A reduction kiln tailings coal preheating device

Abstract

The invention discloses a tailing preheating device of a reduction kiln. The tailing preheating device comprises a preheating chamber (1), a smoke collection chamber (2) and a smoke extractor (3). The preheating chamber (1) is arranged on an outlet side of a preheating segment of a chain grate (4); space for containing kiln tailing is arranged inside the preheating chamber (1), a smoke inlet is formed in the front side of the preheating chamber (1), a smoke outlet is formed in the rear side of the preheating chamber (1), and the discharging end at the bottom of the preheating chamber (1) is located above a grid plate of the chain grate (4) and provided with a kiln tailing discharging device; the smoke collection chamber (2) is located on the rear side of the preheating chamber (1) and is communicated with the preheating chamber (1) through the smoke outlet; the smoke extractor (3) is arranged outside the smoke collection chamber (2) and used for extracting smoke in the smoke collection chamber (2). According to the preheating device, the kiln tailing preheating chamber is arranged on the preheating segment of the chain grate, and part of high-temperature smoke discharged by the tail of a reduction kiln is utilized for heating the kiln tailing; a heating device does not need to be additionally arranged, and energy can be effectively saved; running cost is reduced, and the device is compact in structure and reasonable in layout; and a utilization coefficient of kiln capacity is improved.

Description

technical field [0001] The invention relates to the technical field of smelting equipment, in particular to a preheating device for raising the temperature of tailing coal entering a reduction kiln. Background technique [0002] The direct reduction method in non-blast furnace ironmaking refers to the ironmaking process in which iron ore is reduced to sponge iron below the melting temperature. The product is direct reduced iron (DRI), also known as sponge iron. Sponge iron has not been melted, and still maintains the shape of the ore. Due to the reduction and loss of oxygen, a large number of pores are formed. It is named after the shape of the sponge under the microscope. It is characterized by low carbon content (<1%) and preserves the gangue in the ore. . [0003] The direct reduction method is divided into two categories: gas-based method and coal-based method. The former uses natural gas cracked to produce H2 and CO gas as reducing agents, and oxidizes iron ore in s...

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Problems solved by technology

However, this will consume extra fuel, and the operating cost will be higher, and if the structural design is unreasonable, the equipment will be very complicated

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