Method for pyrolysis of waste material in the presence of an auxiliary material

A method for thermally decomposing a carbonaceous waste material, comprising:

• filling a reactor defined by a reactor wall with reactor contents comprising said waste material and an auxiliary material, said auxiliary material comprising abrasive particles;
• heating said reactor contents, whereby gaseous products are formed by pyrolysis of said waste material and said particles do not melt or thermally decompose;
• and
• moving said reactor contents with respect to said reactor wall during said pyrolysis, said moving being adapted to mix said reactor contents,
• wherein said auxiliary material further comprises a component adapted to bind halogens present in said gaseous products, said component being integrated with said abrasive particles;
• wherein a brittleness of said abrasive particles is greater than a brittleness of said reactor wall, causing at least a portion of said abrasive particles to break during said moving of said reactor contents;
• wherein said heating said reactor contents occurs in the absence of oxygen;
• and
• wherein said moving said reactor contents occurs by means of a mixing system, said mixing system comprising an agitator comprising a shaft and blades mounted on said shaft, wherein a gap is left between an end of respective blades and said reactor wall, thereby causing said reactor contents to move along said reactor wall, such that abrasive particles being in contact with said reactor wall move over said reactor wall, thereby scraping over at least parts of said reactor wall and loosening waste material that sticks to said reactor wall.