Chemical Looping Integration with CO2 Purification
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Solution Overview
Problem
Chemical looping systems require an external lift gas to facilitate efficient combustion in both the oxidizer and reducer, which can reduce efficiency and increase costs, especially when using steam or product carbon dioxide, and existing solutions add contaminants to flue gases.
Innovation Solution
Integrating a carbon dioxide gas purification unit with a chemical looping system to recycle vent gases as a lift gas, reducing the need for external lift gases and utilizing carbon-bearing compounds to enhance fuel conversion and reduce emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If external lift gas is used in the chemical looping system, then efficient combustion is achieved, but the need for external lift gas increases operational costs and reduces overall efficiency
Solution Approach 1:
The patent combines the gas purification unit with the chemical looping system by integrating the vent gas recycle loop. The vent gas from the gas purification unit is recycled back to the reducer as lift gas, merging two previously separate functions (combustion support and gas purification) into a unified system that eliminates the need for external lift gas and improves overall operational efficiency
2Ease of operation
If steam or product carbon dioxide is used as lift gas, then combustion is facilitated, but additional contaminants are added to the flue gases
Solution Approach 1:
The patent recovers vent gas that would otherwise be discarded from the gas purification unit and reuses it as lift gas in the reducer. This recovery approach eliminates the need to introduce additional contaminants through external lift gas sources while maintaining effective combustion support
Data Source
AI summary
A chemical looping system that contains an oxidizer and a reducer is in fluid communication with a gas purification unit. The gas purification unit has at least one compressor, at least one dryer; and at least one distillation purification system; where the gas purification unit is operative to separate carbon dioxide from other contaminants present in the flue gas stream; and where the gas purification unit is operative to recycle the contaminants to the chemical looping system in the form of a vent gas that provides lift for reactants in the reducer.