Needle-Based Double Helix Electrode for DBD Gas Treatment
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Solution Overview
Problem
Existing DBD reactors have inefficiencies in treating gases due to limited contact area between target gas and high-energy ions, leading to non-uniform discharging and reduced treatment effectiveness, especially in areas between needle sets and at the bottom of the reactor.
Innovation Solution
A needle-based synergistic double helix electrode dielectric barrier discharging tube design featuring a quartz tube with a high voltage electrode, an inner electrode with a drive fan, and a discharging needle set with a spiral discharging wire, which increases the contact area and discharging uniformity by creating a cyclone effect, allowing gas to flow towards the discharging area and improving treatment efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a needle-tip typed reactor is used with static tip discharging, then the discharging voltage is reduced and intensity of high-energy particles is increased, but only the gas near the tip can be better ionized while creating blank areas between needle sets and at the bottom
Solution Approach 1:
The patent transforms the static needle tip discharging into dynamic discharging by introducing a rotating inner electrode with needle sets. The rotation enables the needles to dynamically access different spatial positions, eliminating blank areas and ensuring uniform treatment throughout the entire gas flow path, including regions between needle sets and at the bottom of the reactor.
Solution Approach 2:
The patent adds the temporal dimension to the discharging process through rotation, transforming a two-dimensional static needle arrangement into a three-dimensional dynamic discharging system. This enables the needles to cover the entire spatial volume over time, eliminating blind spots in the treatment area.
2Area of stationary object
If multiple discharging needles are arranged on the inner electrode surface, then the discharging area is increased, but the contact area between target gas and high-energy ions remains limited and discharging uniformity is poor
Solution Approach 1:
By rotating the inner electrode with multiple needle sets, the system dynamically distributes the discharging action throughout the entire gas flow path. This ensures uniform contact between target gas and high-energy ions across all spatial regions, eliminating poor discharging uniformity while maintaining increased discharging area.
3Productivity
If the inner electrode is made to rotate driven by gas flow, then dynamic stereo discharging is achieved and treatment area is increased, but the device complexity increases
Solution Approach 1:
The system uses the kinetic energy of the gas flow itself to drive the rotation of the inner electrode through the drive fan. This self-driven mechanism eliminates the need for external motors or complex drive systems, achieving dynamic stereo discharging and increased treatment area while minimizing the addition of complex components.
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 design enhances gas treatment by increasing the contact area with high-energy ions, improving discharging uniformity, and adapting to different gas concentrations and flow rates, resulting in a more effective and efficient plasma treatment process.
Implementation Method 1
When the flow rate of the target gas increases, the drive fan is impacted by the airflow and rotates to drive the inner electrode to rotate
Implementation Method 2
the spiral discharging wire may generate a cyclone when rotating, allowing the gas to flow towards the tips of the discharging needle set and the area where the spiral discharging wire is located
Implementation Method 3
A principle of the plasma technology treating pollutants is as follows. When an external electric field is applied, media discharge to generate a large number of energy-carrying electrons
Implementation Method 4
the generated electrons bombard molecules of the pollutants, such that the bombarded molecules are ionized, dissociated, and excited
Data Source
AI summary
A dielectric barrier discharge tube includes a quartz tube, the middle of the quartz tube is sleeved with a high-voltage electrode, an inner electrode is arranged in the quartz tube, a drive fan is arranged at the end of the inner electrode, a discharging needle set is arranged on the surface of the inner electrode, and a spiral discharging wire is suspended and arranged at the tip of the discharging needle set. After a high voltage electric field is applied to the high voltage electrode, the discharging needle set and the spiral discharging wire discharge, the discharging needle set and the spiral discharging wire discharge at different time points. When the gas passes through the driving fan, the flow direction of the gas is changed. A cyclone can be generated to drive the gas to flow towards the discharging area.