Stack Gas Measurement Device Dilution Extraction
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Solution Overview
Problem
Existing stack gas monitoring devices face challenges in accurately measuring nitrogen oxides and sulfur oxides in real-time due to interference from water, carbon dioxide, and other chemicals, and require complex setups to maintain stable dilution ratios, which affects their accuracy and response time.
Innovation Solution
A monitoring device utilizing a dilution-extraction process with a sample probe that dilutes exhaust gases with air or nitrogen, reducing moisture and chemical interference, and employing chemiluminescence analysis with ozone reaction to measure nitric oxide concentrations, and ultra-violet fluorescence for sulfur dioxide detection, minimizing mechanical components and optimizing gas flow and temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If extractive or dilution extractive sampling is used to reduce interference from water and chemicals, then measurement accuracy improves, but device complexity and response time worsen
Solution Approach 1:
The patent extracts only the necessary sample gas from the exhaust stream using a sample probe, and immediately dilutes it with clean air or nitrogen. This extraction approach removes the harmful components (water, chemicals) by dilution rather than requiring complex separation systems, thereby improving measurement accuracy while limiting device complexity increase.
Solution Approach 2:
The patent introduces clean air or nitrogen as an intermediary dilution gas between the exhaust stream and the measurement chamber. This intermediary substance reduces the concentration of interfering chemicals and water vapor, improving measurement accuracy without requiring complex filtration or separation equipment.
2Measurement precision
If dilution extractive sampling is used to reduce chemical interference, then measurement accuracy improves, but response time worsens
Solution Approach 1:
The patent applies partial dilution rather than complete dilution of the exhaust stream. By using the exhaust gas itself as part of the sampling medium and only partially diluting with clean air or nitrogen, the system maintains sufficient analyte concentration for accurate measurement while minimizing the time required for dilution and mixing.
3Measurement precision
If stable dilution ratios are maintained through complex setups, then measurement accuracy improves, but device complexity and response time worsen
Solution Approach 1:
The patent employs a flow controller that automatically regulates the dilution ratio without requiring manual intervention or complex calibration systems. The system self-adjusts to maintain stable dilution ratios by controlling the flow rates of exhaust gas and dilution gas, thereby improving measurement accuracy while simplifying operation and reducing device 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 provides accurate, real-time monitoring of nitrogen oxides and sulfur oxides with reduced interference, maintaining stable dilution ratios and minimizing condensation, thus enhancing the accuracy and response time of the monitoring device for use in closed-loop systems.
Implementation Method 1
a sample gas is diluted with a dilution gas in an enclosed chamber
Implementation Method 2
detecting photons resulting from a chemiluminescence reaction of the ozone gas with a nitric oxide (NO) gas present in the sample gas
Implementation Method 3
ultra-violet fluorescence for sulfur dioxide detection
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A gas sampling device includes an analysis block defining a first portion of a chamber and a dilution block defining a second portion of the chamber. The sampling device includes an exhaust gas orifice at the first portion for withdrawing gas from the chamber in response to an applied suction, a sample gas orifice at the second portion to modify passage of a sample gas entering the chamber in response to the suction, and a dilution gas orifice at the second portion to modify passage of a dilution gas entering the chamber in response to the suction.