METHOD FOR PRODUCING CHARCOAL Russian patent published in 1997 - IPC

FIELD: charcoal production. SUBSTANCE: multiple recycling of gas-vapor mixture and hot smoke fumes in the process of drying and heat decomposition of pyrolysis raw material is followed by cooling product in the same chamber by way of passing atmosphere air between housing and walls of chamber. Hot smoke fumes entering chamber 2 from hearth 15 along with moisture evaporated from pyrolysis raw material in drying process and heat decomposition at 200-400 C are recycled. Gas-vapor mixture from chamber 2 is taken off by smoke extractor 10 through connection pipes 11 and returned into it through connection pipes 12. Excess smoke fumes and gas-vapor mixture are removed through smoke flues 4. Once pyrolysis is started, smoke extractor is switched off. Charcoal is cooled by fan 6 charging atmosphere air through air duct 5 confined with housing 3 and walls 1. EFFECT: accelerated process. 2 cl, 3 dwg