Methods, devices and systems for continuously converting biomass are described herein. A device has a feed section for holding a moving bed of biomass, namely wood, having a drying section, a flame zone for degassing, and a, smolder zone for carbonizing the biomass into a solid converted product, namely charcoal. The device includes a tank for collecting the solid converted product arranged below a grate and coupled with the feed section in a gas-tight manner. The system comprising the device, a biogas plant and/or a combined heat and power plant conveys the liquid converted product, namely pyroligneous acid or acetic acid, to the biogas plant and/or the solid converted product, namely charcoal, to the combined heat and power plant.