ICP Aerosol Flow Control Using Counter-Flow Vortex Separation
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Solution Overview
Problem
Current ICP-MS and ICP-OES systems face inefficiencies in droplet separation and transport, leading to unstable plasma, blockages, and compromised analytical performance due to varying sample matrix complexity and sensitivity requirements, with existing spray chambers providing limited control over droplet size and transport efficiency.
Innovation Solution
A flow control device with a vortex-generating mechanism that uses a gas injection duct to create a counter-flow vortex, retarding larger droplets and promoting smaller droplet formation, integrated between the nebulizer and plasma to enhance droplet separation and transport efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a spray chamber is used to separate larger droplets, then droplet size control is improved, but transport efficiency deteriorates (less than 5% of sample aerosol is transported to plasma)
Solution Approach 1:
The patent employs a dynamic flow control mechanism where gas flows through adjustable orifices to create variable backpressure within the spray chamber. This dynamic pressure control allows optimization of both droplet separation and transport efficiency by adjusting the balance between droplet removal and aerosol transmission without compromising either function
Solution Approach 2:
The invention changes the pressure parameter within the spray chamber by introducing controllable backpressure through adjustable orifices. By modifying the pressure differential across the spray chamber, the system optimizes both droplet size rejection and aerosol transport efficiency, resolving the contradiction between these two parameters
2Adaptability or versatility
If multiple spray chamber designs are used to address sample matrix complexity, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal spray chamber design that can handle multiple sample matrices by incorporating adjustable flow control orifices. This single device design provides multi-functionality by allowing optimization for different sample types through parameter adjustment rather than requiring multiple specialized chambers, thus improving adaptability while reducing device complexity
3Reliability
If interface cones with small orifices are used to support vacuum, then vacuum stability is improved, but blockage risk increases with high total dissolved solids
Solution Approach 1:
The patent implements preliminary droplet separation and size control within the spray chamber before the aerosol reaches the interface cones. By pre-processing the aerosol to remove or reduce droplet size variations, the system prevents blockages at the vulnerable interface cone orifices while maintaining vacuum stability, thus eliminating the harmful effect before it occurs
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 device improves droplet size control, reducing larger droplet passage and enhancing the homogeneity of the aerosolized sample, thereby stabilizing the plasma and improving analytical performance by increasing the proportion of smaller droplets and reducing blockages in the system.
Implementation Method 1
the injection duct configured to direct a stream of gas in an injection direction to the sample flow separating region, the injection direction angled relative to the longitudinal flow direction such that, upon introduction of the stream of gas through the opening, a vortex flow is generated in the sample flow separating region
Implementation Method 2
a vortex flow is generated in the sample flow separating region, the vortex flow having a direction counter to the direction of flow of the aerosolised sample to provide control of droplet size in the modified aerosolised sample
Data Source
AI summary
A flow control device for aerosolised sample delivery in an inductively coupled plasma (ICP) analytical system is provided. The device includes a body that at least in part defines a sample flow separating region, the sample flow separating region having a longitudinal flow direction and having an upstream end through which the aerosolised sample enters and a downstream end through which a modified aerosolised sample exits. The body further includes an injection duct having an opening adjacent to the sample flow separating region, the injection duct configured to direct a stream of gas in an injection direction to the sample flow separating region. The injection direction is angled relative to the longitudinal flow direction such that, upon introduction of the stream of gas through the opening, a vortex flow is generated in the sample flow separating region, the vortex flow having a direction counter to the direction of flow of the aerosolised sample to provide control of droplet size in the modified aerosolised sample.