Diluting Sampler Laminar Flow for High-Temperature Gas Analysis
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Solution Overview
Problem
Existing sampling methods for high-temperature combustion processes face material loss and analysis errors due to condensation and accumulation of sample materials on cooler surfaces, exacerbated by temperature differences and the complexity of maintaining high-temperature conditions during sample transport.
Innovation Solution
A diluting sampler with a gas-permeable first jacket and an impermeable second jacket forms a dilution gas space, where the dilution gas is introduced under higher pressure to mix with the sample, and heat from the sample space is used to warm the dilution gas, forming a laminar protection flow that prevents sample contact with cool surfaces, reducing material loss and condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dilution gas is introduced at higher pressure to cool and dilute the sample quickly, then the sample cooling efficiency is improved, but material condensation and accumulation on cooler surfaces increases
Solution Approach 1:
A heating element is introduced as an intermediary component between the dilution gas and the sample. This heating element warms the dilution gas before it contacts the sample, mediating the thermal interaction to prevent excessive cooling that causes condensation. The heating element acts as a buffer that controls the temperature gradient, allowing efficient dilution without the harmful side effect of material accumulation on surfaces.
2Device complexity
If the sampler structure is simplified without external heating means, then the device complexity is reduced, but the ability to prevent sample condensation on cool surfaces deteriorates
Solution Approach 1:
The sampler utilizes the kinetic energy and temperature of the incoming sample flow itself to heat the dilution gas. The sample flow passes through or near the dilution gas introduction region, transferring heat to the dilution gas without requiring external heating means. This self-service mechanism allows the system to maintain sample temperature and prevent condensation using only the resources already present in the system, achieving both simplicity and effectiveness.
Solution Approach 2:
The system changes the temperature parameter of the dilution gas dynamically by utilizing the sample flow's thermal energy. Instead of introducing cold dilution gas that causes condensation, the sample flow heats the dilution gas to a temperature closer to the sample temperature. This parameter change prevents the temperature gradient that leads to material accumulation, solving the contradiction between simplicity and condensation prevention.
3Productivity
If the dilution gas space is maintained at higher pressure than the sample channel, then the dilution efficiency is improved, but the temperature difference between dilution gas and sample increases
Solution Approach 1:
The system performs preliminary heating of the dilution gas before it enters the high-pressure dilution zone. By pre-heating the dilution gas using the sample flow's thermal energy, the temperature difference between the dilution gas and sample is reduced before mixing occurs. This preliminary action ensures that when the dilution gas is introduced at higher pressure for efficient mixing, it does not cause excessive cooling and condensation of the sample.
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 significantly reduces material losses and maintains accurate sample composition by minimizing contact between the sample and cool surfaces, allowing efficient sampling from high-temperature processes without external heating means, thereby improving analysis reliability.
Implementation Method 1
a gas permeable first jacket (7) forming a sample channel (8) into which the second end (5) of the sampling tube opens
Implementation Method 2
heat from the sample space is used to warm the dilution gas
Implementation Method 3
forming a substantially laminar protection flow disposed longitudinally to the sample channel and enclosing the flow of sample
Implementation Method 4
heat from the sample space is used to warm the dilution gas
Data Source
AI summary
In the method, for collecting and diluting a gaseous sample disposed at a temperature substantially higher than the normal temperature from a sample space (2), a flow of sample is collected into a sampling tube (3); the flow of sample is introduced from the sampling tube into a sample channel (8) formed by a gas permeable first jacket (7); dilution gas is introduced into a dilution gas space (10) formed by a second jacket (9) enclosing the first jacket and connected by its end to the sampling tube, and further from it, through the first jacket into the sample channel; and heat is conducted from the sample space (2) into the dilution gas space (10) for warming up the dilution gas that comes into contact with the sampling tube (3). According to the invention, in the method, a substantially laminar protection flow, which encloses the flow of sample being released from the sampling tube (3) into the sample channel (8) and is disposed longitudinally to the sample channel, is formed from the warmed up dilution gas.