Vent Stack Lid Sealing With Overlapping Refractory Layers
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Solution Overview
Problem
Vent stack lids in coke processing systems experience mechanical fatigue, leading to gaps between lid portions, resulting in air leakage and unintended exhaust gas release, which compromises process performance and safety.
Innovation Solution
The implementation of a vent stack lid system with overlapping sealing portions, including tadpole seals, spring seals, and flexible refractory blankets, to create a multi-layered sealing system that can withstand high temperatures and accommodate lid movement, ensuring a tighter seal and preventing gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a vent stack lid with side-by-side lid portions is used, then the lid can be opened in a clamshell configuration for maintenance and operation, but mechanical fatigue causes the lid portions to move apart, creating gaps that lead to air leakage and exhaust gas release
Solution Approach 1:
The patent employs a flexible seal member positioned between the first and second lid portions that can deform and conform to maintain contact as the lid portions move relative to each other during operation and under thermal expansion, preventing gaps from forming despite mechanical fatigue
Solution Approach 2:
The seal member is constructed from composite materials including refractory materials that can withstand high temperatures while maintaining sealing properties, combining thermal resistance with flexibility to address both the high-temperature environment and the movement issue
2Reliability
If a seal is placed on the vent stack lid to prevent leakage, then air in-leakage and exhaust gas release are reduced, but the seal is quickly burned off due to hot gas release from lid portion movement
Solution Approach 1:
The flexible seal member can accommodate lid portion movement without breaking or burning off by deforming elastically, maintaining its sealing function throughout the operational range of motion and thermal cycles
Solution Approach 2:
The seal member's physical parameters such as flexibility, thermal conductivity, and expansion coefficient are specifically selected and adjusted to match the operational conditions, allowing it to remain functional at high temperatures while accommodating dimensional changes in the lid structure
3Duration of action of stationary object
If the vent stack lid is designed to withstand high temperatures, then the sealing durability is improved, but the lid structure becomes more complex and expensive
Solution Approach 1:
The flexible seal member provides a relatively simple yet effective solution to the high-temperature sealing problem, avoiding the need for complex cooling systems or multiple layered structures while maintaining sealing integrity and durability
Solution Approach 2:
The seal member acts as an intermediary element between the lid portions, absorbing the complexity of high-temperature sealing requirements and allowing the main lid structure to remain relatively simple while the seal handles the thermal and mechanical stresses
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
The sealing system effectively contains exhaust gases and prevents atmospheric air ingress, reducing maintenance needs and operation costs by providing a longer-lasting, reliable seal that adapts to lid movement over time.
Implementation Method 1
spring seals
Implementation Method 2
flexible refractory blanket
Data Source
AI summary
The present technology is generally directed to vent stack lids and associated systems and methods. In particular, several embodiments are directed to vent stack lids having improved sealing properties in a coke processing system. In a particular embodiment, a vent stack lid comprises a first lid portion proximate to and at least partially spaced apart from a second lid portion. The vent stack lid further comprises a first sealing portion coupled to the first lid portion and a second sealing portion coupled to the second lid portion. In several embodiments, the second sealing portion at least partially overlaps the first sealing portion over the space between the first and second lid portions. In further embodiments, at least one of the first or second sealing portions includes layers of tadpole seals, spring seals, rigid refractory material, and/or flexible refractory blanket.