Hydrogen Buffer System for Fuel Cell Delivery
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Solution Overview
Problem
The low volumetric energy density of hydrogen gas poses challenges in designing practical hydrogen-powered devices, as existing systems require complex designs to manage hydrogen storage and delivery, and are limited by the need for high-pressure storage and rate-controlled hydrogen generation, restricting the range of feasible fuels and system flexibility.
Innovation Solution
A hydrogen buffer system that stores hydrogen in a form conducive to fuel cell requirements, allowing for simple delivery mechanisms and enabling the use of various high-density storage means, including compressed gas, chemical hydrides, and liquefied hydrogen, without the need for complex rate control or pressure regulation, facilitating 'hot refueling' and extended operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hydrogen is stored at high pressure to increase volumetric energy density, then the energy density improves, but the device complexity increases due to need for pressure regulation and safety mechanisms
Solution Approach 1:
The patent introduces a buffer as an intermediary component between the high-pressure hydrogen storage and the fuel cell. The buffer receives hydrogen at high pressure and delivers it at regulated pressure to the fuel cell, isolating the fuel cell from pressure fluctuations and simplifying the overall system design.
Solution Approach 2:
The fuel delivery system is segmented into distinct functional components: a high-pressure storage section, a buffer section for pressure equalization, and a delivery section to the fuel cell. This segmentation allows each component to be optimized independently for its specific function.
2Productivity
If a fuel delivery mechanism is designed to control hydrogen flow rate precisely, then the fuel cell performance improves, but the device complexity increases
Solution Approach 1:
The buffer acts as a mediator that decouples the flow rate control function from the high-pressure storage. By allowing pressure equalization in the buffer, the system achieves stable fuel cell operation without requiring complex active flow control mechanisms upstream.
Solution Approach 2:
The buffer performs preliminary pressure equalization and flow stabilization before hydrogen enters the fuel cell. This preliminary action ensures that the fuel cell receives consistently conditioned hydrogen, improving performance without requiring complex real-time control systems.
3Quantity of substance
If hydrogen storage uses high-density methods, then the volumetric energy density improves, but the adaptability to different fuel sources decreases
Solution Approach 1:
The buffer serves multiple functions: it acts as a pressure equalization chamber, a flow regulator, and a compatibility interface for different hydrogen storage types. This multi-functionality allows the same basic architecture to work with various hydrogen sources including compressed gas, liquid hydrogen, and chemical hydrides.
Solution Approach 2:
The buffer allows the system to handle different hydrogen storage parameters (pressure, temperature, phase) by providing a transition zone where these parameters can be equalized and standardized before delivery to the fuel cell, enabling compatibility with diverse fuel sources.
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 hydrogen buffer system enhances the volumetric energy density of hydrogen, simplifies the design and operation of hydrogen-powered devices, allows for interchangeable fuel sources, and supports continuous operation without interrupting device use, addressing the limitations of prior art systems.
Implementation Method 1
Compressing hydrogen to very high pressures increases the density of the stored gas
Implementation Method 2
when hydrogen is needed to operate the fuel cell, a conversion from liquid to gaseous hydrogen must be effected almost instantaneously
Data Source
AI summary
A method for providing hydrogen to a hydrogen-powered device comprises providing a buffer connected to supply hydrogen to the device. The buffer is filled with hydrogen by coupling the buffer to a cartridge containing a predetermined quantity of hydrogen. The hydrogen in the cartridge may be stored in a form having a higher energy density than the hydrogen in the buffer. Systems comprising hydrogen-powered devices that include such buffers are also described.