Refractory Insert Retention Mechanism for Reformer Furnaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Prior refractory orifice inserts in hydrogen reformer furnaces are prone to unwanted rotation and axial displacement due to pressure drops, leading to potential dislodgment and system performance deterioration, especially in mortar-free, lightweight tunnel structures.
Innovation Solution
A refractory insert with a retention mechanism featuring axial projection and diametrically opposed slots, which securely engages with block tabs to prevent rotation and displacement, utilizing materials like alumina-based refractories for enhanced mechanical robustness and thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mortar and/or ceramic fiber gasket are used to prevent over rotation of refractory orifice inserts, then the inserts can be retained in place, but the system becomes less mechanically robust and more prone to failure under pressure drops
Solution Approach 1:
The circumferential slot is segmented with omitted segments that allow the tabs to pass through during installation, creating a mechanical interlocking system that is more robust than continuous mortar-based retention
Solution Approach 2:
The tabs are pre-positioned on the inner sidewall of the block hole, and the circumferential slot is pre-formed with omitted segments, allowing the insert to be rotated into place and mechanically locked before operation begins
2Ease of operation
If axial clearance between tabs and circumferential slot walls is increased to allow for rotation, then installation is easier, but the insert becomes more prone to axial displacement under pressure drops
Solution Approach 1:
The circumferential slot has asymmetric features with omitted segments at specific locations, allowing rotation during installation while the axial clearance is controlled to prevent displacement during operation
Solution Approach 2:
The retention mechanism transitions from purely axial retention to a combination of axial and rotational retention, using the rotational dimension to lock the insert in place while maintaining controlled axial clearance
3Ease of manufacture
If refractory orifice inserts are used in mortar-free, lightweight tunnel structures, then the tunnel structure becomes more mechanically robust and easier to assemble, but the inserts become more prone to dislodgment under pressure drops
Solution Approach 1:
The mechanical interlocking features (tabs and circumferential slots with omitted segments) are pre-formed during manufacturing, allowing for easy assembly of lightweight tunnel structures while ensuring reliable insert retention through mechanical engagement
Solution Approach 2:
The insert and block hole are designed to self-lock through the mechanical interlocking mechanism, with the tabs automatically engaging the circumferential slot during installation, eliminating the need for mortar or additional retention components
Data Source
Figure 1~2
Figure 3~4
Figure 5A
AI summary
A refractory insert is provided, including a main body part having a first surface defining a first sidewall, an opposed second surface defining a second sidewall, and an outer peripheral surface separating the first and second surfaces, and a mechanical mating member provided on at least a portion of the outer peripheral surface thereof. The mechanical mating member includes a retention mechanism for controlling and retaining a position of a corresponding mating member in connection therewith.