Gasification Process for Synthetic Fuels with H2:CO Ratio Control
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Solution Overview
Problem
Conventional gasification processes for producing synthetic fuels from waste and biomass lack control over the molar hydrogen to carbon monoxide ratio, leading to high carbon intensity and greenhouse gas emissions, and often require costly water gas shift reactions.
Innovation Solution
A process that combines hydrogen-rich synthesis gas from renewable natural gas with hydrogen-lean synthesis gas from waste or biomass, allowing for independent control of the H2:CO ratio without a water gas shift reaction, using gasification and reforming units to achieve the desired ratio for Fischer-Tropsch synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional gasification processes are used to produce synthesis gas from waste and biomass, then useful products such as synthetic fuels can be manufactured, but the molar hydrogen to carbon monoxide ratio cannot be controlled, leading to high carbon intensity and greenhouse gas emissions
Solution Approach 1:
The patent combines two separate gasification streams: one producing hydrogen-rich synthesis gas (with H2:CO ratio > 2.5) and another producing hydrogen-lean synthesis gas (with H2:CO ratio < 2.0). By merging these streams in controlled proportions, the process achieves precise control over the final H2:CO ratio while reducing carbon intensity and eliminating the need for water-gas shift reactions
Solution Approach 2:
The patent changes the operational parameters of two parallel gasification processes to produce synthesis gases with deliberately different H2:CO ratios. By adjusting parameters such as steam-to-carbon ratio, oxygen-to-carbon ratio, and process temperature in each stream, the system can independently control the composition of each gas stream before combination, thereby achieving precise control over the final synthesis gas composition
2Manufacturing precision
If water gas shift reactions are used to adjust the H2:CO ratio in synthesis gas, then the desired ratio for Fischer-Tropsch synthesis can be achieved, but costly downstream processing is required
Solution Approach 1:
The patent performs the H2:CO ratio adjustment in advance, during the gasification stage itself, by controlling the operational parameters of the gasification process and combining streams with different ratios. This preliminary adjustment eliminates the need for subsequent water-gas shift reactions and associated downstream processing equipment
Solution Approach 2:
The patent extracts and eliminates the water-gas shift reaction step from the conventional synthesis gas production pathway. By achieving the desired H2:CO ratio directly through controlled gasification and stream combination, the system removes the unnecessary downstream processing step and associated equipment complexity
3Ease of operation
If a single gasification process is used to produce synthesis gas, then the process is simpler, but the H2:CO ratio cannot be optimized for specific chemical reactions
Solution Approach 1:
The patent implements a dynamic system where the ratio of hydrogen-rich to hydrogen-lean synthesis gas streams can be adjusted in real-time based on the specific requirements of the downstream chemical reaction. This dynamic control allows optimization of the H2:CO ratio for different applications (e.g., Fischer-Tropsch synthesis requiring ~2:1 ratio) while maintaining operational flexibility and relatively simple process configuration
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 approach reduces carbon intensity, optimizes feed ratios, and eliminates the need for costly downstream processing, enabling the production of environmentally friendly synthetic fuels with consistent quality and reduced greenhouse gas emissions.
Implementation Method 1
gasifying a first carbonaceous feedstock comprising waste materials and/or biomass in a gasification zone to produce a first synthesis gas
Implementation Method 2
reforming a second carbonaceous feedstock to produce a second synthesis gas, in which reforming the carbon monoxide content and the hydrogen content are both increased
Implementation Method 3
optionally partially oxidising the first synthesis gas in a partial oxidation zone to generate partially oxidised first synthesis gas
Implementation Method 4
subjecting at least part of the combined synthesis gas to a conversion or separation process effective to produce the useful product
Data Source
AI summary
The present invention provides a process for the manufacture of a useful product from synthesis gas having a desired hydrogen to carbon monoxide molar ratio comprising: gasifying a first carbonaceous feedstock comprising waste materials and/or biomass in a gasification zone to produce a first synthesis gas; optionally partially oxidising the first synthesis gas in a partial oxidation zone to generate oxidised synthesis gas; reforming a second carbonaceous feedstock to produce a second synthesis gas, the second synthesis gas having a different hydrogen to carbon ratio from that of the first raw synthesis gas; combining at least a portion of the first synthesis gas and at least a portion of the second synthesis gas in an amount to achieve the desired hydrogen to carbon molar ratio and to generate a combined synthesis gas and subjecting at least part of the combined synthesis gas to a conversion process effective to produce the useful product. The reforming step enables the conventional water gas shift reaction to be dispensed with.