NOVELTY - The thermo-chemical gasification reactor comprises a ring gap (33) with the height (h) in a thermo-chemical reaction pipe to divide the thermo-chemical reaction pipe into an upper section (31) and a lower section (34) of the reactor. The upper section is the colder section, where the solid fuel is supplied into the gasification reactor but the thermo-chemical reaction is not supposed to occur. The oxidant for the gasification process is delivered into the reactor through the ring gap. Blade-like finger elements are ring-like arranged around and in the ring gap by a carrier device.    USE - The thermo-chemical gasification reactor is useful for the gasification of solid fuels such as bio fuels from wood and other sources to supply the fuel gas to a combustion engine for its regular operation.    ADVANTAGE - The thermo-chemical gasification reactor has improved design and operation and self-cleaning features, is reliable, durable and economical to operate, provides high dynamic property for the gasification process in an efficient and environment-friendly manner by uniformly heating and distributing the material, maintains the optimized gasification efficiency with regard to required power output and specific properties of the input material, and enables the automatic removal of any released material from the bottom of the reactor thus preventing the gasification reactor from stopping or plugging when the contaminated fuel is used.    DETAILED DESCRIPTION - The thermo-chemical gasification reactor comprises a ring gap (33) with the height (h) in a thermo-chemical reaction pipe to divide the thermo-chemical reaction pipe into an upper section (31) and a lower section (34) of the reactor. The upper section is the colder section, where the solid fuel is supplied into the gasification reactor but the thermo-chemical reaction is not supposed to occur. The oxidant for the gasification process is delivered into the reactor through the ring gap. Blade-like finger elements are ring-like arranged around and in the ring gap by a carrier device. The number of blade-like finger elements is 1-50. The design of the blade-like finger elements in the ring gap is symmetric, periodic or arbitrary. The blade-like finger elements extend beyond the inner diameter of the ring gap and reach to the outer diameter of the ring gap. The specific claw-like bent geometry of the stir fingers is suited to remove all foreign material from the ring gap into the thermo-chemical gasification pipe and to clean the gap from slag and plugging. The ring gap has a flat mid-plane, which is geometrically perpendicular to the center axis of the gasification reactor ( beta =90 degrees ) and to the flow direction of the solid fuel material through the gasification reactor. The ring gap has: a cone shape mid-plane, which is geometrically arranged to the center axis of the gasification reactor in an angle ( alpha ) of 1-89 degrees , where the cone is reduced with the flow direction of the solid fuel material through the gasification reactor; or a cone shape mid-plane, which is geometrically arranged to the center axis of the gasification reactor in an angle of 1-89 degrees , where the cone is increased with the flow direction of the solid fuel material through the reactor. The thermo-chemical gasification reactor is a downstream reactor, an upstream reactor or a horizontal tilted reactor. The carrier device is physically connected to a first hollow shaft to rotate the blade-like finger elements inside the ring gap in an arbitrary movement, oscillating movement or rotation. The reactor has a design optimized to clean the ring gap from residues, plugging and the intruded material and to homogenize and optimize air delivery respectively oxidant delivery through the ring gap into the thermo-chemical reactor. The shaft is introduced into the reactor from the bottom or upper top side. The additional stir fingers are attached to this shaft. A second shaft is fed through the first hollow shaft, is connected to a bed plate (35) of the reactor, and rotates independently from the hollow shaft. The additional stir fingers are further attached to the second shaft. The bed plate attached to the shaft is a conical shape. The contact surface between the bed plate and the lower section of the reactor has a three-dimensional complex relief, which enhances the gas flow but restricts the material flow through the gap. The second shaft is moved vertically to manipulate the gap between the counter surfaces of bed plate and the lower section of the reactor. The vertical movement of the bed plate and the stir fingers move into a lower position for creating a large gap to enable prompt emptying of the thermo-chemical reaction pipe as the enclosed solid fuel material is released into the volume below the reaction pipe and the bed plate. The upper and lower parts of the thermo-chemical reaction pipe are heated electrically and located in independent vertical zones. The maximum heating temperature is up to 1800 degrees C. The number of independent heating zones is 1-50. INDEPENDENT CLAIMS are included for:    (1) a method to vary and manipulate the relative height between the conical shaped counter surface of lower section of the reactor and the bed plate by an actuator;    (2) a method to control the temperature of the different heating zones of the thermo-chemical gasification reactor;    (3) a method to control the flow rate of the reaction gas flow by the thermo-chemical gasification reactor; and    (4) a method to control the rotational movement of the blade-like finger elements.    DESCRIPTION OF DRAWING(S) - The diagram shows a cut-away side view of a thermo-chemical gasification reactor.    Upper section (31)    Ring gap (33)    Lower section (34)    Bed plate (35)    Gap. (37)