In-situ Oxygen Analyzer with Solid Electrolyte Sensor
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Solution Overview
Problem
Existing oxygen analyzer technologies struggle to accurately measure oxygen levels in combustion processes due to interference from non-oxygen gases like carbon monoxide and combustibles, leading to inefficiencies and safety concerns.
Innovation Solution
An improved oxygen analyzer system that includes a zirconia-based oxygen sensor with catalytic beads, capable of detecting changes in oxygen concentration over time to quantify carbon monoxide and unburned fuel presence, thereby enhancing combustion control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional oxygen sensors are used in combustion processes, then oxygen concentration can be measured, but measurement precision deteriorates due to interference from non-oxygen gases like carbon monoxide and combustibles
Solution Approach 1:
The patent segments the measurement function by using multiple sensors: a primary oxygen sensor for oxygen concentration measurement and a secondary sensor for detecting interfering gases like carbon monoxide and combustibles. This segmentation allows the system to distinguish between oxygen signals and interference signals, thereby improving measurement precision while accounting for harmful factors.
Solution Approach 2:
The patent introduces an intermediary processing system that receives signals from both the oxygen sensor and the interfering gas sensor. This intermediary system processes and differentiates the signals to compensate for interference effects, enabling accurate oxygen measurement even in the presence of non-oxygen gases.
2Object-generated harmful factors
If combustion efficiency is maximized to reduce emissions, then harmful gas production decreases, but measurement reliability deteriorates due to increased interference from combustibles
Solution Approach 1:
The patent implements a feedback mechanism where the secondary sensor continuously monitors interfering gases and provides correction signals to the oxygen measurement system. This feedback loop maintains measurement reliability even when combustion conditions change and interfere with the primary oxygen sensor, allowing the system to operate at maximum efficiency while compensating for variable interference levels.
Solution Approach 2:
The patent changes the measurement parameters by monitoring not only oxygen concentration but also the concentration of interfering substances. By measuring multiple parameters simultaneously and analyzing their relationships, the system can distinguish between actual oxygen variations and variations caused by combustion efficiency changes, thereby maintaining reliability under different operating conditions.
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 system provides precise and reliable measurements of oxygen concentration, enabling effective detection of carbon monoxide and unburned fuel, which improves combustion efficiency, safety, and stability.
Implementation Method 1
The response of the sensor to differential oxygen concentrations with fixed partial pressure on the reference electrode, e.g., using air, can be calculated using the Nernst Equation
Implementation Method 2
The oxygen sensor has catalytic beads that are configured to be disposed between the process gas and the sensing electrode
Data Source
AI summary
An improved oxygen analyzer includes a controller configured to receive an oxygen sensor signal and provide an oxygen concentration output. A probe is configured to extend into a source of combustion process gas. An oxygen sensor is disposed within the probe and has a sensing electrode mounted to one side of a solid electrolyte and a reference electrode mounted to an opposite side of the solid electrolyte. The oxygen sensor has catalytic beads that are configured to be disposed between the process gas and the sensing electrode. Measurement circuitry is operably coupled to the oxygen sensor and the controller and is configured to provide the controller with the oxygen sensor signal based on an electrical response of the oxygen sensor. The controller is configured to detect a behavior of the oxygen sensor concentration output over time to provide at least one ancillary output.