Fuel Gas Mixing Supply with Pressure-Priority Valve Control
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Solution Overview
Problem
The challenge is to develop a fuel gas supply apparatus for fuel cells that can efficiently operate using multiple fuel gases with unstable properties and supply amounts, while minimizing the need for extensive measurement and control configurations, which are costly and complex, especially when dealing with various types of fuel gases.
Innovation Solution
The apparatus includes multiple fuel gas supply sources, merging fuel gas supply lines with pressure-controlled valves that open and close based on set pressures, a mixed gas supply line to the fuel cell, and a second valve for adjusting flow rates, allowing for efficient operation with a simplified configuration by prioritizing fuel gas usage based on set pressures and preventing backflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors and control units are used to measure fuel gas composition and control flow rate, then stable operation of fuel cell is achieved, but system complexity and cost increase
Solution Approach 1:
The fuel gas supply system uses the inherent pressure differences between multiple fuel gas sources to automatically control flow distribution. Each fuel gas source has its own pressure control valve that automatically adjusts based on the mixed gas pressure, eliminating the need for external sensors and control units. The system serves itself by utilizing the natural pressure variations of different fuel gas sources (biogas, hydrogen, city gas) to maintain stable operation.
Solution Approach 2:
The patent replaces electronic sensing and control systems with a purely mechanical pressure-based control mechanism. Pressure control valves are mechanically linked to the mixed gas pressure, automatically adjusting valve openings based on pressure feedback without requiring electronic sensors, controllers, or power supply. This mechanical substitution dramatically simplifies the system while maintaining reliability.
2Adaptability or versatility
If multiple types of fuel gases are used for fuel cell, then fuel flexibility and stability are improved, but measurement and control configuration becomes more extensive and costly
Solution Approach 1:
The patent creates a universal fuel gas supply system that can handle multiple types of fuel gases (biogas, hydrogen, city gas, and their mixtures) through a single integrated configuration. The system uses common pressure control valves and mixing infrastructure that work with any fuel gas type, eliminating the need for separate measurement and control systems for each fuel gas. This multi-functional approach maintains adaptability while reducing overall system complexity.
Solution Approach 2:
Each fuel gas source automatically regulates its own flow contribution through pressure control valves that respond to mixed gas pressure. The system self-adjusts the composition of mixed gas from different fuel sources without external intervention, enabling flexible use of multiple fuel gases without extensive measurement and control configurations.
3Loss of energy
If priority-based fuel gas supply is implemented, then operational cost is reduced, but control mechanism complexity increases
Solution Approach 1:
The patent implements priority-based fuel gas supply by assigning different setting pressures to pressure control valves for each fuel gas source. High-priority fuels (biogas, hydrogen) have higher setting pressures that keep their valves open at lower mixed gas pressures, while low-priority fuels (city gas) have lower setting pressures. This parameter change approach achieves cost optimization through a simple mechanical pressure-based hierarchy without complex control mechanisms.
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 operation of fuel cells using multiple fuel gases with reduced complexity and cost, ensuring stable fuel supply and minimizing the use of high-priority fuels while effectively utilizing lower-priority fuels during shortages, thereby optimizing fuel cell operation and reducing operational costs.
Implementation Method 1
a plurality of first valves disposed on the plurality of fuel gas supply lines respectively, the first valves being capable of opening and closing on the basis of a pressure of a mixed gas of the plurality of fuel gases or a pressure of a mixed gas tank
Data Source
AI summary
A fuel gas supply apparatus for a fuel cell includes: a plurality of fuel gas supply sources, a plurality of fuel gas supply lines, a plurality of first valves disposed on the plurality of fuel gas supply lines, the first valves being capable of opening and closing on the basis of a pressure of a mixed gas of the plurality of fuel gases or a pressure of a mixed gas tank. A mixed gas supply line is provided for supplying the mixed gas containing at least one of the plurality of fuel gases to the fuel cell. The plurality of first valves open if the pressure of the mixed gas of the plurality of fuel gases or the pressure of the mixed gas tank becomes equal to or lower than a setting pressure, and the setting pressure is set to be different for each of the plurality of first valves.