CO2 Oxygen Removal Using Compression Heat and High-Pressure Hydrogen
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Solution Overview
Problem
Existing methods for removing oxygen from carbon dioxide streams are energy-intensive due to the need for heating, which increases the overall energy consumption and inefficiency of the carbon capture and storage process.
Innovation Solution
A method and system that utilize a high-pressure electrolyser to generate hydrogen at high pressure and temperature, which is combined with a compressed and heated carbon dioxide stream to react in a catalytic oxidation reactor, eliminating the need for additional thermal power and utilizing the compression heat for the reaction, thereby reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional heating methods are used to remove oxygen from carbon dioxide stream, then oxygen removal effectiveness is improved, but energy consumption increases
Solution Approach 1:
The patent combines the compression process and heating process into a single integrated operation. The mechanical compression of CO2 simultaneously achieves both pressure increase and temperature elevation, eliminating the need for separate heating equipment and reducing overall energy consumption while maintaining oxygen removal effectiveness.
Solution Approach 2:
The compression system performs multiple functions: it increases CO2 pressure for transportation and simultaneously heats the CO2 to the required reaction temperature for oxygen removal. This multi-functional approach eliminates dedicated heating equipment and reduces total energy input requirements.
2Productivity
If additional heating power is supplied to achieve reaction temperature, then reaction efficiency is improved, but process complexity increases
Solution Approach 1:
The patent merges the compression and heating functions into a single compression step. The adiabatic compression process inherently generates the necessary reaction temperature, eliminating the need for separate heating systems, temperature control equipment, and associated process complexity while maintaining reaction efficiency.
3Quantity of substance
If high-pressure electrolyser is used to generate hydrogen, then hydrogen availability for oxygen removal is improved, but equipment complexity increases
Solution Approach 1:
The patent employs a high-pressure electrolyser that produces hydrogen at elevated pressure (20-30 barg) directly, eliminating the need for subsequent hydrogen compression equipment. This preliminary pressurization action ensures adequate hydrogen availability for oxygen removal while reducing overall equipment complexity by removing intermediate compression stages.
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 significantly reduces energy requirements and enhances the efficiency of oxygen removal from carbon dioxide streams, making the process more effective and economical.
Implementation Method 1
compressing a gaseous oxygen-containing carbon dioxide stream and heating said stream to a reaction temperature by compression. The required reaction temperature is achieved by effect of conversion of mechanical power into heat in the carbon dioxide compressor
Implementation Method 2
providing a flow of high-pressure hydrogen generated by a high-pressure electrolyser
Implementation Method 3
The high-pressure hydrogen generated by the high-pressure electrolyser and the compressed and heated oxygen-containing carbon dioxide stream are fed to an oxygen removal package, e.g. a catalytic oxidation reactor (CATOX reactor), where hydrogen and oxygen contained in the oxygen-containing carbon dioxide stream are reacted so as to remove oxygen
Data Source
AI summary
The method includes a step of compressing a gaseous oxygen-containing carbon dioxide stream and increasing the temperature thereof through compression, and a step of feeding the compressed and heated oxygen-containing carbon dioxide stream through an oxygen removal package and remove oxygen therefrom, such that the temperature achieved by compression is used for promoting an oxygen removal reaction in the oxygen removal package. The carbon dioxide stream, wherefrom oxygen has been removed, is then cooled for further processing. Further disclosed is a system for performing the above outlined method.