Tail gas dehydration and dust removal tower for preparing sponge iron through gas-based reduction

Abstract

The invention generally relates to the technical field of metallurgy, and provides a tail gas dehydration and dust removal tower for preparing sponge iron through gas-based direct reduction, which comprises a pre-dust removal section (1) and a fine dust removal section (4), wherein the two sections comprise distributors, fillers or tower trays and conical water outlets, the two sections are connected through a tail gas pipe (8), a demister is arranged at the top of the fine dust removal section (4), the pre-dust removal section (1) and the fine dust removal section (4) are arranged in the samecylindrical tower body in the height direction, and dedusting water at the bottom of the fine dust removal section (4) is communicated with dedusting water of the pre-dust removal section (1). The tail gas dehydration and dust removal tower provided by the invention can effectively remove particles and liquid drops in the tail gas at the outlet of the sponge iron moving bed reaction furnace, andsolves the problems of incomplete removal of the particles and the liquid drops, substandard cooling temperature and the like in the existing tail gas dehydration and dust removal tower.

Description

technical field [0001] The invention generally relates to the technical field of metallurgy, and in particular to a tail gas dehydration and dedusting tower for preparing sponge iron by gas-based reduction. Background technique [0002] China is the dominant force in the global steel industry, and China currently produces almost half of the world's steel. Before steelmaking, ironmaking must be done. This is an extremely energy-intensive process, and a large amount of gas emissions will be generated in the traditional combined ironmaking and steelmaking process. [0003] Sponge iron process (direct reduction method) can convert iron ore into metallic iron without melting, which reduces tail gas emissions. However, the existing tail gas scrubber is single-stage washing, which consumes a lot of water and does not remove impurities thoroughly. Moreover, the simple water washing process cannot effectively remove the impurity gas in the exhaust gas, which affects the quality of t...

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Problems solved by technology

[0003] Sponge iron process (direct reduction method) can convert iron ore into metallic iron without melting, which reduces tail gas emissions. However, the existing tail gas scrubber is single-stage washing, which consumes a lot of water and does not remove impurities thoroughly. Moreover, the simple water washing process cannot effectively remove the impurity gas in the exhaust gas, which affects the quality of the exhaust gas, and also brings impurities such as particulate matter into the downstream equipment

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