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

Abstract

The invention belongs to metallurgical chemistry technology, in particular to a method for producing sponge iron by a dry coal powder gasification shaft furnace. Primary reduction gas is produced from dry coal powder which is crushed and dried in a coal pulverizer and oxygen by a gasification furnace. The produced primary reduction gas is cooled, removed dust, desulfurized and reheated. After thepressure of the primary reduction gas is reduced by turbine expansion power generation, the primary reduction gas is sent to a heating section to obtain reduction gas after being heated by a partial oxidation process. 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. Then, coal gas from the shaft furnace is washed and then is output to a coal gas pipe net, or the coal gas is reheated and then put into the shaft furnace. The invention not only overcomes the limitation of manufacturing gas by natural gas in a gas-based method, but also can form mass production. The invention produces the sponge iron from the coal power of non-coking coal, realizes low-energy consumption production and achieves the target of reducing the emission of CO2. 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 method 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. The output of sponge iron and sponge iron hot briquetting in the world is close to 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-...

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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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