Amine CO2 Absorption Control via Cooling Liquid Hydroxide Adjustment
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Solution Overview
Problem
Existing exhaust gas treatment systems using amine-based absorbing liquids face issues with oxidative deterioration, leading to the generation of aldehydes and requiring costly and labor-intensive liquid replacements.
Innovation Solution
An exhaust gas treatment system with a cooling tower, absorption tower, and regeneration tower, equipped with an addition unit to adjust hydroxide ion concentration in the cooling liquid, a state detection unit, and a control apparatus to manage the additive's amount based on the detected state of the amine-based absorbing liquid, effectively suppressing oxidative deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amine-based absorbing liquid is replaced based on electrical conductivity and oxidation-reduction potential, then the absorption performance is maintained, but labor and cost increase
Solution Approach 1:
The system uses automatic detection units to monitor the absorbing liquid's state and a control apparatus to automatically control the regeneration process, eliminating the need for manual replacement decisions and operations. The system serves itself by detecting when regeneration is needed and automatically initiating the regeneration process.
Solution Approach 2:
The invention monitors changes in electrical conductivity and oxidation-reduction potential parameters to determine when the absorbing liquid needs regeneration. By tracking these parameter changes over time, the system optimizes the regeneration timing to maintain absorption performance while minimizing unnecessary replacements.
2Productivity
If the amine-based absorbing liquid is oxidized by oxygen in exhaust gas, then carbon dioxide absorption occurs, but aldehydes are generated and discharged into the atmosphere
Solution Approach 1:
The invention converts the harmful oxidation process that generates aldehydes into a beneficial process by controlling it to occur in the regeneration tower rather than the absorption tower. The oxidation that would normally occur during absorption is redirected to occur during regeneration, where the aldehydes can be managed and prevented from being discharged into the atmosphere.
Solution Approach 2:
The regeneration tower acts as an intermediary structure that separates the absorption and oxidation processes. By providing a dedicated space for oxidation to occur during regeneration, the system prevents direct contact between oxidized amine products and the exhaust gas stream, thereby preventing aldehyde discharge.
3Object-generated harmful factors
If the amine-based absorbing liquid is frequently replaced to prevent oxidative deterioration, then aldehyde generation is reduced, but labor and cost increase
Solution Approach 1:
The system employs detection units that continuously monitor the state of the absorbing liquid and provide feedback to the control apparatus. This feedback mechanism allows the system to track the oxidation level and absorption performance in real-time, enabling optimized regeneration scheduling that prevents excessive aldehyde generation while minimizing the frequency of liquid replacement.
4Device complexity
If the cooling liquid's hydroxide ion concentration is not adjusted, then the system operation is simple, but oxidative deterioration of the absorbing liquid increases
Solution Approach 1:
The invention controls the hydroxide ion concentration parameter of the cooling liquid to optimize the stability of the amine-based absorbing liquid. By adjusting this chemical parameter within a specific range, the system suppresses oxidative deterioration and extends the absorbing liquid's service life, reducing replacement frequency and associated costs.
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 minimizes labor and cost associated with amine-based absorbing liquid replacement by controlling oxidative deterioration, reducing aldehyde generation and corrosion, while maintaining effective carbon dioxide capture.
Implementation Method 1
a cooling tower configured to cool exhaust gas by bringing the exhaust gas containing carbon dioxide into contact with a cooling liquid
Implementation Method 2
an absorption tower in which an amine-based absorbing liquid capable of absorbing the carbon dioxide in the exhaust gas is introduced and the carbon dioxide in the exhaust gas passing through the cooling tower is absorbed by the amine-based absorbing liquid
Implementation Method 3
a regeneration tower configured to heat the amine-based absorbing liquid absorbing the carbon dioxide, separate the carbon dioxide from the amine-based absorbing liquid, and regenerate the amine-based absorbing liquid
Implementation Method 4
an addition unit configured to add an additive for adjusting a hydroxide ion concentration of the cooling liquid to the cooling liquid
Data Source
AI summary
In an exhaust gas treatment system, a cooling tower cools an exhaust gas containing carbon dioxide. In an absorption tower, an amine-based absorbing liquid capable of absorbing the carbon dioxide in the exhaust gas is introduced and the carbon dioxide in the exhaust gas passing through the cooling tower is absorbed by the amine-based absorbing liquid. A regeneration tower heats the amine-based absorbing liquid absorbing the carbon dioxide, separates the carbon dioxide from the amine-based absorbing liquid, and regenerates the amine-based absorbing liquid. An addition unit adds an additive for adjusting a hydroxide ion concentration of the cooling liquid to the cooling liquid. A state detection unit detects a state of the amine-based absorbing liquid. A control apparatus adjusts an amount of addition of the additive in the addition unit based on a state of the amine-based absorbing liquid detected by the state detection unit.