Method for continuously cooking grass raw materials and device

A method for continuously cooking grass raw materials comprising:

• (1) preparing material:
• preparing grass raw materials by conventional dry or wet method to obtain a chopped grass;
• (2) pre-cooking:
• 1) conveying the chopped grass into a T-shaped tube after being extruded by a screw feeder, adding a cooking liquor and steam from a top of the T-shaped tube and mixing with the chopped grass in the T-shaped tube to obtain a forage;
• 2) adding steam into a horizontal tube from a bottom of the horizontal tub after the forage being into the horizontal tube, the forage being heated and going into a spherical mixer;
• 3) adding a cooking liquor extruded by a dehydration spiral into the spherical mixer, mixing uniformly with the forage in the spherical mixer, completing a pre-cooking process;
• (3) cooking:
• conveying the forage after the pre-cooking process to a digester, heating the cooking liquor by a heater arranged outside the digester, and sending the cooking liquor back to the digester for cooking the forage to obtain a pulp of the grass raw materials.