Angled Restrictor Flame Ionization Detector Burner
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Solution Overview
Problem
Conventional FID burner assemblies require precise positioning and re-positioning of the restrictor to optimize analyte response and maintain flame stability, especially when dealing with varying mobile phase flow rates in compressible fluid-based chromatography systems, which can be impractical and limit the operational flexibility.
Innovation Solution
The FID burner assemblies are designed with a restrictor that delivers the decompressed mobile phase flow stream at an angle substantially non-parallel to the burner's longitudinal axis, eliminating the need for precise positioning and ensuring stable flame operation and optimal analyte response regardless of the restrictor's position within the burner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional square cut restrictor is used to deliver mobile phase flow parallel to the burner axis, then the restrictor design is simple and easy to manufacture, but precise positioning of the restrictor is required to maintain flame stability and achieve optimal analyte response
Solution Approach 1:
The restrictor is designed with an asymmetric angled cut at its distal end, creating a non-symmetric flow exit geometry. This asymmetric design causes the mobile phase to exit at an angle substantially non-parallel to the burner axis, which fundamentally changes the flow dynamics and eliminates the need for precise restrictor positioning while maintaining flame stability and optimal analyte response.
2Productivity
If the restrictor flow rate is increased to handle higher mobile phase flow rates, then the system can accommodate higher flow rates, but the flame stability deteriorates and analyte response optimization becomes more difficult
Solution Approach 1:
The invention introduces an angular dimension to the restrictor exit geometry, directing the mobile phase flow at an angle substantially non-parallel to the burner axis. This dimensional change in flow direction allows the system to accommodate higher mobile phase flow rates while maintaining flame stability, as the angled entry distributes the flow more effectively into the burner and prevents direct impingement on the flame.
3Measurement precision
If the restrictor position is re-optimized for different flow rates, then optimal analyte response can be achieved for each condition, but the operational complexity and time required for optimization increases
Solution Approach 1:
The angled restrictor design creates a self-adjusting flow distribution pattern that automatically adapts to different mobile phase flow rates. The angled geometry ensures that regardless of the flow rate, the mobile phase enters the burner at an optimal angle, eliminating the need for manual re-positioning or re-optimization of the restrictor for different operating conditions.
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 configuration provides enhanced flame stability and optimal analyte response without the need for precise restrictor positioning, maintaining performance across a range of flow rates and system pressures, thus improving the operational flexibility and reliability of the chromatography system.
Implementation Method 1
the mobile phase, typically compressed carbon dioxide, is used... When decompressed, the CFC mobile phase achieves much higher flow rates... the compressed mobile phase enters the restrictor as a dense fluid and exits as a decompressed gas
Implementation Method 2
Flame ionization detection (FID) was originally developed for use in conjunction with gas chromatography... During flame-based detection of one or more constituents of the at least a portion of the mobile phase flow stream
Data Source
AI summary
Burner assemblies of flame-based detectors are configured to deliver decompressed mobile phase of supercritical fluid chromatography systems to the flame of a flame-based detector while providing for improved optimization of analyte response as well as enhanced flame stability during operation.