Refractory Inner Layer Peg-and-Recess Thermal Expansion
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Solution Overview
Problem
Industrial furnace walls with refractory inner layers and insulation layers experience significant thermal expansion differences, necessitating large expansion joints that can be inconvenient and inefficient.
Innovation Solution
A peg-and-recess system is used between the refractory inner layer and the middle layer, allowing for a form-fit connection that absorbs thermal expansion, eliminating the need for large expansion joints by using a casting compound to secure the wall elements and providing even expansion compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If expansion joints are provided between wall elements to compensate for thermal expansion, then thermal expansion can be compensated, but the solid surface is disrupted and the number of joints increases maintenance needs
Solution Approach 1:
The peg-and-recess system embeds connection elements within the wall elements themselves, creating an integrated solution where the expansion compensation mechanism is nested within the structural components rather than being added as separate external features
Solution Approach 2:
The patent changes the physical state of the connection between wall elements from rigid fixed joints to flexible peg-and-recess connections that allow controlled movement, enabling the system to adapt to thermal expansion through parameter changes in the connection geometry
2Stability of the object's composition
If many expansion joints are provided to accommodate thermal expansion, then thermal expansion is compensated, but device complexity increases
Solution Approach 1:
The patent merges the expansion compensation function with the structural connection function by integrating the peg-and-recess system directly into the wall elements, eliminating the need for separate expansion joint components and reducing overall device complexity
3Strength
If wall elements are securely mounted to prevent movement, then mounting stability is improved, but thermal expansion is restricted
Solution Approach 1:
The peg-and-recess system transitions from static rigid mounting to dynamic controlled movement, allowing the wall elements to maintain stable mounting while accommodating thermal expansion through controlled displacement of the peg within the recess geometry
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 solution ensures secure mounting and even thermal expansion compensation, reducing the size and number of expansion joints, resulting in a solid surface and simplified assembly with reduced maintenance needs.
Implementation Method 1
a form fit F acting at right angles to the surface normal N is formed between the spigot and the recess
Implementation Method 2
the middle layer and in particular the insulation layer, the industrial furnace wall remains relatively cool
Implementation Method 3
the thermal expansion of the inner layer is therefore significantly greater than that of the industrial furnace wall
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
The invention relates to a wall element (3a) of a refractory inner layer (3) for an industrial furnace wall (2) provided with a middle layer (4), and relates to a wall part (4a) of an inner layer (3) comprising a side A3, 14, which has a surface normal N, can be made to face the middle layer (4) or inner layer (3) and has a thickness of the height d, and comprising an inner side (13), which is arranged opposite the rear side A3, wherein at least one tenon (3.1, 4.1), extending in the direction R of the surface normal N, or at least one mortise (3.1, 4.1), extending in the direction R of the surface normal N, is provided on the side A3, 14, which tenon/mortise can be brought into an interlocking engagement F, acting at right angles to the surface normal N with a mortise (4.1, 3.1) or a tenon (4.1, 3.1) of a middle layer (4) or inner layer (3). The invention also relates to a protective lining (1) for an industrial furnace wall (2) comprising a refractory inner layer (3) and a middle layer (4) arranged between the inner layer (3) and the industrial furnace wall (2).