Diesel generator is a diesel engine as the prime mover, drag the synchronous generator power generation of a power supply equipment. This is a start-up quickly, easy operation and maintenance, less investment, the environment to adapt to the performance of a strong power generation device. Now the application of generators more and more widely, then the use and operation of the process will certainly encounter a variety of failures, the following simple talk about diesel generator 11 kinds of wrong way:
(1) after the cold start is not warm up with load operation
Diesel engine cold start, due to oil viscosity, poor mobility, oil pump is insufficient oil, the friction surface due to lack of oil lubrication, resulting in abrupt wear and tear, or even pull cylinder, burner and other failures. Therefore, after the start of the diesel engine cooling should be idle operation temperature, when the oil temperature reaches 40 ℃ or more when the load operation; machine starting should be linked to low speed, and in a row in each gear driving a mileage until the oil temperature is normal, Before they can turn to normal driving.
(2) Diesel engine is running when oil is low
At this time due to lack of oil supply caused by the friction surface of the fuel shortage, resulting in abnormal wear or burn. To this end, before the start of the machine and the operation of the diesel engine to ensure adequate oil to prevent the lack of oil caused by pull cylinder, burner failure.
(3) stop immediately with a load emergency stop or sudden unloading of the load
Diesel engine cooling after the cooling system to stop the water, cooling capacity drastically reduced, the heat lost parts of the cooling, Diesel Generator easy to cause cylinder head, cylinder liner, cylinder block and other parts overheating, resulting in cracks, or excessive expansion of the piston stuck in the cylinder. On the other hand, the diesel engine downtime without idle cooling, will make the friction surface oil shortage, when the diesel engine will start again due to poor lubrication and wear. Therefore, the diesel engine should be unloaded before the shutdown load, and gradually reduce the speed, no-load operation a few minutes.
(4) diesel engine after the cold start throttle throttle
If the thunder throttle, the diesel engine speed increased sharply, will cause some of the friction on the machine due to dry friction and severe wear. In addition, the throttle when the piston, connecting rod and crankshaft force changes, causing severe impact, easy to damage the parts.
(5) In the case of insufficient cooling water or cooling water, the oil temperature is too high
Diesel engine cooling water will reduce its cooling effect, the diesel engine due to lack of effective cooling and overheating; cooling water, oil oil temperature is too high, will cause the diesel engine overheating. At this point the cylinder head, cylinder liner, piston components and valves and other major heat load, its mechanical properties such as strength, toughness and other sharp decline, so that parts deformation increases, Diesel Generator reducing the gap between the parts to accelerate the wear and tear, serious But also produce cracks, mechanical parts of the fault. Cooling water, oil temperature is too high will speed up the deterioration of oil aging and burning, and oil viscosity decreased, casing and piston and the main friction conditions of the conditions of lubrication deterioration, resulting in abnormal wear and tear. Diesel engine overheating will also worsen the diesel engine combustion process, so that the injector work disorders, poor atomization, coke increased.
(6) in the cooling water and oil oil temperature is too low to run
Diesel engine work process, the cooling water temperature is too low, the cylinder wall temperature decreases, the combustion of water vapor condensed into water droplets, and exhaust gas contact with acidic substances, attached to the cylinder wall, resulting in corrosion wear. Practice has proved that the diesel engine often in the cooling water temperature 40 ℃ ~ 50 ℃ use, the parts wear than the normal operating temperature (85 ℃ ~ 95 ℃) is running several times. At this point, the water temperature is too low when the cylinder temperature is low, diesel engine ignition delay period extended, once the fire, the pressure increased rapidly, diesel fuel rough, easy to cause mechanical damage parts. Diesel engine in the long-term cooling water in the lower temperature of the state of operation, the gap between the piston and the cylinder, has occurred knocking cylinder phenomenon, and produce vibration, so that the cylinder liner. Diesel Generator Oil temperature is too low, oil viscosity is poor mobility, lubricating parts of the lack of oil, so that lubrication worse, resulting in increased friction wear, shorten the life of diesel engines.
(7) Operation when the oil pressure is too low
Oil pressure is too low, the lubrication system can not be normal oil circulation and pressure lubrication, the lubrication parts are not enough oil. Therefore, the machine in the process of driving, we should pay attention to observe the oil pressure gauge or oil pressure indicator light situation. If you find oil pressure below the specified pressure, to immediately stop, troubleshooting and then continue to drive.
(8) machine speeding, overloading
If the machine is seriously overspeed, overloaded, the diesel engine will be in the load is too large, high speed operation under the circumstances, easy to cause rough work, cylinder, piston, connecting rod and other heat load and mechanical load to increase, Cylinder, burner and other failures. Often overload operation, Diesel Generator resulting in a long time inside the cylinder rough burning, easy to damage the cylinder pad.
(9) before the flame throttle throttle
High-speed operation of the diesel engine if the sudden stop operation, its huge inertia will make the crank rod and valve parts of the body damage, shorten the service life. At the same time, Meng throttle is fuel because of excessive into the cylinder too late to burn and along the cylinder wall down, dilute the oil. In addition, the piston, the valve and the combustion chamber will increase significantly, causing the nozzle clogging and piston stuck.
(10) When the temperature of the diesel engine is too high, suddenly add cooling water
If the diesel engine overheating in the case of sudden cooling water, will cylinder head, cylinder, cylinder and other changes due to severe changes in hot and cold cracks. Therefore, the diesel engine temperature is too high should first remove the load, a slight increase in speed, until the water temperature drops after the diesel engine flame, the water radiator cover loose, remove the water vapor. If necessary, Diesel Generator slowly inject the cooling water into the water radiator.
(11) long-term idle operation
Diesel engine idling, the oil pressure is low, the piston top of the fuel injection cooling effect is poor, resulting in a sharp increase in wear and tear, easy to pull the cylinder; can also cause poor atomization, combustion is not complete, coke serious, and sometimes even lead to valve and piston ring , Cylinder liner corrosion. To this end, some diesel engine instructions clearly stipulates that the diesel engine idle time should not exceed 15 ~ 20min.
The above is the diesel generator set of 11 kinds of wrong methods of analysis, hope that the customers and friends of the purchase and use of the operation have some help.