Plasma Reactor Arc Discharge Segmentation
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Solution Overview
Problem
Existing plasma reactors for gas conversion, such as DBD and NPD, suffer from limited conversion efficiency due to non-uniform plasma exposure and high heat transfer losses, leading to poor product yields, especially in applications requiring thermal dissociation.
Innovation Solution
A plasma reactor design featuring multiple pairs of high-voltage electrodes with synchronized pulsed arc discharges, a converging nozzle to accelerate gas flow, and a secondary gas injection system to enhance chemical conversion within a limited reaction volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DBD and NPD reactors are used for gas conversion, then plasma activated species are formed through electron-impact dissociation, but conversion efficiency is limited due to non-uniform plasma exposure and high heat transfer losses
Solution Approach 1:
The reactor divides the plasma generation into multiple independent arc discharge zones along the gas flow path. Each arc discharge heats and activates a specific segment of the gas flow, ensuring uniform exposure while reducing heat loss to any single location. The segmented approach allows better control of thermal energy distribution.
Solution Approach 2:
The reactor employs periodic pulsed arc discharges instead of continuous arcs. The pulsed operation allows the plasma channel to cool between pulses, reducing overall heat transfer losses to the reactor walls and electrodes while maintaining high conversion efficiency during the active discharge phases.
2Temperature
If DC and line-frequency AC arc reactors are used to generate high temperature plasma, then thermal dissociation is enhanced, but selectivity deteriorates due to large spreading in residence times and temperature gradients
Solution Approach 1:
The continuous arc is segmented into multiple discrete pulsed arc discharges distributed along the reactor. Each pulse creates a localized high-temperature zone with controlled residence time, reducing the spread in temperature and residence time distributions. This improves product selectivity while maintaining the benefits of thermal dissociation.
Solution Approach 2:
The reactor uses dynamically controlled pulsed discharges with adjustable pulse width, frequency, and amplitude. This dynamic control allows optimization of the temperature profile and residence time distribution, enabling better selectivity for desired products while maintaining high conversion efficiency.
3Temperature
If GAD reactors with moving arc discharge are used, then intermediate temperatures are achieved, but reaction volume increases causing poor product yields as gas flows at too far distance from arc filaments
Solution Approach 1:
Instead of allowing the arc to move downstream as in GAD reactors, the invention fixes multiple arc discharge zones along the flow path and allows the gas to pass through them sequentially. This inversion ensures that all gas portions are exposed to plasma activation zones, eliminating the problem of gas flowing too far from arc filaments and improving product yields.
Solution Approach 2:
The single moving arc is replaced by multiple stationary arc discharge zones distributed along the reactor length. This segmentation ensures that the entire gas flow passes through active plasma zones, maximizing conversion efficiency and product yield while maintaining intermediate temperature 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
The reactor achieves more stable and uniform plasma exposure, resulting in improved chemical conversion yields and reduced energy costs, with sub-millisecond residence times and controlled temperature profiles.
Implementation Method 1
repetitively and simultaneously power electrode pairs with a voltage and rate generating arc discharges
Implementation Method 2
chemical conversion mainly depends on thermal dissociation
Implementation Method 3
converging nozzle to accelerate gas flow
Implementation Method 4
passage that is provided within an interior volume of a reactor housing. The passage has a throat area
Implementation Method 5
first inlet for injecting a flow of a primary fluid flow along a surface of the electrode rod
Implementation Method 6
electron-impact dissociation forming plasma activated species such as radicals, ions and energy excited atoms and molecules
Implementation Method 7
chemical conversion yields of the plasma chemical conversion process
Data Source
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AI summary
The present disclosure provides a plasma reactor (100) for plasma induced chemical conversion of one or more compounds in a fluid medium. The reactor comprising a passage (1); an outlet (3); and at least two electrode pairs. Each electrode (10) comprises a jacket (11), an electrode rod (12), and an inlet (4) for injecting a primary gas (G1) flow along the rod. The rods are distributed around the passage. Rod tips are positioned upstream the throat of the passage. A second inlet (5) injects a secondary gas (G2) upstream or downstream the throat area (2). An operating circuit is driven to repetitively and simultaneously power the electrode pairs to generate an arc discharge (A) bridging the electrodes of each electrode pair. Neighboring electrodes of adjacent pairs are driven at the same time-varying potential. The electrodes are galvanically isolated each other and the power source.