Reactor discharge screw

Abstract

The invention relates to a discharge screw arrangement () for discharging lignocellulosic material () from a lignocellulosic treatment reactor () and comprises a discharge screw (), a feeder pipe () and a blow pipe (), the discharge screw being accommodated in and rotatably arranged inside the feeder pipe and being configured to mechanically transport the lignocellulosic material in a longitudinal direction along a rotational axis of the discharge screw through the feeder pipe towards a downstream end () of the feeder pipe, which discharge screw arrangement is configured to allow steam to flow through the feeder pipe to help transporting the lignocellulosic material in the longitudinal direction along through the feeder pipe and out of the feeder pipe through an outlet nozzle () arranged in a side wall of the feeder pipe () at the downstream end of the feeder pipe and into the blow pipe, wherein the discharge screw arrangement further comprises a material spreader (), which is rotatably arranged at the downstream end of the feeder pipe and is configured to transport the lignocellulosic material in a radial direction, perpendicular to a rotational axis of the material spreader, towards the outlet nozzle, which is arranged peripherally of the material spreader, and out of the feeder pipe through the outlet nozzle and into the blow pipe.