Coke Oven Crack Patching for Airtight High-Temperature Sealing
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Solution Overview
Problem
Coke plants face challenges in maintaining airtight environments due to cracks in refractory brick structures, leading to uncontrolled airflow and gas leaks, which affect the coking process and environmental footprint, especially under negative pressure conditions.
Innovation Solution
The use of high-temperature, gunable, flexible, and impermeable patches or seals made from materials like ceramic blankets or polymers that can be applied over or within cracks to reduce airflow, comprising multiple layers that harden to seal and anchor in place, even at high temperatures, allowing for in-situ repair without shutting down the plant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If refractory brick structures are used to construct coke ovens, then high-temperature resistance is improved, but airtightness deteriorates due to crack formation
Solution Approach 1:
A flexible coating system is applied to the refractory brick surfaces and crack areas. The coating includes a refractory cement base layer and a flexible polymer sealant top layer that can accommodate thermal expansion and contraction while maintaining airtightness. This flexible film approach prevents air leakage through cracks without restricting the thermal movement of the refractory structure.
Solution Approach 2:
A composite coating system is used combining refractory cement and flexible polymer materials. The multi-layer composite structure provides both high-temperature resistance from the refractory cement base and crack-sealing flexibility from the polymer sealant layer, resolving the contradiction between thermal stability and airtightness.
2Object-generated harmful factors
If the coke plant operates under negative pressure, then environmental emissions are reduced, but uncontrolled air infiltration through cracks increases
Solution Approach 1:
The flexible polymer sealant coating forms a continuous film over crack surfaces that prevents uncontrolled air infiltration. This flexible barrier maintains the negative pressure environment by sealing cracks while allowing the underlying refractory structure to move thermally, thus controlling air leakage and maintaining pressure stability.
Solution Approach 2:
By sealing cracks with the flexible coating system, the negative pressure environment is maintained more effectively, creating a more controlled and stable atmospheric condition within the coke oven that reduces uncontrolled air infiltration and maintains process integrity.
3Reliability
If the plant shuts down for repair, then crack sealing effectiveness is improved, but production loss increases
Solution Approach 1:
The flexible coating system is designed to be self-applicable and self-curing. The refractory cement base layer provides immediate binding, while the flexible polymer sealant cures to form a durable seal. This self-service capability allows repair teams to perform sealing operations quickly during brief shutdowns or even during operational pauses, minimizing production loss while achieving effective crack sealing.
Solution Approach 2:
The coating system is designed for preliminary application during routine maintenance windows before critical failures occur. The refractory cement base layer is applied first to prepare the surface, followed by the flexible sealant layer that provides immediate crack sealing. This preliminary action approach allows repairs to be completed during scheduled maintenance rather than waiting for catastrophic failures, reducing unplanned production losses.
4Reliability
If rigid sealing materials are used to fill cracks, then immediate sealing effectiveness is improved, but adaptability to thermal expansion deteriorates
Solution Approach 1:
The flexible polymer sealant coating is applied over the refractory cement base layer to create a flexible sealing system. This flexible top layer can stretch and contract with thermal expansion and contraction of the refractory bricks, maintaining seal integrity through temperature cycles while preventing air leakage through cracks that move thermally.
Solution Approach 2:
The coating system changes its physical parameters to adapt to thermal conditions. The flexible polymer sealant maintains its flexibility across a wide temperature range, allowing it to accommodate thermal expansion and contraction. The material's viscoelastic properties enable it to deform with thermal cycling while maintaining sealing effectiveness, resolving the contradiction between immediate seal strength and long-term thermal adaptability.
Data Source
AI summary
The present technology relates to systems and methods for reducing leaks in a system for coking coal. For example, some embodiments provide systems and method for treating a cracked or leaking surface in a system for coking coal. In particular, the present technology includes systems having one or more substances configured to reduce an airflow through one or more cracks by creating an at least partially impermeable patch. The present technology further includes methods for treating surfaces having one or more cracks to reduce an airflow through the one or more cracks.