Internal Heater Susceptor for Reactor Heat Transfer
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Solution Overview
Problem
Existing reactor designs with externally located heater elements suffer from suboptimal heat transfer efficiency and increased structural stress, leading to reduced component life due to high operational temperatures.
Innovation Solution
A susceptor arrangement with an internally located heater element and radially inward and outward susceptor portions, where the process gas path is fluidly isolated from the heater element, enhancing heat transfer efficiency and reducing thermal stress by distributing heat evenly throughout the reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an externally located heater element is used to heat the susceptor stack, then the process gas can be heated, but heat transfer efficiency is reduced because roughly half of the radiant heat does not face the susceptor stack
Solution Approach 1:
The heater element is inverted from an external position to an internal position within the susceptor stack. This inversion places the heat source directly where it is needed, ensuring that radiant heat faces the susceptor stack and process gas, thereby eliminating the energy loss associated with externally located heaters that radiate heat in all directions.
Solution Approach 2:
The heater element is extracted from the external environment and placed inside the susceptor stack structure. This extraction allows the heater to be positioned optimally within the reactor, surrounded by the susceptor walls and process gas, maximizing heat transfer efficiency while minimizing energy loss to the surrounding environment.
2Temperature
If the heater element is located externally to heat the susceptor stack, then heating can be achieved, but the heater element must operate at high temperatures that increase structural stress and reduce component life
Solution Approach 1:
The heater element is nested within the susceptor stack structure, specifically positioned within the hollow cylindrical susceptor walls. This nesting allows the heater to operate in a protected environment surrounded by the susceptor material, which acts as a thermal barrier. The heater can maintain high operating temperatures for effective heating while the susceptor structure protects it from direct exposure to extreme thermal gradients and structural stress.
Solution Approach 2:
The susceptor stack acts as an intermediary between the heater element and the process gas. The heater element heats the susceptor walls, which then conduct and distribute heat to the process gas through controlled thermal pathways. This intermediary relationship allows the heater to operate at optimal temperatures while the susceptor material manages thermal stress and distributes heat evenly, reducing structural stress on the heater element.
3Temperature
If the process gas path is not fluidly isolated from the heater element, then heat transfer may occur, but thermal gradients increase and cause structural stress
Solution Approach 1:
The reactor is segmented into distinct functional zones: a heater region containing the heater element, and a process gas path region. The susceptor stack structure creates physical separation between these zones, with the heater element surrounded by susceptor walls that define the heater region. This segmentation allows independent optimization of each zone - the heater can operate at high temperature while the process gas flows through isolated pathways, minimizing thermal gradients and structural stress.
Solution Approach 2:
Different regions of the reactor are assigned different thermal properties and functions. The heater region is designed to concentrate and generate heat, while the process gas path regions are designed for fluid flow and reaction. The susceptor walls provide localized thermal management, conducting heat where needed while providing thermal isolation where structural stability is required, thereby reducing overall thermal gradients and structural stress.
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 achieves more efficient heat transfer, reducing the maximum operating temperature of the heater element and minimizing thermal gradients, thereby prolonging its lifespan and improving reactor efficiency.
Implementation Method 1
The heater element heats an outer wall of the susceptor and the heat transfer occurs via radiant and convective energy
Implementation Method 2
The heater element heats an outer wall of the susceptor and the heat transfer occurs via radiant and convective energy
Implementation Method 3
The heat energy then conducts through the susceptor wall and into the process gas by way of convective and conductive heat transfer
Data Source
AI summary
A susceptor arrangement for a reactor includes a heater element configured to heat a process gas to be used in the reactor. Also included is an inner susceptor portion located radially inwardly of the heater element and configured to route the process gas therein along a radially inner process gas path. Further included is an outer susceptor portion located radially outwardly of the heater element and configured to route the process gas therein along a radially outer process gas path, wherein the radially inner process gas path and the radially outer process gas path are fluidly coupled and substantially fluidly isolated from the heater element.