A method and system for directed deep fine desulfurization of syngas for integrated coal gasification combined cycle power generation

By employing pretreatment, alkanolamine desulfurization, and catalyst regeneration technologies, combined with a presulfurization catalyst supported on a TiO2-Al2O3 composite carrier, the deep desulfurization problem of sulfides in IGCC syngas was solved, achieving efficient and low-cost sulfide removal and catalyst regeneration, thus meeting environmental protection requirements.

CN122128019APending Publication Date: 2026-06-02SHANDONG JIAEN ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG JIAEN ENVIRONMENTAL PROTECTION TECH CO LTD
Filing Date
2026-03-28
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In existing technologies for integrated gasification combined cycle (IGCC) power generation, it is difficult to achieve deep desulfurization of sulfides in syngas to below 0.1 ppm. Traditional desulfurization technologies have high energy consumption, large equipment investment, and catalysts are prone to coking, leading to decreased activity. Furthermore, they are difficult to effectively remove byproducts such as mercaptans and sulfides, resulting in environmental emissions and equipment corrosion problems.

Method used

A method of pretreatment-primary alkanolamine desulfurization-secondary catalytic adsorption desulfurization-GC-SCD source traceability optimization-catalyst regeneration is adopted, using a pre-sulfurized NiMoS/CoMoS catalyst on a TiO2-Al2O3 composite support, combined with low-temperature coking and resulfurization technology, to achieve directional deep fine desulfurization of syngas.

Benefits of technology

It achieves efficient deep desulfurization under mild conditions, with the total sulfur content consistently below 0.1 ppm, inhibiting the formation of byproducts such as mercaptans and thioethers, extending catalyst life, and reducing energy consumption and operating costs.

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Abstract

This invention discloses a method and system for targeted deep desulfurization of syngas for integrated gasification combined cycle (IGCC) power generation, belonging to the field of gas purification. The process includes pretreatment to remove impurities, removal of most inorganic sulfur using an alkanolamine solution, and graded treatment of the syngas through an Al2O3 layer, a pre-sulfurized NiMoS / CoMoS catalyst layer, and a zinc oxide layer in a fine desulfurization tower. GC-SCD technology is used to trace the sulfur form and optimize the process. The deactivated catalyst is regenerated by low-temperature coking and resulfurization. The pre-sulfurization catalyst uses TiO2-Al2O3 as a carrier, with TiO2 accounting for 5-15 wt%, and the catalytic hydrolysis conditions are 100-140℃ and 1.5-2.2 MPa. This invention achieves targeted conversion of organic sulfur under mild conditions, inhibits the formation of thiols and sulfides, and the catalyst is regenerable. The total sulfur in the treated syngas is ≤0.1 ppm, making it suitable for ultra-deep purification of IGCC and coal chemical syngas, with high desulfurization efficiency and low operating costs.
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