SOFC-DAC Energy Plant Using Waste Heat for Carbon-Negative Power
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Solution Overview
Problem
Conventional power plants that combust fossil fuels emit significant carbon dioxide, contributing to climate change. There is a need for technologies that can generate electricity with reduced or negative carbon emissions.
Innovation Solution
A dual-purpose energy plant system that integrates a solid oxide fuel cell (SOFC) system with a direct air capture (DAC) section. The SOFC system generates electricity by reacting hydrogen and compressed air, while also reforming hydrocarbon fuel to provide hydrogen. The DAC section captures carbon dioxide from the air using a CO2 adsorption device, and releases it in a carbon release mode using energy from the energy exchange path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional power plants combust fossil fuel to generate electricity, then power generation is achieved, but carbon emissions increase contributing to climate change
Solution Approach 1:
The patent combines a solid oxide fuel cell (SOFC) system with a direct air capture (DAC) system into an integrated power generation facility. The SOFC generates electricity while the DAC captures CO2 from ambient air, and the two systems are coupled through energy exchange where waste heat from the SOFC powers the DAC regeneration process, achieving both power generation and carbon removal simultaneously
Solution Approach 2:
The patent converts the harmful waste heat exhaust from the SOFC system into a beneficial resource by using it to provide thermal energy for the DAC CO2 release process. This transforms what would normally be discarded waste energy into a useful input that enables carbon capture operations without requiring additional external energy sources
2Object-generated harmful factors
If a DAC section is added to capture CO2 from air, then carbon emissions are reduced, but system complexity increases
Solution Approach 1:
The patent designs the SOFC system to serve multiple functions: it generates electricity through electrochemical conversion of fuel, produces waste heat that powers the DAC regeneration, and potentially provides other process heat needs. This multi-functionality reduces the need for separate dedicated systems and simplifies the overall plant configuration
Solution Approach 2:
The integrated system achieves self-service by using its own internally generated waste heat to power the DAC CO2 release process. The SOFC's exhaust heat automatically provides the thermal energy needed for DAC regeneration without requiring external fuel combustion or additional energy inputs, making the carbon capture process self-sustaining
3Loss of energy
If waste heat exhaust is used to provide thermal energy for CO2 release, then energy efficiency is improved, but temperature control becomes more challenging
Solution Approach 1:
The patent implements control systems that monitor the thermal energy requirements of the DAC regeneration process and adjust the coupling with the SOFC waste heat exhaust accordingly. This feedback mechanism ensures that the temperature and thermal energy input to the DAC are optimized for CO2 release while maintaining stable operation of the integrated system
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 achieves reduced or negative carbon emissions by capturing and releasing CO2 from the air, effectively mitigating climate change impacts while generating electricity.
Implementation Method 1
a SOFC fuel cell reactor having a fuel input for receiving hydrogen fuel and an air input for receiving compressed air, the fuel cell reactor being configured for reacting hydrogen and the compressed air for generating the electricity
Implementation Method 2
a reformer coupled to a hydrocarbon fuel supply and coupled to a heat output and a steam output of the fuel cell reactor, the reformer being configured for reforming the hydrocarbon fuel using heat and steam from the fuel cell reactor to provide the hydrogen fuel to the SOFC reactor
Implementation Method 3
a carbon dioxide (CO2) adsorption device having a CO2 adsorbent material; and a ventilator electrically coupled to the SOFC fuel cell reactor, the ventilator configured for flowing air through the CO2 adsorption device in a carbon capture mode
Implementation Method 4
a high-pressure compressor having a high-pressure output coupled to the air input of the SOFC fuel cell for compressing air provided to the SOFC reactor
Implementation Method 5
a combustor coupled to an output of the SOFC fuel cell reactor discharging unutilized fuel, the combustor being configured for combusting the unutilized fuel to provide an energy exchange path
Data Source
AI summary
A system for generating electricity with reduced or negative carbon emissions includes a power plant section having an electricity generating unit that includes a solid oxide fuel cell (SOFC) system. The SOFC system includes a SOFC fuel cell reactor and a combustor with an energy exchange path. The combustor is coupled to the fuel cell reactor to combust unutilized fuel. The system also includes a direct air capture (DAC) section having a carbon dioxide (CO2) adsorption device having a CO2 adsorbent material and a ventilator electrically coupled to the electric generator for flowing ambient air through the CO2 adsorption device in a carbon capture mode. The CO2 adsorption device is coupled to and in energy communication with the energy exchange path for releasing adsorbed CO2 in a carbon release mode.