Fuel Cell Stuck Valve Detection Using Raw Material Gas
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Solution Overview
Problem
Conventional fuel cell systems do not effectively check for stuck on-off valves due to high steam concentration, which can cause valves to become stuck closed, and they require additional test gas supply equipment for leak checks.
Innovation Solution
A fuel cell system configuration that includes a deodorizing device, a reformer, a fuel cell, and a stuck-state checker, which uses the raw material gas to check if on-off valves downstream from the deodorizing device and extending through the reformer are stuck closed, without the need for additional test gas supply equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional leak check methods are used, then gas leakage can be detected, but stuck on-off valves cannot be detected and additional test gas supply equipment is required
Solution Approach 1:
The raw material gas supply system is designed to serve dual purposes: normal fuel cell operation and stuck valve detection. The stuck-state checker utilizes the existing raw material gas supply infrastructure to perform detection functions without requiring separate test gas supply equipment, thereby achieving multi-functionality with existing components
Solution Approach 2:
The system uses its own raw material gas supply capability to perform self-diagnosis for stuck valve detection. Instead of requiring external test equipment, the fuel cell system leverages its inherent gas supply function to detect valve abnormalities, enabling the system to service itself
2Productivity
If steam concentration is high in combustible gas, then reforming reaction efficiency is improved, but on-off valves become stuck closed due to condensation water
Solution Approach 1:
The system performs a stuck-state check before initiating pressure compensation operations or normal operation. By detecting potential valve sticking conditions in advance through pressure differential measurement during raw material gas supply, the system prevents operational failures before they occur
Solution Approach 2:
The stuck-state checker provides continuous feedback on valve operational status by monitoring pressure differentials across valves during raw material gas supply. This feedback mechanism enables real-time detection of valve sticking conditions, allowing the control unit to respond appropriately by preventing pressure compensation operations when abnormalities are detected
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
Enables effective checking of stuck on-off valves without additional equipment, ensuring safe and reliable operation by preventing pressure compensation operations when abnormalities are detected and reducing the risk of gas leakage.
Implementation Method 1
a deodorizing device configured to remove an odor component contained in a raw material gas
Implementation Method 2
a reformer configured to generate a hydrogen-containing gas through a reforming reaction using the raw material gas
Implementation Method 3
a fuel cell configured to generate power by using the hydrogen-containing gas that is discharged from the reformer
Data Source
AI summary
A fuel cell system according to the present invention includes: a deodorizing device (20) configured to remove an odor component contained in a raw material gas; a reformer (32) configured to generate a hydrogen-containing gas through reforming reaction using the raw material gas that is discharged from the deodorizing device; a fuel cell (1) configured to generate power by using the hydrogen-containing gas that is discharged from the reformer; at least one on-off valve (21a, 21b, 3a, 3b, 28, 29) provided on the combustible gas passage which is downstream from the deodorizing device and which extends through the reformer; and a stuck-state checker (13, 18, 7) configured to perform a stuck-state check on the on-off valve by supplying the raw material gas to the combustible gas passage.