Agitator rotors and agitator systems for solids

A process vessel comprising an agitator rotor system comprising:

• a first rotor comprising:
• a first shaft defining a first longitudinal axis,
• first rails extending radially from and coupled to the first shaft, wherein the first rails are separated from each other along a first length of the first shaft and each of the first rails comprises a first surface defining a non-zero angle with respect to the first longitudinal axis of the first shaft, and
• a first rod comprising a first end coupled to a first one of the first rails and a second end coupled to a second one of the first rails, wherein a first projection of the first end and the second end of the first rod in a first plane perpendicular to the first longitudinal axis of the first shaft defines a first minor arc about a portion of the first shaft;
• a third rod comprising a fifth end coupled to a third one of the first rails and a sixth end coupled to the second one of the first rails, wherein the second end of the first rod and the sixth end of the third rod are coupled to the second one of the first rails on opposing sides of a perimeter of the first shaft in a plane perpendicular to the first longitudinal axis of the first shaft;
• a hollow inner rod disposed within at least a portion of the first rod, wherein a first void space between the inner rod and the first rod defines a first annulus;
• and
• a second inner rod disposed within the first shaft, the second inner rod extending across a portion of the first shaft between the first rails, wherein a second void space between the second inner rod and the first shaft defines a second annulus;
• wherein the first annulus is configured to allow a first portion of a heating medium to flow therethrough and the second annulus is configured to allow a second portion of the heating medium to flow therethrough;
• and
• a second rotor comprising:
• a second shaft defining a second longitudinal axis,
• second rails extending radially from and coupled to the second shaft, wherein the second rails are separated from each other along a second length of the second shaft and each of the second rails comprises a second surface defining a non-zero angle with respect to the second longitudinal axis of the second shaft,
• a second rod comprising a third end coupled to a first one of the second rails and a fourth end coupled to a second one of the second rails, wherein a second projection of the third end and the fourth end of the second rod in a second plane perpendicular to the second longitudinal axis of the second shaft defines a second minor arc about a portion of the second shaft,
• wherein the first rails and the first rod of the first rotor and the second rails and the second rod of the second rotor are arranged in a cavity in the process vessel, the first rotor configured to rotate about the first shaft defined by the first longitudinal axis of the first rotor, and the second rotor configured to rotate around the second shaft defined by the second longitudinal axis of the second rotor.