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Treatment method of power outage accident of metal melting furnace

Treatment method of power outage accident of metal melting furnace

The accident is unpredictable. To deal with unexpected accidents calmly, calmly, and correctly, you can prevent the accident from expanding and reduce the scope of impact. Therefore, it is necessary to be familiar with the possible accidents of the induction furnace, and the correct way to deal with these accidents.

The induction furnace is out of power due to accidents such as overcurrent and grounding of the power supply network or the accident of the induction furnace itself. When the control circuit and the main circuit are connected to the same power source, the control circuit water pump also stops working. If the power outage can be recovered in a short time, and the power outage time does not exceed 10 minutes, there is no need to use the backup water source, just wait for the power to continue. But at this time, it is necessary to prepare for the standby water source to be put into operation. If the power outage is too long, the backup water source can be connected immediately.

If the power outage is more than 10 minutes, the backup water source needs to be connected.

Due to the power outage and the stop of the water supply to the coil, the heat conducted from the molten iron is very large. If there is no water flow for a long time, the water in the coil may turn into steam, destroying the cooling of the coil, and the hose connected to the coil and the insulation of the coil will be burnt out. Therefore, for long-term power outages, the sensor can switch to industrial water or start a gasoline engine water pump. Because the furnace is in a power outage state, the water flow in the coil is 1/3 to 1/4 of that of the energized smelting.

When the power outage time is less than 1 hour, cover the iron surface with charcoal to prevent heat dissipation, and wait for the power to continue. Generally speaking, no other measures are necessary, and the temperature drop of the molten iron is also limited. For a 6-ton holding furnace, the temperature dropped by only 50°C after a one-hour power failure.

If the power outage time is more than one hour, for small-capacity furnaces, the molten iron may solidify. It is best to switch the power supply of the oil pump to a backup power supply when the liquid iron is still fluid, or use a manual backup pump to pour out the liquid iron. If the remaining molten iron solidifies in the crucible. However, due to various reasons, the molten iron cannot be poured temporarily, and some ferrosilicon can be added to reduce the solidification temperature of the molten iron and delay its solidification speed. If the molten iron has begun to solidify, try to destroy the crust on its surface, punch a hole, and open it to the inside to facilitate the removal of gas when it is remelted, and to prevent the gas from expanding and causing an explosion.

If the power outage takes more than one hour, the molten iron will completely solidify and the temperature will drop. Even if it is re-energized and melted, overcurrent will occur, and it may not be energized. Therefore, it is necessary to estimate and judge the power outage time as soon as possible, and the power outage should be more than one day, and the iron should be tapped as soon as possible before the melt temperature drops.

When the cold charge starts to melt, there is a power outage. The charge is not completely melted. Don’t turn the furnace down. Keep it as it is, just continue to supply water and wait for the next power-on time to start melting again.