Blast furnace gas pipeline alkali spraying and deacidification device and process

Abstract

The invention discloses a blast furnace gas pipeline alkali spraying and deacidification device. The device comprises cooling spray guns (1), alkali liquor spray guns (8) and a gas demister (15), wherein the cooling spray guns (1), the alkali liquor spray guns (8) and the gas demister (15) are sequentially arranged on a blast furnace gas pipeline; the cooling spray guns (1) are connected with corresponding cooling spray gun control boxes (2) and used for spraying mixed cooling nitrogen and industrial fresh water into the blast furnace gas pipeline to lower the temperature of blast furnace gas and saturate water vapor in the blast furnace gas; the alkali liquor spray guns (8) are connected with corresponding alkali liquor spray gun control boxes (9) and used for spraying mixed alkali spraying nitrogen and cyclic alkali liquor into the blast furnace gas pipeline to neutralize acidic materials in the blast furnace gas and lower the temperature of the blast furnace gas. The invention further discloses a blast furnace gas pipeline alkali spraying and deacidification process. By means of the blast furnace gas pipeline alkali spraying and deacidification device and process, pipeline and equipment corrosion caused by acidic ions such as chloride ions can be effectively mitigated, and the service life of pipelines and equipment is prolonged.

Description

technical field

[0001] The invention relates to the technical field of metallurgy, in particular to a deacidification process of blast furnace gas after dry dust removal. Background technique

[0002] At present, domestic large and medium-sized blast furnaces adopt dry dust removal process, resulting in more acidic substances (such as chloride ions, sulfite ions, sulfate ions, etc.) in blast furnace gas. When the blast furnace gas is transported through the TRT (or pressure reducing valve group) and the pipe network, the temperature of the gas drops, and part of the condensed water is precipitated, and the condensed water contains a certain amount of chloride ions and sulfite ions, forming strong acidity and forming a primary battery. , resulting in severe corrosion of low-temperature net gas pipelines and gas equipment, shortening the service life of pipelines and equipment.

[0003] At present, some domestic companies use scrubbers to remove acid ions in gas, but the inve...

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