Galvanic Isolation in Electrically Heated Reactor Tubes for Even Heating

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Solution Overview

Problem

Catalytic reaction systems face issues with uneven temperature gradients in reactor tubes due to fired heating, leading to premature tube failure, inconsistent throughput, and increased greenhouse gas emissions, necessitating a need for direct electrical heating with electrical isolation.

Innovation Solution

The system employs direct electrical heating of reactor tubes using galvanic isolation techniques, allowing each tube to be individually controlled through adjustable current levels, eliminating the need for electrical insulation and reducing temperature variations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by stationary object

If fired heating is used to heat reactor tubes, then heat is generated by combustion, but uneven temperature gradients occur along the tube leading to premature tube failure

Engineering Contradiction:

Improveheat generationVSAvoidtube failure

Core Design Contradiction:

Use of energy by stationary objectVSReliability

Solution Approach 1:

The patent replaces the mechanical/chemical combustion heating system with an electrical heating system. Electrical heating elements are applied directly to the reactor tube surface, substituting the fired heating mechanism. This eliminates the uneven temperature gradients caused by combustion while maintaining effective heat generation for the catalytic reaction.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The reactor tube itself serves as the heating element through direct electrical heating. The tube's conductive surface allows electrical energy to be converted directly into heat at the desired location, making the tube self-heating rather than being heated externally by combustion flames.

Inventive Principle:

Principle #25Self-service

2Use of energy by stationary object

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

Engineering Contradiction:

Improveheat supplyVSAvoidthroughput

Core Design Contradiction:

Use of energy by stationary objectVSProductivity

Solution Approach 1:

The heating system is segmented to provide individual electrical heating control for each reactor tube. Each tube receives heat independently through its own electrical heating elements, allowing precise temperature management for every tube in the array, thereby optimizing overall system throughput and yield.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The heating system becomes dynamic and adjustable, allowing real-time modification of heating parameters for each individual tube. This enables optimization of temperature conditions based on specific process requirements, maximizing productivity and yield across all reactor tubes.

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If direct electrical heating is used, then temperature control is improved, but electrical isolation of reactor tubes from other conductive components is required

Engineering Contradiction:

Improvetemperature controlVSAvoidelectrical isolation

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Electrical insulators serve as intermediary components between the electrically heated reactor tubes and other conductive parts of the system. These insulators enable the necessary electrical isolation while maintaining thermal coupling, allowing precise temperature control without compromising system integrity or adding excessive complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Use of energy by stationary object

If fired heating systems are used, then heat is generated, but wear and tear leads to deterioration in energy efficiency and increased greenhouse gas emissions

Engineering Contradiction:

Improveenergy efficiencyVSAvoidgreenhouse gas emissions

Core Design Contradiction:

Use of energy by stationary objectVSObject-generated harmful factors

Solution Approach 1:

The combustion-based fired heating system is replaced with an electrical heating system. This substitution eliminates the combustion process that generates greenhouse gas emissions while maintaining effective heat generation. The electrical system avoids wear and tear associated with mechanical combustion components, preserving energy efficiency over time.

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 approach enhances temperature control, 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 of each of the reactor tube(s)

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS20250367627A1Direct electrical heating of process heater tubes using galvanic isolation techniques

Publication Date: 2025.12.04 SCHNEIDER ELECTRIC SYSTEMS USA INC

AI summary

The present disclosure is directed to systems and methods for direct electrical heating of process heaters tubes (e.g., reactor tubes) using galvanic isolation techniques. The disclosure is also directed to systems and methods for direct electrical heating of process heaters tubes wherein the tubes are galvanically isolated in such a manner as to avoid the use of electrical insulation of the tube from the rest of the system, such as the other tubes, the tube inlet header and/or the tube outlet header, and the reactor shell.