4. 1. Cooling water is the “life” of the intermediate frequency furnace. When the hard water is heated, it will easily cause dirt to block the pipeline. It is therefore recommended that the IF power cabinet and capacitor section be cooled by a soft water cooler.

4.2, FL-350B closed cooler: This cooling unit can be used to cool two 500kw intermediate frequency power supplies at the same time. It uses pure water (softened water) as the cooling medium, a serpentine copper tube as the radiator, and fully enclosed circulating water. The heat is taken away by the action of the fan, and if necessary, the cooling effect can be enhanced by spraying water through the sprayer. The water return temperature sensor is installed with a water temperature sensor, and the whole process can be controlled during the operation. Its cooling principle is as shown in the figure:

4.3, FL-350B soft water cooler technical parameters:

4.4 cooler range:

1 case 1 set (galvanized panel)

2 cooler 1 set (copper tube)

3 fan 1 set (aluminum alloy blade)

4 spray pump 1 set

5 sets of sinks 1 set (stainless steel material)

6 dehydrator 1 set (made of PVC material)

7 main water pump 1 set

8 stainless steel circulating water tank 1 (0.5M3)

4.5. External circulating water cooling system: The external circulating water system includes equipment such as circulating pool, water pump and pipeline gate valve. It is specially used to cool the induction coil. The equipment and facilities are built by the user. Technical indicators of external circulation water:

Cooling water inlet temperature : 5 ~ 35 ° C

Cooling water outlet temperature: ≤55 °C

Cooling water pressure: 0.30Mpa ~ 0.40MPa

Water supply (pump flow): 18m 3 /h (two furnaces in total)

Return pipe slope: i=0.01

Cooling water quality requirements:

PH value: 7 ~ 8.5

Total hardness: ≤10 degrees (containing 10 mg of CaO in 1 liter of water)

The effective volume of the cooling water pool is not less than 50m 3 . (for two stoves)