Integrated Fuel Cell Dehydrogenation System
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hydrogen storage and fuel cell technologies, such as those using liquid organic hydrocarbon compounds (LOHC) and 2-propanol, face inefficiencies in power generation due to the need for additional heating and lower hydrogen storage density, leading to reduced vehicle range and increased equipment costs.
Innovation Solution
A system that directly transfers hydrogen from a high-density hydrogen storage medium to a hydrogen transfer medium within a fuel cell, eliminating intermediate steps and utilizing a heat transfer unit to maintain thermo-neutrality, allowing for efficient electricity generation without the need for external heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrogen is stored in LOHC and released via dehydrogenation reactor, then hydrogen can be supplied to fuel cell, but additional heat supply equipment is required and efficiency is reduced
Solution Approach 1:
The patent combines the dehydrogenation reactor and fuel cell into a single integrated device. The catalyst bed serves dual functions: as a reaction medium for dehydrogenation and as the fuel cell electrode. This eliminates the need for separate heat supply equipment and simplifies the overall system structure while maintaining reliable hydrogen supply to the fuel cell.
Solution Approach 2:
The catalyst bed is designed to perform multiple functions simultaneously: it acts as the reaction medium for LOHC dehydrogenation, provides catalytic sites for hydrogen release, and serves as the fuel cell electrode for electricity generation. This multi-functionality eliminates the need for separate components and reduces equipment complexity.
2Productivity
If dehydrogenation reactor is used to release hydrogen from LOHC, then hydrogen gas is obtained for fuel cell, but waste heat from fuel cell is insufficient for preheating
Solution Approach 1:
The patent converts the waste heat problem into a benefit by designing the system so that the exothermic fuel cell reaction provides the necessary heat for the endothermic dehydrogenation reaction. The heat generated at the fuel cell side is transferred to the reactant side, creating a self-sustaining thermal cycle that eliminates the need for external heat supply and improves overall energy efficiency.
Solution Approach 2:
The system utilizes the thermal energy from the phase change and chemical reaction processes. The exothermic oxidation reaction in the fuel cell generates heat that drives the endothermic dehydrogenation reaction, creating a thermal coupling that efficiently manages energy transfer without external heating requirements.
3Ease of manufacture
If 2-propanol is used in direct fuel cell, then hydrogen can be converted to acetone, but hydrogen storage density is lower compared to LOHC
Solution Approach 1:
The patent introduces LOHC as an intermediary hydrogen storage medium. Instead of directly using 2-propanol with low storage density, the system uses LOHC with high storage density to store hydrogen, then releases it in situ within the fuel cell device. This intermediary approach allows the system to benefit from both high storage density and direct conversion capability.
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 enhances power generation efficiency, increases vehicle range, reduces equipment costs, and minimizes carbon dioxide emissions by avoiding total oxidation and using existing fuel infrastructure, while maintaining safety and operational efficiency.
Implementation Method 1
hydrogen stored in a hydrogen storage medium, especially LOHC, can be transferred in a hydrogen transfer unit to a hydrogen transfer medium
Implementation Method 2
The release of hydrogen from LOHC is endothermic. The dehydrogenation reaction takes place in a temperature range of approximately 280 °C to 320 °C
Implementation Method 3
supply it to a fuel cell for electricity generation
Implementation Method 4
utilizing a heat transfer unit to maintain thermo-neutrality
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A device for producing electricity comprises a hydrogen transfer unit (6) for transferring hydrogen from a hydrogen storage medium to a hydrogen transfer medium as well as an electricity generation unit (3) for producing electricity from the hydrogen transfer medium.