Patent ID: 8603202

Claim:
A device for producing a product gas from biomass, comprising a reactor which is delimited by a base part and reactor walls, which reactor walls comprise a circumferential wall and an upper wall, which reactor comprises: a supply opening disposed in the base part for the supplying of biomass to the reactor; at least one riser in fluid communication with the supply opening for the chemical conversion of supplied biomass from the supply opening to at least a product gas, which riser is attached within the circumferential wall and comprises an upper end and a lower end; and a discharge opening disposed in the upper wall and in fluid communication with the at least one riser for the discharging of the product gas from the riser, wherein the riser is fastened to at least one reactor wall and the base part of the reactor has a through-opening through which the lower end of the riser movably extends, wherein the through-opening has a diameter larger than a diameter of the riser and the lower end of the riser protrudes freely through the through-opening such that a clearance is formed between the riser and the base part to facilitate free expansion of the riser, and wherein the riser is not fastened to the base part and is able to expand freely at the lower end thereof.