Method for insulating a process unit and process unit having an insulating region
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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, making it difficult to achieve efficient insulation in process units, especially in solar receivers where temperature fluctuations result in heat loss and reduced efficiency during operation interruptions.
Innovation Solution
Incorporating a cooling mechanism within the insulation area to manage heat transfer, using a high-temperature insulation material in conjunction with a high-performance insulation material, where the cooling medium absorbs heat from the high-temperature layer and transfers it to a consumer, thereby reducing the thickness and mass of the high-temperature insulation and enhancing the use of the high-performance material without overheating.
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 high leading to poor insulation efficiency and high thermal inertia
Solution Approach 1:
The insulation system is divided into multiple layers with different materials and functions: a first insulation layer (high-temperature material), a cooling layer (with fluid channels), and a second insulation layer (low-thermal-conductivity material). This segmentation allows each layer to perform its specific function optimally while collectively reducing thermal inertia.
Solution Approach 2:
A cooling medium (fluid) is introduced as an intermediary between the high-temperature insulation layer and the low-thermal-conductivity insulation layer. This cooling fluid absorbs excess heat through convection, preventing heat accumulation and allowing the use of better insulating materials without overheating, thereby reducing overall thermal inertia.
2Loss of energy
If the thickness of high-performance insulation material is increased to reduce heat loss, then insulation efficiency improves, but the mass increases leading to higher thermal inertia
Solution Approach 1:
The cooling fluid acts as a heat transfer intermediary that actively removes heat from the insulation system. This allows the use of thinner high-performance insulation layers since the cooling medium compensates for heat transfer, reducing the mass required while maintaining insulation efficiency.
Solution Approach 2:
The system changes the thermal management approach by introducing active cooling (fluid flow) rather than relying solely on passive insulation thickness. This parameter change allows optimization of insulation mass while maintaining low heat loss through dynamic thermal control.
3Loss of energy
If high-performance insulation material is used closer to the hot side, then insulation efficiency improves, but the material overheats due to insufficient temperature drop in the high-temperature insulation layer
Solution Approach 1:
The cooling fluid serves as a thermal intermediary that absorbs excess heat between the high-temperature insulation layer and the heat-sensitive high-performance insulation layer. This prevents temperature accumulation and protects the high-performance material from overheating while maintaining insulation efficiency.
Solution Approach 2:
The cooling layer is positioned to perform preliminary heat removal before the heat reaches the high-performance insulation material. This preliminary cooling action ensures that the temperature remains within acceptable limits for the high-performance material, allowing it to function effectively.
4Loss of energy
If radiation-shielding sheets are used to reduce heat loss and thermal inertia, then insulation performance improves, but the construction complexity increases for complicated shapes and the cost becomes too high for industrial production
Solution Approach 1:
Instead of using complex radiation-shielding sheets throughout, the invention applies different insulation materials and cooling strategies to different locations and layers. The high-performance insulation material is used where most beneficial, combined with active cooling, while maintaining simplicity for complex geometries.
Solution Approach 2:
The invention uses fluid-based cooling (pneumatics/hydraulics) instead of complex solid radiation-shielding structures. This allows flexible adaptation to complicated shapes while maintaining industrial production feasibility and reducing construction complexity compared to rigid radiation-shielding sheet assemblies.
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 significantly reduces thermal inertia and heat loss, improving the overall efficiency of the process unit by utilizing the heat in a consumer, thus minimizing the impact of thermal inertia and enhancing operational efficiency.
Implementation Method 1
the cooling medium absorbs heat from the high-temperature layer
Implementation Method 2
the heat that results from cooling is used in a consumer
Implementation Method 3
insulation consisting of radiation-shielding sheets staggered one behind the other would in principle be a very good solution
Implementation Method 4
high-performance insulation material with the lower thermal conductivity coefficient λ
Data Source
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 Man 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.