Process Gas Analyzer Interface with Segmented Purging Flow
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Solution Overview
Problem
Conventional process interfaces for gas analyzers require high purging gas consumption to prevent contamination and condensation on windows, leading to increased costs and measurement disturbances due to turbulence.
Innovation Solution
A process interface with an annular part having a convex outer side that divides the purging gas flow into a smaller region for the window and a larger region for the purging tube, optimizing gas distribution to minimize turbulence and condensation while reducing structural complexity and gas usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high purging gas flow is used to keep windows free from contaminants, then window cleanliness is improved, but purging gas consumption increases and measurement is disturbed by turbulence
Solution Approach 1:
The purging gas flow is segmented into two separate flows by the annular part: a first portion directed toward the window for cleaning, and a second portion directed into the purging tube for maintaining pressure and preventing condensation. This segmentation allows each portion to perform its specific function efficiently without the negative effects of the other.
Solution Approach 2:
Different regions of the purging gas flow are given different qualities or directions. The first portion is directed locally at the window surface to provide cleaning action, while the second portion is directed into the purging tube to maintain positive pressure. Each region receives the appropriate flow characteristics for its specific function.
2Reliability
If high purging gas flow is used to prevent condensation on windows, then condensation prevention is improved, but measurement precision deteriorates due to turbulence
Solution Approach 1:
The purging gas flow is segmented into two separate flows by the annular part: a first portion directed toward the window for cleaning, and a second portion directed into the purging tube for maintaining pressure and preventing condensation. This segmentation allows each portion to perform its specific function efficiently without the negative effects of the other.
Solution Approach 2:
The harmful turbulent effects are extracted or separated from the useful functions. By directing the second portion of purging gas into the purging tube rather than allowing it to mix with the first portion near the window, the solution extracts the condensation-prevention function while minimizing turbulence in the measurement path.
3Loss of substance
If complex purging gas distribution system is used to reduce purging gas consumption, then purging gas consumption is reduced, but device complexity increases
Solution Approach 1:
The purging gas flow is segmented into two separate flows by the annular part: a first portion directed toward the window for cleaning, and a second portion directed into the purving tube for maintaining pressure and preventing condensation. This segmentation allows each portion to perform its specific function efficiently without the negative effects of the other.
Solution Approach 2:
The annular part is positioned at a specific distance from the window (5-20 mm) to optimize the flow distribution. This parameter change enables effective segmentation of the purging gas flow while maintaining a simple structural design.
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 solution effectively keeps windows clean, prevents steam condensation, and maintains a homogeneous gas flow, reducing purging gas consumption and measurement disturbances, while simplifying the mounting process using a circlip for secure and cost-effective assembly.
Implementation Method 1
The purging gas is chosen such that its spectral absorption lines lie outside the absorption lines of the process gas that are used for the measurement. The purging gas leaves from the open ends of the opposing purging tubes, so that the length of the measuring path for the absorption measurement of the process gas is determined by the distance between the open ends of the two purging tubes.
Implementation Method 2
In the case of a laser spectrometer, for example, the light is generated wavelength-selectively and is detected in a broadband range. As a difference from this, in the case of a non-dispersive infrared (NDIR) gas analyzer, for example, the light is generated in a broadband range and is detected wavelength-selectively.
Data Source
AI summary
A process interface of a process gas analyzer operating by a transmitted light method includes a purging tube, which extends between an optoelectronic element and an interior of a plant part carrying a process gas, wherein the purging tube is closed off, at its end opposite from the optoelectronic element by a window, in the vicinity of which a purging gas feed enters the purging tube, where an annular part is arranged in the interior of the purging tube opposite the entrance of the purging gas feed and is coaxial in relation to the purging tube, and the part has a convex outer side, the vertex line of which divides the entrance of the purging gas feed into a smaller region, open toward the window, and a larger region, open toward the interior of the plant part.