CO2 Pyrolysis Fuel Gas Production Without Separate Hydrogen
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Solution Overview
Problem
Existing methods for converting carbon dioxide into fuel gas are energy-intensive and economically unprofitable due to the high cost of hydrogen production, particularly through electrolysis, and existing fuel gas production plants are also energy-consuming.
Innovation Solution
A method involving the pyrolysis of carbon dioxide, octacosane, and carbon at temperatures between 700°C and 1000°C produces a fuel gas mixture of carbon monoxide, hydrogen, and methane, using a reactor with octacosane as the alkane, reducing the need for separate hydrogen production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If carbon dioxide is converted into fuel gas using existing methods (electrolysis for hydrogen production), then fuel gas can be produced, but the process becomes very energy-consuming and expensive
Solution Approach 1:
The invention changes the temperature parameter to extremely high levels (above 1000°C) to enable direct thermal decomposition of carbon dioxide and hydrocarbon reactions, eliminating the need for electrolysis and other energy-intensive intermediate processes. This parameter change transforms the conversion mechanism from electrochemical to thermal chemical, dramatically reducing energy consumption.
Solution Approach 2:
The invention extracts and eliminates the hydrogen production step (electrolysis) from the fuel gas production process. By directly producing synthesis gas through thermal reactions of carbon dioxide with hydrocarbons at high temperatures, the method removes the separate hydrogen production stage that consumes the most energy, achieving a more efficient direct conversion pathway.
2Quantity of substance
If carbon dioxide is converted into fuel gas using existing methods, then fuel gas can be produced, but the production cost becomes twice as expensive as other electricity production methods
Solution Approach 1:
By changing the temperature parameter to above 1000°C, the invention enables direct thermal conversion of carbon dioxide and hydrocarbons to synthesis gas, eliminating the need for expensive electrolysis equipment and hydrogen production facilities. This parameter change simplifies the manufacturing process and reduces capital and operational costs.
Solution Approach 2:
The invention replaces the electrochemical system (electrolysis) with a thermal chemical system (high-temperature pyrolysis and gasification). This substitution eliminates the need for electrical energy input for hydrogen production and replaces it with thermal energy from hydrocarbon combustion, which is more cost-effective and scalable.
3Quantity of substance
If carbon dioxide is converted into fuel gas using existing methods, then fuel gas can be produced, but separate hydrogen production is required which adds process complexity
Solution Approach 1:
The invention merges the carbon dioxide conversion process with the synthesis gas production process into a single integrated reactor system. By directly reacting carbon dioxide with hydrocarbons at high temperatures to produce synthesis gas containing hydrogen, carbon monoxide, and methane, the method eliminates the need for separate hydrogen production, purification, and mixing stages, significantly reducing process complexity.
Solution Approach 2:
The invention extracts and removes the separate hydrogen production step from the overall process flow. Instead of producing hydrogen separately through electrolysis and then combining it with carbon dioxide, the method directly produces synthesis gas in one step, simplifying the process architecture and reducing the number of required units and operations.
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
The method efficiently produces a fuel gas mixture that can be used for energy generation, such as in gas turbines, with methane as a viable and safer alternative to hydrogen, while reducing energy consumption and production costs.
Implementation Method 1
heating the reactor into a temperature for pyrolysis to take place, whereby a fuel gas containing carbon monoxide, hydrogen, and methane, is obtained as a reaction product
Data Source
AI summary
In the method of the invention, carbon dioxide is converted to a fuel gas. The method comprises the steps of feeding carbon dioxide, alkane, and carbon into a rector (3) and heating the reactor (3) to a temperature for pyrolysis to take place. A fuel gas containing carbon monoxide, hydrogen, and methane, is obtained as a reaction product, which is recovered in a gas container.