Fluidized Ammonia Dissolving Media for Fuel Cell Decontamination
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Solution Overview
Problem
Existing fuel cell contaminant removal systems are inefficient and require frequent maintenance, as they often rely on complex and costly components for processing large volumes of fluids and frequent replacement of filters or ion beds, especially when dealing with ammonia contaminants in fuel reactant streams.
Innovation Solution
A fluidized bed contaminant separator and water-control loop system that dissolves ammonia and removes particulates from the fuel reactant stream using a fluidized bed with a light-weight, high-surface-area media, followed by an ion exchange bed for decontamination, allowing for controlled temperature management and reduced maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex ammonia removal systems (steam strippers, scrubbers) are used, then ammonia removal effectiveness is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent employs a porous adsorbent material in a simple filter cartridge that physically adsorbs ammonia from the fuel reactant stream. This porous material provides high surface area for ammonia capture without requiring complex mechanical systems, thereby achieving reliable ammonia removal while maintaining system simplicity.
Solution Approach 2:
The patent uses a disposable or easily replaceable filter cartridge containing adsorbent material. Instead of maintaining complex reusable systems like steam strippers, the solution is to periodically replace simple, low-cost filter cartridges that have captured ammonia, significantly reducing maintenance complexity while ensuring continuous ammonia removal effectiveness.
2Productivity
If large volume fluid processing systems are used, then contaminant removal capacity is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the approach from processing large volumes of fuel stream through complex mechanical systems to using a high-capacity adsorbent material that can remove contaminants directly from the fuel stream. By changing the removal mechanism parameter (from mechanical separation to adsorption), the system achieves high contaminant removal capacity with a simple device that does not require large volume processing capability.
3Reliability
If frequent filter and ion bed replacement is required, then contaminant removal effectiveness is maintained, but loss of time and maintenance frequency increase
Solution Approach 1:
The patent uses a high-capacity porous adsorbent material that can trap and retain ammonia and other contaminants over extended periods. This material provides sufficient capacity to maintain contaminant removal effectiveness throughout longer operational intervals between maintenance events, reducing the frequency of filter replacements compared to conventional 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 system achieves efficient contaminant removal with minimal maintenance and cost, isolating ammonia from other power plant water systems, enhancing absorption efficiency and extending maintenance intervals for ion exchange bed replacement.
Implementation Method 1
flowing the fuel reactant stream through a fluidized ammonia dissolving media within a fluidized bed that dissolves ammonia and removes particulates from the fuel reactant stream
Implementation Method 2
The separated contaminant and water stream from the fluidized bed is accumulated within an accumulator. The separated contaminant and water stream from the accumulator is circulated through a water-control loop. The separated contaminant and water stream is decontaminated by flowing the stream through an ion exchange bed
Implementation Method 3
flowing the fuel reactant stream through a fluidized ammonia dissolving media within a fluidized bed that dissolves ammonia and removes particulates from the fuel reactant stream within a separator scrubber
Data Source
AI summary
An example method of decontaminating a fuel reactant stream for a fuel cell flows the fuel reactant stream through a fluidized ammonia dissolving media, while simultaneously flowing water through the fluidized ammonia dissolving media to separate contaminants from the fuel reactant stream into a separated contaminant and water stream. The separated contaminant and water stream from the fluidized bed is accumulated within an accumulator, circulated through a water-control loop, and decontaminated by flowing the stream through an ion exchange bed secured in fluid communication with the water-control loop. A decontaminated water stream from the ion exchange bed is circulated back through the ammonia dissolving media. A temperature of the fuel reactant stream is controlled upstream of the fuel reactant stream entering the separator scrubber to produce a predetermined temperature of the fuel reactant stream passing through the separator scrubber.