Pyrolysis Heating Element Cross-Section Segmentation

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Solution Overview

Problem

Existing hydrocarbon pyrolysis heating systems suffer from significant heat loss due to the high cross-sectional area of heating elements extending through thermal barriers, which reduces efficiency and increases energy consumption.

Innovation Solution

The system incorporates electrical leads with a maximum cross-sectional area smaller than the minimum cross-sectional Joule area of the heating element, and uses clamps with expansion slots to secure the heating element to the leads, reducing heat loss and maintaining electrical contact at elevated temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If heating elements extend through thermal barriers with large cross-sectional area, then heating efficiency is improved, but heat loss to exterior increases

Engineering Contradiction:

Improveheating efficiencyVSAvoidheat loss

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The heating element is segmented into two portions: a first portion extending through the thermal barrier and a second portion within the furnace interior. This segmentation allows the first portion to have a smaller cross-sectional area (reducing heat loss) while the second portion maintains the necessary heating function without excessive heat loss to the exterior environment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the heating element are assigned different cross-sectional areas tailored to their specific functional requirements. The first portion (extending through the barrier) has a smaller cross-sectional area to minimize heat loss, while the second portion (within the furnace) has a larger cross-sectional area to ensure adequate heating capability, optimizing each section for its local function.

Inventive Principle:

Principle #3Local quality

2Reliability

If electrical leads have large cross-sectional area, then electrical conductivity is improved, but heat loss through leads increases

Engineering Contradiction:

Improveelectrical conductivityVSAvoidheat loss through leads

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The electrical leads are designed with a cross-sectional area that is optimized for electrical conductivity while being smaller than the cross-sectional area of the heating element. This local optimization allows the leads to conduct electricity effectively while minimizing the heat loss pathway through the leads to the exterior environment.

Inventive Principle:

Principle #3Local quality

3Reliability

If heating elements are secured tightly to prevent movement, then electrical contact stability is improved, but thermal stress degradation increases

Engineering Contradiction:

Improveelectrical contact stabilityVSAvoidthermal stress resistance

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The clamp is designed with an expansion slot that accommodates thermal expansion and contraction of the heating element during temperature cycles. This design allows the heating element to expand and contract freely without compromising the electrical contact, while the clamp maintains secure retention. The expansion slot compensates for dimensional changes due to thermal stress, preventing degradation of the electrical connection.

Inventive Principle:

Principle #37Thermal expansion

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 configuration significantly reduces heat loss through the electrical leads and lead joints, enhancing the efficiency of the hydrocarbon pyrolysis process and improving the overall performance of the heating system.

Implementation Method 1

a minimum cross-sectional area of a portion of the heating element that generates Joule heating

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Implementation Method 2

a thermal barrier

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 3

hydrocarbon pyrolysis

Methodology Applied

Scientific EffectPyrolysis: Pyrolysis

Data Source

PatentUS20250042730A1Systems and techniques for electrical heating for hydrocarbon pyrolysis

Publication Date: 2025.02.06 HONEYWELL INTERNATIONAL INC

AI summary

A pyrolysis system for generating hydrogen gas by hydrocarbon pyrolysis may include a pyrolysis furnace and a heating system. The pyrolysis furnace may include a chamber defining a furnace interior. The chamber may include a thermal barrier. The heating system may include a heating element coupled to an electrical lead at a lead junction. The lead junction may be within the furnace interior. The electrical lead may include a refractory material. A maximum cross-sectional area of the electrical lead may be less than a minimum cross-sectional Joule area of the heating element. A technique for assembling a system configured to generate hydrogen gas by hydrocarbon pyrolysis may include positioning the heating element within the furnace interior of the pyrolysis furnace, and coupling the electrical lead to the heating element at the lead junction within the furnace interior.