Biomass-based direct-reduction ironmaking device and method

Abstract

The invention provides a biomass-based direct-reduction ironmaking device and a method thereof. The device provided by the invention comprises a blower fan, an air / pulverized coal premix pipe, a biomass feeder and a combustion chamber, wherein the biomass feeder is connected with the air / pulverized coal premix pipe; one end of the air / pulverized coal premix pipe is connected with the blower fan and the other end is connected with the combustion chamber; the bottom of the combustion chamber is provided with a slag removal outlet, the top is equipped with a flue gas outlet, and the intermediate part is provided with a reactor for direct-reduction ironmaking. The direct-reduction ironmaking method comprises green pellet preparation, preheating and direct reduction. The heat source needed for the preheating and reduction is provided by biomass combustion. Synthetic gas prepared by biomass catalysis and gasification is used as a reducing agent needed during the reduction process. According to the invention, coal and natural gas are replaced with biomass for direct-reduction ironmaking, thus reducing the dependence on fossil energy in the ironmaking industry, improving the quality of direct-reduction iron products, minimizing the harm to the environment, and fundamentally solving technological and equipment problems in the green ironmaking industry.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to a biomass-based direct reduction ironmaking device and method. Background technique [0002] The iron and steel industry is an important basic industry for the development of the national economy and an important symbol of the country's economic level and comprehensive national strength. Modern steelmaking raw materials mainly come from blast furnace ironmaking, a small amount of scrap steel and direct reduced iron. In the world iron and steel industry, about 60% of the supply of pig iron for steelmaking comes from blast furnaces, while in my country almost 90% comes from blast furnace ironmaking. my country's blast furnace ironmaking technology has encountered two major contradictions in the modern iron and steel industry: one is the contradiction between the high-quality coking that blast furnace ironmaking technology strongly relies on and the increasingly scar...

AI Technical Summary

Problems solved by technology

[0007] (2) The reaction temperature is low, the reaction speed is slow, and the charge stays in the reduction zone for a long time;

[0008] (3) Using pure hydrogen as the reducing agent can improve the production efficiency of the whole process, but the operating cost is relatively high;

[0010] To sum up, the technical development of non-blast furnace ironmaking is to use coal or natural gas instead of coking coal. The energy structure has not undergone fundamental changes, and it is still inseparable from fossil energy, which is harmful to environmental pollution, especially carbon reduction. platoon has not fundamentally improved

At the same time, their energy consumption is higher than that of blast furnace ironmaking, and their quality is still far from that of blast furnace ironmaking. There is no advantage in their comprehensive benefits, and the research and application progress is slow

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