Feeder and method for feeding raw material comprising plastic

A feeder for feeding raw material which comprises plastic to a gasification or pyrolysis, wherein

• the feeder is integrated with a gasifier of the gasification or a pyrolysis reactor of the pyrolysis in which the gasification or the pyrolysis is carried out by steam and the plastic containing raw material is converted into products, and the feeder is arranged to feed the plastic containing raw material into a fluidized bed of the gasifier or pyrolysis reactor,
• the feeder comprises a screw feeder part and a pneumatic feeder part arranged after the screw feeder part, in which the screw feeder part and pneumatic feeder part form a combined feeder for feeding the plastic containing raw material which is in a solid form,
• the screw feeder part comprises at least a screw to transfer the plastic containing raw material to the pneumatic feeder part and at least one cooling device to cool the plastic containing raw material to below melting temperature in the screw feeder part,
• the pneumatic feeder part arranged after the screw feeder part, comprises at least one inlet to supply a pneumatic carrier material which is steam to the plastic containing raw material in the pneumatic feeder part for forming a mixture of the plastic containing raw material and the pneumatic carrier material, wherein a pressure of the steam in the feeder is 1-5 bar higher than a pressure in the gasifier or pyrolysis reactor, and
• the feeder comprises at least one gas lock to prevent a steam flow in the opposite direction.