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Energy-saving preheating pipeline

An energy-saving preheating pipeline comprises an air tube, and also comprises a preheating tube and a U-shaped sleeve, wherein one end of the U-shaped sleeve covers the preheating tube, the bottom of the U-shaped sleeve is provided with a sealing end, the upper end of the preheating tube is sealed, the lower end of the preheating tube is sealed so as to be fixedly connected at the bottom of the sealing end, an air discharge tube arranged at the side of the bottom penetrates through the sealing end, the air tube penetrates through the bottom of the sealing end so as to be inserted in the preheating pipe, the sealing end is provided with a smoke outlet, the other end of the U-shaped sleeve is provided with a smoke inlet, the diameter of the smoke outlet is smaller than that of the smoke inlet, and the sealing end and one end of the U-shaped sleeve are connected through a flange structure. The energy-saving preheating pipeline has a simple structure, is easy to realize, and utilizes the waste heat of smoke to heat air transmitted by the air tube through the preheating tube and supplies the heated air to a furnace, so that the combustion efficiency is higher, the use ratio of the furnace is improved, and the consumption and the cost are lowered.