Refractory Shield Plate Retaining Rails for Coke Oven Doors
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Solution Overview
Problem
The existing refractory shield plates for coke oven doors require trained personnel for proper bracing, are prone to excessive compressive stresses due to thermal expansion, and have low hot buckling resistance, leading to potential panel breakage and deformation of clamping elements.
Innovation Solution
The refractory shield plate design features retaining rails that overlap the front panel, providing secure attachment in all three directions with a gap for flexibility, an L-shaped base for stability, and fiber mat filling in joints to accommodate thermal expansion, ensuring reliable clamping without excessive mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If round bars with clamping screws are used to brace the front panel, then the front panel is securely attached to the substructure, but excessive compressive stresses occur during thermal expansion leading to panel breakage or clamping element deformation
Solution Approach 1:
The retaining system is divided into multiple retaining rails (typically three) distributed around the front panel perimeter, with each rail providing independent support. This segmentation distributes the thermal expansion stresses across multiple locations rather than concentrating them at single clamping points, preventing excessive stress on any one panel section or clamping element.
Solution Approach 2:
The retaining rails are designed with adjustable positioning capabilities along the substructure, allowing the system to adapt to thermal expansion and contraction of the front panel during operation. The rails can move or adjust their clamping force dynamically rather than maintaining fixed rigid clamping, accommodating dimensional changes without creating excessive compressive stresses.
2Reliability
If trained personnel are used for bracing the front panel, then proper attachment is achieved, but assembly complexity and time requirements increase
Solution Approach 1:
The retaining rails incorporate self-aligning features and intuitive attachment mechanisms that allow the front panel to be securely mounted without requiring specialized training or expertise. The design includes built-in guidance elements, standardized interfaces, and obvious assembly sequences that enable operators to achieve proper attachment through straightforward procedures rather than requiring trained personnel.
Solution Approach 2:
The retaining rails and front panel are designed with pre-formed engagement features, pre-positioned mounting locations, and preliminary alignment elements that simplify the assembly process. The substructure includes pre-drilled holes, pre-formed grooves, and pre-positioned mounting points that guide the retaining rails into correct positions during assembly, eliminating the need for complex alignment procedures or trained personnel.
3Reliability
If the front panel is held firmly in place, then attachment security is improved, but thermal expansion creates excessive pressure leading to panel breakage
Solution Approach 1:
The retaining system is designed to change its mechanical parameters during thermal cycles. The retaining rails can adjust their position, spacing, or clamping force in response to temperature changes, maintaining secure attachment while accommodating thermal expansion. This dynamic parameter adjustment prevents excessive compressive stress buildup while preserving attachment security throughout the thermal cycle.
Solution Approach 2:
The design incorporates clearance gaps, expansion joints, or compliant elements between the front panel and retaining rails that provide built-in cushioning for thermal expansion. These features are designed in advance to absorb dimensional changes during heating and cooling cycles, preventing excessive pressure from developing while maintaining secure attachment of the panel to the substructure.
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 design simplifies assembly, enhances the service life of the refractory shield plate by preventing unintended detachment, reducing compressive stresses, and allowing for thermal expansion without mechanical stress, thus improving the structural integrity and durability of the coke oven door.
Implementation Method 1
Thermal expansion occurs during operation of the coke oven, which exerts additional pressure on the clamped front panel
Data Source
Figure 1~2
Figure 3~5
Figure 6~8
AI summary
Refractory shield plate for a coke oven door, comprises at least one refractory panel (2) and cross-holding rails (4) on both sides of the panel, which can be secured to an undercarriage of the coke oven door. An independent claim is also included for a coke oven comprising a combustion chamber which can be closed with a coke oven door, where the coke-oven door has a refractory shield plate.