Pre-hydrolysis pressure vessel system comprising a cleaning arrangement

A pre-hydrolysis pressure vessel system comprising:

• a material inlet for receiving biomass material to be treated in the pre-hydrolysis pressure vessel system;
• a material outlet for expelling treated biomass material out from the pre-hydrolysis pressure vessel system;
• and
• a transport screw arrangement comprising:
• an enclosing housing;
• and
• a transport screw provided in the enclosing housing, said transport screw being configured for transporting biomass material through the enclosing housing towards the material outlet of the pre-hydrolysis pressure vessel system,
• wherein said enclosing housing comprises a cleaning arrangement, said cleaning arrangement comprising:
• at least one elongated fluid channel provided along at least a part of a length (L1) of the enclosing housing, each defined by at least an inner wall of the enclosing housing, wherein each elongated fluid channel comprises a plurality of fluid outlets separated along a length (L2) of the respective fluid channel, and
• at least one cleaning fluid inlet which is provided through the enclosing housing in fluid connection with the at least one fluid channel whereby a cleaning fluid can be provided into the enclosing housing from outside the enclosing housing, via the cleaning fluid inlet and through the at least one fluid channel and said fluid outlets for cleaning the transport screw and/or the inner wall of the enclosing housing,
• wherein at least some of the fluid outlets are provided with an opening being at least 10 times wider than its height, and a height of at least some of the fluid outlets is between 0.05-1 mm.

A pre-hydrolysis pressure vessel system comprising:

• a material inlet for receiving biomass material to be treated in the pre-hydrolysis pressure vessel system;
• a material outlet for expelling treated biomass material out from the pre-hydrolysis pressure vessel system;
• and
• a transport screw arrangement comprising:
• an enclosing housing;
• and
• a transport screw provided in the enclosing housing, said transport screw being configured for transporting biomass material through the enclosing housing towards the material outlet of the pre-hydrolysis pressure vessel system,
• wherein said enclosing housing comprises a cleaning arrangement, said cleaning arrangement comprising:
• at least one elongated fluid channel provided along at least a part of a length (L1) of the enclosing housing, each defined by at least an inner wall of the enclosing housing, wherein each elongated fluid channel comprises a plurality of fluid outlets separated along a length (L2) of the respective fluid channel, and
• at least one cleaning fluid inlet which is provided through the enclosing housing in fluid connection with the at least one fluid channel whereby a cleaning fluid can be provided into the enclosing housing from outside the enclosing housing, via the cleaning fluid inlet and through the at least one fluid channel and said fluid outlets for cleaning the transport screw and/or the inner wall of the enclosing housing,
• wherein the fluid outlets comprise both perpendicular fluid outlets and tangential fluid outlets, wherein the perpendicular fluid outlets are positioned such that fluid is delivered out from the at least one fluid channel via the perpendicular fluid outlets in a perpendicular direction to the inner wall and the tangential fluid outlets are positioned such that fluid is delivered out from the at least one fluid channel via the tangential fluid outlet in a tangential direction to the inner wall.