Multi-Layer Insulation with Cooling Medium for Process Units
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Solution Overview
Problem
High-temperature insulation materials have high thermal conductivity coefficients, leading to poor insulation efficiency and increased thermal inertia in process units, making it challenging to achieve efficient insulation while minimizing mass and heat loss.
Innovation Solution
A method involving a multi-layer insulation design with a high-temperature insulation material on the warm side and a high-performance insulation material on the cold side, where a cooling medium is used to absorb heat from the high-temperature insulation layer and transfer it to a consumer, reducing the size of the high-temperature insulation and minimizing thermal inertia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high-temperature insulation material is used to insulate process units operating above 1000°C, then the insulation can withstand the high operating temperature, but the thermal conductivity coefficient is higher leading to poor insulation efficiency and increased thermal inertia
Solution Approach 1:
The insulation system is segmented into multiple functional layers: a radiant barrier layer (reflective foil) for immediate heat reflection, a high-temperature insulation layer for thermal withstand, and a low-temperature insulation layer for enhanced thermal performance. This segmentation allows each layer to specialize in specific thermal management functions, reducing overall thermal inertia while maintaining high-temperature capability.
Solution Approach 2:
The patent employs a composite insulation structure combining materials with different thermal properties: reflective metallic foils (aluminum, stainless steel) with high reflectivity and low thermal mass, ceramic fiber or calcium silicate for high-temperature resistance, and aerogel or vacuum insulation for ultra-low thermal conductivity. This composite approach achieves superior thermal performance without the high thermal inertia of conventional single-material insulation.
2Loss of energy
If the thickness of high-performance insulation material is increased to reduce heat loss, then insulation efficiency improves, but the mass of insulation increases leading to high thermal inertia
Solution Approach 1:
The patent utilizes thin reflective foil barriers (aluminum foil, stainless steel foil) with thicknesses of merely micrometers to millimeters. These thin films provide effective radiant heat reflection without adding significant mass, thereby reducing thermal inertia while maintaining insulation efficiency. The flexible nature of these films allows conformal coverage of complex process unit geometries.
Solution Approach 2:
The patent incorporates porous insulation materials such as aerogel, vacuum insulation panels, or cellular structures with high porosity (80-90% air content). These porous materials achieve ultra-low thermal conductivity (0.01-0.03 W/m·K) with minimal material density, providing excellent insulation performance with dramatically reduced mass compared to conventional solid insulation materials.
3Loss of energy
If high-performance insulation material is placed closer to the hot surface to maximize insulation efficiency, then heat loss reduces, but the material overheats because it cannot withstand high temperatures
Solution Approach 1:
The patent applies the principle of local quality by positioning different insulation materials at specific locations based on their thermal performance characteristics. The reflective foil barrier is placed closest to the hot surface to handle radiant heat, the high-temperature insulation layer occupies the intermediate zone, and the low-temperature high-performance insulation (aerogel, vacuum panel) is positioned at the outer layer where temperatures are lower. This spatial differentiation of material properties optimizes both thermal efficiency and temperature compatibility.
Solution Approach 2:
The high-temperature insulation layer (ceramic fiber, calcium silicate) serves as a thermal intermediary between the hot process surface and the temperature-sensitive low-temperature insulation layer. This intermediary layer absorbs and dissipates radiant and conductive heat, maintaining the outer insulation layer within its safe operating temperature range while still allowing effective heat management. The reflective foil also acts as an intermediary by reflecting radiant heat before it penetrates deeper into the insulation structure.
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 approach reduces thermal inertia and heat loss, enhancing the overall efficiency of the process unit by allowing the high-performance insulation material to be used more effectively without overheating, and recovers heat for reuse, thereby improving operational efficiency.
Implementation Method 1
a cooling medium is used to absorb heat from the high-temperature insulation layer
Implementation Method 2
transfer it to a consumer
Implementation Method 3
a radiation-shielding film consisting of successively staggered foils
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
The invention relates to a method for insulating a process unit, which is provided with an insulating region (17, 41) for curbing the flow of heat from a hot side to a cold side of the insulating region (17, 41), the insulating region being cooled at a point with a temperature that is lower than the temperature of the hot side, the heat absorbed by a cooling medium being transported out of the insulating region and being supplied as recovered heat to a consumer of heat.