Nitrogen Oxide Plasma Process via Magnetic Arc Control
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Solution Overview
Problem
The existing electric arc processes for producing NO gas face challenges in achieving high yields and energy efficiency due to high temperature and pressure requirements, which are difficult to manage with existing materials and result in significant energy consumption and low NO yields.
Innovation Solution
The process employs a magnetic field to shape and control an electric arc through air or oxygen-enriched air, using AC or DC currents, operating at pressures below atmospheric pressure, and incorporates a heat exchanger for quenching and cooling, allowing for a stable NO-containing plasma at lower temperatures and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high temperature (3000-4000 K) is used to dissociate nitrogen in the electric arc process, then nitrogen dissociation is achieved, but energy consumption increases significantly and NO yield remains low (1-2%)
Solution Approach 1:
The patent changes the pressure parameter from atmospheric to sub-atmospheric (0.1-1 bar), which fundamentally alters the plasma chemistry and energy requirements. At lower pressures, nitrogen dissociation occurs more efficiently at lower temperatures, and the formed NO is less prone to decomposition, resolving the contradiction between temperature and energy consumption
Solution Approach 2:
The patent employs periodic pulsing of the electric arc discharge, creating cyclic plasma formation and collapse. This periodic action allows for efficient energy coupling, where each pulse creates a transient high-temperature plasma that dissociates nitrogen, followed by a cooling phase where NO forms and stabilizes, improving overall energy efficiency and NO yield
2Productivity
If high pressure is applied to increase NO yield, then nitrogen fixation efficiency improves, but material limitations are exceeded and process complexity increases
Solution Approach 1:
Instead of increasing pressure to improve NO yield as in conventional processes, the patent inverts the approach by operating at sub-atmospheric pressures. The lower pressure environment enhances nitrogen dissociation efficiency and reduces NO decomposition, achieving high yields without requiring complex high-pressure equipment or materials
3Ease of operation
If atmospheric pressure is used in the electric arc process, then operation is simplified, but NO decomposition increases and yield remains low
Solution Approach 1:
The patent changes the pressure parameter from atmospheric to sub-atmospheric (0.1-1 bar), which fundamentally alters the plasma chemistry and energy requirements. At lower pressures, nitrogen dissociation occurs more efficiently at lower temperatures, and the formed NO is less prone to decomposition, resolving the contradiction between temperature and energy consumption
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
This approach achieves an NO yield of up to 12% with an energy consumption of 30GJ/tonne N or lower, significantly improving energy efficiency and overcoming material limitations by optimizing plasma conditions and retention time.
Implementation Method 1
by means of moving an electric arc through the air flow by using a magnetic field and AC or DC currents
Implementation Method 2
moving an electric arc through the air flow by using a magnetic field
Implementation Method 3
The temperature in the exited arc is adjusted to be within the range of 3000 to 5000 Kelvin... a stable NO-containing plasma having a temperature below 2000 Kelvin
Implementation Method 4
incorporates a heat exchanger for quenching and cooling, allowing for a stable NO-containing plasma at lower temperatures
Implementation Method 5
the air flow is quenched by applying a spray of fine water droplets upstream or just downstream the arc
Data Source
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AI summary
A process for producing NO gas from a feed flow of air or oxygen enriched air, by means of moving an electric arc through the air flow by using a magnetic field and AC or DC currents, in a reactor, wherein a pressure lower than 1 bar is applied, wherein the temperature in the exited arc is adjusted to be within the range of 3000 to 5000 Kelvin, and wherein the air flow is quenched by applying a spray of fine water droplets upstream or just downstream the arc, excess air feed or bypassed air to obtain a stable NO-containing plasma having a temperature below 2000 Kelvin.