Dual Absorber CO2 Capture System Heat Integration
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Solution Overview
Problem
Existing carbon dioxide capture systems require significant energy to regenerate the absorbing liquid, particularly in larger systems, as higher temperatures are needed to release carbon dioxide, leading to increased recovery energy demands.
Innovation Solution
The system employs two capture systems with different absorbing liquids, where the second system releases carbon dioxide at a lower temperature than the first, utilizing the heat from the first system's reboiler to reduce energy consumption by recycling heat and optimizing the temperature for carbon dioxide release in the second system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the stripper heats the absorbing liquid to a higher temperature to release more carbon dioxide, then the carbon dioxide release efficiency is improved, but the energy consumption of the reboiler increases significantly
Solution Approach 1:
The system divides the carbon dioxide capture process into two separate capture systems, each using different absorbing liquids with distinct temperature characteristics. The first system uses a high-temperature absorbing liquid for maximum CO2 release, while the second system uses a low-temperature absorbing liquid that requires less heating energy, thereby segmenting the energy demand across different operational zones
Solution Approach 2:
The invention changes the temperature parameter at which carbon dioxide is released by selecting different absorbing liquids with different thermal characteristics. The second absorbing liquid is specifically chosen to release CO2 at a lower temperature than the first, directly altering the thermal parameter to reduce reboiler energy requirements while maintaining capture effectiveness
2Productivity
If a single capture system uses a high temperature absorbing liquid to ensure complete carbon dioxide release, then the capture efficiency is improved, but the overall system energy consumption increases
Solution Approach 1:
The capture system is segmented into two parallel systems with different thermal profiles. The first system handles CO2 capture at high temperature for complete release, while the second system operates at lower temperature for partial release, together achieving comprehensive capture efficiency while distributing and reducing total energy loss across both systems
Solution Approach 2:
The system employs a composite approach by using two different absorbing liquids with complementary characteristics. The first absorbing liquid is optimized for high-temperature CO2 release, while the second is optimized for low-temperature release, creating a composite capture system that leverages the strengths of both materials to achieve high efficiency with reduced energy loss
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 reduces the total energy consumption of the carbon dioxide capture system by efficiently using recycled heat, minimizing the need for external heating sources and lowering the overall energy required for carbon dioxide capture.
Implementation Method 1
The absorber causes the carbon dioxide contained in the combustion exhaust gas to be absorbed in the amine absorbing liquid
Implementation Method 2
The stripper heats the absorbing liquid (rich liquid) containing the absorbed carbon dioxide and supplied from the absorber, causes the carbon dioxide to be released from the rich liquid
Data Source
AI summary
A carbon dioxide capture system includes a first capture system and a second capture system. The first capture system including a first absorber that causes carbon dioxide contained in a combustion exhaust gas to be absorbed in a first absorbing liquid. The second capture system causes carbon dioxide contained in a combustion exhaust gas to be absorbed in a second absorbing liquid. The second rich liquid releases carbon dioxide at a lower temperature than the first rich liquid.