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The reliability of the leak alarm system?
Furnace lining structure
The general lining consists of 3 layers:
A. First layer: coil slurry (permanent lining or coil cement)
This layer is a 10-25mm thick high temperature coil paste that provides high strength protection for the coil and is the last layer of protection against molten metal reaching the coil.
B. Second layer: sliding layer
This layer of material is a thin layer (< 6 mm) (such as mica) that creates a sliding layer between the coil slurry and the lining, allowing the lining to stretch freely, with as little force as possible on the coil, effectively protecting the coil, but The operation is more complicated.
C. Third layer: furnace lining material
This is the main layer and is a refractory material. It is selected according to the melting temperature of the metal.
Silica for cast iron
Aluminum oxide for cast aluminum
The coil slurry will be made into a tiny cone that will be smaller and larger.
It has two benefits:
1. The lining is easier to stretch freely and the lining life is longer;
2. The introduction of the lining is easier.
Leakage current detection: comparison of DC injection type and differential current type
DC injection type:
Advantages: Real-time detection (suitable for series and isolation systems)
Disadvantages: Can't work in the centerline grounding system
Suitable for series and isolation systems
Differential current type:
Advantages: fast response, suitable for series, parallel systems
Disadvantages: Only when the device is working, there must be a reliable grounding
Comparison: Most manufacturers' systems use only one of them, if not it is extremely dangerous.
The combination of the two provides comprehensive, secure protection for the system.
- Can respond quickly, such as a fire failure;
- Real-time monitoring, including in the event of a power outage
- Effective grounding limits the voltage to ground (to prevent power component failures)
Uniformly and intermittently welded to the inside of the coil with a copper screw. The length of the copper screw is the same as the thickness of the coil slurry, gradually forming a cone, giving the cone a solid reference. This means that the grounding fault is caused by touching the screw before the leaking molten iron reaches the coil, thus preventing the coil from being damaged.