Step-by-step dry deacidification system and method for blast furnace gas

Abstract

The invention discloses a step-by-step dry deacidification method for blast furnace gas, which comprises the following steps: raw gas generated at the top of a blast furnace passes through a gravity dust collector and a bag-type dust collector, then clean gas is fed into a dehydration drying tower through a gas input pipeline for dehydration, a dehydration drying agent bed layer is arranged in the middle of the dehydration drying tower, and anhydrous CaCl2 desiccant is packed in the shell. Coal gas passing through the dehydration drying tower is fed into an inorganic acid removal tower through a pipeline to remove HCl and H2S, an inorganic acid adsorbent bed layer is mounted in the middle of the interior of the inorganic acid removal tower, and the interior of the inorganic acid removal tower is filled with a CaO adsorbent. The coal gas passing through the inorganic acid removal tower is fed into an organic sulfur hydrolysis tower through a pipeline for COS hydrolysis, a hydrolysis catalyst bed layer is mounted in the middle of the interior of the organic sulfur hydrolysis tower, and the interior of the organic sulfur hydrolysis tower is filled with a COS hydrolysis catalyst. The coal gas passing through the organic sulfur hydrolysis tower is fed into a desulfurizing tower through a pipeline to remove H2S, a desulfurizing agent bed layer is mounted in the middle of the interior of the desulfurizing tower, a Fe2O3 desulfurizing agent is packed in the desulfurizing tower, and the coal gas passing through the desulfurizing tower enters a coal gas output pipeline.

Description

technical field [0001] The present invention relates to blast furnace gas purification, and more particularly to a system and method for dry removal of acidic components including sulfur and chlorine in blast furnace gas. Background technique [0002] The dry dedusting process of blast furnace gas and residual pressure and waste heat power generation technology are advanced technologies for the country to promote energy conservation and emission reduction in the iron and steel industry and develop circular economy. Blast furnace gas dry dust removal technology has gradually replaced the traditional wet dust removal technology and has become the first choice for blast furnace gas dust removal technology due to its advantages of water saving, high dust removal efficiency, full use of gas sensible heat, and high power generation capacity of gas residual pressure. Practice has proved that compared with the traditional wet dust removal technology, the dry dust removal technology ...

AI Technical Summary

Problems solved by technology

However, the blast furnace gas after dry dedusting will cause severe corrosion of gas pipelines, residual pressure turbine generator (TRT) blades and other ancillary equipment, which will cause vibration of TRT blades, gas leakage and heat storage efficiency reduction of hot blast stove checker bricks etc., which seriously affect the normal operation of the residual pressure and waste heat recovery device and the normal smelting of the blast furnace and bring about major safety hazards

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