Fixed bed gasifier with rollers

A fixed bed gasifier for generating a producer or synthesis gas of a solid fuel, the fixed bed gasifier comprising:

• a gasifier tank;
• a fuel supply for supplying a solid fuel;
• at least one gasification agent supply for supplying at least one gasification agent that is used to gasify the solid fuel provided in the gasifier tank;
• an outlet for discharging slag and producer and synthesis gas which result from gasification of the solid fuel;
• and
• at least two rollers comprising at least a first roller and a second roller arranged beneath or downstream of the gasifier tank, the at least two rollers each comprising a roller longitudinal axis and configured to counterrotate about the roller longitudinal axis for conveying residues remaining from gasification of the solid fuel out of the fixed bed gasifier,
• each of the at least two rollers having a plurality of circular disk-shaped roller disks connected for rotation with each other;
• the plurality of circular disk-shaped roller disks being divided into roller disks with teeth and plain roller disks without teeth,
• the roller disks with teeth are being arranged alternately with the plain roller disks successively in the roller longitudinal direction;
• and
• the plain roller disks of one of the first roller being opposite to the roller disks with teeth of the second roller, and the roller disks with teeth of the first roller being arranged opposite to the plain roller disks of the second roller.