Venturi Cavitation for Mineral Carbonate Sequestration
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Solution Overview
Problem
Current carbon capture and sequestration technologies are energy-intensive and costly, making it difficult to effectively and efficiently transform CO2 into stable mineral carbonates for long-term storage, while also dealing with environmental hazards from industrial waste and greenhouse gas emissions from tailing ponds.
Innovation Solution
A slurry-based system that injects gases into a mineral oxide slurry, using a venturi to create cavitation and turbulent flow, which enhances the chemical reaction rate and forms carbon-rich precipitates like Calcium Carbonate, allowing for efficient dewatering and sequestration of carbon dioxide equivalents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If ex-situ mineral carbonation is used to transform CO2 into mineral carbonates, then long-term storage stability is improved, but energy consumption and process cost increase due to mining, transport, grinding and activation of solid reactants
Solution Approach 1:
The system utilizes naturally occurring alkaline earth metals in the environment (soil, water, rock formations) as carbon sinks, eliminating the need for mining, transport, and processing of solid reactants. The method allows the environment to serve itself by naturally capturing and storing CO2 through mineral carbonation processes without requiring external energy input for material preparation.
Solution Approach 2:
The invention extracts only the essential function of mineral carbonation (CO2 transformation into stable carbonates) while removing the energy-intensive steps of mining, transporting, grinding, and activating solid reactants. By using naturally available alkaline earth metals in the environment rather than processed materials, the system retains the stability benefit while eliminating the associated energy consumption.
2Productivity
If chemical solutions or dry solid absorbents are used for atmospheric carbon capture, then CO2 capture efficiency is improved, but process complexity increases due to additional carbon removal steps required before sequestration
Solution Approach 1:
The method merges the carbon capture function with the carbon sequestration function into a single integrated process. By directly injecting CO2 into environments containing alkaline earth metals, the system combines what would otherwise be separate steps (capture using chemical solutions/absorbents followed by additional processing and transport to storage sites) into one direct mineral carbonation process, thereby reducing overall process complexity while maintaining capture efficiency.
Solution Approach 2:
The invention uses naturally occurring alkaline earth metals in the environment as an intermediary medium that directly transforms CO2 into stable carbonate minerals. This eliminates the need for separate chemical solution absorption steps and subsequent carbon removal processes, simplifying the overall system while maintaining high capture efficiency through direct in-situ mineral carbonation.
3Device complexity
If in-situ mineral carbonation is used for greenhouse gas mitigation, then process simplicity is improved, but storage capacity and sequestration effectiveness decrease compared to ex-situ methods
Solution Approach 1:
The system enables in-situ mineral carbonation to serve multiple functions simultaneously: it provides simplified direct injection processes while also achieving significant storage capacity by utilizing the vast reserves of alkaline earth metals present in soil, water, and rock formations. The method transforms the limitation of in-situ approach (lower perceived capacity) into an advantage by demonstrating that environmental reservoirs contain sufficient alkaline earth metals to sequester substantial quantities of CO2, thereby matching or exceeding ex-situ storage capacities while maintaining process simplicity.
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
This method reduces the energy requirements and costs associated with carbon capture, effectively stabilizes carbon in mineral form, and provides a solution for environmental hazards by utilizing industrial waste and reducing greenhouse gas emissions from tailing ponds.
Implementation Method 1
Cavitation occurs when the pressure drops below the vapor pressure of the liquid, causing the formation of vapor bubbles. These bubbles collapse, releasing energy in the form of shock waves helping mix the slurry with the additive gases and increase a chemical reaction rate.
Implementation Method 2
The lowered pressure and venturi configuration induces cavitation and turbulent flow.
Implementation Method 3
As the slurry passes through the venturi, pressure within the venturi drops enabling the introduction of reactive gases to the slurry.
Implementation Method 4
The combined gasified slurry is directed to a pressure inducing device such as a filter press creating a mineralization environment in which a carbonate precipitate is formed.
Data Source
AI summary
Increasing the pressure of a slurry by a filter press in which mineral oxide reacts with carbon dioxide enhances the formation of the carbonate by increasing the solubility and availability of carbon dioxide, accelerating reaction rates, shifting equilibria favorably, and promoting the formation of reaction intermediates like bicarbonate ions. A more efficient and faster synthesis of metal carbonates results.