Process Heater Tube Electrical Heating With Galvanic Isolation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

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

Innovation Solution

Implement direct electrical heating with galvanic isolation techniques to individually control the temperature of each reactor tube by providing electrical energy to its conductive surface, eliminating the need for electrical insulation and allowing direct connection to pipe headers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

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

Engineering Contradiction:

Improvetemperature uniformityVSAvoidtube failure rate

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The heating system is segmented into multiple independent heating zones along each reactor tube, with each zone controlled by a separate power controller. This allows independent temperature control in different sections of the tube, eliminating uneven temperature gradients and preventing premature tube failure while extending catalyst life through uniform thermal conditions.

Inventive Principle:

Principle #1Segmentation

2Productivity

If fired heating system is used, then catalytic reactions can be promoted, but temperature differences between multiple reactor tubes result in non-optimal throughput and product quality

Engineering Contradiction:

ImprovethroughputVSAvoidtemperature consistency between tubes

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

Each reactor tube is equipped with temperature sensors and a separate power controller that provides feedback control. The controllers continuously monitor temperature conditions and adjust electrical power delivery to maintain optimal temperature consistency across all tubes, maximizing throughput and product quality through precise thermal management.

Inventive Principle:

Principle #23Feedback

3Measurement precision

If direct electrical heating is implemented, then temperature control precision can be improved, but electrical isolation of each reactor tube from other conductive components is required

Engineering Contradiction:

Improvetemperature control precisionVSAvoidelectrical isolation requirements

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Electrical insulators are introduced as intermediary components between the reactor tubes and conductive process components (inlet/outlet headers, support structures). These insulators enable direct electrical heating with precise temperature control while simultaneously providing the necessary electrical isolation, eliminating the need for complex isolation systems and simplifying the overall device design.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Loss of energy

If fired heating system is used, then heat can be generated by combustion, but wear and tear leads to deterioration in energy efficiency and increased greenhouse gas emissions

Engineering Contradiction:

Improveenergy efficiencyVSAvoidgreenhouse gas emissions

Core Design Contradiction:

Loss of energyVSObject-generated harmful factors

Solution Approach 1:

The mechanical combustion-based fired heating system is replaced with an electrical heating system that directly converts electrical energy to thermal energy in the reactor tubes. This substitution eliminates combustion processes and associated greenhouse gas emissions, while the direct electrical heating provides superior energy efficiency by heating the tubes directly without heat transfer losses from flames or hot gases.

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 achieves uniform temperature distribution, extends reactor and catalyst life, improves throughput and product quality, reduces maintenance costs, and decreases 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

PatentUS12409427B2Direct electrical heating of process heater tubes using galvanic isolation techniques

Publication Date: 2025.09.09 SCHNEIDER ELECTRIC 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.