NOVELTY - A biomass gasifier for the pyrolysis or gasification of regenerating raw materials or biogenous waste to the production of combustible product gas, comprises a rotating tube reactor (10) having first and second forehead sides, a heating device arranged outside of the reactor, a biomass feeding pipeline (20), which flows through first opening in the first forehead side into the tube reactor, a waste material discharging pipeline (30), which passes through second opening in the first forehead side into a reaction zone (28) of the reactor, and a gasification agent pipeline.    USE - Used for the pyrolysis or gasification of regenerating raw materials or biogenous waste for the production of combustible product gas.    ADVANTAGE - The biomass gasifier reduces machine expenditure for economical production of the pure product gas with small portion of hydrocarbons and other impurities, so that the product gas is economically usable in combustion engine.    DETAILED DESCRIPTION - The biomass gasifier for pyrolysis or gasification of regenerating raw materials or biogenous waste for the production of combustible product gas, comprises a rotating tube reactor (10) having first and second forehead sides, a heating device arranged outside of the reactor, a biomass feeding pipeline (20), which flows through first opening in the first forehead side into the tube reactor, a waste material discharging pipeline (30), which passes through second opening in the first forehead side into a reaction zone (28) of the reactor, a gasification agent pipeline, which flows into the reaction zone, and a solid material pipeline. The first forehead side of the reactor shows first and second openings while the second forehead side is closed. The tube reactor is rotatable along its longitudinal axis and is arranged in inclined manner in such a way that the closed end of the reactor lies deeper than the open end of the reactor. The waste material-discharging pipeline is gas tightly and rotationally mounted with the reactor in such a manner that the waste material and the product gas are dispensed out of the reactor. A pulling screw is arranged in the waste material-discharging pipeline, which is welded on the second forehead side of the reactor. Catalysts and/or promoters are supplied into the reactor through the solid material pipeline.    An INDEPENDENT CLAIM is included for the operation of the biomass gasifier.    DESCRIPTION OF DRAWING(S) - The figure shows a biomass gasifier:    Rotating tube reactor; (10)    Heating device; (12)    Biomass feeding pipeline; (20)    Reaction zone; (28)    Waste material discharging pipeline. (30)