(AT508001-A4)   NOVELTY - The reactor (1) has a container (3) for defining a gasification chamber (4) with an oxidation zone (5), where oxygen like gasification agent (8) i.e. air, is supplied to the zone from outside of the container. Biomass (2) is conveyed to the zone in the chamber, and air supply elements (6) with outlet openings (7) are arranged in an area of the zone in the container. The air supply elements extend in a conveying direction (10) of the biomass and formed like lances. The air supply elements are provided with an external insulation layer (12) along an insulation section (11).    USE - Reactor for gasifying biomass to produce gas e.g. raw gas, combustion gas and weak gas, of a direct current gas generator.    ADVANTAGE - The air supply elements are formed like lances and provided with the external insulation layer along the insulation section, thus protecting the air supply elements against thermal loadings, and using the insulation section as a heat storage, and hence providing large space for outputting heat of the reactor. The protection of the air supply elements against thermal loadings reduces wear of the air supply elements, thus ensuring optimal operation of the reactor.    DETAILED DESCRIPTION - The reactor (1) comprises a reaction container (3), which defines a gasification chamber (4) with an oxidization zone (5), where an oxygen-containing gasification agent such as air is supplied to the oxidization zone from outside of the reaction container and biomass (2) is continuously conveyed to the oxidization zone in the gasification chamber. The reaction container is equipped with air supply elements (6) comprising outlet openings in the region of the oxidization zone, where the air supply elements extend in the direction of conveyance of the biomass. Each of the air supply elements is designed in a lance-shaped manner and is provided with an outer insulation layer along an insulation section. The air supply elements are group-wisely provided with the common insulation layer along the insulation section, are distributedly arranged over the cross-section of the gasification chamber in a circular manner, and are connected mutually or group-wisely with a supply line. The reactor has a device for tempering the gasification agent. A section of the reactor wall and/or from built-in in the oxidation zone and/or a section situated above the outlet openings of the air supply elements are temperable. The section of the reactor wall and/or from built-in above the oxidation zone of the gasification chamber is heatable. The reactor includes heat storage elements arranged in the section of the reactor wall and/or from built-in in the oxidation zone. A sensor is provided above the oxidation zone for monitoring the temperature. A further sensor is provided at the exit of the tempering medium for monitoring the temperature. A control unit that is based on the signals of the sensors for temperature monitoring controls the tempering device, the tempering of a heat exchanger of the air supply elements, the tempering sections of the reactor wall and/or from built-in within the gasification chamber above the oxidation zone, the ratio between the supplied gasification agent and the supply air and/or the supply of the vapor. A distribution device for the biomass comprises a container with an opening eccentrically located at its lower section, where the container is mountably, rotatably and movably arranged in the gasification chamber at a driving shaft. The driving shaft of the container is implemented in the gasification chamber vertically standing from outside of the reactor container, and is coupled with an own drive with respect to the movement. A stirrer is arranged to the distribution device at the lower side of the container.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic side sectional view of a reactor for gasifying biomass.    Reactor (1)    Biomass (2)    Container (3)    Gasification chamber (4)    Oxidation zone (5)    Air supply elements (6)    Outlet openings (7)    Gasification agent (8)    Conveying direction (10)    Insulation section (11)    External insulation layer (12)