Hydrogen Flame Ionization Detector Nozzle Thermal Stability
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Solution Overview
Problem
The reproducibility of analysis results in FID detectors deteriorates when analyzing high-concentration samples due to the expansion of the nozzle's inner diameter under the influence of the hydrogen flame, causing fluctuations in gas flow rate and detection sensitivity.
Innovation Solution
A hydrogen flame ionization detector design that includes a nozzle with a tubular section and an ejection section, where a combustion supporting gas and make-up gas are introduced into a gap between the nozzle and the base, forming a sealing portion through surface contact to prevent gas leakage and allowing the base to function as a heat sink, thereby stabilizing the nozzle's diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the nozzle is exposed to the hydrogen flame, then the hydrogen flame can be formed for detection, but the inner diameter of the nozzle expands causing gas flow rate fluctuation and reduced reproducibility
Solution Approach 1:
The nozzle is divided into two functional sections: a tubular section that is thermally isolated from the flame to maintain dimensional stability, and an ejection section that is exposed to the flame for ionization. This segmentation allows each section to fulfill its specific function without compromising the other.
Solution Approach 2:
A base structure with a passage acts as a thermal intermediary, guiding the sample gas through the nozzle while thermally isolating the tubular section from the hydrogen flame. The base conducts heat away from the nozzle, preventing thermal expansion of the inner diameter.
2Loss of energy
If the ejection section is in direct surface contact with the base, then the base can function as a heat sink, but the sealing portion must prevent gas leakage
Solution Approach 1:
The ejection section serves dual functions by being in direct surface contact with the base: it acts as both a sealing portion to prevent gas leakage and a heat transfer interface to dissipate heat from the flame-exposed section.
Solution Approach 2:
The base structure performs multiple functions simultaneously: it provides thermal isolation for the tubular section, acts as a heat sink for the ejection section, and forms a sealing portion to prevent gas leakage. This multi-functionality reduces the need for additional components.
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 design ensures high sealing performance and efficient heat transfer, maintaining consistent gas flow and detection sensitivity, even at high temperatures, thereby improving the reproducibility of analysis results.
Implementation Method 1
the base is configured to function as a heat sink for absorbing heat of the nozzle
Implementation Method 2
an outer peripheral surface of the ejection section being in direct surface contact with the base at an upper end portion of the passage
Implementation Method 3
a hydrogen flame is formed at the tip of a nozzle located at the exit of the separation column
Implementation Method 4
ions originating from the sample components, which are generated by the hydrogen flame
Data Source
AI summary
A hydrogen flame ionization detector includes a base having an opening and a passage, a nozzle having a tubular section and an ejection section, and a collector. The tubular section is housed within the passage of the base with a gap between an outer peripheral surface of the tubular section and an inner peripheral surface of the passage. The outer peripheral surface of the ejection section is in direct surface contact with the base at an upper end portion of the passage. The surface contact forms a sealing portion that prevents a gas from leaking upward along an outer side of the ejection section, and the base is configured to function as a heat sink for absorbing heat of the nozzle.