Fuel Cell Gas Crossover Control for Faster Anode Purging
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Solution Overview
Problem
The existing fuel cell systems take a long time to discharge anode gas due to the prolonged connection time for inert gas cylinders, which delays the deployment of vehicles equipped with these systems.
Innovation Solution
A fuel cell system that includes a connection pipe connecting the oxidant gas supply pipe and fuel gas supply pipe, with a control unit that manages the flow of gases by setting voltage thresholds to control the supply of oxidant gas to the cathode and anode, allowing for efficient discharge of fuel gas by introducing oxidant gas into the fuel gas system through a connection valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inert gas cylinder connection method is used to discharge anode gas, then fuel gas discharge is achieved, but the connection time is long which reduces productivity
Solution Approach 1:
The patent applies preliminary action by pre-connecting the oxidant gas supply pipe to the fuel gas supply pipe through the connection pipe before the fuel cell operation ends. This allows the oxidant gas to be ready to flow into the anode side immediately when the connection valve opens, eliminating the need for external inert gas cylinder connection and significantly reducing the time loss during fuel gas discharge.
2Ease of operation
If inert gas cylinder is used for fuel gas discharge, then discharge function is achieved, but device complexity increases due to additional connection requirements
Solution Approach 1:
The patent merges the oxidant gas supply system with the fuel gas discharge function by providing a connection pipe that links the oxidant gas supply pipe to the fuel gas supply pipe. This integration allows the oxidant gas to serve dual purposes: supplying oxygen to the cathode during normal operation and flushing out fuel gas from the anode during shutdown, thereby simplifying the overall system by eliminating the need for separate inert gas cylinder connection infrastructure.
3Extent of automation
If connection valve is controlled by voltage thresholds, then automated control is achieved, but measurement precision requirements increase
Solution Approach 1:
The patent implements feedback control by using the voltage sensor to continuously monitor the fuel cell voltage and comparing it against predetermined threshold values stored in the control unit. When the voltage drops below the first threshold, the control unit automatically opens the connection valve to allow oxidant gas to flush the anode. When voltage recovers above the second threshold, the valve closes automatically. This feedback mechanism enables fully automated control of the gas supply system based on real-time voltage measurements.
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 solution improves the speed of fuel gas discharge, reduces the need for inert gas cylinders, and shortens the time required for vehicle deployment by optimizing gas flow and discharge processes.
Implementation Method 1
a fuel cell, an oxidant gas supply pipe, a fuel gas supply pipe, a connection pipe, a voltage sensor and a control unit; wherein the connection pipe connects the oxidant gas supply pipe and the fuel gas supply pipe
Data Source
AI summary
To provide a fuel cell system capable of improving a rate of discharging fuel gas. A fuel cell system, wherein the fuel cell system comprises a fuel cell, an oxidant gas supply pipe, a fuel gas supply pipe, a connection pipe, a voltage sensor and a control unit; wherein the connection pipe connects the oxidant gas supply pipe and the fuel gas supply pipe; wherein a connection valve is disposed in the connection pipe; wherein the voltage sensor is configured to measure a voltage of the fuel cell; wherein the control unit is configured to control opening and closing of the connection valve; and wherein the control unit is configured to preliminarily store a first threshold value and a second threshold value of the voltage of the fuel cell.