External Heat Transfer in Hydrogen Dehydrogenation Reactors
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Solution Overview
Problem
Existing hydrogen storage methods face challenges due to low density, flammability, and handling difficulties, particularly in chemical storage mediums, which require complex reactors for dehydrogenation and hydrogenation reactions.
Innovation Solution
A system and method for discharging and charging hydrogen using a reactor with a catalyst and a heat transfer element outside the reactor to temper the storage medium, reducing reactor complexity and costs by managing temperature externally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex reactor system with internal heat transfer is used for dehydrogenation, then the dehydrogenation reaction can be performed, but the device complexity and costs increase
Solution Approach 1:
The heat transfer function is extracted from the reactor system and placed in a separate external heat transfer unit. This allows the reactor to be simpler in design while the temperature control function is performed by the external unit, resolving the contradiction between reaction performance and device complexity.
Solution Approach 2:
The system is segmented into distinct functional units: the reactor for dehydrogenation reaction and a separate heat transfer unit for temperature control. This segmentation allows each component to be optimized independently, reducing overall system complexity while maintaining reaction effectiveness.
2Productivity
If the storage medium is overheated during dehydrogenation, then the reaction rate increases, but thermal decomposition and contamination occur
Solution Approach 1:
The external heat transfer unit provides controlled temperature management for the storage medium, preventing overheating and thermal decomposition while maintaining optimal reaction conditions. This feedback control resolves the contradiction between reaction rate and thermal decomposition.
3Ease of operation
If hydrogen is stored in gaseous form, then it is easy to handle, but the density is low and huge volumes are required
Solution Approach 1:
The hydrogen is transformed from gaseous form to chemical binding form in a storage medium, fundamentally changing the physical state and density parameters. This allows high-density storage while maintaining the ability to release hydrogen on demand, resolving the contradiction between handling ease and density.
4Quantity of substance
If hydrogen is compressed to high pressure or liquefied for storage, then the density increases, but energy consumption and safety hazards increase
Solution Approach 1:
The invention changes the storage parameter from physical compression or liquefaction to chemical binding in a storage medium. This achieves high-density storage at ambient conditions, eliminating the high energy consumption and safety hazards associated with high-pressure or cryogenic storage.
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 efficiently discharges and charges hydrogen with reduced complexity and costs, allowing operation in remote regions and improving safety by avoiding thermal decomposition and contamination.
Implementation Method 1
a catalyst is provided in the through-flow section and is configured to perform a dehydrogenation reaction with the storage medium to discharge hydrogen from the storage medium
Implementation Method 2
a heat transfer element configured to temper the storage medium for the dehydrogenation reaction
Data Source
Figure 1
Figure 2
AI summary
A system for discharging hydrogen from a storage medium charged with hydrogen comprises a reactor configured to carry out a dehydrogenation reaction, the reactor comprising a storage medium supply port for supplying the storage medium, a storage medium discharge port for discharging the storage medium, a through-flow section through which the storage medium flows, and a hydrogen discharge port for discharging hydrogen discharged from the storage medium, wherein a catalyst is provided in the through-flow section and is configured to perform a dehydrogenation reaction with the storage medium to discharge hydrogen from the storage medium; and a heat transfer element configured to temper the storage medium for the dehydrogenation reaction, wherein the heat transfer element is arranged outside the reactor.