Fuel Cell System With Electrodeionization Water Purification
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Solution Overview
Problem
Fuel cell systems face performance deterioration and reduced cycle-life due to impurities in water supplied to the reformer, as conventional water treatment methods are ineffective in maintaining consistent water quality across different regions, leading to scale formation and efficiency issues.
Innovation Solution
A fuel cell system incorporating an electrodeionization device that removes impurity ions from water, coupled with a sensing unit to monitor electrical conductivity and a control unit to automatically shut down operations when impurity levels exceed safe limits, ensuring the water quality is maintained within 5-10 µS/cm, preventing scale formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter-type water treatment method using an ion exchange resin material is used, then water purification is achieved, but water quality consistency varies across regions due to different impurity compositions
Solution Approach 1:
The patent transitions from chemical filtration (ion exchange resin) to physical-electrical purification (electrodeionization), fundamentally changing the water treatment mechanism. This allows consistent purification performance across different regional water compositions by applying electrical fields rather than relying on region-specific chemical filter properties
Solution Approach 2:
The patent replaces the mechanical/chemical filtration system with an electrodeionization system that uses electrical fields and ion-exchange membranes to remove impurities. This substitution enables more consistent and controllable water purification across different regions with varying impurity compositions
2Reliability
If conventional filter-type water treatment is used, then initial water purification is achieved, but scale formation occurs inside the reformer leading to performance deterioration
Solution Approach 1:
The patent replaces conventional chemical filtration with electrodeionization technology that uses electrical fields to actively remove ionized impurities. This more effective purification method prevents scale formation in the reformer by completely removing dissolved ions that would otherwise precipitate and form deposits
Solution Approach 2:
The patent applies electrodeionization to convert the harmful effect of dissolved ions (which cause scale) into a benefit by using electrical fields to actively attract and remove these ions through ion-exchange membranes, transforming the purification process from passive filtration to active ion removal
3Reliability
If real-time water quality monitoring is implemented, then performance deterioration is prevented, but system complexity increases
Solution Approach 1:
The patent implements a feedback control system where an electrical conductivity sensor continuously monitors water quality and provides real-time data to a controller. The controller automatically adjusts the electrodeionization process or triggers alerts, creating a closed-loop system that maintains water quality without requiring complex manual monitoring procedures
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 system effectively monitors and maintains pure water quality in real-time, preventing performance deterioration and cycle-life reduction by automatically shutting down operations when impurity levels become hazardous, thus ensuring the fuel cell system's efficiency and longevity.
Implementation Method 1
an electrodeionization device for purifying water supplied to a reformer and a fuel cell stack
Implementation Method 2
a cell in which an ion exchange resin is filled between a positive ion exchange membrane and a negative ion exchange membrane
Implementation Method 3
a sensing unit for measuring electrical conductivity of the pure water
Data Source
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AI summary
A fuel cell system includes: a reformer converting a fuel gas into a reformed gas rich in hydrogen; a fuel cell stack generating electricity by using the reformed gas; an electrodeionization device discharging pure water in which an impurity ion is removed from supplied water; a sensing unit measuring electrical conductivity of the pure water; a water supply unit supplying the pure water to the reformer and the fuel cell stack; and a control unit controlling an operation of the fuel cell stack depending on a measuring signal of the sensing unit.