CO2 Recovery Apparatus Liquid Level Control
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Solution Overview
Problem
The existing carbon dioxide recovery apparatus faces challenges in maintaining stable absorption liquid concentration due to fluctuations caused by water vaporization and amine compound release during the regeneration process, leading to inefficient carbon dioxide recovery and increased operational costs.
Innovation Solution
The apparatus utilizes condensed water from the regeneration step to adjust the liquid level of the absorbing liquid, ensuring stable recovery performance by detecting and restoring the liquid level using a liquid level meter and recovery device, thereby maintaining consistent liquid quality and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heating is applied in the regeneration step to release carbon dioxide, then carbon dioxide recovery is achieved, but water and amine compound are vaporized and lost
Solution Approach 1:
The invention recovers water and amine compounds that are vaporized during the regeneration step by condensing them from the off-gas stream. This condensed liquid is then returned to the absorbing liquid system, preventing loss of the absorbent and reducing the need for make-up water and amine
Solution Approach 2:
The invention converts the harmful effect of vaporization (loss of absorbing liquid) into a beneficial recovery process by condensing the vaporized components and returning them to the system. The heat applied for regeneration that causes vaporization is thus transformed into a mechanism for concentrating and recovering the absorbent
2Productivity
If the absorbing liquid is circulated between absorption and regeneration steps, then carbon dioxide recovery continues, but the concentration of the absorbing liquid changes
Solution Approach 1:
The invention implements a feedback control system where the condensed liquid from the regeneration off-gas is automatically returned to the absorbing liquid system. This closed-loop approach continuously monitors and adjusts the absorbing liquid composition by returning vaporized components, maintaining stable concentration despite continuous circulation and regeneration
Solution Approach 2:
By recovering and returning the vaporized water and amine compounds to the absorbing liquid system, the invention prevents composition drift that would otherwise occur during continuous circulation. The recovered components replenish what is lost during regeneration, maintaining consistent absorbing liquid concentration
3Productivity
If heating is applied to regenerate the absorbing liquid, then carbon dioxide is released, but energy consumption increases
Solution Approach 1:
The invention converts the energy input required for heating into a beneficial concentration effect. The heat applied for regeneration vaporizes water and amine compounds, which are then condensed and returned to the system, effectively using the thermal energy to drive the recovery and concentration process
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 approach stabilizes the absorption liquid concentration, enhances carbon dioxide recovery efficiency, and reduces operational costs by utilizing general facilities without the need for special equipment, providing economic advantages and improved environmental protection.
Implementation Method 1
a basic compound that typically belongs to alkanolamines is mainly used as an absorbent, and the absorbing liquid is circulated in the treatment process thereof, generally, with use of an aqueous solution containing the absorbent as the absorbing liquid, by alternately repeating an absorption step of causing the absorbing liquid to absorb carbon dioxide contained in the gas
Implementation Method 2
Heating for the release of carbon dioxide is needed in the regeneration step
Implementation Method 3
a regeneration step of regenerating the absorbing liquid by causing the absorbing liquid to release the absorbed carbon dioxide
Implementation Method 4
Water and the absorbent constituting the absorbing liquid are easily vaporized during heating in the regeneration step
Implementation Method 5
a liquid level meter that detects a liquid level changing in accordance with quantitative fluctuation of the absorbing liquid
Implementation Method 6
a recovery device that recovers vapor contained in a recovery gas comprising the carbon dioxide discharged from the regeneration column, as condensed water
Data Source
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AI summary
Change in the amount of an absorbing liquid is detected to restore the original amount, and carbon dioxide is stably recovered from exhaust gas. The recovery apparatus of carbon dioxide has: an absorption column where a gas contacts with an absorbing liquid that absorbs the carbon dioxide contained the gas; and a regeneration column where the absorbing liquid after absorption is heated to release carbon dioxide and the absorbing liquid is regenerated. Water vapor contained in the carbon dioxide-containing recovery gas, discharged from the regeneration column, is condensed by a recovery device, and the condensed water is supplied at a fixed flow rate to the regeneration column. A liquid level meter detects the liquid level that changes in accordance with fluctuations in the amount of the absorbing liquid. If the liquid level is lowered, a restoration system restores the original liquid level, using the condensed water. The condensed water in an amount sufficient to restore the liquid level is supplied to the absorbing liquid near the liquid level meter.