The furnace takes full advantages of CO, methane, hydrogen and other flammable gas produced during the carbonization process and adopts the high technique of gas recovery, purification and recirculating combustion. It not only solves the air pollution caused by th heavy smoke during carbonization, but also supplies the heat energy needed by the production. Such design makes the self-sufficiency real, meanwhile, improves the continuity and economical efficienry to make full use of...