PSA Startup Time Reduction via Hydrogen Purge
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Solution Overview
Problem
Conventional pressure swing adsorption (PSA) systems face challenges in reducing startup time, which is critical for hydrogen-generation and fuel cell systems, especially in applications requiring rapid energy production, such as backup power systems.
Innovation Solution
The implementation of defined shutdown and startup procedures for PSA assemblies, allowing them to enter a controlled dormant state and quickly resume operation, with the use of stored hydrogen or reformate gas to initiate startup concurrently with other system components, thereby reducing overall startup time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional PSA systems are used without optimized startup procedures, then the system can operate reliably, but the startup time is excessively long
Solution Approach 1:
The patent applies preliminary action by pre-conditioning the PSA system during a controlled dormant state before full operation is required. The system performs preliminary adsorption and desorption cycles to prepare the adsorbent beds, and pre-positioning hydrogen or reformate gas in the system allows the PSA unit to skip lengthy initialization phases and transition rapidly to productive operation when energy production is needed.
2Loss of time
If the PSA assembly is placed in a controlled dormant state, then startup time is reduced, but additional control mechanisms and procedures are required
Solution Approach 1:
The patent applies dynamics by creating a dormant state that is neither fully active nor completely shutdown, but a dynamic intermediate condition where the PSA system maintains partial operational readiness. The system can dynamically transition between dormant and active states based on control signals, with the dormant state preserving sufficient system conditions (pressure, temperature, adsorbent configuration) to enable rapid startup without requiring complete system reinitialization.
3Loss of time
If hydrogen or reformate gas is used to initiate startup, then startup time decreases, but the system requires additional gas storage and distribution infrastructure
Solution Approach 1:
The patent applies universality by designing the hydrogen storage and distribution infrastructure to serve multiple functions: it provides hydrogen for fuel cell operation during normal conditions, supplies reformate or hydrogen gas for PSA startup initiation, and maintains system pressure and temperature conditions during dormant states. This multi-functional infrastructure reduces the need for separate dedicated startup 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 approach significantly decreases the startup time of PSA assemblies and hydrogen-generation systems, ensuring quicker production of high-purity hydrogen gas, which is essential for efficient energy production in emergency power situations.
Implementation Method 1
a plurality of adsorbent beds that include an adsorbent region including adsorbent adapted to remove impurities from a mixed gas stream containing hydrogen gas as a majority component
Implementation Method 2
PSA is a pressure-driven separation process that utilizes a plurality of adsorbent beds. The beds are cycled through a series of steps, such as one or more pressurization, separation (adsorption), equalization, depressurization (desorption), and/or purge steps
Data Source
AI summary
Pressure swing adsorption (PSA) assemblies with optimized startup times, as well as to hydrogen-generation assemblies and/or fuel cell systems containing the same, and methods of operating the same. Startup and shutdown methods for a PSA assembly, and optionally an associated fuel processing system, are disclosed to provide for shortened startup times. The PSA assemblies may be in fluid communication with a hydrogen source that may be used or otherwise configured or controlled to purge the PSA adsorbent columns of adsorbents during startup and/or shutdown procedures, the hydrogen source additionally or alternatively may be used or otherwise configured or controlled to charge the columns with hydrogen for idling in a pressurized state. The use of this hydrogen source, together with specific startup and shutdown methodologies, provides for reducing the startup time of the PSA assembly.