Membrane CO2 Capture for Plant Growth
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Solution Overview
Problem
Current systems for capturing carbon dioxide from flue gas are energy-intensive, costly, and contribute to greenhouse gas emissions, making them economically unfeasible for large-scale carbon sequestration, while natural sequestration methods like plant biomass are desirable but need enhancement.
Innovation Solution
A membrane-based system captures CO2 from flue gas, cools, dilutes, and concentrates it for distribution to plants, using a gas distribution network with membrane modules and quenching towers to optimize temperature and concentration, promoting plant growth and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional CO2 capture systems (absorption, adsorption, cryogenic distillation, membrane separation) are used to remove CO2 from flue gas, then CO2 capture efficiency is improved, but energy consumption and operational costs increase significantly
Solution Approach 1:
The patent extracts only the CO2 component from flue gas using selective membrane filtration, separating it from other flue gas components (N2, O2, H2O, etc.). This extraction approach avoids the energy-intensive processes of conventional methods by utilizing the natural selective permeability of membrane materials to CO2, allowing CO2 to pass through while other gases are retained or allowed to vent naturally.
Solution Approach 2:
The patent replaces mechanical/thermal separation systems (absorption columns, adsorption beds, cryogenic distillation equipment) with a passive membrane-based separation system. The membrane system operates without moving parts, high temperatures, or high pressures, substituting complex mechanical infrastructure with thin-film selective barriers that rely on molecular diffusion and permeability differences.
2Quantity of substance
If conventional CO2 capture systems are deployed at scale to remove 4 gigatons CO2 annually, then atmospheric CO2 removal is improved, but economic feasibility deteriorates due to costs reaching approximately $1 trillion dollars/year
Solution Approach 1:
The patent changes the operating parameters from extreme conditions (high pressure, low temperature for cryogenic distillation; high temperature for chemical absorption) to ambient or near-ambient conditions. The membrane system operates at low pressure differentials and moderate temperatures, dramatically reducing capital and operational costs while maintaining effective CO2 separation at the required scale.
Solution Approach 2:
The patent employs inexpensive membrane materials and modular membrane units that can be deployed extensively across multiple flue gas sources. Rather than investing in expensive, complex capture facilities at each location, the system uses affordable, replaceable membrane modules that can be installed in parallel to achieve gigaton-scale CO2 removal through distributed deployment.
3Device complexity
If flue gas is directly vented to atmosphere, then system complexity is reduced, but CO2 emissions and contribution to global warming increase
Solution Approach 1:
The patent introduces membrane modules as an intermediary component between the flue gas source and the atmosphere. These membranes act as selective mediators that allow CO2 to be separated and directed to beneficial uses (plant growth enhancement, industrial applications) while other flue gas components can be safely vented or reused, transforming a harmful emission stream into a valuable resource.
Solution Approach 2:
The patent converts the harmful CO2 emissions from flue gas into a beneficial product for plant growth and agricultural productivity. By capturing CO2 that would otherwise be wasted or harmful, the system creates value through enhanced photosynthesis, increased crop yields, and reduced greenhouse gas emissions, turning an environmental problem into an economic and ecological opportunity.
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 system efficiently captures and sequesters CO2 without additional greenhouse gas emissions, enhancing plant growth and productivity while reducing atmospheric CO2 levels at a lower cost, leveraging natural sequestration methods.
Implementation Method 1
A membrane system is utilized to separate the CO2 from other components and, if desired, to concentrate the CO2
Implementation Method 2
cooling and condensing the CO2 rich gas mixture to a temperature and pressure suitable for distribution among the plants
Implementation Method 3
application of the gas to the plants promotes growth in the plant, such that the plant has more robust root and shoot systems
Data Source
AI summary
A flue gas extraction system provides extraction, collection, cooling, enriching and distributing flue gas from a vent stack of a stationary flue gas generator to carbon dioxide consuming crops, orchards, and other photosynthetic organisms. The collected flue gas is processed through the system to achieve optimal temperature, pressure, flowrate, water content and carbon dioxide concentration for application to plants for increasing plant productivity and sequestering the carbon dioxide. The gas distribution network may have one or more membrane modules which receive a low pressure gas mixture, where the membrane modules are utilized to enrich the CO2 concentration and to separate out a nitrogen rich component from the flue gas. Application of carbon dioxide may be supplemented by providing additional components to the plants which maintain a level of fertilization and irrigation suitable for the increased biomass and water utilization efficiency of the plants resulting from the increased intake of carbon dioxide.