External thermal coal base vertical furnace for producing direct reduction iron

Abstract

The invention relates to an external thermal coal base vertical furnace for producing direct reduction iron. Cooling chamber walls on the both sides of a cooling chamber are provided with cooling gaschannels in the height direction inward separately, and each cooling gas channel is provided with a plurality of cooling gas outlets or cooling gas inlets; the cooling gas outlets and the cooling gasinlets communicate with the inner space of the cooling chamber; the top of an upper regenerative chamber is provided with a top convergence airway communicating with the top of a combustion chamber, and the bottom of the upper regenerative chamber is provided with an upper regenerative chamber bottom flue; and the top of a lower regenerative chamber is provided with a lower regenerative chamber bottom flue, and the bottom of the lower regenerative chamber is provided with a bottom convergence airway communicating with the bottom of the combustion chamber. According to the vertical furnace provided by the invention, the oxidation reaction of fuel combustion, gasification reaction and reduction reaction of raw materials, cooling process of generated sponge iron, and waste heat recycling process of high temperature flue gas in the direct reduction iron-making process are implemented in the vertical furnace in a centralized way, and the vertical furnace has the characteristics of rationalfurnace structure, long service life, high thermal efficiency, low investment in accessory equipment, easy implementation of engineering, etc.

Description

technical field [0001] The invention relates to the technical field of vertical furnaces, in particular to an externally heated coal-based vertical furnace for producing direct reduced iron. Background technique [0002] The direct reduction ironmaking process (DRI) refers to the process of refining iron ore into metallic iron through reduction in the solid state at a temperature lower than the melting temperature of iron ore, and its product is called sponge iron. Sponge iron is an essential raw material for smelting high-quality special steel. High-quality high-quality special steel products are widely used in power station, metallurgy, petrochemical, aviation and marine equipment fields, and the demand is increasing rapidly. However, the output of direct reduced iron in my country is less than one million tons, less than 1% of the world's direct reduced iron output, far below the world average level. Overproduction of low-end products and insufficient production of high-...

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Problems solved by technology

The above disclosed technologies all have a too simple structure of the furnace body. The shaft furnace only includes the oxidation reaction of fuel combustion, the gasification reaction of raw materials and the reduction reaction of raw materials. The life of the furnace body is short, the thermal efficiency is low, and it is difficult to engineer. Moreover, they all adopt the cooling method of cooling the high-temperature sponge iron outside the furnace with water-cooled equipment, which requires high temperature resistance for the discharge equipment and water-cooled equipment, and requires a large investment in equipment.

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