Gas Burner Ionization Control for Impurity-Induced Measurement Errors
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Solution Overview
Problem
Existing methods for operating gas burners based on ionization current measurements fail to accurately account for combustible impurities, leading to inaccuracies in setting the composition and quantity of the gas/combustion air mixture, especially when impurities are present in large quantities.
Innovation Solution
Adjust the composition and quantity of the gas/combustion air mixture using the ionization current from an ionization sensor, with adjustments made only when impurities are below a certain limit value, and maintaining the composition/quantity unchanged when impurities exceed a second limit value, to prevent inaccuracies in the measurement signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ionization current is used to continuously adjust the composition and quantity of the gas/combustion air mixture, then the operational responsiveness and adaptability of the gas burner is improved, but measurement inaccuracies occur when combustible impurities are present in large quantities
Solution Approach 1:
The control method dynamically switches between continuous adjustment mode and fixed composition mode based on impurity levels. When impurities are below the first limit value, continuous adjustment is enabled for high responsiveness. When impurities exceed the first limit value, the system transitions to fixed composition mode to prevent measurement inaccuracies, and only resumes continuous adjustment when impurities fall below the second limit value.
Solution Approach 2:
The system changes the operational parameters of the gas burner based on impurity levels. The composition adjustment is enabled or disabled as a parameter change, and the switching between different operational modes (continuous adjustment vs. fixed composition) is controlled by comparing impurity levels against threshold values.
2Adaptability or versatility
If the composition of the gas/combustion air mixture is continuously adjusted based on ionization current, then the adaptability to varying operating conditions is improved, but the reliability of the control system deteriorates due to inaccurate measurements in the presence of impurities
Solution Approach 1:
The system dynamically adapts its control strategy based on impurity levels. When impurities are low, continuous adjustment provides high adaptability. When impurities exceed thresholds, the system switches to fixed composition mode to maintain reliability, effectively managing the trade-off between adaptability and reliability through conditional mode switching.
Solution Approach 2:
The system uses feedback from ionization current measurements to detect impurity levels and switches control modes accordingly. The feedback mechanism compares measured impurity levels against threshold values to determine whether to enable or disable continuous composition adjustment, ensuring reliable operation across different contamination conditions.
3Ease of operation
If the ionization current is used for setting the gas/combustion air mixture composition, then the ease of operation is improved, but the manufacturing precision of the mixture composition deteriorates when impurities are present
Solution Approach 1:
The system dynamically adjusts the level of automatic control based on impurity levels. When impurities are below the first limit value, automatic composition adjustment is enabled for ease of operation. When impurities exceed the first limit value, the system switches to fixed composition mode to ensure manufacturing precision, automatically resuming ease of operation when impurities fall below the second limit value.
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
Enhances the quality of setting the composition and quantity of the gas/combustion air mixture supplied to the gas burner, reducing inaccuracies caused by combustible impurities and improving operational reliability.
Implementation Method 1
check the presence of a flame in the gas burner using an ionization current that is provided by an ionization sensor
Data Source
Figure 1
Figure 2~3
AI summary
The method involves determining whether gas-combustion air mixture and a combustion chamber (11) of a gas burner (10) comprise contamination, from ionization current that is provided by an ionization sensor (13). Composition and/or amount of gas-combustion air mixture are adjusted based on the current when the contamination is less than a threshold value. The composition and/or amount of air mixture are not adjusted based on the current when the contamination is greater than another threshold value, which is larger than the former threshold value.