Sodium-Water Hydrogen Generator for Safe On-Demand Fuel Cell Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for hydrogen storage and generation in commercial and private motor vehicles are unsafe and costly due to the flammability and leakage risks of compressed hydrogen gas, and the high costs associated with metal hydride storage systems.
Innovation Solution
A compact chemical-mechanical apparatus generates hydrogen on-demand using the reaction between sodium metal and water, producing hydrogen gas and sodium hydroxide as a byproduct, which can be recycled through electrolysis, eliminating the need for electrical components and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If compressed hydrogen gas is stored in high pressure cylinders, then hydrogen can be transported and distributed, but the system becomes dangerous and prone to leaks due to hydrogen's flammability and small molecule size
Solution Approach 1:
The patent extracts the hydrogen storage function from gaseous form and incorporates it into a solid metal hydride material. The metal hydride solid contains hydrogen in a stable, non-flammable state, eliminating the need for high-pressure cylinders and their associated leakage and fire hazards while maintaining hydrogen storage capacity.
Solution Approach 2:
The patent changes the physical state of hydrogen from gas to solid (metal hydride form) and adjusts the storage conditions from high pressure to ambient pressure. This parameter change transforms hydrogen from a hazardous compressed gas into a safe solid material that can be stored without special containment requirements.
2Reliability
If metal hydride compounds are used for hydrogen storage, then hydrogen can be stored safely, but the system becomes too costly due to expensive transition metals
Solution Approach 1:
The patent employs iron powder, which is abundant and inexpensive, as the metal hydride material. Instead of using expensive transition metals like titanium or nickel, the system uses cheap iron that can be easily replaced if needed, dramatically reducing the cost of hydrogen storage while maintaining safety through the stable iron hydride compound.
Solution Approach 2:
The patent changes the metal material from expensive transition metals to cheap iron. This material substitution maintains the safety benefits of metal hydride storage while eliminating the high cost associated with rare and expensive metals, making the system economically viable.
3Productivity
If heating is applied to metal hydride to release hydrogen, then hydrogen can be generated on-demand, but electrical heaters increase the probability of malfunctions and sparking
Solution Approach 1:
The patent replaces electrical heating systems with a purely mechanical pressure-driven system. A pressure regulator and water injection mechanism mechanically control the hydrolysis reaction rate, eliminating electrical components and their associated malfunction and sparking risks while maintaining reliable hydrogen generation on-demand.
Solution Approach 2:
The patent introduces water as an intermediary reactant that controls hydrogen generation. Instead of using electrical heat to drive the reaction, water is introduced as a controlled intermediary that facilitates the hydrolysis of iron hydride, providing a safe and reliable way to generate hydrogen without electrical heating.
4Ease of manufacture
If sodium metal reacts with water to generate hydrogen, then hydrogen can be produced safely and cost-effectively, but the reaction requires controlled addition of water to prevent runaway reactions
Solution Approach 1:
The patent implements a feedback control system where a pressure regulator monitors the reaction chamber pressure and automatically adjusts water addition rate. When pressure increases, the regulator reduces water flow; when pressure drops, it increases water flow. This feedback mechanism safely controls the exothermic reaction without requiring manual intervention or complex safety systems.
Solution Approach 2:
The patent designs a self-regulating system where the reaction itself provides the cooling needed to control the rate. The exothermic reaction generates heat that naturally moderates the reaction speed, and the pressure-regulated water addition system automatically adjusts reactant supply based on real-time conditions, eliminating the need for external control systems.
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 method safely and cost-effectively generates hydrogen for fuel cells, minimizing storage risks and costs, making it suitable for widespread use in commercial and private electric motor vehicles.
Implementation Method 1
The reaction between sodium metal and water produces hydrogen gas and sodium hydroxide according to the chemical equation: 2Na+2H2O→2NaOH+H2
Implementation Method 2
The electrical energy for large scale reprocessing of NaOH via the electrolytic process, can be obtained from large hydroelectric or nuclear power plants
Data Source
AI summary
A compact, chemical-mechanical apparatus, having no electrical components, for storing and generating hydrogen safely, on-demand, at the time and point of use in small or large quantities using the environmentally clean chemical reaction between sodium metal and water to generate hydrogen (H2) gas and sodium hydroxide (NaOH) byproduct is presented, for powering electricity generating fuel cells for large scale commercial and private electric motor vehicle transport. The apparatus of the present invention supports hydrogen gas generation by the controlled addition of liquid water to solid sodium metal to produce hydrogen gas and sodium hydroxide using only mechanical components without electrical components that require external power and can generate sparks or short circuits, producing catastrophic failure in hydrogen systems. The sodium hydroxide can be reclaimed and recycled by electrolysis using hydroelectric power to recover the sodium metal for reuse in generating hydrogen, thereby forming a complete clean energy hydrogen power cycle.