Two-Stage Venturi CO2 Removal with pH Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for an efficient and effective system to remove carbon dioxide from gas streams in various industrial and environmental sources, as carbon dioxide is a greenhouse gas contributing to global warming and climate change.
Innovation Solution
A system utilizing a series of venturi educators and reactors with alkaline solutions at specific pH ranges to induce reactions that convert carbon dioxide into metal bicarbonate and metal carbonate, with pH adjustment and dilution subsystems to prevent precipitation and maintain reaction efficiency, coupled with heat exchangers and evaporators for temperature control and waste heat utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-stage alkaline absorption system is used, then the system complexity is reduced, but the carbon dioxide removal efficiency is insufficient
Solution Approach 1:
The absorption system is divided into two distinct stages: a first absorption reactor operating at high pH (10-15) to remove the majority of CO2, and a second absorption reactor operating at lower pH (8-10) to polish remaining CO2. This segmentation allows each stage to be optimized for its specific function, achieving high overall removal efficiency while keeping individual reactor designs relatively simple
2Productivity
If alkaline solution concentration is increased to improve reaction rate, then carbon dioxide absorption speed increases, but metal carbonate precipitate formation increases
Solution Approach 1:
The system separates the high-concentration absorption function (first reactor with concentrated alkaline solution at pH 10-15) from the low-concentration polishing function (second reactor with diluted solution at pH 8-10). This segmentation allows the first reactor to operate at high concentration for fast reaction without excessive precipitate, while the second reactor handles remaining CO2 at lower concentration where precipitate formation is minimized
Solution Approach 2:
The system dynamically adjusts pH as a critical parameter across different stages. The first reactor maintains pH 10-15 for rapid CO2 absorption, then the solution is diluted and pH is reduced to 8-10 in the second reactor. This parameter change optimizes both absorption speed and precipitate control at different stages of the process
3Reliability
If continuous operation is maintained to ensure consistent carbon dioxide removal, then emission reduction is sustained, but alkaline solution consumption increases
Solution Approach 1:
The system discards the depleted alkaline solution from the first reactor after it has absorbed the bulk of CO2, and recovers by introducing fresh alkaline solution. The second reactor similarly processes and discards its solution after polishing remaining CO2. This approach ensures continuous effective operation while managing alkaline solution consumption through controlled replacement rather than attempting full recycling
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 system effectively removes a majority of carbon dioxide from gas streams, reducing greenhouse gas emissions and minimizing operational costs by recycling alkaline solutions and utilizing waste heat, producing valuable metal bicarbonate or carbonate products.
Implementation Method 1
The first venturi eductor is configured to receive the flow of gas having carbon dioxide therein and a flow of a first alkaline solution
Implementation Method 2
induce a reaction of the carbon dioxide with the first alkaline solution to form a solution having metal bicarbonate therein
Implementation Method 3
at least one heat exchanger subsystem configured to cool the flow of the gas having carbon dioxide therein
Data Source
AI summary
A system for removing carbon dioxide from a flow of gas having carbon dioxide therein is featured. The system includes a first venturi eductor and first reactor which receive the flow of gas having carbon dioxide therein and a flow of a first alkaline solution at a first predetermined pH range. The first venturi eductor and reactor mix and provide reaction time for the flow of gas having carbon dioxide therein and the flow of the first alkaline solution to induce a reaction of the carbon dioxide with the first alkaline solution to form a solution having metal bicarbonate therein. A second venturi eductor and reactor mix the flow of the partially treated gas with the flow of the second alkaline solution and provide reaction time to react a majority of the remaining carbon dioxide with the second alkaline solution to form a solution having metal carbonate therein.