Composite Pyrolysis Retort for Uniform Heating at High Temperature
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Solution Overview
Problem
Conventional pyrolysis processes face issues with temperature gradients and mechanical strength at high temperatures, leading to inefficient heating and operational problems, such as tar buildup and reduced Syngas purity, due to the use of low thermal conductivity materials like stainless steel or nickel alloys.
Innovation Solution
A pyrolysis structure constructed with high thermal conductivity materials like copper, explosively welded to a high temperature strength framework, which maintains a reliable joint and enhances thermal efficiency by equalizing temperature distribution throughout the retort, reducing the need for high external heating and minimizing hotspot formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional low thermal conductivity materials like stainless steel or nickel alloys are used for the pyrolysis retort, then the retort can maintain mechanical strength at high temperatures, but temperature gradients form on the retort surface leading to inefficient heating and hotspot formation
Solution Approach 1:
The retort is constructed as a composite structure with an inner layer of high thermal conductivity material (copper or aluminum) explosively welded to an outer framework of high temperature strength material (stainless steel or nickel alloy). This composite design combines the thermal conductivity benefits of copper/aluminum with the mechanical strength and high temperature resistance of stainless steel/nickel alloy, achieving both uniform temperature distribution and structural integrity at elevated temperatures.
Solution Approach 2:
The retort structure applies different material properties to different functional zones: the inner surface contacting feedstock uses high thermal conductivity material for efficient and uniform heat transfer, while the outer framework uses high temperature strength material for structural support. This localized material assignment optimizes each region's performance for its specific function.
2Loss of energy
If high thermal conductivity materials like copper are used for the pyrolysis retort, then thermal efficiency improves and temperature distribution equalizes, but the retort lacks mechanical strength at high temperatures
Solution Approach 1:
The retort is constructed as a composite structure with an inner layer of high thermal conductivity material (copper or aluminum) explosively welded to an outer framework of high temperature strength material (stainless steel or nickel alloy). This composite design combines the thermal conductivity benefits of copper/aluminum with the mechanical strength and high temperature resistance of stainless steel/nickel alloy, achieving both uniform temperature distribution and structural integrity at elevated temperatures.
3Device complexity
If the retort is stationary with feedstock at the bottom, then the structure is simple, but a significant proportion of the retort surface is not in contact with feedstock reducing heating efficiency
Solution Approach 1:
The retort is designed to rotate slowly, dynamically changing which portions of the retort surface contact the feedstock. This rotation ensures that the entire retort surface, including previously non-contacting upper portions, periodically comes into contact with feedstock for efficient heating, while also allowing cooler portions to move out of contact and be re-heated by external sources.
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 allows for a higher volume throughput of waste material, increased Syngas generation rate, and improved thermal efficiency, while effectively handling hazardous waste and reducing landfill waste by producing usable char and Syngas for energy generation.
Implementation Method 1
A pyrolysis structure at least part of which is constructed of a sheet of high thermal conductivity material explosively welded to a high temperature strength framework
Implementation Method 2
a sheet of high thermal conductivity material explosively welded to a high temperature strength framework
Data Source
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AI summary
A pyrolysis surface such as a rotating retort (26, 29) is provided by copper sheet (26b) supported by a nickel alloy framework (26a). Pyrolysis is used to destroy calorific waste and/or to produce gas therefrom.