LOHC Hydrogen Power Cycle Without High-Pressure Storage
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Solution Overview
Problem
Current systems for generating carbon-neutral electricity using hydrogen face challenges such as low energy conversion efficiency, high-pressure hydrogen storage requirements, and net greenhouse gas emissions due to reliance on fossil fuels and inefficient energy management.
Innovation Solution
A scalable system utilizing a recyclable Liquid Organic Hydrogen Carrier (LOHC) that integrates hydrogen storage and generation, allowing for the use of renewable energy sources to produce and regenerate hydrogen, with a cyclic process that maintains carbon neutrality by recycling labile hydrogen and using carbon-neutral thermal energy sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-pressure hydrogen storage is used to increase operating flexibility and energy density, then hydrogen availability for electrochemical conversion is improved, but storage safety risks and infrastructure costs increase
Solution Approach 1:
The patent introduces liquid organic hydrogen carriers (LOHC) as intermediary substances that chemically bind hydrogen in a stable, liquid form. The LOHC acts as a mediator between hydrogen production and electrochemical conversion, allowing hydrogen to be stored and transported without high-pressure containment while maintaining availability for fuel cell conversion.
Solution Approach 2:
The patent changes the physical state parameter of hydrogen storage from gaseous high-pressure storage to liquid-phase chemical bonding in LOHC. This parameter change transforms hydrogen from a high-risk compressed gas into a stable liquid carrier that can be stored at ambient conditions, eliminating safety risks associated with high-pressure storage.
2Use of energy by stationary object
If hydrogen is combusted to generate thermal energy for dehydrogenation, then heat requirements are met, but greenhouse gas emissions increase and hydrogen availability for electricity generation decreases
Solution Approach 1:
The patent converts the previously harmful combustion process into a beneficial carbon-neutral thermal energy source by using biomass-derived liquid organic hydrogen carriers. The biomass combustion releases CO2 that was recently absorbed from the atmosphere, creating a carbon-neutral cycle that provides necessary thermal energy without net greenhouse gas emissions.
Solution Approach 2:
The patent makes the LOHC system multi-functional by designing it to simultaneously provide: (1) hydrogen storage and transport, (2) thermal energy generation through controlled dehydrogenation, and (3) carbon-neutral operation when paired with biomass-derived carriers. This eliminates the need for separate hydrogen and thermal energy systems.
3Use of energy by moving object
If battery storage systems are used to supply electricity, then electrical energy storage is achieved, but operating time is limited by recharging time and weight constraints
Solution Approach 1:
The patent implements preliminary action by pre-producing hydrogen through water electrolysis using renewable energy and storing it in LOHC form before it is needed. This allows the system to have hydrogen readily available for immediate electrochemical conversion, eliminating the recharging wait time inherent in battery systems while maintaining electrical energy storage 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
The system enables efficient, carbon-neutral electricity generation with reduced greenhouse gas emissions, flexible energy storage, and compatibility with existing infrastructure, addressing limitations in energy density and infrastructure costs associated with high-pressure hydrogen storage.
Implementation Method 1
catalytically dehydrogenating the recyclable liquid organic hydrogen carrier in a dehydrogenation reaction zone
Implementation Method 2
The release of hydrogen by dehydrogenation is an endothermic process, i.e., one which requires an input of heat
Implementation Method 3
combusting a portion of the unloaded aromatic substrate to provide thermal energy for maintaining the dehydrogenation reaction zone at carbon neutral operating conditions
Implementation Method 4
converting the hydrogen gas generated by dehydrogenation in an electrochemical conversion device to generate the carbon-neutral electricity
Implementation Method 5
the carbon-neutral component...combustion of which balances carbon emissions with carbon removal and is therefore carbon-neutral with respect to the hydrocarbon component
Data Source
AI summary
A method is described for generating carbon-neutral electricity using purified hydrogen as an energy source. A recyclable LOHC is provided to the process for reversible dehydrogenation. Hydrogen generated by dehydrogenation is purified and electrochemically converted to electricity. Heat for maintaining the dehydrogenation reaction temperature is derived from combustion of a portion of the liquid products from dehydrogenation, the portion combusted being less than or equal to the portion of carbon-neutral component included in the recyclable LOHC.