Solid CO2 Absorbent for Exhaust Gas Capture
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Solution Overview
Problem
Existing methods for capturing CO2 from exhaust gas, such as wet chemical absorption and cryogenic fractionation, are costly and difficult to apply in large-scale industries like electric power plants, and conventional dry recycling/absorption technologies face challenges in continuous particle transport between absorption and recycling reactors.
Innovation Solution
A CO2 absorbent composed of 5-70 wt% active component, 5-70 wt% support, 5-70 wt% inorganic binder, and 5-70 wt% recycling improver, prepared by mixing solid materials into a slurry, spray drying, and calcination, allowing for efficient CO2 capture and recycling within an exhaust gas temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wet chemical absorption or cryogenic fractionation is used to remove CO2, then CO2 capture effectiveness is improved, but capture cost increases and application to large-scale industries becomes difficult
Solution Approach 1:
The patent replaces liquid solvent-based wet chemical absorption with a solid absorbent-based dry absorption system. The solid absorbent material directly captures CO2 through chemical reaction without requiring liquid solvents, thereby simplifying the system and reducing operational costs while maintaining high capture effectiveness suitable for large-scale industrial application
Solution Approach 2:
The patent changes the physical state parameter of the absorbent from liquid to solid form. This parameter change enables the system to operate without complex liquid handling equipment, reduces operational costs, and improves ease of manufacture while maintaining effective CO2 capture capability
2Ease of manufacture
If conventional dry recycling/absorption technology is used, then CO2 capture cost is reduced, but continuous particle transport between absorption and recycling reactors becomes difficult
Solution Approach 1:
The patent employs a porous structured solid absorbent that facilitates particle flow and transport. The porous structure reduces particle density and improves fluidity, enabling continuous transport between absorption and recycling reactors while maintaining the cost advantages of dry absorption technology
Solution Approach 2:
The patent uses a composite solid absorbent material comprising multiple components (alkali metal carbonate, support material, and binder) that work together to optimize both operational properties for continuous transport and economic advantages for cost-effective CO2 capture
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The absorbent effectively captures CO2, can be repeatedly used, reduces capture costs, and operates efficiently in large-scale industries without the need for additional heat sources, achieving high CO2 absorption and recycling capabilities.
Implementation Method 1
CO2 contained in exhaust gas is captured by carbonate or bicarbonate generated by an active component and CO2 in a solid absorbent in an absorption reactor through a chemical reaction
Implementation Method 2
preparing an absorbent by drying the prepared slurry using a spray drier
Implementation Method 3
preparing a final absorbent by dry calcinating the primarily prepared absorbent
Data Source
AI summary
A CO2 absorbent for exhaust gas capable of being repeatedly used in capturing and recycling of CO2 is provided. The CO2 absorbent for exhaust gas capturing CO2 included in exhaust gas is composed of solid materials including an active component at 5 to 70 wt %, a support at 5 to 70 wt %, an inorganic binder at 5 to 70 wt % and a recycling improver at 5 to 70 wt %. The CO2 absorbent for exhaust gas having such a composition meets the requirements for processes, including physical properties such as a spherical shape, an average particle size and size distribution, a tap density and attrition resistance, and has excellent CO2 absorbing capability and recycling capability.The carbon dioxide absorbent for exhaust gas satisfies physical characteristics such as spherical shape, average particle size and size distribution, tap density, attrition resistance and the like required for processes, and has excellent CO2 absorption and recycling capabilities.