Gliding Arc Plasma Reactor for Low-Carbon Methane-to-Olefins Conversion
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Solution Overview
Problem
Existing technologies for converting methane to olefins using plasma have low conversion efficiency and are not environmentally friendly, as they often result in the generation of CO2 and pose ignition and explosion risks.
Innovation Solution
A gliding arc plasma reactor with symmetrically distributed arc surface electrodes forming a discharge area, allowing for intense gas flow through the discharge area, thereby improving reactant conversion efficiency and reducing energy consumption. The reactor enables one-step conversion of methane to olefins without generating CO2, making it safer and more environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional plasma methods are used to convert methane to olefins, then the conversion process can be achieved, but the conversion efficiency is low and energy consumption is high
Solution Approach 1:
The patent employs a gliding arc mechanism where the arc dynamically moves along the electrode surface rather than remaining stationary. This dynamic arc structure allows continuous renewal of the discharge zone, preventing local overheating and carbon deposition while maintaining high conversion efficiency. The arc's movement creates varying plasma conditions that enhance methane conversion while controlling energy consumption.
Solution Approach 2:
The patent utilizes nonequilibrium plasma conditions where electron temperature is much higher than gas temperature. By controlling the electron energy distribution and plasma parameters independently from bulk gas temperature, the process achieves high conversion efficiency without excessive thermal energy consumption. The electric field strength, gas flow rate, and pressure are optimized to maintain favorable nonequilibrium conditions.
2Productivity
If high-temperature plasma cracking is used to produce acetylene, then acetylene can be generated, but CO2 is produced which creates environmental issues and safety risks
Solution Approach 1:
The patent uses an inert or oxygen-deficient atmosphere during plasma cracking of methane. By controlling the gas composition to exclude or minimize oxygen, the process prevents complete oxidation of carbon to CO2. The inert environment allows selective formation of hydrocarbon products like acetylene and olefins while avoiding harmful CO2 generation, thus resolving the environmental and safety issues associated with traditional high-temperature plasma methods.
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 gliding arc plasma reactor achieves higher reactant conversion efficiency, maintains continuous and stable reactions, and avoids CO2 generation, reducing the risk of ignition and explosion, thus providing a safer and more environmentally friendly process for converting methane to olefins.
Implementation Method 1
a gliding arc plasma generator (300), and a lower reaction zone (4), wherein the gliding arc plasma generator is provided with at least two arc surface electrodes (3)... introducing a reaction gas containing methane into the gliding arc plasma reactor under plasma discharge conditions to carry out a methane conversion reaction
Implementation Method 2
the discharge surfaces of each arc surface electrode are all arc surface structures... the arrangement positions of the arc surface electrodes enable a discharge area to be formed between the arc surface electrodes
Data Source
AI summary
The present invention relates to the field of energy chemical industry, and disclosed are a gliding arc plasma reactor, and a method for converting methane by means of plasma. The reactor comprises a reactor chamber and a gliding arc plasma generator arranged in the reactor chamber, wherein the gliding arc plasma generator comprises at least two arc surface electrodes which are symmetrically distributed, such that a discharge area can be formed between the arc surface electrodes. According to the gliding arc plasma reactor provided in the present invention, the conversion rate of methane can be significantly improved when methane is converted into olefin; the selectivity of ethylene in the product is improved; and carbon deposition is significantly reduced. In addition, compared with a traditional process for preparing olefin from methane, no CO2 is generated; the ignition and explosion risk is avoided; and the reactor is safer and more environmentally friendly.