NOVELTY - A refuse-derived solid fuel producing apparatus comprises a forming body (10) with a hopper (10a) and a drive unit (11); a force-feed pipe (30) containing a force-feed screw (50); a siphon (70) in a space (51) defined in the screw; and rod-type heaters (90). The force-feed pipe is a cylindrical double pipe with a space (33) between layers forming a double pipe, and an oil feed pipe (35) and an oil discharge pipe (37) at opposite ends of the force-feed pipe respectively.    USE - Used for producing a refuse-derived solid fuel by pressing and drying combustible waste (claimed).    ADVANTAGE - In the apparatus, the combustible waste that passes through the force-feed pipe, is dried by the thermal oil circulating in the space defined between the layers constituting the force-feed pipe. In addition, the interior of the combustible waste is dried by thermal oil which is circulated by the force-feed screw. As a result, the combustible waste is dried, such that the water content in the combustible waste satisfies the reference value of 7-8%. Therefore, the produced refuse-derived solid fuel, is not fragile. In addition, when the refuse-derived solid fuel is burned, the amount of dioxin discharged is minimized. The heaters mounted to the force-feed pipe, have rod shapes, hence when some problem occurs in the heaters, partial replacement of the heaters is possible.    DETAILED DESCRIPTION - A thermal oil flows in the space defined between the layers constituting the cylindrical double pipe, for heating the compressed waste fed in the force-feed pipe by rotating the force-feed screw, to evaporate water contained in the compressed waste. The thermal oil is supplied from an oil feed unit into the siphon to heat the force-feed screw, for drying the compressed waste force-fed through the force-feed pipe to evaporate water contained in the compressed waste. The rod-type heaters are provided at one end of the force-feed pipe, for heating an outer surface of the compressed waste fed from the force-feed pipe, to smooth the outer surface of compressed waste. The oil feed unit comprises a rotary joint (110).    DESCRIPTION OF DRAWING(S) - The figure shows a sectional view of an apparatus for producing a refuse-derived solid fuel.    forming body (10)    hopper (10a)    drive unit (11)    force-feed pipe (30)    double pipe space (33)    oil feed pipe (35)    oil discharge pipe (37)    force-feed screw (50)    force-feed screw space (51)    siphon (70)    rod-type heaters (90)    rotary joint (110)