Fiber Lining Coating for Ethylene Cracking Furnace Durability
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Solution Overview
Problem
Conventional brick wall lining structures in ethylene cracking furnaces have high thermal conductivity, low thermal efficiency, and poor thermal shock resistance, leading to cracking and reduced service life due to thermal stress, while full-fiber linings suffer from poor wind erosion resistance and short service life due to paint separation.
Innovation Solution
A construction method involving leveling, wetting, rooting, and coating the fiber lining surface with high-temperature paint, including expansion sews to accommodate thermal expansion differences, ensuring firm bonding and crack prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional brick wall lining structure is used, then structural strength is maintained, but thermal conductivity is high and thermal efficiency is low
Solution Approach 1:
The patent uses composite materials consisting of ceramic fiber modules as the base structure and high-temperature paint as the coating layer. This composite structure combines the structural strength and thermal insulation properties of ceramic fibers with the protective and bonding properties of the paint coating, achieving both structural integrity and thermal efficiency improvement.
Solution Approach 2:
The patent changes the material parameters by replacing traditional brick wall lining with ceramic fiber modules, which have lower thermal conductivity. The specific parameters include using ceramic fiber modules with controlled density and thickness (50-100mm) to achieve optimal thermal insulation while maintaining structural strength.
2Stability of the object's composition
If conventional brick wall lining structure is used, then structural stability is maintained, but thermal shock resistance is poor leading to cracking
Solution Approach 1:
The patent changes the material composition from traditional bricks to ceramic fiber modules, which have superior thermal shock resistance. The ceramic fiber modules are designed with specific physical parameters (density, thickness, fiber diameter) that enable them to withstand rapid temperature changes without cracking, while maintaining structural stability.
Solution Approach 2:
The composite structure of ceramic fiber modules combined with high-temperature paint coating provides both structural stability and thermal shock resistance. The ceramic fibers maintain structural integrity while the paint coating protects against thermal stress, preventing cracking and improving reliability.
3Loss of energy
If full-fiber lining is used to improve thermal efficiency, then thermal conductivity is reduced, but wind erosion resistance is poor causing paint separation
Solution Approach 1:
The patent applies preliminary action by wetting the fiber lining surface before painting and creating a rooted structure through holes and cavities. This preliminary preparation ensures that the paint coating will bond firmly to the fiber lining, preventing paint separation and improving wind erosion resistance while maintaining the thermal efficiency benefits of full-fiber lining.
Solution Approach 2:
The composite structure combines ceramic fiber modules with a paint coating layer that has been properly prepared through wetting and rooting processes. This composite material structure provides both thermal insulation and protective properties, with the paint coating preventing wind erosion and the ceramic fibers maintaining thermal efficiency.
4Strength
If high-temperature paint is coated on fiber lining surface, then bonding strength is improved, but paint is prone to separation and falling off
Solution Approach 1:
The patent applies preliminary action by wetting the fiber lining surface with water or wetting agent before painting, and by creating a rooted structure through punching holes and cavities. These preliminary steps ensure that the paint coating has adequate bonding surfaces and will not separate or fall off during service, while maintaining the bonding strength improvement.
Solution Approach 2:
The patent utilizes porous materials by creating holes and cavities in the fiber lining surface before painting. These porous structures provide anchoring points for the paint coating, improving adhesion and preventing paint separation. The porous structure allows the paint to penetrate and bond firmly to the fiber lining.
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 method enhances the bonding strength and durability of the fiber lining, preventing paint separation and cracking, thereby extending the service life and improving thermal efficiency.
Implementation Method 1
spraying a wetting agent on the leveled fiber lining surface, wherein the wetting agent is specifically a diluent of silica sol and water
Implementation Method 2
coating, before the fiber lining surface is dried, high-temperature paint to the fiber lining surface that has been rooted
Implementation Method 3
reserving multiple expansion sews on the fiber lining surface during the coating process
Data Source
AI summary
A construction method of a fiber lining surface of an ethylene cracking furnace includes the following steps: S1, leveling the fiber lining surface; S2, wetting the leveled fiber lining surface; S3, rooting the wetted fiber lining surface; and S4, coating, before the fiber lining surface is dried, high-temperature paint to the fiber lining surface that has been rooted; and reserving multiple expansion sews on the fiber lining surface during the coating process. According to the construction method of the high-temperature paint for full fiber lining structure of the ethylene cracking furnace, the high-temperature paint is firmly bonded with the lining, and will not crack or fall off during use, protecting the full fiber lining by the coating and greatly extending the service life of the lining.