Dynamic Ionization Voltage for Flame Detection
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Solution Overview
Problem
Existing flame monitoring systems face measurement inaccuracies above saturation voltage, and non-linear effects during burner start-up and modulation make reliable flame detection challenging, especially in combustion-controlled systems where high accuracy is required.
Innovation Solution
A method and device that vary the measurement voltage between a value above and below the saturation voltage, allowing for optimal resolution during burner start-up and modulation phases, enabling reliable flame detection and precise assessment of flame properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a measuring voltage above saturation voltage is used, then flame detection reliability is improved during start-up, but measurement precision deteriorates due to saturation effects
Solution Approach 1:
The patent applies dynamics by making the measuring voltage adjustable and variable rather than fixed. The system dynamically adapts the measuring voltage level based on the burner's operational state: using higher voltages during start-up for reliable flame detection, and switching to lower voltages during steady-state operation for precise combustion control measurements.
Solution Approach 2:
The patent changes the parameter of measuring voltage from a static value to a dynamic value that varies with operational conditions. By adjusting the voltage parameter according to the burner state (start-up vs. modulation), the system optimizes both detection reliability and measurement precision for different phases of operation.
2Measurement precision
If a measuring voltage below saturation voltage is used, then measurement precision is improved for combustion control, but flame detection reliability deteriorates during start-up due to non-linear effects
Solution Approach 1:
The system dynamically adjusts the measuring voltage based on operational phase. During start-up when reliability is critical, higher voltages are applied. During combustion control when precision is critical, lower voltages are used. This dynamic adaptation resolves the contradiction between reliability and precision requirements.
Solution Approach 2:
The measuring voltage parameter is changed according to the burner's operational state. The system transitions from higher voltage operation during start-up to lower voltage operation during steady-state combustion control, optimizing performance for each phase.
3Device complexity
If a single fixed measuring voltage is used, then device complexity is reduced, but adaptability deteriorates for different operating states
Solution Approach 1:
The patent implements a dynamic voltage selection mechanism that automatically adapts the measuring voltage to the current operational state. This dynamic capability provides high adaptability for different operating conditions while maintaining relatively simple device architecture through automated control logic.
Solution Approach 2:
The system changes the measuring voltage parameter based on detected operational states. By automatically adjusting this key parameter, the system achieves versatility across different operating conditions without requiring multiple dedicated hardware systems.
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 ensures accurate flame detection during start-up and modulation, preventing errors like late flame detection or insufficient evaluation of flame properties, while allowing for precise regulation of air/fuel ratios and combustion conditions.
Implementation Method 1
These systems utilize the rectifying effect of the flame, operating on the so-called ionization principle. An alternating voltage is applied between two electrodes. The instantaneous power output of the burner is determined by the volume filled by the flame. The magnitude of the direct current component therefore provides a measure of the flame intensity.
Data Source
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AI summary
The method involves producing a measuring voltage (12a), which is larger than a saturation voltage for producing an ionization current (16a) at an ionization electrode (16) of the flame monitoring system in the primary operating condition of the burner (22) by a device (12) for producing the measuring voltage in a voltage range, which varies from a voltage level above the saturation voltage and a voltage level below the saturation voltage. An independent claim is also included for a device for use in a flame monitoring system for producing a measuring voltage for flame detection corresponding to ionization current measurement.