Diesel generator wrong operation 1: The diesel engine runs when the oil is insufficient
At this time, insufficient oil supply will cause insufficient oil supply to the surfaces of each friction pair, resulting in abnormal wear or burns. For this reason, it is necessary to ensure sufficient oil before the diesel generator starts and during the operation of the diesel engine to prevent the failure of cylinder pulling and tile burning due to lack of oil.
Diesel generator wrong operation 2: emergency shutdown with load or immediate shutdown after sudden load unloading
After the diesel engine generator is turned off, the circulation of the cooling system water stops, the heat dissipation capacity is sharply reduced, and the heated parts lose cooling, which is easy to cause the cylinder head, cylinder liner, cylinder block and other parts to overheat, resulting in cracks, or excessive expansion of the piston stuck in the cylinder liner. Inside. On the other hand, if the diesel generator is stopped without cooling at idle speed, the friction surface will not contain enough oil, and when the diesel engine is restarted, the wear will be aggravated due to poor lubrication. Therefore, before the diesel generator is turned off, the load should be unloaded, the speed should be gradually reduced, and the no-load operation should be run for a few minutes (requires no-load operation for 3 minutes).
Diesel generator wrong operation three: running with load without warming up after cold start
When the diesel generator is cold started, due to the high viscosity and poor fluidity of the oil, the oil pump is insufficient in oil supply, and the friction surface of the machine is poorly lubricated due to lack of oil, resulting in rapid wear and tear, and even failures such as cylinder pulling and tile burning. Therefore, after the diesel engine is cooled and started, it should run at idle speed to heat up, and run with load when the standby oil temperature reaches above 40 °C (when used in winter, when the cooling water temperature reaches 60 °C); Drive in first gear for a period of mile until the oil temperature is normal and the fuel supply is sufficient, and then it can be converted to normal driving.
Diesel generator wrong operation 4: Diesel engine slams the accelerator after cold start
If the throttle is slammed, the speed of the diesel generator will increase sharply, which will cause some friction surfaces on the engine to be severely worn due to dry friction. In addition, the acceptance force of the piston, connecting rod and crankshaft changes greatly when the throttle is slammed, causing severe impact and easy damage to the parts.
Diesel generator wrong operation five: running under the condition of insufficient cooling water or excessive cooling water and oil temperature
Insufficient cooling water for diesel generators will reduce its cooling effect, and the diesel engine will overheat because it cannot be effectively cooled; if the oil temperature of the cooling water and engine oil is too high, it will also cause the diesel engine to overheat. At this time, the diesel generator cylinder head, cylinder liner, piston assembly and valve are mainly subjected to a large thermal load, and their mechanical properties such as strength and toughness drop sharply, which increases the deformation of the parts, reduces the matching gap between the parts, and accelerates the wear of the parts. , In severe cases, cracks and mechanical jamming will occur. Overheating of the diesel generator will also deteriorate the combustion process of the diesel engine, causing the injector to malfunction, poor atomization, and increased carbon deposition.
Post time: Sep-20-2022