First, the water stop emergency plan
The medium frequency furnace suddenly stops water, and the circulating water pressure gauge of the melting furnace sends out a signal to automatically cut off the intermediate frequency power supply and issue an alarm signal. The pre-furnace work should take the following emergency measures:
1. Cut off the main circuit according to the power-off sequence of the melting furnace (to prevent the water pressure from suddenly returning to normal, the intermediate frequency power supply resumes to start, and the intermediate frequency current impacts the thyristor).
2. First close the total inlet valve of the cooling water system, and then open the spare fire water valve to ensure that the coil cooling water supply pressure is 0.1-0.16Mpa. 3. Cover the mouth with asbestos cloth and do the insulation work.
4. The squad leader is responsible for timely notification of dispatch and workshop director. The squad leader will find out the reason and restart the intermediate frequency furnace according to the operating procedures after returning to the normal water supply.
Second, power failure emergency plan
Emergency measures for sudden power outages in intermediate frequency furnaces:
1. Check if the cooling water of the coil is normal. If it is not normal, follow the emergency plan for water stop to ensure the cooling water is normal.
2. Notification dispatch, workshop director, squad leader to understand the reasons and time of power outage, and then take the following measures:
1 Within 4 hours of power failure, cover the furnace mouth with asbestos cloth, do the insulation work, and return to normal and then melt with 200KW power.
2 The power failure is more than 4 hours. In order to avoid the solidification of the molten iron in the furnace and destroy the lining, all the molten iron should be poured out, and the asbestos cloth should be used for heat preservation. After the fault is removed, the furnace can be refueled and the furnace can be restarted.
3 If the control power supply is also powered off and the molten iron cannot be poured out, the heat preservation work should be done until the normal power transmission, according to the operating rules, and the power is raised by 100KW, so that the furnace temperature reaches 900 ¡ãC or more, and then the power is 200KW. The molten iron is melted (to prevent the molten iron from cracking the furnace lining when it is melted with high power).
4 After the furnace molten iron is produced, observe the change of the lining. If the furnace lining has a large wear surface, it should be stopped and the lining should be repaired or dismantled.
5 For the melting furnace where the power failure occurred, the pre-furnace work should be strengthened. First, it is necessary to manually test whether the alarm system is normal, and compare the alarm coefficient with the pre-accident. When the alarm coefficient is increased, the furnace can be changed. produce.
Third, power outage, water stop emergency plan
When the medium frequency furnace has a power outage or water stop accident, the principle of ensuring that the coil cooling water is normal and then treating the molten iron is followed.
1. According to the water stop emergency plan, ensure that the coil cooling water is normal. 2. Dispose of molten iron according to the power failure emergency plan.
Fourth, the leakage emergency plan
Intermediate frequency furnace leakage emergency measures:
1. When the leaking furnace alarm sends out a signal to confirm the accident of the leaking furnace, the emergency measures when the molten iron does not seep out:
1 Cut off the main power supply (at the same time, the shift monitor informs the dispatcher, workshop director, squad leader).
2 Pour molten iron into the emergency bunker in time.
3 Keep the coil cooling water flowing.
2. When a leaking furnace accident occurs, and at the same time, an emergency measures for water stop accidents occur:
1 Cut off the main power supply (at the same time, the shift monitor informs the dispatcher, workshop director, squad leader).
2 Pour molten iron into the emergency bunker.
3 Activate the reserve water according to the water stop emergency plan to ensure that the coil passes the cooling water.
4 The production class assists in blowing the furnace with a duct, so that the furnace temperature drops as quickly as possible.
3. When there is a leakage accident, the coil has the emergency measures of water seepage:
1 Cut off the main power supply (at the same time, the shift monitor informs the dispatcher, workshop director, squad leader).
2 Close the circulating water inlet valve to prevent the molten iron from seeping and exploding.
3 pour molten iron into the emergency bunker.
4 The production class assists in blowing the furnace with a duct, so that the temperature of the furnace is lowered, and the personnel are arranged to extinguish the fire with a fire extinguisher to the bottom of the furnace.
5 Re-circulate the water, cool the coil, and place the bucket to receive water in the water seepage position of the coil.
