Catalytic Gasifier Methane Production Without Recycle Loops
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Solution Overview
Problem
Current methane production methods through catalytic gasification of carbonaceous feedstocks require complex gas recycle loops, increasing engineering complexity and cost due to the need for separate recycling of carbon monoxide and hydrogen.
Innovation Solution
A process that eliminates gas recycle loops by using an oxygen-blown gasifier to generate carbon monoxide and hydrogen, which are then used in a catalytic gasifier with a carbonaceous feedstock and catalyst to produce methane, followed by optional methanation steps to enhance methane production, without the need for separate superheating or additional heating elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If gas recycle loops are used to maintain thermal balance in catalytic gasification, then the reaction can be kept near thermally neutral, but the engineering complexity and cost increase due to additional heating elements, pressurization elements, and separation equipment
Solution Approach 1:
The patent extracts and eliminates the gas recycle loop from the catalytic gasification system. By removing the recycle of CO and H2 gases, the system avoids the complexity of heating elements, pressurization elements, and separation equipment while maintaining process feasibility through alternative thermal management approaches.
Solution Approach 2:
The patent makes the catalytic gasifier multi-functional by combining the gasification reaction and methanation reaction in a single reactor. This eliminates the need for separate heating and separation processes required in conventional systems with gas recycle loops, thereby reducing engineering complexity while maintaining thermal balance.
2Stability of the object's composition
If gas recycle loops are implemented for methane production, then thermal balance can be maintained, but the overall cost of producing methane increases due to additional equipment and processing steps
Solution Approach 1:
The patent removes the gas recycle loop and associated equipment (heating elements, pressurization elements, separation equipment), directly reducing the capital and operating costs of methane production while maintaining process feasibility through integrated reaction design.
Solution Approach 2:
The patent combines the gasification and methanation processes into a single catalytic gasifier reactor, eliminating the need for separate heating and separation processes. This integration reduces equipment costs, operating costs, and overall methane production expenses.
3Manufacturing precision
If separate heating and separation processes are used in conventional gasification, then thermal balance and product purity can be achieved, but the engineering complexity and overall cost are greatly increased
Solution Approach 1:
The catalytic gasifier performs multiple functions simultaneously: gasification of carbonaceous feedstock, methanation of CO and H2, and thermal balance maintenance. This multi-functionality eliminates the need for separate heating and separation processes, reducing engineering complexity while maintaining product purity through catalytic selectivity.
Solution Approach 2:
The patent merges the gasification and methanation reactions in a single reactor with a sulfur-tolerant catalyst, combining what were previously separate heating and separation processes into one integrated unit, thereby simplifying the overall system while achieving the desired product purity.
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 simplifies the methane production process, reduces costs, and achieves a high-quality methane product stream by eliminating the complexity of gas recycle loops and minimizing the use of additional heating elements.
Implementation Method 1
at least partially combusting the first carbonaceous feedstock with the oxygen-rich gas stream in the oxygen-blown gasifier
Implementation Method 2
reacting the second carbonaceous feedstock and the first gas stream in the catalytic gasifier in the presence of the gasification catalyst
Data Source
AI summary
The present invention relates to processes and continuous processes for preparing gaseous products, and in particular, methane via the catalytic gasification of carbonaceous feedstocks in the presence of steam. In one aspect of the invention, the processes comprise at least partially combusting a first carbonaceous feedstock with an oxygen-rich gas stream in an oxygen-blown gasifier, under suitable temperature and pressure, to generate a first gas stream comprising hydrogen, carbon monoxide and superheated steam; and reacting a second carbonaceous feedstock and the first gas stream in a catalytic gasifier in the presence of a gasification catalyst under suitable temperature and pressure to form a second gas stream comprising a plurality of gaseous products comprising methane, carbon dioxide, hydrogen, carbon monoxide and hydrogen sulfide. The processes can comprise using at least one catalytic methanator to convert carbon monoxide and hydrogen in the gaseous products to methane and in certain embodiments do not recycle carbon monoxide or hydrogen to the gasifier.