NOVELTY - A heating gas (K) generated by burning a fossil fuel (H) is blown off by a hot air blaster (24) into heating tubes (29) formed around a rotary drum (26) from the downstream side towards the upstream side. Two fans (44,21) are used to pass part (K1) of heating gas ejected from the upstream side of the drum into the drum from the upstream side and recirculate the remainder.    USE - For performing dry distillation thermolysis of a waste material, e.g. a municipal solid waste.    ADVANTAGE - The calories of heat input to the rotary drum which performs the thermolysis of waste material with heating gas can be reduced by passing a portion of heating gas ejected from the upstream side of the drum into the drum from the upstream side while recirculating the remainder when circulating the heating gas from the downstream side towards the upstream side through the heating tubes set inside the drum. The waste gas heat loss can be made zero approximately with a good practical effect by performing direct drying of the waste material with the portion of heating gas reintroduced into the upstream side of the drum while performing an indirect heating with the heating gas being recirculated.    DETAILED DESCRIPTION - The heating tubes are arranged in the axial direction inside the drum to perform dry distillation thermolysis of waste material (C) introduced into the drum from the upstream side by a screw conveyor (1). The thermolysis gas (G) and thermolysis residue (D) generated by the thermolysis of waste material are collected from the downstream side of the drum by an extraction device (3).    An INDEPENDENT CLAIM is also included for a dry distillation thermolysis method for waste material.    DESCRIPTION OF DRAWING(S) - The figure shows a longitudinal cross-sectional view of the dry distillation thermolysis reactor.    Screw conveyor (1)    Dry distillation thermolysis reactor (2)    Taking out device (3)    Fans (21,44)    Hot air blaster (24)    Drum (26)    Heating tube (29)    Fossil fuel (H)    Heating gas (K)    A part of heating gas (K1)    Waste material (C)    Thermolysis residue (D)    Thermolysis gas (G)