Reactor vessel for biomass material

An elongated pressurized reactor vessel for biomass material, the elongated pressurized reactor vessel comprising:

• a substantially tubular vessel part comprising:
• a first end, and
• a second end;
• a first gable connected to the first end, the first gable being inwardly dished;
• a second gable connected to the second end, the second gable cooperating with the substantially tubular vessel part and the first gable to enclose a vessel internal compartment, the second gable being inwardly dished;
• a material transporting screw configured for transporting the biomass material through the elongated pressurized reactor vessel, the material transporting screw comprising:
• a central shaft provided within the vessel internal compartment, extending between the first gable and the second gable along a central axis, and protruding out of the vessel internal compartment through at least one of the first gable or the second gable, the central shaft being configured to be connected to a rotation device that is configured to rotate the central shaft around its longitudinal axis, and
• a screw flight provided around the central shaft;
• a first bearing mounted on the first gable and supporting the central shaft, the first bearing facilitating rotation of the central shaft around its longitudinal axis;
• and
• a second bearing mounted on the second gable and supporting the central shaft, the second bearing facilitating rotation of the central shaft around its longitudinal axis.