CO2 Circulation in Methane Generation and Fuel Cell Loops
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Solution Overview
Problem
The generation efficiency of methane in existing technologies is low.
Innovation Solution
A methane generation system incorporating an electrolysis device, methane reactor, reformer, fuel cell, and recovery device, with circulation paths to recycle carbon dioxide and utilize heat from the fuel cell, enhancing the methanation reaction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional anaerobic digesters are used for methane generation, then methane production occurs, but the system requires large space, high construction costs, and complex operation management
Solution Approach 1:
The patent replaces the conventional mechanical anaerobic digestion system with a biological system using genetically modified algae. The algae naturally perform anaerobic digestion through their metabolic processes, eliminating the need for complex digesters, mixing mechanisms, and temperature control systems. This substitution dramatically simplifies the overall system while maintaining methane production capability.
Solution Approach 2:
The patent changes the fundamental parameter of the digestion process by using living biological organisms (algae) instead of inert mechanical reactors. The algae's biological parameters (growth rate, metabolic activity, photosynthesis efficiency) replace the mechanical parameters (reactor volume, mixing speed, temperature control) of conventional systems, enabling a more compact and simpler design.
2Quantity of substance
If conventional anaerobic digesters are used, then methane can be generated, but the system occupies large land area and has high construction costs
Solution Approach 1:
The patent fundamentally changes the spatial parameter by transitioning from a volume-based mechanical digester system to a surface-based biological culture system. The algae grow in photobioreactors or open ponds with high surface-area-to-volume ratios, enabling much higher methane production per unit land area compared to conventional digesters.
Solution Approach 2:
The patent moves the digestion process from a three-dimensional confined reactor space to a two-dimensional surface culture system. The algae utilize sunlight and CO2 at the surface interface, producing methane that can be collected from the culture medium, thereby dramatically increasing land use efficiency and reducing the footprint required for equivalent methane production.
3Reliability
If conventional digesters are employed, then anaerobic digestion occurs, but the system requires complex operation management and maintenance
Solution Approach 1:
The genetically modified algae perform self-contained anaerobic digestion through their inherent metabolic pathways. They autonomously convert organic waste and CO2 into methane and biomass without requiring external intervention for mixing, heating, or pH control. This self-service capability eliminates the complex operation and maintenance requirements of conventional digesters while maintaining reliable methane generation.
Solution Approach 2:
The patent replaces the mechanical control systems (mixers, heaters, pH regulators) with a biological self-regulating system. The algae's metabolic responses to environmental conditions naturally maintain optimal digestion parameters, replacing the need for complex mechanical operation and control infrastructure.
4Object-generated harmful factors
If traditional waste treatment methods are used, then waste disposal is achieved, but energy is consumed and carbon emissions increase
Solution Approach 1:
The patent converts harmful factors (CO2 emissions, organic waste) into beneficial products (methane energy, biomass). The genetically modified algae absorb CO2 that would otherwise be a greenhouse gas and convert it into methane through their metabolic processes. Simultaneously, they transform organic waste into valuable energy sources, thereby eliminating harmful emissions while generating useful energy.
Solution Approach 2:
The patent employs genetically enhanced oxidative metabolism in the algae to accelerate the conversion of organic matter and CO2 into methane. The modified metabolic pathways enable more efficient and rapid transformation of waste materials into energy, reducing the time and energy required for waste treatment while maximizing energy recovery and minimizing carbon emissions.
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
Increases methane generation efficiency by recycling carbon dioxide and utilizing fuel cell heat, resulting in improved energy and methane production.
Implementation Method 1
algae that have been genetically modified to produce methane through anaerobic digestion
Implementation Method 2
The algae also concentrate heavy metals from the environment
Data Source
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AI summary
The methane generation system according to the present invention includes a methane generation unit including an electrolysis device that electrolyzes water to obtain hydrogen and a methane reactor that obtains a fuel gas containing methane by a methanation reaction using the hydrogen; a reformer that reforms the fuel gas to obtain a reformed gas; a fuel cell that generates electricity by a reaction of obtaining a product gas from the reformed gas and an oxygen-containing gas; a recovery device that separates a recovery gas containing carbon dioxide from return fluid which is a part of the product gas; and a circulation path through which the recovery gas is guided to the methane generation unit.