remediation in multi-function heating drum

Material remediation apparatus comprising:

• a material remediation drum assembly including a drum having a material intake end and a material discharge end, a first heating zone disposed within the drum and adjacent to the material intake end and extending from the material intake end inward into the drum, and a second heating zone disposed within the drum and adjacent to the material discharge end, a combustion chamber tube having a gas intake end adjacent to the material discharge end of the drum, a gas outflow end internally of the drum and being disposed concentrically within the drum and within the second heating zone thereof, the length of the second heating zone and the length of the combustion chamber tube within the drum coinciding with each other and extending to the first heating zone, the combustion chamber tube enclosing longitudinally of the drum a centrally disposed combustion chamber and forming with the drum an annular space between the drum and the combustion chamber tube for accommodating gas flow and material moving from the material intake end to the material discharge end of the drum, and means for moving the material from the material intake end through the first heating zone of the drum and then through the annular space in the second heating zone of the drum to the material discharge end;
• a burner assembly disposed at the material discharge end of the drum, the burner assembly including means for generating a combustible mixture of gases and for directing the generated combustible mixture of gases from the material discharge end into the material remediation drum assembly to flow into the combustion chamber tube toward the first heating zone of the material remediation drum assembly;
• means, communicatively disposed with respect to the generated combustible mixture of gases, for igniting the generated combustible mixture of gases and generating a stream of combustion gases within the combustion chamber tube, the stream of combustion gases extending through the first heating zone in a counterflow direction to the flow of material therethrough;
• and
• means, including the combustion chamber tube, for inducing a gaseous reflow of a portion of the combustion gases to be diverted through the annular space between the drum and the combustion chamber tube in the direction toward the material discharge end of the drum, and through the gas intake end into the combustion chamber tube.