Rotating tube heat treatment installation, in particular rotating tubular kiln, with indirect heat feed or dissipation

A rotary tubular heat treatment installation, comprising:

• an outer rotatably mounted jacket tube;
• an inner rotary tube situated within said outer jacket tube substantially coaxial therewith, said inner rotary tube having an outer surface in which grooves are formed, said grooves extending in a longitudinal direction relative to said outer jacket and inlet rotary tubes;
• means for connecting said inner rotary and outer jacket tubes to each other for rotation with each other, said connecting means comprising a plurality of pins spaced around the entire circumference of said outer jacket tube, each of said pins being resiliently mounted in a radial direction and extending between said inner rotary and outer jacket tubes, each of said pins engaging said inner rotary tube to radially support said inner rotary tube within said outer jacket tube, an inner engagement portion of each of said pins being receivable in a respective one of said grooves to enable relative displacement between said outer jacket tube and said inner rotary tube in said longitudinal direction;
• stationary heat exchange medium inlet and outlet connections fixedly mounted on respective longitudinal ends of said outer jacket tube, said inlet and outlet connections being removable from said outer jacket tube in a longitudinal direction relative to said outer jacket and inner rotary tubes, and
• means for rotating said outer jacket tube.