Internal and external heating vertical passway reduction furnace

The utility model relates to an internal and external heating vertical passway reduction furnace with materials continuously circulating from top to bottom inside the reduction furnace, which comprises a preheating area and a heating reduction area, wherein, the preheating area of the reduction furnace needs to be provided with an array of burner tips, while the heating reduction area with 3 to 4 arrays of burner tips; the reduction furnace is arranged with 2 to 6 vertical retorts along horizontal direction and 4 to 100 arrays of retorts along longitudinal direction; between every two retorts is disposed with a set of burner tips for heating the circumference of the retorts; the bottom of each retort is designed with an internal burner tip; the inferior outlets of all retorts inside the reduction furnace are arranged with insulation layer; in addition, each reduction furnace is only provided with one unified laying off mouth. The utility model is characterized in that: it adopts superincumbent material circulating mode and internal and external heating mode; double-layer SiC retort internal and external heating mode increases material heating rate, thereby improving heat utilization efficiency and reducing reduction process time; compact SiC retort ensures conditions for reduction course, while porous SiC makes reaction gas drain into the reduction furnace for combustion.