Flame Detection Using Breakthrough Voltage in Hydrogen Burners
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Solution Overview
Problem
Conventional flame detection devices are not feasible for hydrogen-based systems and can be costly or suffer from delayed time response and reduced durability, particularly when detecting flames using ionization current or ultraviolet radiation sensors.
Innovation Solution
A flame detection device utilizing an ignition unit to generate a high-voltage electrical pulse across a spark gap located in a flame zone, determining breakthrough voltage to detect the presence of a flame based on the breakthrough voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ionization current measurement is used for flame detection, then the device can detect flames in natural gas, butane, and propane systems, but it is not feasible for hydrogen-based systems
Solution Approach 1:
The patent changes the detection parameter from ionization current to breakthrough voltage. By measuring the voltage required to create a spark across a gap in the flame zone, the system can detect flames in hydrogen-based systems where ionization current measurement is not feasible, thereby improving fuel compatibility while maintaining detection reliability.
2Reliability
If ultraviolet radiation sensors are used for flame detection, then the device can detect flames, but the cost increases and time response is delayed
Solution Approach 1:
The patent replaces optical detection systems (ultraviolet radiation sensors) with an electrical field-based system. By using electrodes to measure breakthrough voltage in the flame zone, the system achieves faster response time and lower cost while maintaining reliable flame detection capability.
3Device complexity
If conventional flame detection devices are used, then the device structure is simple, but durability is reduced
Solution Approach 1:
The patent employs electrodes that serve dual functions: they act as both ignition elements and detection sensors. The same components that ignite the fuel mixture also measure the breakthrough voltage to detect flame presence, eliminating the need for separate detection devices and thereby improving durability while maintaining structural simplicity.
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 device effectively detects flames in various fuel systems, including hydrogen, with improved durability and cost-effectiveness by monitoring breakthrough voltage characteristics.
Implementation Method 1
the high-voltage electrical pulse is provided to cause a spark event across the spark gap
Implementation Method 2
the flame detection device is configured to determine a breakthrough voltage associated with the spark event and to determine the presence of a flame in the flame zone based on the breakthrough voltage
Data Source
AI summary
A flame detection device that uses a breakthrough voltage across a pair of electrodes located in a flame zone to detect the presence of a flame. The flame detection device may be used with a burner that is part of a furnace in a central heating system for a home or building. Unlike conventional flame detection devices that measure ionization current in a flame, the flame detection device detects a flame by determining the voltage required for a spark event across a spark gap located in a flame zone (also referred to as the breakthrough voltage), and evaluating the breakthrough voltage and/or its various characteristics to detect the presence or absence of a flame. According to one example, the flame detection device includes a power supply, an ignition unit, output wires, insulators, and electrodes.