CO₂ Dehydration Using Integrated Refrigeration for Reduced Power
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Solution Overview
Problem
Existing CO2 dehydration processes require significant power for cooling duties, necessitating a reduction in power requirements through improved heat integration.
Innovation Solution
The process integrates partial condensation and temperature swing adsorption to dehydrate CO2 streams, utilizing heat exchangers and refrigeration streams to optimize heat integration and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling methods are used to cool the CO2 stream, then the CO2 can be condensed and dehydrated, but the power requirements increase significantly
Solution Approach 1:
The patent combines the cooling function with the refrigeration cycles already present in the CO2 purification system. The refrigeration cycles serve dual purposes: producing cold CO2 for purification and providing cooling duty for the feed stream, thereby merging two separate cooling functions into one integrated system.
Solution Approach 2:
The system uses its own internal refrigeration cycles to provide the cooling duty required for CO2 stream treatment. The cold CO2 streams generated during purification serve as refrigerants to cool the feed stream, allowing the system to cool itself without external power-intensive cooling equipment.
2Use of energy by moving object
If external refrigeration systems are added to reduce cooling power requirements, then energy efficiency improves, but device complexity increases
Solution Approach 1:
The existing refrigeration cycles in the CO2 purification system are made multi-functional by having them perform both their original purification function and the additional function of cooling the feed stream. This eliminates the need for separate external refrigeration systems while maintaining energy efficiency.
Solution Approach 2:
The system leverages its own internal cold streams and refrigeration cycles to provide cooling duty, avoiding the addition of external refrigeration equipment. The cold CO2 streams produced during purification serve as self-generated refrigerants for cooling the feed.
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 effectively reduces the power requirements for CO2 dehydration by leveraging efficient heat integration and refrigeration strategies, leading to a more energy-efficient CO2 purification process.
Implementation Method 1
cooling and partially condensing the carbon dioxide feed stream to a first temperature to produce a cooled carbon dioxide stream
Implementation Method 2
passing the overhead vapor stream through an online adsorber to produce a dry carbon dioxide stream
Implementation Method 3
the carbon dioxide feed is cooled by one or more of at least a portion of the cold carbon dioxide liquid stream
Implementation Method 4
expanding at least a portion of the cold carbon dioxide liquid stream to produce a low-pressure carbon dioxide stream
Data Source
AI summary
A method and system for purifying a carbon dioxide feed stream in which the carbon dioxide feed stream is cooled and partially condensed to remove water upstream of an adsorber to produce a dry carbon dioxide stream. The dry carbon dioxide stream is further cooled and partially condensed in a carbon dioxide purification unit to form a carbon dioxide product stream. Excess refrigeration duty from the carbon dioxide purification unit is used to cool the carbon dioxide feed stream.