Chemiluminescence NOx Meter Ozone Generator Humidity Control
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Solution Overview
Problem
Conventional chemiluminescence type nitrogen oxide concentration meters face accuracy issues due to metal contamination in the ozone generator, which occurs when air humidity is low, leading to reduced detection accuracy of nitrogen oxide concentrations.
Innovation Solution
A chemiluminescence type nitrogen oxide concentration meter is designed with a dehumidifier, adsorption apparatus, and bypass flow path to generate ozone using a mixed gas with controlled humidity, preventing metal contamination and ensuring accurate nitrogen oxide concentration measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If air with low humidity is supplied to the ozone generator, then a large amount of ozone is generated, but metal contamination occurs from the conductor surface
Solution Approach 1:
The patent changes the humidity parameter of the air supplied to the ozone generator by introducing moisture through a moisture source (such as a water reservoir or humidification device). This adjusts the air humidity to an optimal range that prevents metal contamination while maintaining efficient ozone generation, resolving the contradiction between ozone quantity and contamination prevention.
Solution Approach 2:
The patent introduces moisture as an intermediary substance between the air supply and the ozone generator. This moisture layer acts as a protective mediator that prevents direct contact between the dry air and the conductor surface, thereby preventing metal contamination while allowing ozone generation to proceed efficiently.
2Object-affected harmful factors
If air with high humidity is supplied to the ozone generator, then metal contamination is suppressed, but ozone generation efficiency decreases
Solution Approach 1:
The patent precisely controls the humidity parameter of the supplied air by regulating the amount of moisture introduced. Instead of using overly humid air that would reduce efficiency, the system adjusts humidity to an optimal range that balances contamination prevention with maintained ozone generation efficiency.
Solution Approach 2:
The patent applies partial humidification rather than full saturation. By introducing just enough moisture to prevent metal contamination without over-humidifying the air, the system achieves the minimum necessary protection while avoiding the efficiency loss that would result from excessive humidity.
3Measurement precision
If dehumidification apparatus is added to control humidity, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent uses moisture as a simple intermediary substance introduced through a relatively simple moisture source device. This approach achieves the necessary humidity control for accurate measurements without requiring complex dehumidification apparatus, thereby maintaining measurement precision while minimizing device complexity.
Solution Approach 2:
The system uses a simple moisture source that operates autonomously to maintain appropriate humidity levels. Rather than implementing complex active dehumidification control systems, the design relies on a self-regulating moisture introduction mechanism that maintains measurement accuracy with minimal complexity.
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 efficiently generates ozone while suppressing metal contamination, allowing for accurate detection of nitrogen oxide concentrations by maintaining proper humidity levels in the ozone generator, thereby enhancing measurement accuracy.
Implementation Method 1
The dehumidifier dehumidifies air by cooling the air
Implementation Method 2
The adsorption apparatus adsorbs moisture in the air dehumidified by the dehumidifier
Implementation Method 3
When a voltage is applied to the electrode, silent discharge occurs between the dielectric and the conductor, and a part of oxygen in the atmosphere becomes ozone
Implementation Method 4
in the reaction tank, the sample gas and ozone are chemically reacted to generate light
Data Source
AI summary
In a chemiluminescence type nitrogen oxide concentration meter, a mixed gas of air with its moisture adsorbed by an adsorption apparatus and air that through a fifth flow path without the adsorption apparatus in between is flown into an ozone generator. Therefore, ozone can be generated using air of proper humidity in the ozone generator 7. As a result, ozone can be efficiently generated while suppressing occurrence of metal contamination in the ozone generator 7. Then, in the reaction unit 8, nitrogen oxides in the sample gas are made to appropriately show chemiluminescence using the ozone, and in the detector 9, the intensity of light generated in the reaction unit 8 is detected. Furthermore, in the control unit 10, the concentration of nitrogen oxides in the sample gas is measured, based on the intensity of light detected by the detector 9.