Capacitive Phase Separator With Dual Probes for High-Pressure Microflows
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Solution Overview
Problem
Current systems fail to effectively separate gases, hydrocarbons, and water in micro-scale laboratory equipment due to size limitations, precision issues, and inability to operate at high pressures, with existing capacitive sensors only capable of separating one liquid phase from a gaseous phase with limited precision.
Innovation Solution
A three-phase capacitive separator device with two electrically isolated probes and RC oscillator circuits that measure capacitance differences to separate gases, hydrocarbons, and water, allowing for controlled outflow and operation at high pressures up to 400 bar, using a tank made of conducting material with a volume between 3 and 20 cm3, and incorporating a refrigeration system for condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single capacitive probe is used to separate two phases, then the device structure is simple, but the separation precision and measurement accuracy are limited to 100 μm
Solution Approach 1:
The single probe is segmented into two electrically isolated probes, each capable of measuring different phases independently. This segmentation allows for simultaneous measurement of water level and hydrocarbon level with higher precision, while maintaining a relatively simple overall device structure.
Solution Approach 2:
The capacitive sensor system is designed to perform multiple functions: separating gases from liquids, separating immiscible liquids (water and hydrocarbons), and providing precise level measurement for each phase. This multi-functionality is achieved through the two-probe configuration that can detect different dielectric materials simultaneously.
2Reliability
If conventional separation systems are used, then they can separate hydrocarbons and water, but they have large system dead volumes and cannot operate at high pressures
Solution Approach 1:
The system operates by changing the dielectric parameter (capacitance) to detect and separate different phases. The capacitive sensors measure changes in dielectric constant to identify water, hydrocarbons, and gases, enabling high-pressure operation without mechanical moving parts that would limit pressure capability.
Solution Approach 2:
Mechanical separation systems are replaced with a capacitive sensing system that uses electrical field interactions to detect and separate phases. This substitution eliminates the need for large mechanical separators, allowing the system to operate at high pressures with minimal dead volume.
3Measurement precision
If gravitational or centrifugal principles are used for separation, then the separation mechanism is simple, but the system cannot achieve precise separation in micro-scale systems
Solution Approach 1:
Gravitational and centrifugal mechanical separation mechanisms are replaced with an electrical field-based capacitive sensing system. The system uses differences in dielectric properties to detect and separate phases with high precision in micro-scale volumes, eliminating the need for large-scale mechanical forces.
Solution Approach 2:
The system exploits changes in dielectric parameters to achieve separation. By measuring capacitance variations caused by different materials (water, hydrocarbons, gases), the system achieves precise separation in micro-scale configurations where gravitational and centrifugal forces are insufficient.
4Volume of stationary object
If the tank volume is reduced to 3-20 cm3 for micro-scale applications, then the system dead volume is reduced, but the ability to maintain hermetic sealing at high pressures becomes difficult
Solution Approach 1:
The patent employs flexible sealing elements and thin-film diaphragms that can maintain hermetic sealing in small-volume tanks under high pressure. These flexible components deform elastically to accommodate pressure variations while maintaining seal integrity, enabling reliable operation in the 3-20 cm3 volume range at pressures up to 400 bar.
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 achieves precise separation of gases, hydrocarbons, and water with reduced system dead volumes, enabling efficient operation at high pressures and improving measurement accuracy in micro-scale laboratory settings.
Implementation Method 1
the device is equipped with two RC oscillator circuits that measure the variation in the electric capacity of the electric condensers formed by the measurement probes and the tank walls
Implementation Method 2
the fluids contained in the tank act as a dielectric
Implementation Method 3
incorporating a refrigeration system for condensation
Data Source
AI summary
A device is disclosed which is designed to separate water, hydrocarbons and gases, based on the electric characteristics of the materials; the device utilizes the different capacitance of water and hydrocarbons.