Mixed reduction ironmaking equipment and ironmaking method

Abstract

The invention discloses mixing reduction iron-making equipment and an iron-making method. The iron-making method comprises the following steps that raw materials, namely powdered ore, powdered coal, a fusing agent and the like, are placed into a stock bin, the raw materials are heated by flue gas inside a chimney in the stock bin, and the raw materials are fed to a feed pipe through a universal distributor and then flow into a rotary kiln; a drive motor drives the rotary kiln and a roller grate to rotate so that the raw materials which flow into the rotary kiln and the roller grate are further heated by flowing hot gas; a part of powdered coal and powdered ore generate chemical reaction to generate ferrous oxide and carbon dioxide; a fuel oil flame ignites coal dust positioned on the rear middle section of the roller grate; clinker aggregate taken out of the roller grate falls to a comb grate positioned in a mixing reduction furnace and is further heated and reduced by a powdered coal flame sprayed by using enriched oxygen, small clinker aggregate falls into an iron bath reduction pool and is reduced by carburized and blown water gas, large clinker aggregate slides to a slow reduction pool and is heated and reduced by coke which is supported by the enriched oxygen to be combusted; molten iron and slag which are generated in the iron bath reduction pool flow into the slow reduction pool and flow out of a molten iron outlet and a slag pipe.

Description

Technical field: [0001] The invention relates to a mixed reduction ironmaking equipment and an ironmaking method. Background technique: [0002] At present, there are three kinds of smelting reduction ironmaking technologies that have been used in production in the world: COREX, FINEX and HLSMELT. The 3,000-ton COREX ironmaking equipment introduced by Shanghai Baosteel in my country a few years ago was installed in Shanghai Luojing Branch Plant. Although it is environmentally friendly, it consumes coal. It is twice as big as blast furnace ironmaking. It has been running for several years and has been losing money every year. At present, the 3,000-ton COREX ironmaking equipment has been transferred to the coal-rich Xinjiang Autonomous Region. The body of the COREX furnace is composed of the upper reduction furnace and the lower melting gasifier. The reduction furnace is divided into three types: shaft furnace, tank furnace and fluidized bed furnace. The principle of COREX ir...

AI Technical Summary

Problems solved by technology

The sinter and coke put into the blast furnace go through preheating, indirect reduction reaction, and direct reduction reaction to produce iron in sequence. The whole process is carried out slowly, and the heat loss of the furnace body is relatively large.

Coal powder can be injected from the lower part of the blast furnace to save coke, but the space in the lower part of the blast furnace is small, and the amount of pulverized coal injected is very small, so it is difficult for the pulverized coal to burn in a narrow space

Images