Plasma Electro-Coalescence Reactor for Oil-Water Separation
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Solution Overview
Problem
Conventional oil separation methods face challenges in efficiently separating oil from emulsified mixtures containing impurities like water and dirt, as they often require lower voltages to avoid arcing and flashover, limiting coalescence efficiency and increasing costs due to the need for larger equipment.
Innovation Solution
A plasma electro-coalescence reactor uses a non-oxidizing gas to allow for higher voltages without arcing, employing electrodes to generate plasma that chemically alters the mixture, enhancing oil and water separation by ionizing gases and creating surfactant properties, while controlling the electric field to prevent undesirable discharges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher voltages are applied to increase coalescence efficiency, then separation efficiency improves, but arcing and flashover occur limiting the voltage that can be applied
Solution Approach 1:
The patent applies an inert gas atmosphere (nitrogen or carbon dioxide) within the separation chamber to replace oxygen-containing air. This inert environment prevents combustion and flashover that would normally occur at high voltages, allowing the system to operate at voltages significantly higher than conventional systems without safety concerns. The inert gas acts as a protective medium that enables high-voltage operation while eliminating the harmful flashover effect.
2Reliability
If lower voltages are used to avoid arcing, then safety is maintained, but coalescence efficiency decreases and equipment size must increase
Solution Approach 1:
By creating an inert atmosphere throughout the separation chamber, the system maintains safety at high voltages rather than being forced to use lower voltages. The inert gas environment fundamentally changes the safety profile, allowing high-voltage operation without increased risk of flashover or combustion, thereby simultaneously achieving both high reliability and high productivity.
Solution Approach 2:
The patent changes the fundamental parameter of the gas composition from oxygen-containing air to inert gas (nitrogen or carbon dioxide). This parameter change allows the system to operate in a completely different voltage regime, where high voltages no longer pose safety risks, thus enabling high coalescence efficiency without compromising safety.
3Productivity
If conventional electrostatic coalescence is used, then equipment size must be large to achieve sufficient separation, but this increases cost and footprint
Solution Approach 1:
The inert atmosphere enables the use of much higher voltages than conventional systems, which dramatically increases the coalescence rate and efficiency. This allows the same separation throughput to be achieved in a much smaller equipment volume, or alternatively, provides excess throughput capability in a compact design, thereby resolving the contradiction between productivity and equipment size.
Solution Approach 2:
By changing the operating voltage parameter to significantly higher levels (made possible by the inert atmosphere), the system achieves much faster coalescence rates. This parameter change allows compact equipment design while maintaining high productivity, as the enhanced electric field strength accelerates the separation process within a smaller volume.
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 method achieves higher coalescence efficiency per unit volume processed, reducing the need for larger equipment and costs, and produces plasma-enhanced water with surfactant properties that aids in oil-water separation, improving the efficiency and effectiveness of oil recovery and remediation processes.
Implementation Method 1
employing electrodes to generate plasma that chemically alters the mixture
Implementation Method 2
ionizing gases
Implementation Method 3
electrostatic coalescence phase separation and demulsification
Data Source
AI summary
Provided are systems and methods involving a plasma electro-coalescence reactor. The reactor includes a set of ports configured to receive an emulsified mixture into the reactor, receive a non-oxidative gas into the reactor, expel oil from the reactor, and expel water from the reactor. The reactor includes a set of electrodes including a first electrode in a headspace of the reactor, and a second electrode, the set of electrodes configured to receive a voltage at or in excess of a breakdown voltage of the non-oxidative gas.