Microparticle Production via Modulated Induction Plasma
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Solution Overview
Problem
Existing fine particle production methods using thermal plasma processes struggle to achieve uniform particle sizes with narrow particle size frequency distributions, leading to variations in particle size.
Innovation Solution
A method involving the intermittent supply of feedstock into a modulated induction thermal plasma flame, which is periodically switched between high and low temperature states, along with spectroscopic analysis to control the supply timing, to produce fine particles with improved size uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feedstock is continuously supplied into thermal plasma flame, then productivity is improved, but particle size uniformity deteriorates
Solution Approach 1:
The patent applies periodic action by intermittently supplying feedstock into the thermal plasma flame in cycles, alternating between supply and non-supply periods. This periodic supply mechanism prevents continuous accumulation of particles, thereby suppressing bonding growth and maintaining narrow particle size distribution while achieving high productivity through sustained production cycles.
2Manufacturing precision
If feedstock is intermittently supplied into thermal plasma flame, then particle size uniformity is improved, but productivity deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the periodic supply cycle parameters, where the supply period and non-supply period are carefully controlled. The intermittent supply maintains narrow particle size distribution while the high temperature state duration and repetition frequency ensure sufficient production rate, achieving both uniformity and productivity.
Solution Approach 2:
The patent employs parameter changes by adjusting the plasma flame temperature, supply cycle frequency, and feedstock amount per cycle. These parameter optimizations enable the system to maintain particle uniformity during intermittent supply while compensating for reduced continuous input through increased per-cycle efficiency and temperature control.
3Length of moving object
If coil current amplitude is modulated to rapidly cool vapor, then finer particles are obtained, but particle size control precision deteriorates
Solution Approach 1:
The patent applies periodic action through modulating the coil current amplitude in synchronized cycles with feedstock supply. The plasma flame temperature is periodically adjusted to match the supply cycles, creating controlled thermal environments that enable rapid cooling during non-supply periods while maintaining stability during supply periods, thus achieving both fine particle size and narrow distribution.
Solution Approach 2:
The patent employs feedback mechanisms where the coil current modulation is controlled based on monitoring of particle formation conditions. The system adjusts plasma power in response to particle size development, ensuring that cooling rate and particle growth are coordinated to produce uniform fine particles with precise size control.
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 effectively produces fine particles with a narrower particle size frequency distribution, enhancing the uniformity and quality of the particles produced.
Implementation Method 1
evaporate the feedstock and convert the feedstock to a mixture in a gas phase
Implementation Method 2
a thermal plasma process is a process for producing fine particles by instantly evaporating feedstock in a thermal plasma flame
Implementation Method 3
generating, as the thermal plasma flame, a modulated induction thermal plasma flame
Implementation Method 4
then cooling the mixture
Implementation Method 5
rapidly cooling and solidifying the resulting evaporated product
Data Source
AI summary
Provided are a method and apparatus capable of producing fine particles with favorable particle size distribution. In a production method in which feedstock for fine particle production is supplied intermittently into a modulated induction thermal plasma flame, the feedstock is vaporized to form a gas phase mixture, and the mixture is cooled to produce the fine particles: a modulated induction thermal plasma flame in which the temperature state is time-modulated is generated; the modulated induction thermal plasma flame is switched between a high temperature state and a low temperature state; and when the modulated induction thermal plasma flame is in the high temperature state, the feedstock is supplied together with a carrier gas, and when the modulated induction thermal plasma flame is in the low temperature state, supply of the feedstock is suspended and a gas of the same type as the carrier gas is supplied.