Multi-Tube Reactors with External Radiant Heating for Methane Conversion
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Solution Overview
Problem
Existing methods for converting methane to value-added chemicals and hydrogen are not cost-effective and energy-intensive.
Innovation Solution
A process involving a multi-tube reactor system where C1-C3 alkanes are heated outside the tubes using fuel burning nozzles, transferring heat through the tubes, with catalysts inside converting the alkanes to liquid C2-C10 products and hydrogen, utilizing temperatures from 500 to 1200°C and pressures up to 20 atmospheres.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methane conversion processes are used, then value-added chemicals and hydrogen can be produced, but the process is not cost-effective and energy-intensive
Solution Approach 1:
The patent changes key process parameters including temperature (500-1200°C), pressure (1-20 atmospheres), and residence time to optimize the balance between conversion efficiency and energy consumption. The multi-tube reactor design enables precise temperature control through external heating, allowing the system to operate at optimal temperatures for maximum productivity while minimizing excessive energy input.
Solution Approach 2:
The patent replaces conventional indirect heating methods with radiant heating from fuel-burning nozzles positioned around the tube exterior. This substitution creates a more efficient thermal transfer system where heat is transferred directly through the tube wall to the catalyst and reactants, reducing overall energy consumption while maintaining high productivity.
2Productivity
If conventional methane conversion processes are used, then value-added chemicals can be produced, but the process is not cost-effective
Solution Approach 1:
The multi-tube reactor design enables a single system to produce multiple value-added chemicals (ethylene, benzene, naphthalene, and other C2-C10 hydrocarbons) simultaneously from methane feedstock. This multi-functionality increases the economic value of the process by producing a diverse portfolio of marketable products in one reactor, improving cost-effectiveness.
Solution Approach 2:
The system uses fuel-burning nozzles that can burn either external fuel or the hydrogen produced by the reactor itself, creating a self-sustaining thermal field. This self-service capability reduces external energy input requirements and operational costs, making the process more cost-effective while maintaining high productivity.
3Reliability
If high temperature heating is applied to convert methane, then conversion efficiency improves, but energy consumption increases
Solution Approach 1:
The patent replaces conventional conduction-based heating with radiant heating from fuel-burning nozzles positioned around the tube exterior. This substitution creates a more efficient thermal transfer system where heat is transferred directly through the tube wall to the catalyst and reactants, reducing overall energy loss while maintaining the high temperatures (500-1200°C) necessary for high conversion efficiency.
Solution Approach 2:
The system utilizes the phase transition of fuel from liquid/gas to combustion products, releasing thermal energy that is directly transferred to the reactor tubes. This phase change-based heating mechanism provides intense localized heat where needed for high conversion efficiency while the radiant transfer mechanism minimizes overall energy loss to the surrounding environment.
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
Achieves cost-effective production of hydrogen and value-added chemicals like ethylene and benzene with reduced energy consumption.
Implementation Method 1
The C1-C3 alkane is heated by burning a fuel outside the tubes in fuel burning nozzles configured to transfer heat from the burning through the tubes
Implementation Method 2
The C1-C3 alkane is heated by burning a fuel outside the tubes in fuel burning nozzles
Implementation Method 3
the tubes house a catalyst for converting the C1-C3 alkane to the liquid C2-C10 product and hydrogen
Data Source
AI summary
The present disclosure refers to systems and methods for efficiently converting a C1-C3 alkane such as natural gas to a liquid C2-C10 product and hydrogen. Generally, the process comprises flowing the C1-C3 alkane through a plurality of tubes within a vessel wherein the tubes house a catalyst for converting the C1-C3 alkane to the liquid C2-C10 product and hydrogen. The C1-C3 alkane is heated under suitable conditions to produce the liquid C2-C10 product and hydrogen. Advantageously, the C1-C3 alkane is heated by burning a fuel outside the tubes in fuel burning nozzles configured to transfer heat from the burning through the tubes.