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Several operational misunderstandings of diesel generators

2018-11-22 14:19:25

Operation misunderstanding 1: operation under the condition that the cooling water is insufficient or the cooling water and oil temperature are too high

Insufficient cooling water of the diesel generator will reduce its cooling effect. The diesel engine will overheat due to the lack of effective cooling. If the oil temperature of the cooling water or oil is too high, the diesel engine will overheat. At this time, the diesel generator cylinder head, cylinder liner, piston assembly and valve are mainly subject to large heat load, and its mechanical properties such as strength and toughness are drastically reduced, which increases the deformation of the parts, reduces the matching clearance between the parts, and accelerates the wear of the parts. In severe cases, cracks may occur and the machine may become stuck. Overheating of the diesel generator will also worsen the combustion process of the diesel engine, causing the injector to malfunction, poor atomization, and increased carbon deposits.

Operation error 2: The diesel engine runs when the oil is insufficient.

Due to insufficient supply of oil, the surface of each friction pair is insufficiently supplied with oil, resulting in abnormal wear or burns. To this end, before the diesel generator starts and during the operation of the diesel engine, it is necessary to ensure sufficient oil to prevent the cylinder and the tile from being damaged due to lack of oil.

Operation misunderstanding 3: After the cold start, it will run with load without warming up.

When the diesel generator cold start, due to the large viscosity of the oil and poor fluidity, the oil supply of the oil pump is insufficient, the friction surface of the machine is poorly lubricated due to lack of oil, causing rapid wear and even failures such as pulling cylinders and burning tiles. Therefore, after the diesel engine is cooled, it should be warmed up at idle speed. When the standby oil temperature reaches 40 °C or above (when it is used in winter, when the cooling water reaches 60 °C), it will be loaded with load. The machine should start with low gear and start at each step. Driving a mileage in one gear until the oil temperature is normal and the oil supply is sufficient before it can be turned into normal driving.

 


Misunderstanding 4: The diesel engine slams the throttle after a cold start

If the throttle is slammed, the speed of the diesel generator will rise sharply, which will cause some frictional surfaces on the machine to wear out due to dry friction. In addition, when the throttle is hit, the piston, the connecting rod and the crankshaft have large variations in the receiving force, causing severe impact and easily damaging the machine.

Operation error 5: Stop immediately after loading or sudden load removal

After the diesel generator is turned off, the circulation of the cooling water is stopped, the heat dissipation capacity is drastically reduced, and the heat-receiving member loses cooling, which may cause the cylinder head, the cylinder liner, the cylinder block and the like to overheat, cause cracks, or excessively expand the piston to the cylinder liner. Inside. On the other hand, when the diesel generator is stopped without idling, the friction surface will be insufficiently oily. When the diesel engine is started again, the wear will be aggravated due to poor lubrication. Therefore, the diesel generator should be unloaded before the flameout, and gradually reduce the speed, no-load operation for a few minutes (requires no-load operation for 3 minutes).

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