Fuel Cell CO Oxidation with Calcined Carbonate Feedstock
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Solution Overview
Problem
Current energy generation methods, including traditional combustion and fuel cell technologies, face limitations such as geography-dependent renewable sources, harmful by-product emissions, and high greenhouse gas emissions, particularly from calcination processes like limestone calcination, which contribute significantly to global carbon dioxide emissions.
Innovation Solution
A process involving the oxidation of carbon monoxide to carbon dioxide in a fuel cell, specifically adapted for Solid Oxide Fuel Cells and Molten Carbonate Fuel Cells, which generates energy through an exothermic reaction, and includes steps of calcining metal carbonates, reversing the Boudouard reaction, and using hydrocarbons to produce carbon monoxide, all while capturing and sequestering carbon dioxide to achieve a carbon-neutral or carbon-negative energy generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional combustion methods are used for energy generation, then energy can be produced in various locations, but harmful by-products such as carbon dioxide are released
Solution Approach 1:
The invention captures carbon dioxide produced during limestone calcination and uses it as a feedstock for microbial fermentation to produce ethanol. This converts the harmful CO2 emissions into a valuable energy carrier, eliminating the negative environmental impact while maintaining the flexibility of chemical-based energy generation in various locations
Solution Approach 2:
Instead of discarding CO2 as waste product from calcination, the invention recovers and utilizes it as a substrate for microbial conversion to ethanol. The CO2 that would normally be released to atmosphere is captured and transformed into a useful energy source, resolving the contradiction between energy production flexibility and harmful emissions
2Productivity
If limestone calcination is performed to produce lime, then lime is obtained, but significant carbon dioxide emissions are released to atmosphere
Solution Approach 1:
The invention captures CO2 from limestone calcination that would otherwise be discarded to atmosphere and recovers it as a valuable feedstock for ethanol production. This maintains high lime production efficiency while converting the harmful CO2 emissions into a useful energy carrier
Solution Approach 2:
The CO2 emissions from lime production are transformed from a harmful by-product into a beneficial resource for microbial fermentation. The calcination process that produces CO2 also provides the substrate for ethanol synthesis, turning an environmental problem into a solution
3Adaptability or versatility
If carbon monoxide is used as fuel in conventional fuel cells, then the fuel cell cannot operate due to poisoning, but Solid Oxide Fuel Cells and Molten Carbonate Fuel Cells can utilise carbon monoxide
Solution Approach 1:
The invention changes the operating parameters of the fuel cell by using Solid Oxide Fuel Cells or Molten Carbonate Fuel Cells that operate at high temperatures and are tolerant to carbon monoxide. This parameter change allows the system to use CO-rich syngas from biomass gasification as fuel without suffering from CO poisoning that plagues conventional low-temperature fuel cells
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 process provides a clean, efficient, and scalable energy generation method that reduces greenhouse gas emissions, produces pure carbon dioxide for easy sequestration, and generates energy with high efficiency, potentially becoming carbon negative through recarbonation of metal oxides, thus addressing the need for clean and sustainable energy.
Implementation Method 1
The invention relates to an energy generation process, in particular to energy generation using fuel cells... comprising the oxidation of carbon monoxide (CO) to carbon dioxide
Implementation Method 2
The oxidation of carbon monoxide to carbon dioxide is an exothermic reaction, releasing 283 kJ of energy per mol of CO reacted
Implementation Method 3
The process may include an additional step of forming carbon monoxide from carbon dioxide and carbon in a reverse Boudouard reaction... calcining metal carbonates
Implementation Method 4
forming carbon monoxide from carbon dioxide and carbon in a reverse Boudouard reaction... CO2 + C → 2CO
Data Source
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AI summary
An energy generation process comprising the oxidation of carbon monoxide to carbon dioxide in a fuel cell, the process comprising the step of producing the carbon monoxide from carbon dioxide and carbon and/or a hydrocarbon, and the step of producing the carbon dioxide from the calcination of a metal carbonate, together with an apparatus for use in energy generation comprising a calcination unit in fluid communication with the fuel cell and the use of the apparatus in energy generation.