NOVELTY - A sludge fuel formation apparatus comprises drying furnace (3) which heats and dry processes water containing sludge with vapor, thermal decomposition carbonization furnace (6) which produces pyrolysis gas and carbonized material, combustion furnace (7) which burns pyrolysis gas emitted in thermal decomposition carbonization furnace, exhaust heat recovery boiler (8), combustion exhaust gas lines (14a,14b,14c) and hot air circulation line which forms combustion exhaust gas after utilization as heat source of exhaust heat recovery boiler with third combustion exhaust gas line is installed.    USE - Sludge fuel formation apparatus.    ADVANTAGE - The apparatus reduces usage amount of fossil fuel and running cost, and makes installation area of processing facility small.    DETAILED DESCRIPTION - A sludge fuel formation apparatus comprises drying furnace (3) which heats and dry processes water containing sludge with vapor and removes moisture content in sludge, thermal decomposition carbonization furnace (6) which carries out thermal decomposition carbonization process of sludge and produces pyrolysis gas and carbonized material, combustion furnace (7) which burns pyrolysis gas emitted in thermal decomposition carbonization furnace, exhaust heat recovery boiler (8) which makes heat source combustion exhaust gas emitted with combustion furnace, first combustion exhaust gas line (14a,14b,14c) that sends combustion exhaustion gas to thermal decomposition carbonization furnace from combustion furnace, second combustion exhaust gas line which sends combustion exhaust gas to waste heat boiler from thermal decomposition carbonization furnace and hot air circulation line which forms combustion exhaust gas after utilization as heat source of exhaust heat recovery boiler with third combustion exhaust gas line is installed. The amount of circulated air of waste gas hot air for heating of thermal decomposition carbonization furnace is raised.    DESCRIPTION OF DRAWING(S) - The drawing shows a conceptual flowchart of the fuel formation apparatus of sludge. (Drawing includes non-English language text).    Drying furnace (3)    Thermal decomposition carbonization furnace (6)    Combustion furnace (7)    Exhaust heat recovery boiler (8)    Combustion exhaust gas lines (14a,14b,14c)