Direct reduction iron cooling device

Abstract

The invention discloses a direct reduction iron cooling device which comprises high-temperature chain scraper conveyors, a first cooling section, a second cooling section and a third cooling section, wherein the first cooling section, the second cooling section and the third cooling section are arranged along the conveying direction and respectively provided with a flowmeter and a valve, and the water volume can be adjusted; and the high-temperature chain scraper conveyors are provided with infrared thermometers and can be adjusted according to a cooling condition. In the invention, two high-temperature chain scraper conveyors are arranged, so that reduction iron and water can be mutually agitated when the high-temperature chain scraper conveyors run, and the reduction iron and the water are more uniformly mixed; the tail parts of the two chain scraper conveyors are both provided with the infrared thermometers, and variable frequency speed regulation is adopted to the chain scraper conveyors; the three cooling sections are all provided with the flowmeters and water volume regulation devices, so that the whole cooling process can be controlled; the bottoms of the chain scraper conveyors are provided with water washing pipes, and when disintegrating slag accumulation appears, the water washing pipes are opened to wash the disintegrating slag into a slag bath for treatment.

Description

technical field [0001] The invention relates to a cooling device, in particular to a direct reduced iron cooling device suitable for the production technology of a rotary hearth furnace in the field of metallurgy. Background technique [0002] Rotary hearth furnace direct reduction, as one of the main technologies for non-blast furnace ironmaking, has attracted widespread attention for its advantages such as simple process and good economy. In this process, iron-containing raw materials are made into carbon-containing pellets, and after drying, they are put into a rotary hearth furnace, and the carbon-containing pellets are reduced to metallized pellets in the reduction zone at 1200-1300 °C in the furnace, and the ZnO in the pellets is reduced to Metal Zn and metal zinc volatilize, enter the flue gas and then oxidize to form ZnO, and then the secondary dust rich in ZnO can be obtained through the collection of flue dust, and the produced metallized pellets can be used in bla...

AI Technical Summary

Problems solved by technology

[0004] At present, there are mainly two cooling methods for direct reduction pellets at home and abroad. First, water cooling: that is, the high-temperature pellets are directly immersed in water for cooling. This method has high cooling intensity and short-term cooling, but the water content of the finished product is high; Second, indirect Cooling: generally in the form of a cooling cylinder, the water and the material are not in direct contact, the cooling intensity is low, the time is long, there is interaction between the pellets, the broken ball rate is about 30%, and the waste rate is high

[0005] With the rapid development of rotary hearth furnace technology, the above cooling technologies can no longer meet the needs of rotary hearth furnaces, and new cooling technologies need to be developed

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