Cooling chamber of external heating coal base upright furnace for producing direct reduction iron

Abstract

The invention relates to a cooling chamber of an external heating coal base upright furnace for producing direct reduction iron. Cooling gas channels are respectively formed in cooling chamber walls on two sides of a cooling chamber; multiple cooling gas channels are uniformly arranged in the height direction of the cooling chamber; each cooling gas channel is uniformly provided with multiple cooling gas inlets in the length direction of the cooling chamber; the cooling gas inlets communicate with internal space of the cooling chamber, and opening directions are all towards the inclined lowerside of the inner side of the cooling chamber; an upper port of the cooling chamber is a cooling gas outlet; and each cooling gas channel communicates with furnace feeding gas pipes or inertia gas pipes. High-temperature sponge iron directly exchanges heat with gas in the cooling chamber for cooling, which cooperates with indirect heat exchange cooling of a furnace external water cooling device, so that the heat exchange efficiency in the cooling process can be improved, the reaction speed of the reduction reaction can be accelerated through increasing the reduction atmosphere concentration ina reduction chamber, and meanwhile, the high-temperature resisting requirements on a furnace external discharge device and the water cooling device can be reduced.

Description

technical field [0001] The invention relates to the technical field of vertical furnaces, in particular to a cooling chamber of an externally heated coal-based vertical furnace for producing direct reduced iron. Background technique [0002] In order to adapt to the ever-increasing environmental protection requirements, to reduce the energy consumption of steel production, optimize the industrial structure, improve product quality and quality, and seek ways to solve the shortage of steel scrap, the direct reduction ironmaking process (DRI) has been paid more and more attention. The research on reduction ironmaking process is developing vigorously. Direct reduction ironmaking is divided into gas-based direct reduction and coal-based direct reduction according to the process. The lack of natural gas resources in my country, but the characteristics of rich coal resources determine that coal-based direct reduction technology is the first choice for the development of direct redu...

AI Technical Summary

Problems solved by technology

Tunnel kiln technology, rotary kiln technology and rotary hearth furnace technology all have shortcomings such as low output, high energy consumption, large iron and coal consumption per ton, and poor economic benefits, making it difficult to obtain large-scale application and development

The coal-based shaft furnace process is represented by the KM process in Italy. In the shaft furnace, the oxidation reaction of fuel combustion, the gasification reaction of raw materials and the reduction reaction of raw materials occur. The high-temperature sponge iron produced is cooled by water-cooling equipment outside the furnace. Since the temperature of the generated high-temperature sponge iron is between 800°C and 1050°C, the high temperature resistance requirements for discharge equipment and water cooling equipment are high, and the investment in equipment is huge. The former Ministry of Metallurgy once organized some domestic units to study and test the KM process, but because of Failure to implement due to reasons such as high investment costs

[0004] The Chinese patent application number 201611050878.1 discloses "a coal-based shaft furnace direct reduction process", which records that "after the reduction is completed, the mixture is cooled to a hot discharge temperature of 500-850°C or a cold discharge temperature of 50°C through the cooling section. After -150°C, it is discharged out of the furnace through the discharge device of the coal-based shaft furnace; "However, there is no detailed record on how to achieve the cooling of the charge

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