Tubular and blast furnace

Abstract

A vent 1 is provided for blowing hot air into a furnace. It is characterized by having a cylindrical portion (6), a front end portion (2), and a rear end portion (3). The cylindrical portion (6) has an inner cylindrical wall portion (7), an outer cylindrical wall portion (8), and partition wall portions (9, 10). The inner cylindrical wall portion (7), the outer cylindrical wall portion (8), and the partition wall portions (9, 10) divide the space into a plurality of spaces, including a first space and a second space independent of the first space. The inner cylindrical wall portion (7) is located near the center of the furnace. The side of the shaft is the inner surface (7A). The first space is the inner refrigerant flow path (41, 42) for circulating refrigerant. The second space is the inner reducing agent flow path (50) for circulating reducing agent. The inlet and outlet of the inner refrigerant flow path (41, 42) are located at the rear end (3). The supply port of the inner reducing agent flow path (50) is located at the rear end (3). The outlet (50S) of the inner reducing agent flow path (50) is located on the inner surface (7A) or the front end (2).

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