Direct Electrical Heating of Reactor Tubes for Uniform Temperature

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Solution Overview

Problem

Catalytic reaction systems face issues with uneven temperature gradients in reactor tubes leading to premature failure, reduced catalyst life, and increased greenhouse gas emissions due to traditional fired heating systems.

Innovation Solution

A direct electrical heating system is employed, where reactor tubes with electrically conductive surfaces are isolated and energized with adjustable electrical energy to control temperature uniformly, eliminating the need for combustion-based heating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If fired heating systems are used to heat reactor tubes, then heat can be supplied to promote catalytic reactions, but uneven temperature gradients occur along the tubes leading to premature tube failure and reduced catalyst life

Engineering Contradiction:

Improvetemperature uniformityVSAvoidreactor tube life

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent replaces the mechanical/chemical combustion-based fired heating system with an electrical heating system. Electrical heating elements are applied directly to the reactor tube surface, providing more uniform heat distribution and eliminating the temperature gradients caused by flame impingement and heat transfer inefficiencies of fired systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the heating method from external combustion heating to direct electrical heating, fundamentally altering the thermal parameters distribution along the reactor tube. This results in more uniform temperature profiles that prevent hot spots and thermal stress.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If fired heating systems are used, then catalytic reactions can be promoted, but greenhouse gas emissions increase due to combustion of hydrocarbons

Engineering Contradiction:

Improvereaction temperatureVSAvoidgreenhouse gas emissions

Core Design Contradiction:

TemperatureVSObject-generated harmful factors

Solution Approach 1:

The patent substitutes the combustion-based heating system with an electrical heating system, eliminating the chemical combustion process that generates CO2 and other greenhouse gases. The electrical heating elements provide the necessary thermal energy without hydrocarbon combustion.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Temperature

If fired heating systems are used, then heat can be supplied to the reactor, but temperature differences between multiple reactor tubes result in non-optimal throughput and yield

Engineering Contradiction:

Improvetemperature controlVSAvoidthroughput and yield

Core Design Contradiction:

TemperatureVSProductivity

Solution Approach 1:

The patent replaces the indirect fired heating system with direct electrical heating elements on each reactor tube. This allows independent temperature control of each tube, ensuring uniform heating across all tubes and optimizing the catalytic reaction conditions for maximum throughput and yield.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Use of energy by stationary object

If fired heating systems are used, then heat can be generated, but energy efficiency deteriorates over time due to wear and tear

Engineering Contradiction:

Improveheating efficiencyVSAvoidheater service life

Core Design Contradiction:

Use of energy by stationary objectVSDuration of action of moving object

Solution Approach 1:

The patent replaces the mechanical combustion system with an electrical heating system that has no moving parts or combustion chambers subject to wear. The electrical heating elements maintain consistent energy efficiency throughout their service life without the deterioration associated with fired heater components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 method achieves more even temperature distribution, extends reactor and catalyst life, improves throughput and product quality, and reduces greenhouse gas emissions by using renewable energy sources.

Implementation Method 1

providing electrical energy to the at least one electrically conductive surface on the reactor tube

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS20250303381A1Direct electrical heating of reactive systems

Publication Date: 2025.10.02 SCHNEIDER ELECTRIC SYSTEMS USA INC

AI summary

Methods of heating a reactor system by providing electrical energy are described. A reactor system comprising at least one reactor tube having a catalyst disposed therein and comprises at least one electrically conductive surface is heated by providing electrical energy to the at least one electrically conductive surface on the reactor tube and adjusting a current level of the electrical energy provided to the at least one electrically conductive surface to control the temperature of the reactor tube and the catalyst disposed therein. The reactor tube may be electrically isolated from other electrically conductive components of the reactor system.