Modular CO2 Separation Layout With Integrated Drying and Recirculation
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Solution Overview
Problem
Existing carbon dioxide capture systems face inefficiencies due to environmental conditions, material degradation, and high operational costs, particularly when using amine-based chemisorbents and zeolites, and are limited by the availability of renewable energy sources.
Innovation Solution
A modular system design with multiple functional units, including a preconditioning unit, drying unit, and sorption unit, optimized for minimal flow resistance and energy efficiency, using physisorbents like zeolites, with a return line for gas recirculation and flexible module configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If amine-based chemisorbents are used to separate carbon dioxide, then carbon dioxide capture efficiency is improved, but material degradation occurs due to aging when exposed to oxygen at temperatures above 60°C
Solution Approach 1:
The patent applies the inert atmosphere principle by introducing water vapor into the desorption chamber to create an oxygen-free environment. This prevents oxidation of the amine-based chemisorbent material while allowing carbon dioxide to be effectively captured and desorbed at elevated temperatures around 100°C, thus resolving the contradiction between capture efficiency and material stability
2Productivity
If physisorbents like zeolites are used to separate carbon dioxide, then carbon dioxide capture capability is improved, but water vapor affinity is higher requiring complex and expensive air drying
Solution Approach 1:
The patent extracts water vapor from the gas stream by introducing it into the desorption chamber, where it selectively removes moisture from the physisorbent material. This allows the use of high-capacity physisorbents like zeolites without requiring complex external drying systems, as the water removal is integrated into the desorption process itself
3Reliability
If protective measures are taken to prevent amine-based chemisorbent degradation, then material stability is improved, but system complexity and cost increase
Solution Approach 1:
The patent merges the water vapor injection function with the desorption process, combining two operations into one integrated step. Water vapor serves dual purposes: creating an inert atmosphere to protect the chemisorbent from oxidation and facilitating carbon dioxide desorption, thereby preventing material degradation without adding separate protective systems
4Productivity
If air drying is performed before adsorption using physisorbents, then sorbent performance is improved, but operational cost and system complexity increase
Solution Approach 1:
The system performs self-service by using water vapor generated during the desorption phase to automatically dry the physisorbent material in subsequent cycles. This eliminates the need for separate energy-intensive drying systems before adsorption, maintaining high sorbent performance while significantly reducing operational costs
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
Enables efficient carbon dioxide separation with reduced power losses and installation space, utilizing renewable energy sources, and maintaining system performance even with partial module regeneration.
Implementation Method 1
The separation of carbon dioxide from ambient air can be achieved using various sorbents. Chemisorbents and/or physisorbents are typically used to separate carbon dioxide.
Implementation Method 2
Physisorbents, such as zeolites, have the problem that the affinity of the sorbent material for water (vapor) is higher than for carbon dioxide, which means that the ambient air must first be dried before being introduced into an adsorption chamber containing the zeolite material.
Data Source
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AI summary
The invention relates to a system (10) for separating carbon dioxide from a gas stream, in particular from an air stream. The system (10) comprises at least one first functional unit (11, 12, 14) and at least one second functional unit (12, 14, 16) downstream of the first functional unit (11, 12, 14) in the flow direction of a main air stream (58) through the system (10). It is provided that the first functional unit (11, 12, 14) has a first number (n) of functional modules (30, 32, 34) and the second functional unit (12, 14, 16) has a second number (m) of functional modules (32, 34), wherein the second number (m) is greater than the first number (n).