Thermal Barrier Coating for Ultra-High-Temperature Reactor
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Solution Overview
Problem
Conventional cold-wall reactors have a small effective volume, are prone to local stress concentration on the outer shell, and suffer from a thick thermal insulation liner that is easily damaged, making them unsuitable for ultra-high-temperature hydrogenation processes.
Innovation Solution
A thermal barrier coating comprising an adhesive layer, a first ceramic layer of yttrium oxide stabilized zirconia, and a second ceramic layer of alumina stabilized zirconia with a tetragonal crystal structure, which provides low thermal conductivity, high thermal expansion coefficient matching stainless steel, great fracture toughness, and thermal shock resistance, replacing the traditional thermal liner and inner liner cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional cold-wall reactor uses a thick thermal insulation liner, then the wall temperature can be kept low for safety, but the effective volume of the reactor decreases and the structure becomes more complex
Solution Approach 1:
The patent changes the thermal conductivity parameter of the liner material by using a thermal barrier coating with specialized ceramic materials (yttrium oxide stabilized zirconia and alumina stabilized zirconia) that have much lower thermal conductivity than conventional insulation materials. This allows achieving the same thermal insulation effect with a much thinner liner thickness, thereby increasing the effective reactor volume while maintaining safety.
Solution Approach 2:
The patent employs a composite thermal barrier coating structure consisting of multiple ceramic layers with different compositions and properties. The coating includes yttrium oxide stabilized zirconia layer and alumina stabilized zirconia layer, forming a composite material system that provides superior thermal insulation performance per unit thickness compared to conventional homogeneous insulation materials.
2Reliability
If a conventional cold-wall reactor uses a thick thermal insulation liner, then the wall temperature can be kept low for safety, but the design and manufacture become more complicated
Solution Approach 1:
By changing the thermal conductivity parameter through advanced ceramic coating materials, the required liner thickness is dramatically reduced. This simplifies the overall reactor structure, reduces the number of components needed, and makes design and manufacture more straightforward while maintaining the same safety level.
Solution Approach 2:
The patent extracts the thermal insulation function from the bulky conventional liner structure and concentrates it into a thin functional coating layer applied directly to the inner wall. This eliminates the need for thick standalone insulation liners and their associated support structures, simplifying the overall design.
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 thermal barrier coating increases the effective volume of the reactor, reduces local stress on the outer shell, enhances corrosion resistance, and prevents damage at high temperatures, making the reactor suitable for ultra-high-temperature hydrogenation processes while improving reaction efficiency and safety.
Implementation Method 1
a thermal barrier coating comprising an adhesive layer, a first ceramic layer and a second ceramic layer arranged in between the adhesive layer and the first ceramic layer; wherein the second ceramic layer is made of alumina stabilized zirconia... low thermal conductivity
Implementation Method 2
the zirconium oxide in the first ceramic layer and the second ceramic layer has a tetragonal crystal structure... great fracture toughness, and thermal shock resistance
Data Source
AI summary
A thermal barrier coating and a cold-wall reactor including the coating are provided. A second ceramic layer is sandwiched between the conventional two-layer structures of the thermal barrier coating. The second ceramic layer is made of aluminum oxide stabilized zirconium oxide and the content of aluminum oxide does not exceed 30 wt %. The zirconium oxide in the first and second ceramic layer has a tetragonal crystal structure. A cold-wall reactor formed by applying the thermal barrier coating provides advantageous steel hydrogen corrosion resistance in ultra-high temperature. The effective volume of the hydrogenation reactor is fully used, overcoming the problem that the thermal insulation liner is easily damaged and causes local overheating of the reactor wall, as well as eliminating potential safety hazards of reactor wall local stress concentration caused by expansion and contraction of the liner cylinder attachment member.