Direct Air Capture Control for Moisture-Safe Sorbent Transitions
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Solution Overview
Problem
Existing carbon dioxide capture systems face inefficiencies and high costs due to material degradation and moisture retention issues during non-standard operating conditions, such as system start-up, shutdown, or malfunctions, which require laborious and expensive protective measures.
Innovation Solution
A method and system that differentiate between normal and special operations, employing measures like gas-tight closure, overpressure, and air circulation to precondition process spaces, reducing moisture retention and facilitating efficient transition to normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system operates in special operation modes (start-up, shutdown, downtime), then operational flexibility is improved, but material degradation and moisture retention increase
Solution Approach 1:
The system performs preliminary drying of the sorbent material and closure of process spaces before special operation modes begin, preventing moisture accumulation and material degradation in advance. This includes activating drying agents and sealing closures prior to transitions between operational states.
Solution Approach 2:
The system maintains an inert atmosphere in process spaces during special operation modes by using nitrogen or other inert gases to displace ambient air, preventing oxidation and degradation of sorbent materials during periods when normal carbon dioxide separation is not occurring.
2Reliability
If protective measures are implemented during desorption phase, then material degradation is reduced, but system complexity and cost increase
Solution Approach 1:
The system combines multiple protective functions into integrated components: closure elements that simultaneously seal process spaces and prevent moisture ingress, and drying agents that continuously maintain low humidity without requiring separate activation systems. The control unit integrates monitoring and control of multiple parameters in a unified system.
Solution Approach 2:
The drying agents automatically maintain appropriate humidity levels in process spaces without requiring external intervention or complex control systems. The closure elements automatically prevent moisture ingress when activated, providing self-protecting functionality that reduces the need for additional protective equipment.
3Productivity
If air drying is performed before carbon dioxide adsorption, then sorbent efficiency is improved, but energy consumption and process time increase
Solution Approach 1:
The drying agents continuously operate to maintain low humidity levels in process spaces throughout all operational states, eliminating the need for separate pre-drying steps before carbon dioxide adsorption. This continuous action ensures the sorbent material is always in optimal condition without requiring additional energy-intensive drying cycles.
Solution Approach 2:
The system performs preliminary drying of incoming ambient air through the drying agents before the air contacts the sorbent material in the sorption unit, ensuring the sorbent is always ready for efficient carbon dioxide adsorption without requiring separate pre-treatment steps during normal operation.
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
Enhances system efficiency by minimizing water retention and material degradation during non-standard conditions, allowing quicker and more efficient resumption of normal carbon dioxide separation.
Implementation Method 1
drying the stream of air in the first process space
Implementation Method 2
adsorbing carbon dioxide from the dried stream of air with a sorbent material in the second process space
Implementation Method 3
desorbing the carbon dioxide adsorbed in the sorbent material
Data Source
AI summary
The disclosure relates to a method for controlling a system for separating carbon dioxide from the ambient air. The method distinguishes between normal operation, in which carbon dioxide is separated from the ambient air, and special operation, which is not primarily used to separate carbon dioxide. Normal operation comprises conveying a stream of air of ambient air into a first process space of the system, wherein the stream of air is dried in the first process space. The dried stream of air of the ambient air is conducted from the first process space into a second process space, in which adsorption and subsequent desorption of carbon dioxide takes place. In the special operation mode, which takes place before or after normal operation, the system is operated with operating parameters that deviate from normal operation.