Composite Heat Insulating Lining for Ethylene Cracking Furnace
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Solution Overview
Problem
Conventional heat insulating linings in ethylene cracking furnaces suffer from high heat conductivity and structural issues, leading to significant energy waste and poor heat preservation due to numerous heat dissipation bridges, particularly in the lower parts of the furnace where flame scouring is severe.
Innovation Solution
A composite heat insulating lining is introduced, featuring an upper and lower lining with inorganic fiber prefabricated layers, where the lower lining includes a refractory coating to protect the inorganic fiber layer from direct heat and a tiled layer to enhance flatness and insulation, along with compensation strips and anchoring members to reduce heat loss and prevent damage from flame scouring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional heat insulating lining (refractory bricks and casting materials) is used, then structural strength is improved, but heat conductivity increases leading to serious energy waste
Solution Approach 1:
The patent applies composite materials by combining inorganic fiber prefabricated layers with refractory coating to create a heat insulating lining that balances low heat conductivity with adequate structural strength. The inorganic fiber provides insulation while the refractory coating adds protective strength, resolving the contradiction between insulation performance and structural integrity.
Solution Approach 2:
The patent applies local quality by using different materials in different regions of the lining structure. The inorganic fiber prefabricated layer is used in areas requiring primary insulation, while refractory coating is applied in areas needing enhanced strength and flame resistance, optimizing both insulation and strength properties where needed.
2Stability of the object's composition
If refractory bricks and casting materials are used, then structural stability is improved, but heat dissipation bridges increase causing poor heat preservation
Solution Approach 1:
The patent uses inorganic fiber prefabricated layers that can be configured to eliminate heat dissipation bridges while maintaining structural stability. The flexible nature of the fiber layers allows them to conform to furnace geometry without creating thermal shortcuts, unlike rigid brick structures.
3Loss of energy
If inorganic fiber prefabricated layer is used without refractory coating, then heat conductivity is reduced improving heat preservation, but high temperature damage occurs reducing service life
Solution Approach 1:
The patent creates a composite structure where the inorganic fiber prefabricated layer provides heat preservation while the refractory coating layer protects against high temperature damage. This composite approach allows both heat preservation and extended service life to be achieved simultaneously.
Solution Approach 2:
The refractory coating acts as an intermediary protective layer between the inorganic fiber prefabricated layer and the high temperature environment. It shields the insulation material from direct flame contact and extreme temperatures, enabling the fiber layer to maintain its insulating properties over extended periods.
4Loss of energy
If conventional composite structure is used, then heat insulation is provided, but design and construction processes become cumbersome
Solution Approach 1:
The patent applies preliminary action by pre-fabricating the inorganic fiber layers into ready-to-install components. This prefabrication reduces on-site construction complexity and time while maintaining the required heat insulation performance, making the overall installation process more manageable.
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 solution effectively reduces heat conductivity, minimizes energy waste, and extends the service life of the lining by preventing high-temperature damage, while maintaining the furnace's heat preservation efficiency and simplifying the design, production, and construction processes.
Implementation Method 1
an inorganic fiber prefabricated layer is adopted by a lower lining of the composite heat insulating lining to perform heat insulation, so as to reduce the heat conductivity of the lining and thereby reduce the heat loss
Implementation Method 2
The composite heat insulating lining provided according to the present application is provided with a refractory coating on a surface of the inorganic fiber prefabricated layer to avoid direct heating of the inorganic fiber prefabricated layer, thereby avoiding high temperature damage
Data Source
AI summary
A composite heat insulating lining includes an upper lining and a lower lining. The upper lining and the lower lining each include an inorganic fiber prefabricated layer, and the inorganic fiber prefabricated layer is configured to reduce the heat conductivity of the lining, thereby reducing heat loss. In addition, existing inorganic fiber materials are generally not resistant to high temperature. The composite heat insulating lining provided according to the present application is provided with a refractory coating on a surface of the inorganic fiber prefabricated layer to avoid direct heating of the inorganic fiber prefabricated layer, thereby avoiding high temperature damage to the inorganic fiber prefabricated layer, and improving the service life of the composite heat insulating lining. An ethylene cracking furnace is further provided according to the present application, which includes any one of the above composite heat insulating linings.