Fuel Cell Water Discharge Path with Narrowed Section
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Solution Overview
Problem
The accumulation of water in connection holes of fuel cell systems can lead to blockages, interfering with the flow of reaction gases and reducing power generation performance, as existing porous water suction pipes are insufficient for removing the large amounts of produced water.
Innovation Solution
A fuel cell system design that includes a gas exhaust flow path interconnected with a water discharge flow path, where the gas exhaust flow path has a narrowed section with a smaller sectional area, allowing water to be efficiently introduced into the narrowed path and discharged, thereby reducing blockages in the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If porous water suction pipes are used to remove water from connection holes, then water removal capability is improved, but the open area of connection holes decreases or blocks due to accumulated water
Solution Approach 1:
The system divides water removal into two separate pathways: (1) porous water suction pipes for continuous water absorption from connection holes, and (2) a dedicated water discharge flow path that collects and removes large amounts of water from lower positions. This segmentation prevents water accumulation that would block connection holes while maintaining gas flow paths open.
Solution Approach 2:
The water discharge flow path acts as an intermediary structure that collects water from multiple sources (connection holes and lower positions) and transports it to discharge points. This intermediary pathway prevents water from directly blocking the gas exhaust flow path by providing a separate collection and removal mechanism.
2Productivity
If water discharge flow path is positioned at lower position than gas exhaust flow path, then water discharge efficiency is improved, but gas exhaust flow path may be blocked by water
Solution Approach 1:
The water discharge flow path is extracted and positioned separately at a lower level than the gas exhaust flow path. This spatial separation allows water to be discharged efficiently using gravity while preventing water from entering or blocking the gas exhaust flow path, as water naturally flows to the lower discharge path.
Solution Approach 2:
The system transitions from a single-level flow path design to a multi-level three-dimensional arrangement. The water discharge flow path is positioned in the vertical dimension at a lower level than the gas exhaust flow path, enabling independent water removal without interfering with gas flow while maximizing discharge efficiency through gravitational potential energy.
3Productivity
If gas exhaust flow path has narrowed section, then water introduction into narrowed path becomes efficient, but pressure loss in gas exhaust flow path increases
Solution Approach 1:
The gas exhaust flow path features a localized narrowed section (throat) at a specific position where water introduction is needed, while the rest of the path maintains a larger cross-sectional area. This local quality change allows efficient water injection and mixing at the narrowed section without causing excessive pressure loss throughout the entire gas exhaust system.
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 design effectively reduces the decrease or blockage of the gas exhaust flow path by water, ensuring smooth operation and improved power generation performance by utilizing the pressure difference to efficiently move water out of the fuel cell stack.
Implementation Method 1
the pressure of the reaction gas passing through the narrowed flow path is lower than the pressure of the reaction gas flowing through the gas exhaust flow path other than the narrowed flow path
Implementation Method 2
a narrowed flow path having smaller sectional area than sectional area of an adjacent flow path in downstream of the connecting section, the narrowed flow path being formed in a downstream insulator
Implementation Method 3
locate porous water suction pipes for water discharge in connection holes (also called 'manifolds'), in order to remove reaction product water produced by electrode reactions of fuel cells
Data Source
AI summary
A fuel cell system includes: a gas exhaust flow path extended in a stacking direction of laminates and configured to have one end located inside a fuel cell stack and the other end located outside the fuel cell stack; and a water discharge flow path provided at a lower position than the gas exhaust flow path and formed to pass through at least part of the laminates. The gas exhaust flow path is interconnected with the water discharge flow path via at least one connecting section in the fuel cell stack. The gas exhaust flow path includes a narrowed flow path having the smaller sectional area than the sectional area of an adjacent flow path in downstream of the connecting section. The water discharge flow path has a downstream end connecting with the narrowed flow path.