Surfaguide Waveguide for Hydrocarbon Plasma Processing
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Solution Overview
Problem
Current methods for coal liquefaction and hydrocarbon upgrading face challenges in scaling up microwave plasma processes due to energy loss and poor energy penetration, leading to inefficiencies and high costs in commercial production.
Innovation Solution
The system employs a waveguide and reaction tube structure with a dielectric outer wall, using microwaves to propagate surface waves and form plasma within the reaction tube, allowing for efficient processing of hydrocarbon feedstocks into fuel-grade products with reduced energy requirements and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If microwave plasma processing is used for coal liquefaction and hydrocarbon upgrading, then reaction efficiency and product quality are improved, but energy loss increases and scaling up becomes difficult
Solution Approach 1:
The reaction chamber is divided into multiple zones with different microwave field intensities and plasma conditions. The segmented approach allows optimized processing in each zone while reducing overall energy requirements through localized plasma generation.
Solution Approach 2:
Different regions of the reaction chamber are provided with tailored microwave power density and plasma conditions matched to specific processing requirements. This local optimization improves reaction efficiency in critical zones while minimizing energy waste in other areas.
2Object-affected harmful factors
If conventional direct coal liquefaction is used, then CO2 emissions are reduced, but higher temperatures and pressures are required
Solution Approach 1:
The process utilizes plasma phase transitions and electromagnetic field interactions to achieve coal liquefaction at lower temperatures. The plasma state enables direct conversion of solid coal to liquid hydrocarbons without requiring conventional high-temperature thermal processes.
Solution Approach 2:
Conventional thermal-mechanical liquefaction methods are replaced with electromagnetic field-based plasma processing. The microwave plasma system substitutes high-temperature thermal energy with directed electromagnetic energy, enabling lower operating temperatures and pressures.
3Productivity
If reaction chamber size is increased for commercial production, then production capacity is improved, but microwave energy penetration and coupling efficiency deteriorate
Solution Approach 1:
Large-scale commercial reactors are designed with segmented microwave injection systems and divided processing zones. Multiple microwave sources are distributed throughout the reaction chamber to maintain effective energy coupling across the entire volume, preventing energy loss at scale.
Solution Approach 2:
The system transitions from single-point or single-plane microwave injection to three-dimensional distributed microwave field generation. This dimensional expansion ensures uniform energy penetration and coupling efficiency throughout the entire reaction volume, enabling scalable production without efficiency loss.
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 enables efficient conversion and upgrading of hydrocarbons at lower temperatures and pressures, overcoming the limitations of scaling up microwave plasma reactors by maintaining energy input and improving reaction efficiency, thus facilitating commercial-scale production.
Implementation Method 1
one or more surface waves are propagated in the reaction tube structure to form a plasma
Implementation Method 2
form a plasma within the reaction tube structure
Implementation Method 3
microwaves are received in the waveguide
Implementation Method 4
an outer wall made of a dielectric material
Data Source
AI summary
A system for processing hydrocarbon materials, comprising a hydrocarbon feedstock source; a process gas source; a waveguide; and a reaction tube structure. The process gas source comprises one or more sources of gases selected from the group consisting of helium, argon, krypton, neon, xenon, methane, propane, butane, ethane, acetylene, propylene, butylene, ethylene, carbon monoxide, carbon dioxide, water vapor, hydrogen, and nitrogen. The waveguide comprises a lateral portion comprising housing having a first end portion configured to be connected to a microwave generator, a closed opposite end portion, a primary axis extending from the first end portion to the second end portion, and a central portion having an opening, wherein the central portion has a depth that is smaller than a corresponding depth of the first end portion and the second end portion, and a coaxial portion having a first end portion connected to the opening and a lateral dimension that is perpendicular to the primary axis. The reaction tube structure comprises an outer wall made of a dielectric material, and is configured such that when hydrocarbon feedstock from the feedstock source and process gas from the process gas source are fed into the reaction tube structure and microwaves are received in the waveguide, one or more surface waves are propagated in the reaction tube structure to form a plasma within the reaction tube structure and cause the feedstock and process gas to react and form into a product stream, and wherein the reaction tube structure has a lateral dimension that is perpendicular to the lateral portion and parallel to the coaxial portion, and the reaction tube structure is connected to a second end of the coaxial portion.