Incorrect operation not allowed for diesel generator set
2021-11-23
The wrong operation of diesel generator will seriously affect the service life of diesel generator set. Let's learn about the wrong operation modes of diesel generator set in daily life?
Wrong operation of diesel generator I: the diesel engine runs when the engine oil is insufficient
At this time, the oil supply on the surface of each friction pair will be insufficient due to insufficient oil supply, resulting in abnormal wear or burns. Therefore, before starting the diesel generator and during the operation of the diesel engine, it is necessary to ensure sufficient oil to prevent cylinder pulling and Bush burning due to lack of oil.
Misoperation II of diesel generator: emergency shutdown with load or immediate shutdown after sudden unloading of load
After the diesel generator stalls, the circulation of cooling system water stops, the heat dissipation capacity decreases sharply, and the heating parts lose cooling, which is easy to cause overheating of cylinder head, cylinder liner, cylinder block and other parts, produce cracks, or make the piston expand excessively and get stuck in the cylinder liner. On the other hand, if the diesel generator is shut down without idle cooling, the oil content on the friction surface will be insufficient, and the wear will be exacerbated due to poor lubrication when the diesel engine is started again. Therefore, before the diesel generator stalls, the load shall be removed, the speed shall be gradually reduced and the no-load operation shall be carried out for several minutes (no-load operation for 3 minutes is required).
Misoperation 3 of diesel generator: on load operation without warm-up after cold start
During the cold start of diesel generator, due to the high viscosity and poor fluidity of engine oil, the oil supply of engine oil pump is insufficient, and the friction surface of the machine is lack of oil and poor lubrication, resulting in rapid wear, and even cylinder pulling, Bush burning and other faults. Therefore, after the diesel engine is cooled and started, it should run at idle speed to raise the temperature, and then run with load when the oil temperature reaches more than 40 ℃ (when it is used in winter, when the cooling water degree reaches 60 ℃); When starting the machine, shift to the low gear and drive a certain mileage in each gear in sequence until the oil temperature is normal and the oil supply is sufficient.
Misoperation 4 of diesel generator: slamming throttle after cold start of diesel engine
If the accelerator is slammed, the speed of the diesel generator will rise sharply, which will cause severe wear of some friction surfaces on the engine due to dry friction. In addition, when the throttle is blown, the receiving force of the piston, connecting rod and crankshaft changes greatly, causing severe impact and easy to damage the parts.
Misoperation 5 of diesel generator: operate when the cooling water is insufficient or the temperature of cooling water and oil is too high
Insufficient cooling water of diesel generator will reduce its cooling effect, and the diesel engine will overheat due to lack of effective cooling; Too high oil temperature of cooling water and engine oil will also cause overheating of diesel engine. At this time, the main heating load of diesel generator cylinder head, cylinder liner, piston assembly and valve is large, and its mechanical properties such as strength and toughness decline sharply, which increases the deformation of parts, reduces the fit clearance between parts, accelerates the wear of parts, and even causes cracks and stuck parts in serious cases. Overheating of diesel generator will also worsen the combustion process of diesel engine, resulting in abnormal operation of fuel injector, poor atomization and increased carbon deposition.
Wrong operation of diesel generator I: the diesel engine runs when the engine oil is insufficient
At this time, the oil supply on the surface of each friction pair will be insufficient due to insufficient oil supply, resulting in abnormal wear or burns. Therefore, before starting the diesel generator and during the operation of the diesel engine, it is necessary to ensure sufficient oil to prevent cylinder pulling and Bush burning due to lack of oil.
Misoperation II of diesel generator: emergency shutdown with load or immediate shutdown after sudden unloading of load
After the diesel generator stalls, the circulation of cooling system water stops, the heat dissipation capacity decreases sharply, and the heating parts lose cooling, which is easy to cause overheating of cylinder head, cylinder liner, cylinder block and other parts, produce cracks, or make the piston expand excessively and get stuck in the cylinder liner. On the other hand, if the diesel generator is shut down without idle cooling, the oil content on the friction surface will be insufficient, and the wear will be exacerbated due to poor lubrication when the diesel engine is started again. Therefore, before the diesel generator stalls, the load shall be removed, the speed shall be gradually reduced and the no-load operation shall be carried out for several minutes (no-load operation for 3 minutes is required).
Misoperation 3 of diesel generator: on load operation without warm-up after cold start
During the cold start of diesel generator, due to the high viscosity and poor fluidity of engine oil, the oil supply of engine oil pump is insufficient, and the friction surface of the machine is lack of oil and poor lubrication, resulting in rapid wear, and even cylinder pulling, Bush burning and other faults. Therefore, after the diesel engine is cooled and started, it should run at idle speed to raise the temperature, and then run with load when the oil temperature reaches more than 40 ℃ (when it is used in winter, when the cooling water degree reaches 60 ℃); When starting the machine, shift to the low gear and drive a certain mileage in each gear in sequence until the oil temperature is normal and the oil supply is sufficient.
Misoperation 4 of diesel generator: slamming throttle after cold start of diesel engine
If the accelerator is slammed, the speed of the diesel generator will rise sharply, which will cause severe wear of some friction surfaces on the engine due to dry friction. In addition, when the throttle is blown, the receiving force of the piston, connecting rod and crankshaft changes greatly, causing severe impact and easy to damage the parts.
Misoperation 5 of diesel generator: operate when the cooling water is insufficient or the temperature of cooling water and oil is too high
Insufficient cooling water of diesel generator will reduce its cooling effect, and the diesel engine will overheat due to lack of effective cooling; Too high oil temperature of cooling water and engine oil will also cause overheating of diesel engine. At this time, the main heating load of diesel generator cylinder head, cylinder liner, piston assembly and valve is large, and its mechanical properties such as strength and toughness decline sharply, which increases the deformation of parts, reduces the fit clearance between parts, accelerates the wear of parts, and even causes cracks and stuck parts in serious cases. Overheating of diesel generator will also worsen the combustion process of diesel engine, resulting in abnormal operation of fuel injector, poor atomization and increased carbon deposition.