H2/CO Purification Adsorbent Skin Temperature Control
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Solution Overview
Problem
The existing adsorption processes for purifying H2/CO mixtures, such as syngas, face premature degradation due to chemical reactions and solid deposits, leading to reduced separation performance in cryogenic treatment, especially heat exchange deterioration, which shortens the operational lifespan of purification units.
Innovation Solution
A process that involves bringing the feed gas into contact with a first adsorbent to remove impurities, followed by regeneration with a gas heated to a skin temperature between 150° C. and 200° C., and using a regeneration temperature that is 5° C. to 50° C. lower than the skin temperature, with specific conditions for the adsorbents and regeneration gas composition to minimize undesirable reactions and extend adsorbent lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional TSA purification processes are used with high regeneration temperatures, then CO2 removal efficiency is improved, but chemical reactions and solid deposits form on the adsorbent, leading to premature degradation
Solution Approach 1:
The invention changes the regeneration temperature parameter from conventional high temperatures (400-600°C) to a lower range (150-250°C), and introduces a temperature gradient by heating from the bottom of the adsorber. This parameter modification prevents thermal degradation and chemical reactions while maintaining CO2 removal efficiency through extended adsorption time and optimized temperature profile.
Solution Approach 2:
The invention applies a preliminary cooling action before regeneration by extending the adsorption phase until the adsorbent temperature returns to initial values. This preliminary action prepares the adsorbent for low-temperature regeneration, preventing thermal shock and minimizing chemical reactions that would occur with sudden high-temperature heating.
2Measurement precision
If adsorption phase is extended to improve CO2 removal, then syngas quality is improved, but operational time increases and productivity decreases
Solution Approach 1:
The invention uses periodic temperature cycling with controlled adsorption and regeneration phases. The adsorption phase is extended until temperature return to initial values, creating a periodic rhythm that maximizes CO2 removal while maintaining consistent syngas quality. This periodic action optimizes the balance between purity and throughput.
Solution Approach 2:
The invention maintains continuous useful action by immediately transitioning from adsorption to regeneration without idle time. The extended adsorption phase is directly followed by low-temperature regeneration, ensuring the adsorber is continuously productive. This continuity compensates for the extended adsorption time and maintains overall system productivity.
3Productivity
If regeneration temperature is increased to enhance impurity removal, then adsorbent regeneration efficiency is improved, but undesirable chemical reactions are promoted
Solution Approach 1:
The invention fundamentally changes the regeneration temperature parameter from conventional high temperatures (400-600°C) to a lower range (150-250°C). This parameter change eliminates the thermal energy required for undesirable chemical reactions such as methanation and Boudouard reaction, while still achieving effective CO2 desorption through the temperature gradient and extended adsorption phase.
Solution Approach 2:
The invention converts the potential harm of extended adsorption time (reduced productivity) into a benefit by using it to cool the adsorbent to lower temperatures, which then enables low-temperature regeneration that prevents chemical reactions. The extended adsorption phase becomes a preparatory cooling step that benefits the regeneration process.
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 prevents or minimizes undesirable reactions, maintaining syngas quality and extending the operational lifespan of purification units by controlling the skin temperature and regeneration temperature difference, reducing the need for premature intervention.
Implementation Method 1
the feed gas stream is brought into contact with a first adsorbent for eliminating at least one impurity by adsorption
Implementation Method 2
a regeneration gas containing at least hydrogen (H2) and carbon monoxide (CO) is heated by means of a heater, the skin temperature (T1) of which is between 150° C. and 200° C. during the gas heating phase
Data Source
AI summary
The invention relates to a method for purifying or separating a supply gas flow containing at least one impurity, in which: a) said supply gas flow is contacted with a first adsorbent for the adsorption-removal of at least one said impurity; b) recovering said purified or separated gas; c) heating a regeneration gas containing at least hydrogen (H2) and carbon monoxide (CO) using a heater having a skin temperature (T1) of between 150° C. and 200° C. during the gas heating phase; and d) periodically regenerating the adsorbent of step a) with the regeneration gas heated during step c) at a regeneration temperature (T2) such that: T2=T1−ΔT with 5° C.<ΔT<50° C.