Arrangement, system and method for handling non-wood plant material

A feeding arrangement for feeding non-wood plant material having a bulk density of 40-90 kg/m3 to a treatment vessel, the feeding arrangement comprising

• a plug screw feeder including an inlet section for feeding the plant material to the treatment vessel, the plug screw feeder comprising a plug screw having a longitudinal axis and a corresponding plug screw housing surrounding the plug screw,
• a force-feeding screw including a longitudinal axis for feeding the plant material to the plug screw feeder and a corresponding force-feeding screw housing surrounding the force-feeding screw,
• the force-feeding screw being arranged to provide the material to the inlet section of the plug screw feeder,
• wherein the longitudinal axis of the force-feeding screw is arranged essentially perpendicular to the longitudinal axis of the plug screw, and
• a feeding device for feeding incoming material to the force-feeding screw
• wherein the plug screw is capable of rotating at variable speed in relation to a production flow rate set by the feeding device, said force-feeding screw including
• a distance (D) between an outermost point of a last screw thread, as seen in the direction of the longitudinal axis of the force-feeding screw, the distance (D) between an outermost point of said last screw thread of the force-feeding screw to a point on the outer diameter of the plug screw at the inlet section of the plug screw feeder being up to 90 mm.