Combustion Exhaust Temperature Control Across Burner Capacity Levels
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Solution Overview
Problem
In combustion apparatuses with switchable combustion capacity, the detection of combustion exhaust temperature is affected by unburned air from unburned areas, leading to erroneous judgments of abnormal combustion, resulting in unnecessary control operations that degrade usability and delay heating-up of water.
Innovation Solution
A combustion apparatus with multiple combustion areas and a combustion exhaust temperature sensor that uses different judgment temperatures corresponding to each combustion capacity level for high-temperature abnormality judgments, allowing for precise control based on actual combustion conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single uniform judgment temperature is used for all combustion capacity levels, then the control system is simple, but erroneous judgment of abnormal combustion occurs due to unburned air dilution at different combustion levels
Solution Approach 1:
The patent applies parameter changes by setting different judgment temperatures corresponding to different combustion capacity levels. When combustion capacity changes, the judgment temperature parameter is adjusted accordingly. This resolves the contradiction by making the control system adaptive to different operating conditions, thereby maintaining high reliability without excessive complexity.
Solution Approach 2:
The patent implements dynamics by making the judgment temperature variable rather than fixed. The control system dynamically adjusts the judgment temperature based on the current combustion capacity level, allowing the system to adapt to changing conditions. This dynamic approach improves judgment accuracy while keeping the control logic manageable through predefined level-based adjustments.
2Device complexity
If safety control is performed based on a single uniform judgment temperature, then the control logic is simple, but unnecessary control operations are executed degrading usability and delaying water heating
Solution Approach 1:
By changing the judgment temperature parameter according to combustion capacity levels, the system avoids unnecessary control operations. The dynamic parameter adjustment ensures that safety controls are only triggered when actually needed, preventing false positives that would degrade usability or delay water heating.
3Reliability
If the judgment temperature is adjusted according to combustion capacity levels, then accurate safety control is achieved, but the control system becomes more complex
Solution Approach 1:
The patent implements a dynamic control system where the judgment temperature varies with combustion capacity levels. This dynamic approach achieves accurate safety control by adapting to different operating conditions. The complexity is managed through a systematic level-based structure rather than arbitrary complexity.
Solution Approach 2:
The system changes the judgment temperature parameter based on combustion capacity levels, enabling accurate safety control. While this increases complexity compared to a fixed temperature system, the complexity is structured and manageable through predefined levels, providing a reasonable trade-off for significantly improved reliability.
4Ease of operation
If a single judgment temperature is used, then the system is easy to operate, but combustion abnormalities may be missed or false alarms occur reducing efficiency
Solution Approach 1:
The dynamic adjustment of judgment temperature based on combustion capacity levels improves water heating efficiency by preventing false alarms and missed detections. The system remains easy to operate through automatic adaptation, requiring no manual intervention while significantly improving productivity through accurate real-time monitoring.
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 approach prevents erroneous shutdowns or gas reductions, ensuring timely heating-up of water by tailoring safety processes to actual combustion conditions, thus enhancing usability and efficiency.
Implementation Method 1
a combustion exhaust temperature sensor for detection of the temperature of combustion exhaust
Implementation Method 2
Each of the combustion areas is formed of a single combustion burner or of a plurality of combustion burners arranged in parallel
Data Source
AI summary
According to the required amount of heating, a controller of a combustion apparatus exercises selective on-off switching control on capacity control switching valves for the supplying of gas to three different combustion areas partitioned respectively by a group of three combustion burners, a group of five combustion burners and a group of nine combustion burners, whereby the three combustion areas can selectively be burned, thereby the combustion capacity is changed and switched to any of a plurality of combustion capacity levels. A combustion exhaust temperature sensor is disposed in the vicinity of the inlet of an exhaust stack. Judgment temperatures corresponding respectively to combustion capacity levels for combustion exhaust high-temperature abnormality judgment are set. If the detected combustion exhaust temperature exceeds the judgment temperature corresponding to a current combustion capacity level, this provides a notification indicative of the occurrence of an abnormality while combustion is forcibly stopped.