Possible scaling of auxiliary electric heaters

Possible scaling of auxiliary electric heaters

1, Fuel waste

After scaling of the auxiliary electric heater, the heat transfer function of the heating surface deteriorates. The heat released by fuel incineration cannot be transferred to the generator water in a timely manner. Many heat is carried away by the flue gas, resulting in high exhaust temperatures. If smoke is lost and added, the thermal power of the heater will decrease. In order to comply with the additional parameters of the heater, it is necessary to add more fuel, thereby wasting fuel. A scale of approximately 1 millimeter wastes 10% of fuel.

2, Damaged heating surface

Calibrate the heater, as the heat transfer function deteriorates, the heat from fuel incineration cannot be quickly transferred to the generator water, resulting in an increase in furnace opening and flue gas temperature. As a result, the temperature difference between the two sides of the heated surface increases, the metal temperature rises, and the strength decreases. Under the pressure of the generator, there may be uplift or even explosion.

3, Reduced output of auxiliary electric heater

After scaling, the heat transfer function of the explosion-proof heater deteriorates, requiring more fuel to achieve additional transpiration. However, as the thickness of fouling increases, the furnace volume is determined and fuel consumption is limited. Therefore, the output of the explosion-proof heater will decrease and corrode.

1. Unable to heat (the internal heating wire of the electric heater is burnt out or the wire at the junction box is broken)

2. Electric heating tube rupture or rupture (electric heating tube cracks, electric heating tube corrosion and rupture, etc.)

3. Leakage (mainly due to automatic circuit breaker or leakage protection switch tripping, electric heating tube unable to heat), usually accounting for more than 90% of electric heater failures in this situation

Handling methods for electric heater faults:

If the heater cannot heat and the internal wire of the electric heating tube is broken and cannot be repaired, it can only be replaced; If the circuit or connector is open or loose, it can be reconnected.

If the electric heating tube is broken or broken, then only replace the electric heating tube.

3. If there is leakage, the leakage point should be confirmed and considered according to the situation. If it is the electric heating tube itself, it can be baked in an oven; If the insulation resistance cannot be improved, the electric heating tube may need to be replaced; If the junction box is flooded with water, dry it with a hot air gun; If the wire is damaged, it can be wrapped with adhesive tape or replaced with a new one

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