Multi-section Column for Sorption-Enhanced Hydrogen Production
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Solution Overview
Problem
Current hydrogen production methods, such as steam methane reforming and coal-based processes, face challenges in achieving high-purity hydrogen while minimizing impurities and maximizing yield, particularly due to the inefficiencies in the sorption-enhanced water-gas shift (SE-WGS) reaction.
Innovation Solution
A multi-section column apparatus is used for the SE-WGS reaction, with varying catalyst to adsorbent ratios in different sections to optimize the sorption-enhanced water-gas shift process, allowing for efficient removal of carbon dioxide by-products and increased hydrogen production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional WGS reaction with condensation and PSA separation is used, then high-purity hydrogen can be obtained, but 10-25% of hydrogen is consumed and waste gases including large quantity of carbon dioxide are produced
Solution Approach 1:
The patent combines the WGS reaction and CO2 separation into a single integrated reactor system. The sorbent material performs both CO2 absorption during the reaction and acts as a catalyst support, eliminating the need for separate condensation and PSA units. This integration prevents hydrogen loss by avoiding multiple separation steps where hydrogen is consumed or vented.
Solution Approach 2:
The patent uses temperature swing to control the sorbent's CO2 absorption capacity. During the reaction phase at lower temperature, the sorbent absorbs CO2. During regeneration at higher temperature, the sorbent releases CO2. This parameter change allows continuous operation without consuming hydrogen in separation processes.
2Manufacturing precision
If conventional WGS reaction with condensation and PSA separation is used, then high-purity hydrogen can be obtained, but waste gases including large quantity of carbon dioxide are produced
Solution Approach 1:
The patent converts the harmful CO2 by-product into a useful function by using it to regenerate the sorbent. The CO2 that would normally be wasted is instead used to displace absorbed CO2 during the temperature swing regeneration process, creating a closed-loop system that minimizes harmful emissions while maintaining high hydrogen purity.
3Device complexity
If SE-WGS reaction with single ratio of catalyst and adsorbent is used, then the process is simplified, but hydrogen production yield is limited
Solution Approach 1:
The patent divides the reactor into multiple zones with different catalyst-to-adsorbent ratios. The first zone has a higher catalyst ratio to maximize WGS reaction rate, while the second zone has a higher adsorbent ratio to maximize CO2 removal efficiency. This segmentation allows each zone to perform its primary function optimally, increasing overall hydrogen production yield while maintaining relatively simple reactor structure.
Solution Approach 2:
The patent applies different local compositions of catalyst and adsorbent in different reactor zones based on local requirements. The upstream zone requires more catalyst for rapid CO conversion, while the downstream zone requires more adsorbent for complete CO2 removal. This local quality optimization maximizes hydrogen production throughout the entire reactor without significantly increasing overall system complexity.
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 enhances hydrogen production yield by up to 6.3% compared to conventional SE-WGS methods, reduces operational costs, and maintains high-purity hydrogen levels suitable for fuel cell applications without the need for separate refining processes.
Implementation Method 1
a catalyst reaction
Implementation Method 2
the reaction by-product of carbon dioxide can be removed by sorption
Data Source
Figure 1~3(b)
Figure 4~6
Figure 7~9
AI summary
The present invention relates to an apparatus that produces a high-purity gas and to a method of producing a high-purity gas using the apparatus. An apparatus for producing a high-purity gas according to an embodiment of the invention may include a column configured to perform a sorption-enhanced reaction for removing a reaction by-product produced through a catalyst reaction by using sorption, where the column is divided into a multiple number of sections, and the multiple sections have decreasing proportions of a catalyst and increasing proportions of an adsorbent from a front end towards a rear end along a reaction path. According to an embodiment of the invention, a multi-section column may be applied to obtain an increased amount of gas production compared with the conventional sorption-enhanced reaction, even with the same amounts of catalyst and adsorbent.