Optical Gas Analysis Housing with Filtered Inlet
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Solution Overview
Problem
Existing optical in-situ gas analysis devices face challenges with high particle loads causing light absorption and scattering, leading to measurement interference, and require filters that compromise gas exchange and test gas efficiency, while extractive setups are complex and slow.
Innovation Solution
A device with a gas-tight housing and a filter arrangement that maintains similar process conditions to the gas duct, allowing active gas conveyance and high filter performance, reducing particle interference and improving response time, and incorporating a gas delivery system to minimize test gas consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a porous filter is used to keep particles away from the measurement section, then measurement accuracy is improved, but gas exchange is hindered and response time increases
Solution Approach 1:
The device divides the system into two distinct zones: a measurement section isolated from particles by a porous filter, and a particle-laden gas flow in the duct. This segmentation allows the filter to protect the measurement section while the gas conveying device maintains overall gas exchange through the system.
Solution Approach 2:
A porous filter serves as an intermediary element between the particle-containing gas flow and the measurement section. The filter allows gas molecules to pass through while blocking particles, thus enabling measurement accuracy without completely blocking gas exchange.
2Reliability
If a porous filter is used to filter particles, then particle interference is reduced, but response time increases due to limited gas passage
Solution Approach 1:
A gas conveying device (vacuum pump or pressure source) is introduced to actively drive gas flow through the porous filter and into the measurement section. This pneumatic assistance overcomes the flow resistance of the filter, maintaining high particle filtering while restoring rapid gas exchange and improving response time.
3Loss of substance
If a filter with low gas permeability is used, then test gas consumption is reduced, but gas exchange is hindered
Solution Approach 1:
The gas conveying device creates a controlled flow regime where gas (including test gas) is actively drawn through the low-permeability filter. This self-service mechanism ensures that the filter's low permeability is compensated by the active gas conveyance, maintaining both test gas conservation and adequate gas exchange for calibration operations.
4Loss of time
If in-situ measurement is performed directly in the gas duct, then response time is improved, but particle interference causes measurement failure
Solution Approach 1:
The measurement section is extracted from the particle-laden gas environment and placed inside a protected housing. A porous filter extracts particles from the gas flow while allowing measurement gas to reach the measurement section, thus removing the harmful particle interference while maintaining the in-situ measurement advantage of rapid response.
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 enables accurate, reliable in-situ gas analysis with improved response time and reduced test gas consumption, while maintaining process conditions, and allows for efficient contamination compensation and condensate management.
Implementation Method 1
measured by optical transmission or light scattering
Implementation Method 2
hydrogen sulfide has a very broad absorption, as does ultrafine dust
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The device according to the invention for optical in-situ analysis of a measuring gas component of a measuring gas comprises a gas guide channel 26 in which the measuring gas 28 is guided, a light transmitter 12 for emitting a light beam into a measuring section 16 located in the gas guide channel, a light receiver 22 for receiving scattered and/or transmitted light from the measuring section and an evaluation unit 24 for determining data of the measuring gas component from the received light intensity.In order to provide a device with which improved in-situ gas analysis is possible, it is proposed that the measuring section be arranged in a gas-tight housing 30 which has at least one opening 34 to the gas guide channel in which a filter 35 is arranged and the pressure in the housing is maintained by a gas supply device at a pressure that is slightly lower than the pressure in the gas guide channel, so that the measuring gas is present in the measuring section at almost the same pressure as that in the gas guide channel.