Pulsed Plasma Gas Conversion With Flow-Controlled Reverse Reaction Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing plasma-chemical conversion processes suffer from low energy efficiency due to irreversible energy losses and reverse reactions, with known technologies like DBD and pulsed corona discharges having conversion efficiencies of only 10%-20%, and heated reaction chambers exacerbating the issue by heating both reagents and products.
Innovation Solution
A method involving a pulsed electrical discharge in a moving gas flow within a reaction chamber, creating short-lived plasma channels that quickly extinguish, with optimal parameters of 250 J/(m3*A2) < ρ*V2/I2 < 4,000 J/(m3*A2), to minimize reverse reactions and maximize forward reactions by supplying new reagents and removing products swiftly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If nonequilibrium plasma is used to dissociate molecules through electron collisions, then radicals and active particles are produced, but energy efficiency is very low (10%-20%) due to irreversible energy losses
Solution Approach 1:
The patent applies periodic pulsed electrical discharge instead of continuous plasma generation. The discharge operates in cycles with specific duration (10-500 ns) and frequency (20-300 kHz), creating repeated plasma channels that process gas portions sequentially. This periodic action allows the system to achieve high conversion efficiency (up to 80-90%) by repeatedly exposing fresh reagent portions to plasma conditions while minimizing cumulative energy losses.
Solution Approach 2:
The continuous gas flow is divided into discrete portions, each processed by individual plasma channels formed during different discharge pulses. The gas flow velocity and plasma channel formation create segmented processing zones where different portions of gas experience plasma treatment at different times. This segmentation prevents energy losses from accumulating and allows optimized energy input for each processed portion.
2Productivity
If the reaction chamber is heated to break through activation barriers, then forward reactions are stimulated, but reverse reactions increase and energy efficiency decreases
Solution Approach 1:
The periodic pulsed discharge creates temporary high-temperature plasma channels that last only 10-500 ns per pulse. This brief, repeated heating stimulates forward reactions effectively while allowing the bulk gas to remain at lower temperatures between pulses, minimizing energy spent on heating and dissociating final products.
Solution Approach 2:
The system dynamically controls the plasma channel lifetime through pulsed electrical discharge with adjustable parameters (duration 10-500 ns, frequency 20-300 kHz). This dynamic control allows the plasma to exist long enough to stimulate forward reactions but short enough to prevent excessive heating of products that would promote reverse reactions.
3Quantity of substance
If plasma channel duration is extended to maximize dissociation, then more radicals are produced, but reverse reactions increase and conversion efficiency decreases
Solution Approach 1:
The plasma channel lifetime is dynamically optimized to 10-500 ns per pulse, which is sufficient to produce the necessary radicals and active particles for high conversion efficiency (up to 80-90%). This dynamic parameter control prevents excessive plasma duration that would lead to reverse reactions while maintaining enough duration for effective dissociation.
Solution Approach 2:
Instead of maintaining continuous plasma, the system uses periodic pulses with optimized duration. Each pulse creates a plasma channel lasting 10-500 ns, producing radicals efficiently without allowing them to persist long enough to cause significant reverse reactions. The periodic repetition ensures continuous radical production for high overall conversion.
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 significantly increases the efficiency of gas conversion by stimulating forward reactions and minimizing reverse reactions, achieving optimal plasma-chemical conversion and energy efficiency by controlling the duration and frequency of plasma channels.
Implementation Method 1
Plasma can be regarded as a very powerful tool for facilitating chemical reactions with a high activation energy
Implementation Method 2
A method is proposed for plasma-chemical conversion of a gas or gas mixture by creating a pulsed electrical discharge in a flow of the gas or gas mixture
Implementation Method 3
One of the ways is by disassociating the source molecules by means of colliding them directly with electrons that have sufficient energy
Implementation Method 4
creating a pulsed electrical discharge in a flow of the gas or gas mixture moving in the reaction chamber at a given velocity
Data Source
AI summary
A method and a device are proposed for plasma-chemical conversion of gas or gas mixture using a pulsed electrical discharge. They allow increasing efficiency of the process for converting gas/gas mixture into desired products by stimulating forward reactions and minimizing reverse reactions. This is achieved by converting the gas/gas mixture using a pulsed electrical discharge in the form of hot plasma channels formed between electrodes in the moving flow of gas/gas mixture, wherein the ratio of the flow velocity to the average discharge current falls within the following range: 250 J/(m3*A2)<ρ*V2/I2<4,000 J/(m3*A2), where ρ is the density of gas/gas mixture in a reaction chamber (kg/m3), V is the flow velocity of gas/gas mixture in the reaction chamber (m/s), and I is the average current of the pulsed electrical discharge (A).