Dehydrogenation Reactor Volume Reduction via Partial Reaction
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Solution Overview
Problem
Existing methods for providing hydrogen gas in mobile applications, such as hydrogen-powered vehicles, require large installation spaces due to the need for extensive dehydrogenation reactors and storage containers, leading to inefficiencies and increased space requirements.
Innovation Solution
The method involves optimizing the dehydrogenation reaction by focusing on zones with high reaction rates within the dehydrogenation reactor, reducing the overall installation space by minimizing the length of the flow tube and using multiple reactors in parallel or series configurations to maintain efficient hydrogen release, while adjusting the dehydrogenation stroke for optimal space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If complete dehydrogenation reaction is used to release hydrogen gas from hydrogen carrier medium, then hydrogen release efficiency is improved, but overall installation space increases significantly
Solution Approach 1:
The patent applies partial action by deliberately stopping the dehydrogenation reaction before complete hydrogen release (at 5-15% residual hydrogen instead of 0%). This partial dehydrogenation approach reduces the required reactor volume and flow tube length while still providing sufficient hydrogen for mobile applications, thereby resolving the contradiction between hydrogen release efficiency and installation space requirements
Solution Approach 2:
The patent changes the dehydrogenation stroke parameter from the conventional near-complete conversion to a controlled partial conversion (stopping at 5-15% residual hydrogen). This parameter change optimizes the balance between hydrogen release productivity and reactor volume, reducing installation space while maintaining adequate hydrogen supply for mobile applications
2Volume of stationary object
If dehydrogenation reactor volume is reduced to minimize installation space, then overall device compactness is improved, but hydrogen release rate decreases
Solution Approach 1:
By implementing partial dehydrogenation (stopping at 5-15% residual hydrogen), the patent reduces the effective dehydrogenation stroke required in the reactor. This allows for a smaller reactor volume while maintaining adequate hydrogen release rates for mobile applications, as the reaction is stopped in the high-rate zone before catalyst deactivation and side reactions occur
Solution Approach 2:
The patent skips the low-productivity zone of the dehydrogenation reaction by deliberately stopping the process at 5-15% residual hydrogen. This avoids the extended residence time and larger reactor volume that would be required to achieve complete dehydrogenation, thereby reducing installation space while maintaining sufficient hydrogen release rates
3Volume of stationary object
If flow tube length is minimized to reduce installation space, then device compactness is improved, but reaction completeness deteriorates
Solution Approach 1:
The patent applies partial action by intentionally limiting the flow tube length to achieve only partial dehydrogenation (5-15% residual hydrogen). This shorter flow tube length reduces installation space while the controlled partial reaction completeness is sufficient for mobile hydrogen applications, avoiding the need for excessively long flow tubes that would increase device size
4Reliability
If multiple reactors are used in parallel or series to maintain hydrogen release efficiency, then hydrogen release stability is improved, but device complexity increases
Solution Approach 1:
By implementing partial dehydrogenation in a single reactor, the patent simplifies the overall device configuration compared to multiple-reactor systems. The partial reaction approach maintains adequate hydrogen release stability for mobile applications without requiring complex parallel or series reactor arrangements, thereby reducing device complexity while preserving sufficient reliability
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 significantly reduces the overall installation space required for hydrogen gas provision, improves the efficiency of hydrogen storage and release, and enhances the purity of the hydrogen stream by minimizing catalyst material and residence time, thus optimizing the hydrogen storage process for mobile applications.
Implementation Method 1
The hydrogen is released by a material conversion of the loaded hydrogen carrier medium (LOHC-H) by discharging in the at least one dehydrogenation reactor of the discharging unit by means of a catalytic dehydrogenation reaction
Implementation Method 2
A heating circuit with at least one hydrogen burner serves to provide heat for the dehydrogenation reactor
Implementation Method 3
A heating circuit with at least one hydrogen burner serves to provide heat for the dehydrogenation reactor
Data Source
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AI summary
The invention relates to a process for providing hydrogen gas, comprising the steps of supplying a hydrogen carrier medium of a first hydrogenation degree from a storage reservoir (15, 35) to a dehydrogenation reactor (17) and of dehydrogenating the hydrogen carrier medium to a second hydrogenation degree which is lower than the first hydrogenation degree, thereby releasing hydrogen gas, the difference between the first hydrogenation degree and the second hydrogenation degree being in the range of an optimum dehydrogenation capacity.