Hydride-Hydrate Hydrogen Generator Thermal Management
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Solution Overview
Problem
Existing hydrogen generation systems from hydrides often produce runaway high temperatures and volatile chemical reactions due to inadequate heat management during hydrolysis, which is not effectively addressed by previous methods.
Innovation Solution
A hydrogen generator system comprising a hydride/hydrate combination where the temperature is maintained at or near a selected phase transition temperature, with the hydrate absorbing the heat released by the hydride, using specific calculations to determine the relative amounts of reactants to balance the heat of dehydration and hydrolysis reactions, thereby controlling the reaction temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrolysis of hydride is used to generate hydrogen gas, then hydrogen production efficiency is improved, but runaway high temperatures and volatile reactions occur
Solution Approach 1:
The patent utilizes the phase transition of a hydrate (from hydrated to anhydrous form) as a temperature control mechanism. During the exothermic hydrolysis of the hydride, the hydrate undergoes phase transition at a predetermined temperature, absorbing the heat of reaction and maintaining the system temperature at or near the phase transition temperature, thereby preventing runaway high temperatures while sustaining high hydrogen production efficiency
Solution Approach 2:
The hydrate acts as an intermediary substance between the hydride and the environment. It mediates the heat transfer from the exothermic hydrolysis reaction, absorbing excess heat during its phase transition and releasing it gradually, thus controlling the reaction temperature without interfering with the hydrogen generation process
2Reliability
If heat management is improved to control temperature, then reaction stability is improved, but system complexity increases
Solution Approach 1:
The system achieves self-regulating temperature control through the inherent phase transition properties of the hydrate. As the hydrolysis reaction releases heat and raises the temperature, the hydrate automatically undergoes phase transition at the predetermined temperature, absorbing heat and maintaining thermal stability without requiring external control systems, sensors, or active management mechanisms
Solution Approach 2:
The patent exploits the change in physical state (phase transition) of the hydrate at a specific temperature parameter. This phase change occurs at a predetermined temperature that matches the desired operating temperature for hydrogen generation, allowing the system to self-adjust and maintain optimal temperature conditions through the natural thermodynamic properties of the hydrate
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 allows for the generation of hydrogen gas at moderated temperatures, preventing runaway reactions and ensuring a stable temperature, as demonstrated by examples such as the NaBH4/Na2SO4.10H2O and NaBH4/FeSO4.7H2O systems, which maintain temperatures within a desired range.
Implementation Method 1
the temperature of the system is kept at or near a constant temperature at or near a selected phase transition temperature of the hydrate during the generation of hydrogen gas during the hydrolysis of the hydride
Implementation Method 2
the hydrate absorbing the heat released by the hydride
Implementation Method 3
during the generation of hydrogen gas during the hydrolysis of the hydride
Data Source
AI summary
The present subject matter provides heat management while generating hydrogen gas from a hydride achieved by coupling a hydride with a hydrate. The present subject matter unexpectedly provides improved methods so that the heat released by the hydride during hydrolysis is accurately balanced by the heat absorbed by the hydrate as the hydrate undergoes a phase transition to a less hydrated or to an anhydrous form. Examples of heat-moderated hydrogen generating systems are provided, and include, among others: NaBH4/Na2SO4.10H2O, NaBH4/CoSO4.7H2O, and NaBH4/FeSO4.7H2O. The subject matter provides a methodology for determining the correct proportions of hydride/hydrate to use in preparing a hydrogen generator capable of operating at a nearly constant temperature at or near a phase transition temperature of the hydrate or at a higher temperature that is still within a desired temperature range, such as, for example, 30-90° C.