Fuel Cell Oxidant Gas Discharger Control
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Solution Overview
Problem
Existing fuel cell systems face inefficiencies in oxidant gas supply, leading to increased system size and power consumption, particularly due to the need for different dischargers and bypass paths in power generation and intermittent operations.
Innovation Solution
A fuel cell system with a first discharger and an opening-and-closing valve, controlled by a controller, that adjusts discharger usage based on power generation state, using a second discharger with higher pressure during power generation and a fan with lower pressure during intermittent operation, to efficiently supply oxidant gas while minimizing system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a compressor and a blower are used as two dischargers having different discharge pressures with a bypass flow path and bypass valve, then the oxidant gas can be efficiently supplied in different power generation states, but the system size increases
Solution Approach 1:
The single discharger is designed to perform multiple functions by operating in different modes (power generation operation and intermittent operation) and controlling oxidant gas flow through integrated flow paths. The discharger can supply oxidant gas both to the fuel cell stack directly and to the bypass flow path, eliminating the need for separate dischargers for different operating conditions.
Solution Approach 2:
The patent merges the functions of multiple dischargers (compressor and blower) into a single discharger unit. The oxidant gas flow path integrates both the main path to the fuel cell stack and the bypass path into one unified system, combining what were previously separate functional components into a single integrated discharger system.
2Quantity of substance
If a discharger having a large discharge pressure is used for power generation operation, then a large amount of oxidant gas can be supplied, but power consumption increases in intermittent operation
Solution Approach 1:
The discharger operates dynamically in two distinct modes: power generation operation for high oxidant gas supply during active power generation, and intermittent operation for reduced oxidant gas supply during low-power states. The controller dynamically switches between these modes based on the required power level, optimizing the balance between oxidant gas supply quantity and power consumption.
Solution Approach 2:
The system changes operational parameters by switching between power generation operation and intermittent operation. During intermittent operation, the controller reduces the oxidant gas supply amount and adjusts the discharge pressure accordingly, changing the operational state to match the reduced power requirements and minimize energy consumption.
3Productivity
If a bypass flow path is provided to supply oxidant gas efficiently, then the oxidant gas can be directed appropriately, but the system complexity and size increase
Solution Approach 1:
The single discharger serves multiple functions by controlling oxidant gas flow to both the fuel cell stack and the bypass flow path. The bypass flow path is integrated into the overall discharger system rather than being a separate independent path, allowing the same discharger to efficiently supply oxidant gas through multiple routes based on operational needs.
Solution Approach 2:
The bypass flow path is extracted and integrated as part of the single discharger system's internal structure. Rather than being an external addition that increases system complexity, the bypass path is incorporated into the discharger's flow control mechanism, allowing efficient oxidant gas distribution without proportionally increasing overall system 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
This solution enables efficient oxidant gas supply according to the fuel cell stack's power generation state, reducing power consumption and system size by optimizing discharger usage and valve operation, thereby enhancing the fuel cell system's efficiency and compactness.
Implementation Method 1
the opening-and-closing valve opens due to force generated by driving the second discharger and sucking and discharging the oxidant gas in the power generation operation, and closes due to force generated by driving the first discharger and sucking and discharging the oxidant gas in the intermittent operation
Data Source
AI summary
A fuel cell system includes a fuel cell stack, a first discharger, an opening-and-closing valve, a second discharger, a voltage detector, and a controller.