Supersonic Flow Reactor Methane Conversion
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Solution Overview
Problem
Traditional pyrolysis processes are inefficient and costly for converting methane into light olefins like ethylene, and supersonic flow reactors face challenges with mechanical failure and corrosion due to extreme operating conditions.
Innovation Solution
A supersonic flow reactor system that uses a cast reactor shell with high thermal conductivity materials and advanced cooling systems to withstand high temperatures and pressures, while converting methane to acetylene with improved yield and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional pyrolysis processes are used to convert methane to light olefins, then the process is simple and well-established, but the conversion efficiency is low and operational costs are high
Solution Approach 1:
The invention changes the operating parameters by using supersonic flow conditions (Mach numbers greater than 1) instead of conventional subsonic pyrolysis conditions. This parameter change enables higher conversion efficiency of methane to light olefins while reducing energy consumption per unit of product, directly addressing the technical contradiction between productivity and energy loss
Solution Approach 2:
The invention introduces dynamic flow conditions by accelerating the hydrocarbon feedstock to supersonic speeds through a nozzle, creating a dynamically changing reaction environment. This dynamic approach allows for rapid heating and cooling cycles that improve conversion efficiency while reducing residence time and energy loss, resolving the contradiction between productivity and operational cost
2Productivity
If supersonic flow reactor operates at extreme temperatures and pressures, then methane conversion yield is improved, but mechanical failure and corrosion occur
Solution Approach 1:
The invention applies local quality by using a multi-layer reactor shell structure where the inner layer is made of material with high melting temperature to withstand extreme conditions at the reaction zone, while outer layers provide structural support and cooling. This localized material optimization allows high acetylene yield while preventing mechanical failure and corrosion
Solution Approach 2:
The invention uses composite material structure for the reactor shell, combining materials with different properties: high melting temperature materials for thermal resistance, high thermal conductivity materials for heat dissipation, and corrosion-resistant materials for chemical stability. This composite approach enables the reactor to operate at extreme conditions for high productivity while maintaining reliability
3Loss of energy
If high thermal conductivity materials are used in reactor shell, then heat dissipation is improved, but structural integrity at high temperature may be compromised
Solution Approach 1:
The invention applies local quality by assigning different material functions to different layers: the inner layer uses high melting temperature material for structural integrity at the hot zone, while intermediate layers use high thermal conductivity materials for heat dissipation. This localized functional assignment resolves the contradiction between heat dissipation efficiency and structural integrity
Solution Approach 2:
The invention creates a composite reactor shell where materials with high thermal conductivity are combined with high-strength, high-temperature-resistant materials in a layered structure. The composite structure allows heat to be efficiently dissipated through conductive layers while the structural layers maintain integrity, resolving the contradiction between energy loss reduction and strength maintenance
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 system achieves a higher yield of acetylene from methane compared to traditional methods, with enhanced reactor durability and reduced operational costs, addressing the inefficiencies and mechanical limitations of previous technologies.
Implementation Method 1
The supersonic expansion rapidly decreases the speed of the mixture, correspondingly rapidly increasing the temperature of the mixture by converting the kinetic energy into heat. This immediately initiates pyrolysis of the methane feed stream to convert it to acetylene and other useful hydrocarbon products.
Implementation Method 2
The supersonic expansion rapidly decreases the speed of the mixture, correspondingly rapidly increasing the temperature of the mixture by converting the kinetic energy into heat.
Implementation Method 3
Another problem that may be present at high temperatures is reaction with transient species, such as radicals, e.g. hydroxide. In accordance with various embodiments disclosed herein, therefore, apparatus and methods for converting methane in feed streams to acetylene and other products are provided.
Data Source
AI summary
Apparatus and methods are provided for converting methane in a feed stream to acetylene. A hydrocarbon stream is introduced into a supersonic reactor and pyrolyzed to convert at least a portion of the methane to acetylene. The reactor effluent stream may be treated to convert acetylene to another hydrocarbon process.