The invention relates to a method for adjusting the fill level in a gasifier for carbonaceous material in the form of a fluidized bed reactor (300) in which biomass and / or coke (K) is converted into a product gas (403), the method comprising the following steps. Providing a substantially conical, downwardly tapering, fluidized bed reactor (300), with an upper reactor ceiling (302) and a lower inlet opening (301) into the biomass and / or coke (K) from below and a gaseous gasification agent (V) upward is introduced into the fluidized bed reactor (300), so that within the conical reactor (300) a, lifted from the location of the inlet opening, suspended fixed bed (402) is formed, wherein the flow rate of the gaseous gasification agent (401) together with the biomass and / or the coke (K) is adapted to the shape of the flow cross-section of the conical reactor (300), taking into account the material properties of the biomass and / or the coke, so that a stable bed is formed in the reactor (300) that is kept in suspension. The height of an upper boundary layer of the fixed bed within the reactor (300) is set by sucking off gas together with particles through a suction pipe (303) protruding downward into the reactor ceiling (302), the position of the suction pipe (303 ) determines the vertical position of the upper boundary layer of the floating bed.
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