Gas Sampling Device Pressure Reduction for Condensation Control
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Solution Overview
Problem
Sampling hot and humid gases for analysis is challenging due to condensation issues, which can alter gas composition and lead to high maintenance and operational costs, as existing devices often require heating, drying, or dilution, thereby denaturing the samples.
Innovation Solution
A gas sampling method and device that uses a calibrated sonic-type expansion nozzle and pressure reduction to maintain the dew point below the pipe and analysis device temperature, eliminating the need for heating or drying, and incorporating a filter to remove solid particles, with a suction device to regulate pressure and prevent condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the sampled gases are maintained at a high temperature to prevent condensation, then condensation is avoided, but manufacturing cost and energy consumption increase significantly
Solution Approach 1:
The invention changes the pressure parameter of the gas sample from atmospheric pressure to reduced pressure (vacuum). By lowering the pressure, the dew point of the water vapor in the sampled gas is reduced below the temperature of the sampling device, eliminating condensation without requiring high temperature maintenance. This resolves the contradiction by avoiding energy-intensive heating while preventing condensation through pressure modification.
2Object-affected harmful factors
If drying devices or membranes are used to remove water vapor, then condensation is prevented, but the sample composition is modified and maintenance costs increase
Solution Approach 1:
Instead of using drying devices or membranes that physically remove or alter water vapor, the invention changes the pressure parameter to keep water vapor in a stable, non-condensing state. This maintains the original composition of the gas sample including all water-soluble molecules, while preventing condensation. The sample integrity is preserved because no substances are added or removed, only the pressure condition is modified.
3Object-affected harmful factors
If dilution with another gas is used to prevent condensation, then condensation is avoided, but the sample composition is modified and analysis sensitivity requirements increase
Solution Approach 1:
The invention avoids dilution entirely by changing the pressure parameter. By operating at reduced pressure, the gas sample maintains its original composition without any added gases. This eliminates the need for highly sensitive analysis devices that would be required to detect trace components in a diluted sample, while still preventing condensation of water vapor.
4Object-affected harmful factors
If complex heating systems with temperature regulators are used, then condensation is prevented, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention eliminates complex heating systems by changing the pressure parameter. The sampling device operates at reduced pressure, which automatically prevents condensation without requiring temperature control. This simplifies the device architecture, removing heaters, temperature sensors, and control systems, thereby reducing manufacturing cost and device complexity while effectively preventing condensation.
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 approach prevents condensation, maintains sample integrity, reduces manufacturing and maintenance costs, and simplifies the sampling device design, while allowing for precise gas flow without denaturing the sample, thus improving the accuracy and efficiency of gas analysis.
Implementation Method 1
lowering the pressure of the gases sampled being carried out by sucking the gases sampled in the first pipe via a second pipe in communication with the first pipe through the analysis device
Implementation Method 2
maintain in the first and second pipes and in the analysis device a pressure capable of maintaining the dew point of the gases sampled at a value lower than the temperature of the first and second pipes and of the analysis device
Implementation Method 3
regulating a suction power of the sampled gases applied to the second pipe, for keep the pressure in the first pipe constant
Implementation Method 4
lowering the pressure of the gases sampled being carried out by sucking the gases sampled in the first pipe via a second pipe
Implementation Method 5
incorporating a filter to remove solid particles
Data Source
Figure 1~2
AI summary
The invention relates to a gas sampling device that includes a gas sampling probe (1), an exploitation device (EXD) for the sampled gases, a duct (2) for conveying the gases sampled by the probe to the exploitation device, and means (12, 3) for lowering the pressure of the sampled gases in the duct so as to lower the dew point of the sampled gases, wherein the pressure lowering means includes an expansion nozzle (12) provided in the probe and communicating with the duct, and a suction device (3) of the sampled gases in the duct across the exploitation device. The invention can be used for the analysis of hot air charged with steam.