System and method for cogeneration from mixed oil and inert solids, furnace and fuel nozzle for the same

A furnace for combustion of a mixture of combustables and noncombustibles comprising:

• a primary combustion chamber arranged along a longitudinal axis between a front and a rear, the primary combustion chamber rotating about the longitudinal axis and the longitudinal axis being tilted downwardly from the front to the rear, the primary combustion chamber comprising a plurality of discrete sections, the sections having a stepped decreasing diameter whereby a step is formed between sections;
• a cap at the front of the primary combustion chamber, the cap being rotatably mounted to the primary combustion chamber and the cap remaining in a fixed orientation as the primary combustion chamber rotates, the cap having a first port and a second port;
• a secondary combustion chamber having a front and a rear, the front of the secondary combustion chamber being interconnected by a passage to the second port at the front of the primary combustion chamber, the rear of the secondary combustion chamber being interconnected to a flue;
• and
• a delivery assembly that delivers the mixture through the first port into an airspace at the front to the primary combustion chamber, wherein the combusted mixture generates combusted gasses that flow through the passage into the secondary combustion chamber where they are further combusted and directed to the flue, the solids being directed to the rear of the primary combustion chamber to an outlet.