Carbonator-Classifier Separation for Cleaner Flue Gas CO2 Capture
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Solution Overview
Problem
Existing fossil fuel-based power plants using Regenerative Calcium Cycle (RCC) systems face challenges due to acidic components from coal combustion reducing the sorbent's CO2 absorption ability and the need for near-pure oxygen, leading to complex gas processing requirements.
Innovation Solution
An integrated system with a classifier and carbonator that uses flue gas velocity to separate CO2-absorbing sorbent from heat-transferring particles, eliminating the need for separate classification and reducing gas processing complexity by integrating the classifier into the carbonator process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If in-situ oxy-fired coal combustion is used to supply heat for calcination, then the calcination reaction can proceed, but acidic components (sulfur and chlorine compounds) reduce the sorbent's CO2 absorption ability
Solution Approach 1:
The system separates the heat supply function from the sorbent processing function by introducing inert heat-transferring particles into the calciner. These particles receive heat from oxy-fired combustion and transfer it to the sorbent, while the sorbent is protected from direct contact with acidic combustion components. This segmentation allows high-temperature calcination to proceed while preserving sorbent absorption ability.
2Power
If near pure oxygen is used to drive the calcination reaction, then the calcination process can be sustained, but air ingress and impurities require dedicated gas processing units to meet pipeline specifications
Solution Approach 1:
The classifier and carbonator are merged into a single integrated unit. The classifier, which normally would be a separate device requiring gas processing, is combined with the carbonator functionality. This integration eliminates the need for dedicated gas processing units while maintaining the ability to sustain calcination reactions and meet pipeline specifications.
Solution Approach 2:
The integrated classifier-carbonator unit performs multiple functions: it classifies particles by size, absorbs CO2 from flue gas, and prepares gas for pipeline transport. This multi-functional design replaces what would otherwise require separate dedicated units, reducing overall system complexity while maintaining near-pure oxygen calcination capabilities.
3Device complexity
If the classifier is integrated into the carbonator process, then gas processing complexity is reduced, but the separation of heat-transferring particles and sorbent must be achieved through flue gas velocity control
Solution Approach 1:
The system uses pneumatic classification where flue gas velocity is controlled to separate particles based on their aerodynamic properties. Heat-transferring particles and sorbent particles are separated by adjusting the gas velocity in the integrated classifier-carbonator, allowing size-based separation without mechanical moving parts. This pneumatic approach simplifies the integrated unit while enabling effective particle separation.
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
Enhances CO2 capture efficiency by minimizing sorbent degradation and simplifying gas processing, thereby reducing CO2 emissions effectively.
Implementation Method 1
The mixture is fluidized within the classifier via the flue gas at a velocity such that the flue gas entrains and transports the carbon absorbing particles to the carbonator while the heat-transferring particles are not entrained nor transported to the carbonator
Implementation Method 2
the flue gas entrains and transports the carbon absorbing particles to the carbonator
Implementation Method 3
the carbonator receives the flue gas and the carbon absorbing particles. The carbon absorbing particles absorb the carbon dioxide from the flue gas
Data Source
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AI summary
A system for reducing carbon dioxide emissions from a flue gas generated via combusting a fossil fuel is provided. The system includes a carbonator and a classifier. The carbonator is configured to receive the flue gas and carbon absorbing particles. The classifier is fluidly connected to the carbonator and configured to receive a mixture that includes heat-transferring particles and the carbon absorbing particles. The mixture is fluidized within the classifier via the flue gas at a velocity such that the flue gas entrains and transports the carbon absorbing particles to the carbonator while the heat-transferring particles are not entrained nor transported to the carbonator.