The generator cooling water pressure is normal. If the flow suddenly decreases, the cause must be identified immediately. If air enters the generator rotor, the flow rate decreases and the inlet water pressure increases, the generator must be decoupled and the generator must be decoupled. the speed should be reduced to release the air, but the vibration of the unit should be closely monitored. If abnormal vibrations occur, they should be handled according to abnormal vibration management methods.
What are the methods of cooling generators?
The cylinder liner is leaking, the cooler is damaged, etc.
1. The cylinder liner is leaking. The cylinder liner seal ring is not good and leaking.
2. The cooler is damaged. The oil cooler is damaged and some of the cooling water is leaking into the lubricant systemion.
3. The water pump is getting old. The hydraulic seal and mechanical seal of the cooling water pump are aged or damaged, and cooling water enters the lubrication system.
Marine diesel generator
1. Closed-loop air cooling
For turbogenerators less than 50,000 kilowatts, closed-loop air cooling systems are often used. . Use the fan inside the motor to blow the heating components and cool them.
2. Hydrogen Cooling
For generators with a capacity of 50,000 to 600,000 kilowatts, hydrogen cooling is widely used. The heat dissipation performance of hydrogen (purity 99%) is better than that of air, and the heat dissipation effect is good. It can significantly reduce the ventilation friction loss of the motor, thereby greatly improving the efficiency.efficiency of the generator. Explosion-proof and leak-proof measures must be taken when using hydrogen cooling, which makes the engine structure more complex and increases the consumption and cost of electrode materials.
3. Liquid Cooling
The relative cooling capacity of water is 50 times that of air. To remove the same heat, the flow rate of water required is much lower than that of air. air. Therefore, using hollow wires in the coil and passing water through the wires for cooling can significantly reduce the temperature rise of the motor, delay insulation aging, and extend the service life of the motor.
Detailed information
Strictly treated hydrogen for cooling can ensure that the inside of the generator is clean, the ventilation and cooling effect heat dissipation is stable, and there will be no problems caused by dirt.
Hydrogen contains very little oxygen, less than 2%, and does not support combustion. Even if a short circuit fault occurs inside the generator, there is no risk of fire, which can greatly reduce the degree of combustion. Damage caused by fault. In hydrogen there is less noise and the insulating materials are less susceptible to oxidation and corona damage.
The hydrogen in the generator must maintain the specified purity to ensure the operating performance of the generator and avoid explosions. For this purpose, a hydrogen supply device must be installed.
References:
If sea water is used for direct cooling, it will cause engine corrosion. Sea water is too corrosive.
Heat exchanger for cooling fresh water from sea water 1They are usually made of copper and resist corrosion.