Methods of and apparatus for treating waste products

In apparatus for treating waste products of the type comprising an incinerator furnace including at least one rotary section having a peripheral wall for the combustion and/or pyrolysis of the waste products and a stationary section between said rotary section and a recuperator and having a peripheral wall for guiding exhaust fumes generated in said furnace from the rotary section;

• said recuperator including means for causing the exhaust fumes to flow in a state of heat exchange with a heat-carrier fluid for exploitation of the heat thus recovered;
• the improvement which comprises a circuit for recovery of the heat of the furnace, said circuit conducting a flow of heat-carrier fluid in the direction extending from said recuperator toward the peripheral wall of one or both of said stationary section and said rotary section of said furnace and in the direction returning from said peripheral wall toward said recuperator to preheat the fluid in said recuperator, wherein said circuit comprises juxtaposed tubes connected in parallel between a distributor duct and a collector duct, which ducts are arranged opposite and parallel to one another longitudinally with respect to said furnace, wherein said tubes, with sheet metal elements welded therebetween, form a casing delimiting the volume occupied by the fumes within said furnace, and wherein some of said tubes at least partially form a stationary front closing off said furnace at an extremity thereof remote from said recuperator.