Pressure Swing Adsorption Steam Ratio Optimization
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Solution Overview
Problem
Current pressure swing adsorption (PSA) processes for CO2 separation in sorption-enhanced water gas shift (SEWGS) face challenges in optimizing carbon capture ratio (CCR) and carbon purity (CP) while minimizing steam consumption and maintaining constant cycle times, often leading to suboptimal solutions due to the non-linear nature of the process and high computational complexity.
Innovation Solution
The method involves varying the ratio of rinse steam to purge steam (R/P) at a fixed total steam amount, allowing for efficient optimization of CCR and CP, with the R/P ratio being adjusted to identify optimal process conditions that balance steam usage and product purity, thereby reducing the complexity of further optimization and achieving higher CCR and CP with lower steam consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optimization methods are used to adjust purge and rinse steam amounts independently, then one parameter (e.g., carbon purity) may be improved, but the other parameter (e.g., carbon capture ratio) deteriorates
Solution Approach 1:
The invention changes the optimization parameter from independent adjustment of purge steam amount and rinse steam amount to joint optimization using their ratio (purge steam amount/rinse steam amount) and total steam amount. This parameter transformation resolves the contradiction by enabling simultaneous improvement of both carbon purity and carbon capture ratio, as demonstrated in the examples where this approach achieved CCR ≥ 94% and CP ≥ 94%, whereas conventional independent adjustment led to one parameter deteriorating when the other was improved.
2Reliability
If accurate physical models are used for optimization, then new process knowledge can be generated, but computational cost and complexity increase significantly
Solution Approach 1:
The invention transforms the complex multi-parameter optimization problem into a simplified two-parameter problem by introducing the ratio of purge steam amount to rinse steam amount and the total steam amount as new optimization variables. This parameter transformation maintains the accuracy of physical models for generating reliable process knowledge while significantly reducing computational complexity, as the optimized ratio and total steam amount can be determined more efficiently than traditional multi-parameter optimization.
3Productivity
If purge steam amount is increased to improve carbon capture ratio, then more CO2 is captured, but steam consumption increases
Solution Approach 1:
The invention changes the optimization approach from independently increasing purge steam amount to optimizing the ratio of purge steam amount to rinse steam amount together with total steam amount. This allows achieving high carbon capture ratio (≥94%) while controlling steam consumption, as the joint optimization identifies the most efficient steam distribution between purge and rinse steps, avoiding unnecessary steam consumption that would occur with independent increase of purge steam.
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 enables reliable and efficient optimization of CCR and CP, ensuring that both parameters are within desired ranges while minimizing steam usage, providing a more robust and efficient method compared to conventional optimization techniques.
Implementation Method 1
Pressure swing adsorption (PSA) is a promising technology to remove CO2 from a gas stream; also for CO2 producing industries.
Implementation Method 2
subsequently at a second pressure CO2 desorbs therewith providing a CO2 rich gas stream
Data Source
AI summary
The invention concerns an optimization method for a pressure swing adsorption process for separating CO2 from a feed gas by adapting the ratio of rinse steam to purge steam at a fixed amount of total steam.