NOVELTY - A continuous production of charcoal from biomass input material, comprises establishing a charcoal production bed (10) having a biomass upper layer (13) having a top and a charcoal lower layer (15) having a lower layer top, an intermediate layer (14) pyrolysis zone positioned between the upper layer and the lower layer, the charcoal production bed positioned in a single reaction chamber (30); and removing, by removing mechanism (45), charcoal in the lower layer, regulating the introduction of additional biomass material.    USE - The continuous process is for producing charcoal from biomass input material (claimed), fuel gas for combustion engines, and potassium usable as an agricultural fertilizer.    ADVANTAGE - The production of charcoal is maximized; and the consumption of charcoal is minimized. The process is self-sustaining so that it does not require the addition of external heat following initiation of the process.    DETAILED DESCRIPTION - A continuous production of charcoal from biomass input material, comprises:    (a) establishing a charcoal production bed having a biomass upper layer having a top and a charcoal lower layer having a lower layer top, an intermediate layer pyrolysis zone positioned between the upper layer and the lower layer, the charcoal production bed positioned in a single reaction chamber;    (b) igniting the lower layer top with ignition mechanism, establishing a pyrolysis zone at the intermediate layer;    (c) moving oxygen-containing gas downwardly through the charcoal production bed to sustain the pyrolysis reaction in the intermediate layer and to maintain the temperature of the charcoal in the lower layer, where pyrolysis volatiles from the intermediate layer move downwardly through the hot charcoal in the lower layer, resulting in tar-free fuel gas, which exits from the outlet mechanism (43); and    (d) removing, by removing mechanism, charcoal in the lower layer, regulating the introduction of additional biomass material so that as charcoal is removed, the level of charcoal comprising the lower layer, and thus the level of the pyrolysis zone comprising the intermediate layer, remain constant within the reaction chamber.    DESCRIPTION OF DRAWING(S) - The figure is a cross-sectional diagram showing a charcoal production bed in a single reaction chamber.    Charcoal production bed (10)    Biomass upper layer (13)    Intermediate layer (14)    Charcoal lower layer (15)    Single reaction chamber (30)    Outlet mechanism (43)    Removing mechanism (45)