Hydrogen Heating Glow Plug Sensing for Flame and Mixture Control
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Solution Overview
Problem
Existing hydrogen-powered heating appliances face challenges in efficiently detecting and controlling combustion processes due to the unique properties of hydrogen flames, which are nearly invisible and emit less heat, and require multiple costly components like ignition electrodes, UV sensors, and lambda probes, leading to increased costs, complexity, and space requirements.
Innovation Solution
A single glow plug is used for ignition, flame detection, and gas-air mixture control by monitoring electrical voltage and resistance changes, integrating these functions into a single component to ensure reliable and space-saving operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple components (ignition electrode, UV sensor, lambda probe) are used to monitor combustion processes, then the reliability of flame detection is improved, but the device complexity and installation space increase
Solution Approach 1:
The patent combines the ignition electrode and flame detection functions into a single component. The ignition electrode serves dual purposes: initiating combustion and detecting flame presence through ionization current measurement, eliminating the need for separate UV sensors and lambda probes while maintaining reliable combustion monitoring
Solution Approach 2:
The ignition electrode is designed to perform multiple functions simultaneously: ignition, flame detection via ionization current, and combustion process monitoring. This multi-functional approach reduces the total component count while ensuring reliable hydrogen combustion control
2Temperature
If thermocouples are used to monitor flame temperature, then temperature measurement is improved, but the gas flow distribution through the burner is affected leading to localized overheating
Solution Approach 1:
The patent removes thermocouples from the burner structure entirely, extracting the temperature measurement function and replacing it with non-contact or minimally intrusive measurement methods that do not interfere with gas flow distribution or cause localized overheating
Solution Approach 2:
The patent uses ionization current as an intermediary parameter to indirectly monitor combustion conditions without direct thermal contact. This allows temperature and combustion state monitoring while avoiding the harmful thermal effects of inserting thermocouples into the burner
3Reliability
If thermocouples are attached to the burner surface, then flame presence detection is improved, but the durability is reduced due to insufficient resistance to flame contact
Solution Approach 1:
The patent employs the ignition electrode as a sacrificial or replaceable component designed to withstand flame exposure. By using a component specifically engineered for ignition conditions, the system accepts periodic replacement rather than attempting to use indefinitely durable but less effective materials
4Device complexity
If a single glow plug is used for ignition and detection, then the installation space and cost are reduced, but the measurement precision for hydrogen flame detection may be insufficient
Solution Approach 1:
The patent monitors changes in electrical parameters (current, voltage, resistance) of the glow plug to detect flame presence and characteristics. By analyzing parameter changes rather than relying on a single fixed threshold, the system achieves precise hydrogen flame detection with a single component
Solution Approach 2:
The system continuously monitors the electrical parameters of the glow plug and uses this feedback to determine flame presence, adjust ignition timing, and control combustion. This closed-loop feedback enables precise detection and control using a single multi-functional component
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 reduces costs, installation space, and complexity while enhancing reliability by combining ignition, detection, and mixture control functions in a single glow plug, ensuring efficient hydrogen combustion.
Implementation Method 1
Activating the glow plug by applying a predetermined electrical voltage
Implementation Method 2
Monitoring at least one electrical voltage and/or electrical resistance of the glow plug and detecting a sudden change in the electrical voltage and/or electrical resistance of the glow plug, wherein the sudden change exceeds a predetermined threshold and the sudden change is accompanied by the ignition of a flame in the combustion chamber
Implementation Method 3
Determining a flame temperature using the glow plug
Data Source
Figure 1
AI summary
A method for operating a hydrogen-powered heating appliance (1), wherein a mixture of a hydrogen-containing fuel gas and air is combusted in a combustion chamber (17) and a glow plug (12) is associated with the combustion chamber (17), the method comprising the following steps: a) detecting a combustible mixture in the combustion chamber (17), b) activating the glow plug (12) by applying a predetermined electrical voltage, c) monitoring at least one electrical voltage or electrical resistance of the glow plug (12) and detecting abrupt changes, d) determining a flame temperature using the glow plug (12). A heating appliance and a computer program are also specified.