Method and device for preparing formed sludge fuel

The invention discloses a process method for preparing a derived solid fuel by using sludge, and the method comprises the following steps: feeding dehydrated wet sludge with the moisture content of 70-85% and biomass at a weight ratio of 50:(1-10) into a tempering kettle, introducing less water, evenly stirring, adding a tempering agent the mass of which is 0-20% of that of dried solid sludge, stirring for 2-10 minutes continuously, removing most of water by a dehydrator, forming, and naturally drying for 24 hours, thus obtaining the derived sludge solid fuel. The invention also discloses a device for preparing a formed sludge fuel. The device comprises a straw crusher, a feeder, the tempering kettle, the stirrer, the fuel hydrator and a fuel forming machine, wherein the stirrer is positioned at the top of the tempering kettle, a stirring shaft is coincident with the axis of the tempering kettle and inserted into the tempering kettle, the outlet of the straw crusher is connected with the inlet of the feeder, the outlet of the feeder is connected with the inlet of the tempering kettle, the outlet of the tempering kettle is connected with the inlet of the fuel dehydrator, and the outlet of the fuel dehydrator is connected with the inlet of the fuel forming machine.