Second row spacing of the new cupola with a large and stable furnace conditions, water temperatures are high, and the burning hot metal quality and few advantages. Suitable for production of body parts, auto parts, urban construction pipes, fasteners, ball and other cast iron products. Using the latest design, in line with the "three" of the standard distance between two rows of large cupola, is currently widely used as a foundry cupola, the main structural features as having two air vents, exhaust from the larger end of the formation of coke combustion two separate combustion zone, by stretching out the overheated zone, increasing the heat away from hot metal and the end of the intense combustion of coke, furnace condition stable, high temperature, hot metal, hot metal quality. In accordance with the supply air temperature into the cold wind, hot air furnace two structures, through the adoption of different temperature air to achieve different melting requirements. Furnace using hot air furnace heat exchanger ribs close to the physical gas furnace heating cold air into the furnace, hot air temperature of 180-250 ℃, so it has not accounted for plant production area, compact structure, easy operation and the thermal inertia and small characteristics. Reasonable structural parameters, you better bring a comprehensive economic and technical effects.