On-Demand Hydrogen Generation Using Recyclable Liquid Metal Reagents
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hydrogen generating systems face challenges in efficiently producing hydrogen on demand, particularly in vehicles and turbines, due to low energy density, high storage efficiency issues, and the use of expensive catalysts or toxic substances, along with complex and environmentally unfriendly processes.
Innovation Solution
A novel hydrogen generation system using an aluminum-free metal reagent, such as alkali metals or alkaline earth metals, reacts with water in a controlled, oxygen-free environment to produce hydrogen, with a recyclable liquid metal reagent and a recovery process for the metal hydroxide residue, allowing for controlled on-demand hydrogen production and efficient recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hydrogen is stored as gas or liquid in tanks, then hydrogen can be conveyed to power generating systems, but storage efficiency is poor and energy density is low
Solution Approach 1:
The invention changes the physical state of the metal reagent from solid to liquid by heating above its melting point, enabling controlled flow and reaction rate adjustment. This parameter change allows the system to produce hydrogen on-demand with much higher effective energy density compared to conventional storage tanks
Solution Approach 2:
The system utilizes phase transition of the metal reagent (solid to liquid) to control the hydrogen generation process. The liquid metal reagent can be precisely metered and controlled during reaction, providing superior control over hydrogen production rate and efficiency compared to gas or liquid hydrogen storage
2Productivity
If conventional metal reagents are used, then hydrogen can be generated, but the processes are violent, occur at very high temperatures and pressures, and are difficult to control
Solution Approach 1:
The invention uses alkali metals and alkaline earth metals with much lower melting points than conventional aluminum-based reagents. By controlling the temperature just above the melting point (not thousands of degrees), the system achieves gentle, controllable reactions that are easy to operate while maintaining high hydrogen generation rates
Solution Approach 2:
The invention replaces violent mechanical/thermal processes with controlled chemical reactions of liquid metal reagents. The gentle exothermic reactions of liquid alkali metals with water provide controlled hydrogen generation without the extreme temperatures and pressures required by conventional methods
3Stress or pressure
If aluminum-based metal reagents are used, then hydrogen can be generated at high pressure, but the reactions are violent and difficult to control
Solution Approach 1:
The invention changes from aluminum-based reagents (melting point 660°C, violent reactions) to alkali metal reagents (melting points -120°C to 98°C, gentle reactions). This parameter change enables the system to produce high-pressure hydrogen safely through controlled, gentle exothermic reactions that are inherently more reliable
4Productivity
If expensive catalysts or toxic substances are used in hydrogen generation, then hydrogen can be produced, but operational costs increase and environmental impact worsens
Solution Approach 1:
The system uses readily available water as the reactant and produces only hydrogen and metal hydroxide as products. The metal hydroxide can be easily regenerated back to metal reagent through simple heating, creating a self-sustaining cycle that eliminates expensive catalysts and toxic substances while minimizing environmental impact
Solution Approach 2:
The invention recycles the metal reagent through a simple regeneration process where metal hydroxide is heated to release water vapor and reform the metal. This recovery process eliminates waste and avoids the need for expensive catalysts or toxic chemicals, reducing both operational costs and environmental harm
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 controlled, efficient hydrogen generation and recycling, reducing environmental impact and operational costs, with the ability to adapt to varying energy demands and operate at lower pressures and temperatures, avoiding deflagrations and greenhouse gas emissions.
Implementation Method 1
reacts with water in a controlled, oxygen-free environment to produce hydrogen
Implementation Method 2
a flow of liquid metal reagent heated above its melting point
Implementation Method 3
in a controlled, oxygen-free environment
Data Source
AI summary
A hydrogen generating system and a method of in situ hydrogen generation controlled on demand capable of reacting an aluminum-free metal reagent composed of at least one of alkali metals, alkaline earth metals, alkali metal alloys and blends including alkali metals, alkaline earth metal alloys and blends including alkaline earth metals and metal alloys including at least one alkali metal and at least one alkaline earth metal, with water to obtain hydrogen and a residual reaction product including metal hydroxide composed of at least one of alkali hydroxides and alkaline earth hydroxide; and separating hydrogen from the residual reaction product; liquefying the metal reagent by heating to obtain liquid metal reagent under vacuum conditions; injecting the liquid metal reagent into a reactor by metal reagent injecting means and simultaneously injecting, by water injection system, a stoichiometric amount of water with respect to the amount of the liquid metal reagent being injected into the reactor such that a controlled metal reagent/water ratio is maintained in the reactor; transferring hydrogen and the residual reaction product from the reactor to separation means; separating hydrogen from the residual reaction product; transferring separated hydrogen to hydrogen receiving means and transferring the residual reaction product to metal hydroxide receiving means, keeping the metal reagent injecting means water injection system, the reactor, the separating means and the hydrogen receiving means free of oxygen by selectively providing a vacuum in the system.