Vent Stack Lid Sealing Structure for Coke Gas Leakage Control
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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 affects 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, designed to 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 access, 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 flexible refractory blankets and elastomeric seals that can deform and conform to maintain contact between lid portions despite mechanical fatigue and thermal expansion. These flexible sealing elements accommodate the natural movement and wear of the clamshell mechanism while preserving sealing integrity.
Solution Approach 2:
The sealing system combines multiple materials including refractory blankets, elastomeric seals, and metallic components to create a composite sealing structure. This multi-material approach allows each component to address specific challenges: refractory materials resist high temperatures, elastomers provide flexibility for movement accommodation, and metallic parts provide structural support.
2Reliability
If traditional seals are used on the vent stack lid, then initial sealing is provided, but hot exhaust gas quickly burns off the seal due to lid portion movement
Solution Approach 1:
The patent changes the material parameters of the seal by using high-temperature-resistant elastomeric materials and refractory compounds that can withstand the thermal environment. These materials maintain their sealing properties at elevated temperatures where traditional seals would fail, extending service life significantly.
Solution Approach 2:
Flexible refractory blankets and elastomeric seal elements are used instead of rigid traditional seals. These flexible materials can accommodate lid movement and thermal deformation without losing sealing effectiveness, preventing burn-off and extending seal lifespan in the high-temperature exhaust environment.
3Productivity
If the vent stack lid is designed to contain exhaust gas, then process performance is maintained, but any gap between lid portions causes air in-leakage and exhaust gas leakage
Solution Approach 1:
A multi-layer composite sealing system combining refractory blankets, elastomeric seals, and metallic gaskets is deployed to create a robust barrier against gas leakage. Each material layer addresses specific requirements: thermal resistance, flexibility for movement, and gas tightness, collectively preventing both air in-leakage and exhaust gas release.
Solution Approach 2:
Flexible refractory blankets and elastomeric sealing films are positioned at the interface between lid portions to maintain gas containment. These flexible elements conform to surface irregularities and accommodate dimensional changes due to thermal expansion and mechanical wear, ensuring continuous sealing effectiveness.
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 enhanced sealing system effectively contains exhaust gases and prevents atmospheric air ingress, reducing maintenance needs and operation costs while maintaining process integrity 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.