Reformer Feed Composition for Hydrogen Production
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Solution Overview
Problem
Conventional steam methane reforming processes for hydrogen production are capital and operating cost intensive due to high endothermic heat loads, which can be mitigated by reducing or eliminating the need for external heat sources, allowing for the incorporation of renewable energy sources.
Innovation Solution
Introducing higher amounts of steam and carbon monoxide into the reformer feed to alter the endothermic nature of the process, potentially making it exothermic, thereby reducing the need for high-temperature furnaces and enabling the use of renewable energy sources for heat input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional steam methane reforming is used to produce hydrogen, then hydrogen can be generated from abundant natural gas resources, but the process requires high endothermic heat loads that increase capital and operating costs
Solution Approach 1:
The patent changes the chemical composition parameters of the reformer feed by introducing carbon monoxide and adjusting steam-to-methane ratios. This alters the reaction thermodynamics from highly endothermic to potentially exothermic, fundamentally changing the energy balance of the process while maintaining hydrogen production capability
Solution Approach 2:
Carbon monoxide is introduced as an intermediary substance that participates in the reforming reaction and water-gas shift reaction. This intermediary enables the system to achieve self-sustaining or exothermic operation, mediating between the fuel input and hydrogen output while managing the thermal balance
2Temperature
If external heat sources are used to drive the endothermic reforming reaction, then the reaction can proceed at required temperatures, but fossil fuel combustion must be used which increases costs and environmental impact
Solution Approach 1:
The patent converts the typically harmful waste heat from the exothermic water-gas shift reaction into a beneficial resource that sustains the reforming process temperature. The heat that would otherwise be waste now provides the necessary thermal energy, eliminating the need for separate fossil fuel combustion while maintaining required reaction temperatures
3Use of energy by stationary object
If higher steam and carbon monoxide amounts are introduced to alter the endothermic nature of the process, then the need for high-temperature furnaces is reduced, but the process complexity increases
Solution Approach 1:
The reformer feed system is designed to handle multiple components (methane, steam, carbon monoxide) that serve multiple functions: methane provides carbon and hydrogen, steam provides the reforming agent and heat transfer medium, and carbon monoxide adjusts the thermal balance. This multi-functional feed approach enables flexible operation without requiring separate dedicated systems for each function
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 the energetic and economic costs associated with hydrogen production, allowing for increased hydrogen yield and the potential elimination of fossil fuel combustion, while also enabling the use of renewable energy sources to meet system heat demands.
Implementation Method 1
reforming the feed gases (CH4, H2O, CO) to a stream of H2, CO2 and residual H2O, CO and CH4 feed gases
Implementation Method 2
converting CO to CO2 from the output stream of the reformer
Implementation Method 3
The output stream of the reformer is fed to a flash distillation water separator subsystem that separates and removes water from the stream
Implementation Method 4
The stream from the water separator is then fed to a hydrogen separator subsystem that purifies the hydrogen from the stream using pressure swing absorption
Data Source
AI summary
Methods and systems for producing hydrogen from methane or other fuels that has lower input heat requirements than conventional steam reformation schemes are provided. The system has a reactor with a controlled feed of fuel, water/steam, CO and recycle gases. The methods generally use significantly high amounts of steam (water) and carbon monoxide (CO) in the feed that substantially enhances the reaction rate of the water-gas shift reaction, which transforms CO and H2O to CO2 and H2. Since this reaction is exothermic, its enhancement alters the endothermic nature of the overall reforming process to the point where the overall reforming process is no longer endothermic. The CO requirements may be met in part with the reverse water-gas shift reaction from CO2 produced by the reactor. The lower heat requirements may be satisfied with renewable sources such as solar or from hydrogen produced by the system.