Process method for CO purification by desulfurization and decarburization of blast furnace gas.

By using multi-level, multi-layer, large-particle adsorbents and spray treatment, the problem of low-energy desulfurization and decarbonization of blast furnace gas in the steel industry has been solved, generating high-concentration CO for chemical synthesis, thus achieving efficient resource utilization and economic benefits.

JP2026109560AActive Publication Date: 2026-07-01FUZHOU UNIV +1
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
FUZHOU UNIV
Filing Date
2025-11-27
Publication Date
2026-07-01

AI Technical Summary

Technical Problem

How to achieve desulfurization and decarbonization of blast furnace gas in the steel industry with low energy consumption using existing technologies, and how to convert it into high-value CO gas to improve resource utilization and reduce production costs, remains a challenge.

Method used

A multi-stage, multi-layered large-particle adsorbent is loaded into the adsorption tower. Utilizing its adsorption and flow guidance effects, the residence time of acidic gases in the adsorption tower is extended, promoting the reaction between ammonia and acidic gases. Through multi-stage spraying and pressure swing adsorption, efficient desulfurization and decarbonization are achieved, generating hydrogen ammonia carbonate. Furthermore, the CO concentration is increased through pressure swing adsorption.

Benefits of technology

It achieves low-energy desulfurization and decarbonization processes, generates high-concentration CO for chemical synthesis, improves resource utilization and reduces energy consumption, and meets environmental and economic needs.

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Abstract

This invention provides a process method for CO purification by desulfurization and decarburization of blast furnace gas, which has advantages such as achieving highly efficient desulfurization and decarburization and significantly reducing energy consumption. [Solution] The method includes the steps of introducing blast furnace gas into a pretreatment device for cooling, dehydration, dechlorination, and dust removal; sequentially introducing a decarburization and desulfurization adsorption device consisting of three stages (one, two, and three) filled with a large particle adsorbent to perform decarburization and desulfurization treatment to remove carbon dioxide, hydrogen sulfide, and carbonyl sulfide from the gas, wherein the third stage decarburization and desulfurization is performed by spraying unsalted water, the second stage decarburization and desulfurization is performed by spraying ammonia water, and the first stage decarburization and desulfurization is performed by spraying low-carbon ammonia water; and performing variable pressure adsorption on the blast furnace gas after decarburization and desulfurization treatment to obtain high-concentration CO gas. The method utilizes the adsorption and flow guidance action of the large granular adsorbent loaded into the adsorption device to improve the removal rate of ammonia from sulfur species and carbon dioxide in the blast furnace gas, while simultaneously producing ammonium bicarbonate.
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