Fuel Cell Hydrogen Circuit Switching to Prevent Starvation and Flooding
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Solution Overview
Problem
Existing fuel cell systems face issues such as hydrogen starvation, water flooding, and platinum catalyst degradation due to inefficient hydrogen circulation and supply, particularly during changes in vehicle loading and unloading conditions.
Innovation Solution
A fuel cell hydrogen gas circuit device with a parallel and series connection of an injector and hydrogen circulation pump, controlled by a sensor module and fuel cell controller, allows for dual-channel hydrogen supply to the inlet and outlet of the fuel cell stack, utilizing a hydrogen circulation pump to manage hydrogen flow and pressure, and employing a neural network algorithm to optimize pump speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a series connection of injector and hydrogen circulation pump is used, then hydrogen recovery and utilization rate is improved, but hydrogen starvation problem cannot be effectively solved
Solution Approach 1:
The patent implements dynamic switching between series and parallel connections of the injector and hydrogen circulation pump based on operating conditions. The controller adjusts the connection mode according to hydrogen demand, allowing the system to adapt between different operational states (series mode for recovery optimization, parallel mode for sufficient hydrogen supply during high demand), thereby resolving the contradiction between hydrogen recovery rate and supply stability.
Solution Approach 2:
The system changes the flow path configuration parameter (series/parallel connection) to optimize performance under different conditions. By switching the connection mode, the hydrogen flow rate and pressure distribution are adjusted, enabling the system to achieve both high recovery rates and adequate hydrogen supply for preventing starvation.
2Reliability
If the hydrogen circulation pump operates at high speed to increase hydrogen supply, then hydrogen starvation is prevented, but energy consumption increases
Solution Approach 1:
The controller dynamically adjusts the hydrogen circulation pump speed based on real-time hydrogen demand and operating conditions. During high demand periods, the pump operates at higher speeds to prevent hydrogen starvation. During low demand periods, the pump speed is reduced to minimize energy consumption, thus resolving the contradiction between supply sufficiency and energy efficiency.
Solution Approach 2:
The system varies the pump operating speed parameter according to operational requirements, achieving optimal balance between hydrogen supply reliability and energy consumption by matching pump output to actual hydrogen demand.
3Device complexity
If the injector operates alone to supply hydrogen, then device complexity is reduced, but water flooding and platinum degradation occur
Solution Approach 1:
The patent combines the injector and hydrogen circulation pump into a coordinated dual-mode system. The hydrogen circulation pump complements the injector by providing additional hydrogen supply capacity and enabling circulation functionality, thereby preventing water flooding and platinum degradation while maintaining manageable system complexity through integrated control.
Solution Approach 2:
The hydrogen circulation pump serves multiple functions: enhancing hydrogen supply during high demand, enabling hydrogen circulation for water management, and preventing both hydrogen starvation and water flooding. This multi-functionality improves fuel cell reliability without significantly increasing device complexity.
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 solution effectively alleviates hydrogen starvation, water flooding, and platinum degradation by optimizing hydrogen circulation efficiency, reducing pressure loss, and extending the life of components, while improving fuel efficiency and catalyst performance.
Implementation Method 1
The hydrogen circulation pump also incorporates a hydraulic resistance reduction design, which makes low flow resistance and high reflux ratio
Implementation Method 2
an outlet of the injector is connected to an inlet of the fuel cell stack through a third delivery pipeline
Implementation Method 3
An outlet of the fuel cell stack is connected to the hydrogen-water separator through a fourth delivery pipeline
Implementation Method 4
the hydrogen pressure stabilizing chamber is connected to a first inlet of the injector through a second delivery pipeline
Data Source
AI summary
A fuel cell hydrogen gas circuit device and a control method thereof are provided. The device includes a hydrogen cylinder, a hydrogen pressure stabilizing chamber, an injector, a hydrogen-water separator, and a hydrogen circulation pump. The hydrogen cylinder is connected to the first inlet of the injector through the hydrogen pressure stabilizing chamber, and the outlet of the injector is connected to the inlet of the fuel cell stack. The outlet of the fuel cell stack is connected to the hydrogen-water separator, and the gas outlet of the hydrogen-water separator is connected to the second inlet of the injector. The hydrogen-water separator is also connected to the inlet of the hydrogen circulation pump, and the outlet of the hydrogen circulation pump is connected to the inlet and outlet of the fuel cell stack through pipelines. It can effectively alleviate hydrogen starvation under loading conditions, water flooding, and platinum degradation.