Production process for producing spongy iron by dry coal powder gasification high furnace

Abstract

The invention belongs to metallurgical chemistry technology, in particular to a technology for producing sponge iron by a dry coal powder gasification shaft furnace. Primary reduction gas is produced from dry coal powder and oxygen by a gasification furnace and desulfurization and slag-tap are carried out inside the gasification furnace. The primary reduction gas is cooled, removed dust in a dry way and heated. A part of synthetic gas is sent to the coal powder gasification furnace after wet desulfurization and pressurization, and the other part of the primary reduction gas is sent to a heating section. The primary reduction gas is heated by a partial oxidation process to obtain reduction gas. The reduction gas, lump ore and pellet ore are put into an input shaft furnace respectively. The lump ore and the pellet ore are reduced into the sponge iron in the shaft furnace. Coal gas from the shaft furnace is washed and then pressure energy is recycled by TRT. The invention can produce the sponge iron from the coal power of non-coking coal in the shaft furnace. The invention realizes low-energy consumption production and clean production and causes no dirt of hydroxybenzene and cyanide and the pollution during coking and sintering processes. Shaft furnace coal gas can be used for manufacturing chemical products and CCPP power generation. The invention provides chance for steel-chemical industry and steel-power generation combined enterprises.

Description

technical field [0001] The invention belongs to the category of metallurgical chemistry technology, in particular to a production process for producing sponge iron in a dry coal pulverized gasification shaft furnace. Background technique [0002] Sponge iron is a good source of iron, an indispensable impurity diluent for electric furnace smelting of pure steel and high-quality steel, and the best coolant for converter steelmaking. 60 million t / a. Most of the world's sponge iron is produced by gas-based shaft furnaces, and a small amount is also produced by rotary kilns directly using coal. There are two mainstream methods of shaft furnace production: Midrex and HYL. From the perspective of production capacity, the total production capacity of Midrex is much higher than that of HYL method, but Midrex is an atmospheric shaft furnace with a reduction pressure of about 0.1MPa, which is not suitable for high-pressure gas matching furnace. The reduction pressure of the HYL meth...

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Problems solved by technology

There is no large-scale production facility for the production of sponge iron in domestic shaft furnaces, and there have been reports of developing sponge iron production with coke oven gas. Because coke oven gas is also very valuable in iron and steel plants, it is impossible to form a climate for large-scale production.

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