Nitrogen-Enriched Water Generator Plasma Electrode Life
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Solution Overview
Problem
Existing devices for generating nitrogen-enriched water using plasma technology face issues such as rapid electrode burnout, inefficient NOx gas exposure to water, and lack of recycling and monitoring capabilities, leading to reduced efficiency and effectiveness in plant fertilization.
Innovation Solution
The use of concentric ringed stainless steel electrodes with air injection and cooling, a chamber design with water spray nozzles and deflection rings for increased surface area exposure, a system for recirculating unabsorbed NOx gas, and a monitoring and control system for efficient operation and storage of nitrogen-enriched water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plasma electrodes are used to generate NOx gas, then nitrogen fixation efficiency is improved, but electrode life deteriorates due to rapid burnout from plasma strikes
Solution Approach 1:
The electrode is divided into multiple concentric rings instead of a single continuous structure. This segmentation increases the total surface area available for plasma generation while distributing the plasma strike locations across multiple separate rings, reducing the concentration of thermal damage at any single point and thereby extending electrode life while maintaining nitrogen fixation efficiency.
Solution Approach 2:
The electrode design transitions from a simple linear or planar structure to a three-dimensional concentric ring configuration. This dimensional change increases the surface area in the radial direction while distributing plasma generation across multiple circular paths, allowing more uniform heat distribution and reduced localized burnout.
2Device complexity
If NOx gas is vented to the atmosphere after water exposure, then system simplicity is maintained, but NOx absorption efficiency deteriorates due to loss of unabsorbed gas
Solution Approach 1:
Instead of venting unabsorbed NOx gas to the atmosphere, the system recirculates it back through the water exposure chamber. This recovery process allows the NOx gas that did not absorb during the first pass to be exposed to water again, increasing the overall absorption efficiency and reducing waste of the nitrogen fixation process.
Solution Approach 2:
The NOx gas continues to be exposed to water in a continuous recirculation loop rather than being discharged after a single pass. This continuous action ensures that the gas undergoes multiple absorption opportunities, maximizing the utilization of the generated NOx and improving overall system productivity.
3Device complexity
If NOx gas is bubbled through water for exposure, then equipment simplicity is maintained, but absorption efficiency deteriorates due to limited surface area contact
Solution Approach 1:
The system uses pressurized spray nozzles to convert water into a fine mist or spray pattern as it enters the chamber containing NOx gas. This pneumatic-hydraulic approach increases the surface area of water exposed to the gas significantly compared to bubbling, enhancing mass transfer and absorption efficiency while maintaining relatively simple equipment.
Solution Approach 2:
The water delivery system transitions from a single-phase bubbled flow to a dispersed spray pattern that occupies three-dimensional space within the chamber. This dimensional change creates numerous small droplets with high total surface area, dramatically improving the gas-liquid contact area and absorption efficiency.
4Duration of action of stationary object
If electrodes are cooled by water placement in plasma path, then electrode life is improved, but water contamination in plasma chamber occurs
Solution Approach 1:
The cooling function is separated from the plasma generation function by using dedicated cooling channels or jackets around the electrodes rather than placing water directly in the plasma path. This segmentation allows the electrode to be cooled effectively while preventing water contamination of the plasma chamber environment.
Solution Approach 2:
A thermal intermediary structure such as a cooling jacket or heat sink is introduced between the electrode and the water coolant. This intermediary allows heat transfer from the electrode to the water without direct contact between water and the plasma generation zone, thus cooling the electrode while preventing contamination.
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 solution extends electrode life, increases NOx absorption into water, enhances efficiency by recycling NOx gas, and provides real-time monitoring and storage capabilities, resulting in improved nitrogen-enriched water generation for plant fertilization.
Implementation Method 1
a plasma generator including a first cylindrical outer electrode and a second cylindrical inner electrode spaced apart therefrom such that the first cylindrical outer electrode and the second cylindrical inner electrode define an air gap therebetween... generate a plasma in the gap therebetween. The plasma causes the NOx gas to be generated
Implementation Method 2
inject air into the gap between the first cylindrical outer electrode and the second cylindrical inner electrode... move the plasma arcs so that the plasma arcs will not strike the same location on the electrodes thereby burning out the electrodes
Implementation Method 3
create a chamber that increases the surface area of the water to be exposed to the NOx by use of pressure controlled spray nozzles into the chamber
Implementation Method 4
place the plasma electrodes directly in the path of the water to create a water cooling effect of the electrodes
Implementation Method 5
capture and recirculate the NOx gas back to be exposed to water. This increases the concentration of NOx gas and therefore increases the absorption of the NOx into the water
Data Source
AI summary
A nitrogen-enriched water generator includes an elongated housing defining a sealed nitrogen/oxygen chamber in which nitrogen molecules are combined with oxygen molecules to form a nitrate (NO3) or a nitrite (NO2) gas (NOx gas). The housing includes an NOx gas and water mixing tube, a plasma generator and a nitrogen-enriched water trap. A water spray nozzle sprays water into the chamber. At least one air injection port injects air into the chamber. A vacuum port removes a volume of NOx gas not absorbed by the water from the sealed nitrogen/oxygen chamber.