NOVELTY - The thermo-chemical gasification reactor for the gasification of solid fuels, comprises a bed (35) and a thermo-chemical reaction pipe (34) features having a gap through which the synthesized fuel gas, ash and particles are removed from the reaction pipe. The relative position between the thermo-chemical reaction pipe and the bed is varied in a way that the gap width increases or decreases to manipulate the operation mode of the thermo-chemical gasification reaction and to release a specific amount of solid material from the gasification pipe into the bottom of the reactor housing.    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, maintains optimized gasification efficiency with regard to required power output and specific properties of the input material, and enables the automatic removal of the 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 for the gasification of solid fuels, comprises a bed (35) and a thermo-chemical reaction pipe (34) features having a gap through which the synthesized fuel gas, ash and particles are removed from the reaction pipe. The relative position between the thermo-chemical reaction pipe and the bed is varied in a way that the gap width increases or decreases to manipulate the operation mode of the thermo-chemical gasification reaction and to release a specific amount of solid material from the gasification pipe into the bottom of the reactor housing. A physical connection device is configured for connecting the bottom of the reactor housing with a cleaning device acting as a separator between the produced fuel gas and the solid matters, which are carried with the fuel gas in a two phase flow. The cleaning device is a cyclone with a bottom-attached gas-tight material sluice. The bottom of the reactor, the connection device and the attached cleaning device are designed: in a way that the raw fuel gas flowing from the reactor through the connection device into the cleaning device results in a flow current characteristic inside the cleaning device for allowing physical separation of carried particles from the gaseous fuel in a cyclone specific selectivity with minimum disturbance; and in a way that the bottom and the outlet of the reactor housing, the connecting device and the cleaning device inlet are located in a horizontal line ( alpha +0) or a non-horizontal line from a declining angle ( alpha less than 0) or an increasing angle ( alpha greater than 0). The design optimized bottom and outlet of the reactor housing, the design optimized connecting device, and the cleaning device accumulate the released solid matter from the thermo-chemical reaction pipe at the bottom of the apparatus in a way that it is removed into the cleaning device by the gas flow and the mechanical actuation of an integrated solid matter removal device such as a screw conveyor or an oscillating push device. The solid matter removal device is continuously or discontinuously operated, and actuated from an external actuator for pulling back to the side wall of the reactor bottom and for pushing forward the solid matter through the connecting device into the cleaning device. The material is a liquid matter from molten slag. An INDEPENDENT CLAIM is included for a method to operate a matter cleaning device for the removal of solid or liquid matter from the bottom of the reactor through the connection device into the cleaning device to remove solid or liquid material during normal operation mode of the reactor.    DESCRIPTION OF DRAWING(S) - The diagram shows a cut away side view of a thermo-chemical gasification reactor.    Thermo-chemical reaction pipe (34)    Upper part of the reactor (31)    Lower part of the reactor (34)    Bed (35)    Blade disc (39)    Push rod. (44)