CO2 to Graphite Conversion via Plasma Arc
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Solution Overview
Problem
Conventional methods for reducing CO2 levels in the atmosphere, such as sequestration or capture followed by injection underground, are expensive and temporary, with risks of CO2 re-emission due to seismic activity.
Innovation Solution
A process that converts captured CO2 into solid carbon, primarily in the form of graphite, using a chemical reactor with a thermal plasma torch and hydrocarbon gas, such as methane, to generate hydrogen for reduction reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CO2 is sequestered underground, then CO2 levels in atmosphere are reduced, but CO2 may re-emerge due to seismic activity and the method is temporary
Solution Approach 1:
The invention changes the physical state of carbon from gaseous CO2 to solid graphite form through chemical reduction reactions. This phase change from gas to solid fundamentally alters the stability and permanence of carbon storage, preventing re-emission while maintaining underground storage benefits
Solution Approach 2:
The process utilizes phase transition of carbon from gaseous state in CO2 to solid state as graphite. This phase transition locks carbon in a stable solid form that cannot easily return to atmospheric CO2, resolving the reliability issue of temporary sequestration
2Reliability
If CO2 is converted to solid carbon, then permanent removal from atmosphere is achieved, but high energy input is required for thermal plasma processing
Solution Approach 1:
The system recovers thermal energy from the hot product gases exiting the reactor and uses this recovered heat to preheat the incoming CO2 and hydrocarbon feeds. This self-service energy recovery reduces the net external energy input required for the endothermic reactions, partially offsetting the high energy consumption of plasma torch operation
Solution Approach 2:
The invention converts the high energy requirement, which is initially a disadvantage, into an opportunity to demonstrate efficient energy utilization. By implementing heat recovery systems, the process transforms what would be wasted thermal energy into a useful resource, turning the energy-intensive nature of plasma processing into a more sustainable operation
3Quantity of substance
If conventional steam reforming is used to generate H2, then H2 production is achieved, but multiple processing stages and purification steps are required
Solution Approach 1:
The invention merges the hydrogen production function and the CO2 reduction function into a single integrated reactor system. The plasma torch simultaneously generates the necessary hydrogen from hydrocarbon feeds and provides the reducing environment for converting CO2 to graphite, eliminating the need for separate steam reforming reactors, shift reactors, and purification trains
Solution Approach 2:
The plasma reactor performs multiple functions simultaneously: it acts as both a hydrogen generation device and a CO2 reduction reactor. The plasma environment provides high-temperature conditions for both hydrocarbon cracking to produce hydrogen and direct reduction of CO2 to graphite, making the system universal and multi-functional
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 method effectively stabilizes carbon underground, preventing its re-release into the atmosphere as a greenhouse gas, while also producing usable graphite for industrial applications.
Implementation Method 1
a first stage primary plasma arc heater configured to receive CH4 and generate C atoms and H atoms
Implementation Method 2
a second stage plasma arc heater configured to receive CO2 and the concentrated stream of H2 and generate C, O, and H atoms
Implementation Method 3
a first stage primary plasma arc heater configured to receive CH4 and generate C atoms and H atoms
Data Source
AI summary
Disclosed is a system and method related to removal of carbon from carbon dioxide via the use of plasma arc heating techniques. The method involves generating C atoms and H atoms from CxHy. The method involves generating graphite and H2 from the C atoms and H atoms, and extracting the graphite. The method involves quenching the H2 with CxHy. The method involves receiving, at a generator, the quenched the H2 and CxHy and generating electricity. The method involves generating a concentrated stream of H2 from the quenched H2 and CxHy. The method involves receiving CO2 and the concentrated stream of H2 and generating C, O, and H atoms. The method involves receiving the C, O, and H atoms and generating graphite, wherein the graphite is extracted. In the hydrocarbon CxHy: x is an integer 1, 2, 3, . . . , and y=2x+2.