Method for processing biomass

Abstract

The invention relates to a method for processing biomass, such as in particular green waste containing wood, and a high density pulper having a spiral, wherein the green waste is treated in a continuously operated, bladed pulper and then the separated fibers are ground in a pulper ball mill.

1 . A method for preparing biomass, such as in particular wood-containing green waste, in which the biomass is treated in a continuously operated, bladed pulper and then the separated fibres are milled in a pulper ball mill. 
     
     
         2 . The method according to  claim 1 , wherein the consistency in the bladed pulper is from 10 to 20% dry content. 
     
     
         3 . The method according to  claim 1 , wherein the speed of the blade relative to the biomass in the bladed pulper is above 10 m/s. 
     
     
         4 . The method according to  claim 1 , wherein the separated fibres have a length between 1 mm and 5 mm. 
     
     
         5 . The method according to  claim 1 , wherein the biomass is processed dry before treatment in the continuously operated bladed pulper. 
     
     
         6 . The method according to  claim 1 , wherein the biomass is heated before treatment in the continuously operated bladed pulper. 
     
     
         7 . The method according to  claim 6 , wherein the biomass is heated under pressure. 
     
     
         8 . The method according to  claim 6 , wherein the biomass is kept hot for several hours. 
     
     
         9 . The method according to  claim 1 , wherein the separated fibres are concentrated on a screening machine and freed from fine material which impedes the milling process after it has been treated in the continuously operated bladed pulper. 
     
     
         10 . The method according to  claim 1 , wherein the separated fibres are milled in a fibrillating manner in the pulper ball mill. 
     
     
         11 . The method according to  claim 1 , wherein the separated fibres are milled in the pulper ball mill with lightweight balls which have approximately the density of plastic. 
     
     
         12 . The method according to  claim 1 , wherein the oversize material of the continuously operated bladed pulper is milled in a second pulper ball mill with heavy balls which have approximately the density of steel, stone or ceramic. 
     
     
         13 . The method according to  claim 1 , wherein a post-sorting process takes place after the fibrillating milling. 
     
     
         14 . A high-consistency pulper having a spiral, wherein the spiral has blades with a cutting edge having a radius of less than 1 mm.