Insulation Retaining Assembly for High-Temperature Rotary Pre-Heater
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Solution Overview
Problem
Conventional rotary regenerative heat exchangers fail to operate at high temperatures exceeding 2100 degrees Fahrenheit due to insufficient strength and oxidation issues, making them unsuitable for applications like Syngas production systems.
Innovation Solution
A rotary pre-heater design featuring an annular housing with a rotor assembly that includes a cold-end rotor and a hot-end rotor, surrounded by an insulation retaining assembly with elongate retainer elements that secure a ceramic fiber blanket to prevent circumferential movement and maintain structural integrity at high temperatures, utilizing ceramic and high-alloy steel materials for enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional metallic materials are used in rotary regenerative heat exchangers, then the device can operate at moderate temperatures, but the strength is insufficient and oxidation occurs at very high temperatures exceeding 2100 degrees Fahrenheit
Solution Approach 1:
The patent applies composite materials by combining ceramic fiber insulation material with a metallic mesh structure. The ceramic fiber blanket provides high-temperature resistance and thermal insulation, while the metallic mesh provides structural support and tensile strength. This composite structure enables the rotary pre-heater to withstand very high temperatures exceeding 2100 degrees Fahrenheit without suffering from oxidation or strength failure that would occur with conventional metallic materials alone.
2Temperature
If conventional metallic materials are used in rotary regenerative heat exchangers, then the device structure is simple, but oxidation occurs on the surfaces at very high temperatures
Solution Approach 1:
The patent uses the metallic mesh as an intermediary structure between the ceramic fiber insulation material and the external environment. The mesh serves as a protective barrier that prevents direct exposure of the ceramic fiber to oxidizing atmospheres while allowing the structure to function at high temperatures. This intermediary approach resolves the oxidation issue without requiring complete replacement of metallic components with ceramic alternatives.
3Stability of the object's composition
If the insulation assembly is secured with fixed retainer elements, then structural stability is improved, but thermal expansion and rotation at high temperatures cause stress and potential failure
Solution Approach 1:
The patent applies dynamics by designing the retainer elements with movable connections that allow for thermal expansion and rotation. The retainer elements are configured to move relative to each other and to the rotor, accommodating the dynamic changes that occur during high-temperature operation. This dynamic design prevents stress buildup and potential failure while maintaining the stability of the insulation assembly throughout the temperature cycle.
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
The solution enables the rotary pre-heater to withstand high temperatures by preventing oxidation and maintaining structural integrity, ensuring reliable operation in Syngas production systems.
Implementation Method 1
The rotor includes an insulation assembly surrounding an exterior surface defined by the annular rim
Data Source
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AI summary
An insulation retaining assembly for a high temperature rotary pre-heater having a cold- end rotor and a hot-end rotor including a plurality of elongate retainer elements. Each of the retainer elements has a root end adapted to be held in fixed relationship to the cold-end rotor and a distal end proximate to the hot-end rotor. Portions of each of the plurality of retainer elements are adapted for circumferential movement.