CO2 Conversion System with Integrated RWGS-FTS Thermal Balance
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Solution Overview
Problem
Existing carbon dioxide conversion methods are inefficient in terms of energy and carbon reduction, and they require additional equipment and processes to control the calorific value of synthetic natural gas for connection to LNG city gas pipelines.
Innovation Solution
A carbon dioxide conversion system that includes a first reaction part for performing reverse water gas shift and Fischer-Tropsch synthesis reactions, a separation part to separate C5+ hydrocarbons from lower hydrocarbons and unconverted reactants, a recycle part to recycle unreacted materials back to the reaction part, and a second reaction part to produce synthetic natural gas by adding hydrogen to the recycled materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If carbon dioxide is converted through RWGS and FTS reactions with recycling of unreacted CO2, then carbon efficiency and hydrocarbon selectivity are improved, but energy efficiency deteriorates due to the endothermic nature of RWGS reaction requiring continuous energy input
Solution Approach 1:
The patent combines the endothermic RWGS reaction and exothermic FTS reaction into a single integrated reaction system where the exothermic heat from FTS reaction is used to supply the endothermic heat requirement of RWGS reaction, eliminating the need for external energy input and improving overall energy efficiency while maintaining high carbon efficiency through CO2 recycling
Solution Approach 2:
The system uses the heat generated from the FTS reaction to self-supply the energy required for the RWGS reaction, creating a self-sustaining thermal balance where the reaction system serves its own energy needs without external energy input
2Productivity
If conventional CO2 conversion processes are used, then hydrocarbons can be produced, but additional equipment and processes are required to control calorific value for connection to LNG city gas pipelines
Solution Approach 1:
The patent adjusts the reaction conditions and catalyst composition to control the product distribution and calorific value of the produced hydrocarbons, enabling direct connection to LNG city gas pipelines without requiring additional calorific value control equipment or processes
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 system improves energy efficiency and carbon yield, reduces carbon dioxide emissions, and produces synthetic natural gas with a calorific value similar to city gas, allowing direct connection to LNG city gas pipelines without additional calorific value control processes.
Implementation Method 1
the conversion reaction of carbon dioxide consists of a first step in which carbon dioxide supplied as a reactant is converted into carbon monoxide through a reverse water gas shift (RWGS) reaction
Implementation Method 2
a second step in which the resulting carbon monoxide is converted into hydrocarbons by bonding with hydrogen through a Fischer-Tropsch synthesis (FTS) reaction
Data Source
AI summary
Proposed is a carbon dioxide conversion system and method. More particularly, proposed is an eco-friendly carbon dioxide conversion system and method, the system and the method returning, in the recycling of Fischer-Tropsch synthesis reaction off-gas, a part of the off-gas to a Fischer-Tropsch reactor and producing a synthetic natural gas through methanation of the remainder of the off-gas, thereby improving overall energy efficiency and carbon efficiency, and thus a useful hydrocarbon fuel is produced from carbon dioxide, thereby providing a carbon dioxide-reducing effect.