Carbon Dioxide Pretreatment Tower for Acid Gas-First Moisture Removal
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Solution Overview
Problem
Existing carbon dioxide collection facilities face challenges in maintaining low dew points and prolonged moisture adsorption performance due to the interaction of moisture and carbon dioxide with synthetic zeolite adsorbents, leading to reduced carbon dioxide adsorption efficiency.
Innovation Solution
A pre-treatment device is employed that includes a dehumidification tower with a moisture adsorbent containing alumina and an acid gas adsorbent containing silica or high-silica zeolite, where the exhaust gas is first passed through the acid gas adsorbent to remove acid gases before passing through the moisture adsorbent, thereby protecting the moisture adsorbent and maintaining its performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If synthetic zeolite is used as moisture adsorbent to remove moisture from exhaust gas, then moisture removal capability is improved, but carbon dioxide adsorption efficiency decreases due to competition for adsorption sites
Solution Approach 1:
The dehumidification tower is divided into two separate sections: an acid gas removal section filled with acid gas adsorbent (activated carbon or silica gel) and a dehumidification section filled with moisture adsorbent (synthetic zeolite). This segmentation allows acid gases to be removed first, preventing them from reaching and blocking the moisture adsorbent, thereby maintaining both moisture removal capability and carbon dioxide adsorption efficiency in the subsequent collection device.
Solution Approach 2:
Acid gas removal is performed as a preliminary action before moisture removal. The exhaust gas passes through the acid gas adsorbent first to remove acid gases, and only then enters the moisture adsorbent section. This preliminary action prevents acid gases from interfering with the moisture adsorption process and protects the moisture adsorbent from deactivation.
2Productivity
If moisture adsorbent is exposed to acid gas to remove moisture from exhaust gas, then moisture adsorption performance is improved initially, but the adsorbent performance deteriorates over time due to acid gas binding
Solution Approach 1:
Acid gas removal is performed as a preliminary action before moisture removal. The exhaust gas passes through the acid gas adsorbent first to remove acid gases, and only then enters the moisture adsorbent section. This preliminary action prevents acid gases from interfering with the moisture adsorption process and protects the moisture adsorbent from deactivation.
Solution Approach 2:
An acid gas adsorbent (activated carbon or silica gel) is introduced as an intermediary substance between the exhaust gas and the moisture adsorbent. This intermediary captures acid gases through chemical adsorption, preventing them from reaching the moisture adsorbent and causing irreversible binding that would reduce its service life.
3Productivity
If dew point of pretreated gas is lowered to improve carbon dioxide adsorption, then carbon dioxide adsorption efficiency is improved, but moisture adsorbent performance degrades faster due to continuous exposure to acid gas
Solution Approach 1:
The dehumidification tower is divided into two separate sections: an acid gas removal section filled with acid gas adsorbent (activated carbon or silica gel) and a dehumidification section filled with moisture adsorbent (synthetic zeolite). This segmentation allows acid gases to be removed first, preventing them from reaching and blocking the moisture adsorbent, thereby maintaining both moisture removal capability and carbon dioxide adsorption efficiency in the subsequent collection device.
Solution Approach 2:
An acid gas adsorbent (activated carbon or silica gel) is introduced as an intermediary substance between the exhaust gas and the moisture adsorbent. This intermediary captures acid gases through chemical adsorption, preventing them from reaching the moisture adsorbent and causing irreversible binding that would reduce its service life.
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 lowers the dew point of the gas, reducing moisture concentration and enhancing the carbon dioxide adsorption efficiency in the carbon dioxide collection device by preserving the moisture adsorbent's performance over time.
Implementation Method 1
an acid gas adsorbent capable of adsorbing an acid gas
Implementation Method 2
a moisture adsorbent capable of adsorbing moisture
Data Source
AI summary
A pre-treatment device capable of removing moisture from an exhaust gas containing moisture, carbon dioxide, and an acid gas before treatment in a carbon dioxide collection device, includes: a dehumidification tower capable of removing moisture from the exhaust gas; and a blower capable of sending the exhaust gas into the dehumidification tower. The dehumidification tower includes a moisture adsorbent capable of adsorbing moisture, an acid gas adsorbent capable of adsorbing an acid gas, and a dehumidification container filled with the moisture adsorbent and the acid gas adsorbent. The dehumidification container includes a first port into which the exhaust gas from the blower is able to flow and a second port from which a gas having passed through the moisture adsorbent and the acid gas adsorbent is able to flow out as a pretreated gas.