Device and Method for Removal of Carbon Dioxide (CO) from Flue Gas of a Combustion Plant after Energy Conversion

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This invention relates to a combined method and device for capturing carbon dioxide (CO2) from the flue gas of combustion systems after energy conversion. It first passes the flue gas through a CO2-selective membrane module to remove part of the CO2, and then further treats the remaining gas using an adsorption or absorption unit to separate additional CO2. The system is designed to achieve high CO2 removal efficiency with lower energy consumption by leveraging the strengths of both membrane separation and absorption technologies.

Use CasesContent extracted from patent full text and abstract with AI.

• Retrofitting existing fossil-fuel power plants to capture CO2 emissions for climate change mitigation.
• Industrial combustion facilities seeking to reduce greenhouse gas output and meet environmental regulations.
• CO2 capture for enhanced oil recovery or chemical feedstock supply from energy plants.
• Deployment in waste incinerators or cement factories to prevent CO2 release.
• Post-combustion CO2 separation where flue gas treatment is required.

BenefitsContent extracted from patent full text and abstract with AI.

• High overall CO2 capture rate (up to 90% or more) with reduced impact on plant efficiency.
• Lower total energy consumption compared to stand-alone chemical absorption or membrane techniques.
• Potential for retrofitting to existing combustion-based energy plants without major redesign.
• Reduction in the amount of chemical absorbent used and associated regeneration energy.
• Flexible use of membrane and absorption techniques maximizes separation efficiency and product CO2 purity.
• Decreases greenhouse gas emissions, aiding regulatory compliance and climate objectives.
• Can enable the economic and practical storage or utilization of captured CO2.

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Patent Abstract

The invention relates to a method for separating carbon dioxide from the flue gas from an energy conversion, wherein the flue gas initially is supplied to a membrane unit, which comprises at least one membrane module having a CO2-selective membrane, in which part of the CO2 is separated from the flue gas as an enriched CO2 permeate. The flue gas depleted in this way (retentate) is then supplied to at least one further CO2 separating unit, in which part of the CO2 is separated from the flue gas by an adsorption means or an absorption means. The invention further relates to an apparatus for separating CO2 from a flue gas, which is suited for carrying out said method and has a membrane unit, comprising at least one membrane module having a CO2-selective membrane and a further CO2-separating unit, comprising an adsorption means or an absorption means.