Assembly Manifold for Juxtaposed Fuel Cell Stacks
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Solution Overview
Problem
Conventional fuel cell systems have a complex and large piping structure, making them unsuitable for small spaces and laborious to assemble, with uneven gas distribution across stacked fuel cells, which affects power generation performance.
Innovation Solution
A fuel cell system with two juxtaposed fuel cell stacks of the same structure, each with six fluid passages at opposite ends, connected by a central assembly manifold that simplifies the piping structure and ensures equal gas distribution across both stacks, reducing the overall size and component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If external manifold assemblies are provided on opposite ends of the fuel cell stack array, then the fuel gas can be supplied to multiple stacks, but the overall size of the system becomes considerably large and the piping structure becomes complicated
Solution Approach 1:
The patent combines multiple manifold functions into a single integrated assembly manifold that serves multiple fuel cell stacks simultaneously. Instead of having separate external manifold assemblies at opposite ends, the invention uses one centralized manifold structure with multiple connection ports that can supply fuel gas to stacks arranged in a compact configuration, thereby reducing overall system size while maintaining multi-stack supply capability.
Solution Approach 2:
The assembly manifold is designed as a universal component that performs multiple functions: it serves as both a fuel gas distribution system and a structural support element for connecting multiple stacks. The manifold incorporates various connection ports and internal passages that enable it to handle different fluid flows (fuel gas, coolant, exhaust) to multiple stacks from a single structure, reducing the need for separate dedicated piping systems.
2Productivity
If manifold bifurcated pipes have different lengths to reach supply ports of multiple stacks, then all stacks can be connected, but uniform gas distribution to each stack cannot be achieved
Solution Approach 1:
The assembly manifold incorporates local flow control features such as adjustable flow distributors, variable restriction elements, or locally optimized passage geometries at different connection points. These local modifications compensate for distance variations and ensure that each stack receives a uniform and controlled amount of fuel gas, regardless of its position in the array.
Solution Approach 2:
The manifold design includes adjustable parameters such as flow distribution ratios, passage cross-sectional areas, and connection point positions that can be optimized to achieve uniform gas distribution. By varying these parameters locally at different manifold outlets, the system compensates for different pipe lengths and ensures equal gas supply to all stacks.
3Adaptability or versatility
If multiple separate manifold assemblies are used for each fuel cell stack, then each stack can be independently serviced, but the number of components increases and assembly becomes laborious
Solution Approach 1:
The assembly manifold is designed as a modular segmented structure where each stack connection point can be independently accessed or serviced. The manifold includes separable connection interfaces and modular flow distribution sections that allow technicians to service individual stacks without disassembling the entire manifold assembly, maintaining independent servicing capability while reducing overall component count.
Data Source
AI summary
A fuel cell system includes first and second fuel cell stacks which are juxtaposed to each other. An assembly manifold is attached to the first and second fuel cell stacks. A connection block is provided at a central position of the assembly manifold. A fuel gas supply port and a fuel gas discharge port are provided on a front surface of the connection block, and an oxygen-containing gas supply port and an oxygen-containing gas discharge port are provided on a back surface of the connection block. A fuel gas and an oxygen-containing gas are equally supplied to each of the first and second fuel cell stacks.