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Common mistakes in diesel generator set operation
Update:2019-01-23 16:18 Tags:
Common mistakes in diesel generator set operation:
1) after cold start loading operation without warm-up
Diesel engine cold machine starts, because of heavy oil viscosity, liquidity is poor, is that shortage of lubricating oil in oil pump to machine friction surface for lack of oil, poor lubrication cause rapid wear, such as cylinder, tile burning even failure. Diesel engine cooling after start-up, therefore, should be idle running to heat up, for the oil loading again when the temperature is above 40 ℃; Machine should start on low gear, and step by step in a mileage every gears, until the oil temperature is normal, after fully, only to run normally.
2) diesel engine running on oil
At this point due to the oil supply shortage of lubricating oil in the surface of the friction pair, lead to abnormal wear or burns. Therefore, the machine start and diesel engine work process to ensure the oil is enough, prevent due to lack of oil cylinder, the tile burning failure.
3) loading urgent stop or sudden load down immediately after unloading
Diesel engine cooling system of the water cycle stop after flameout, heat dissipation capacity sharply reduce, the heat loss of cooling, easy to cause the cylinder head, cylinder liner, cylinder block, such as overheated parts, cracks, or stuck within the cylinder piston. On the other hand, when stop without idle speed diesel engine cooling, can make the friction surface oil shortage, when diesel engine to start again due to bad lubrication and aggravate wear. Diesel engine flameout, therefore, should be removed before the load, and gradually reduce no-load running speed, a few minutes.
4) diesel engine cold start after fierce detonation throttle
If fierce detonation throttle, the diesel engine speed rise sharply, will cause some friction on the surface due to dry friction and severe wear. In addition, the boom throttle when the piston, connecting rod and crank shaft force change is big, cause dramatic impact, easy attaint parts.
5) in the cooling water shortage or under the condition of cooling water, the oil temperature is too high
Diesel engine cooling water shortage will reduce the cooling effect, due to can not get effective cooling diesel engine overheating; High oil temperature of the cooling water, oil, can also cause the diesel engine is overheating. The cylinder head, cylinder liner, piston components and valve such as the main heat load is big, sharp decline in its mechanical properties such as strength, toughness, increase the deformation of parts, reduce the fit clearance between the parts, accelerate parts wear and tear, serious when still can produce crack, parts stuck fault. Cooling water, the oil temperature is too high, oil will accelerate the aging metamorphism and burning loss, and the oil viscosity decreased, sets of cylinder and the piston and the deterioration of the lubrication condition of main friction pair, the resulting from wear and tear. Overheating also worsen diesel engine combustion process of diesel engine, the fuel injector work disorder, atomization, carbon deposit.
6) in the water under the condition of oil and the oil temperature is too low
Diesel engine work process, the cooling water temperature is too low, the cylinder wall temperature drops, the water vapor condenses into water droplets, from the burning of contact with the waste gas generated acidity material, attached to the cylinder wall, corrosion and wear. Practice proves that the diesel engine is often used in cooling water temperature under 40 ℃ to 50 ℃, wear parts than the normal operating temperature (85 ℃ ~ 95 ℃) under operation is several times larger. At this point, the water temperature too low temperature is low, in the cylinder diesel engine ignition delay period, once the fire, the pressure rise rapidly, diesel fuel oil and crude, easy cause parts of mechanical damage. Diesel engine running under the condition of low temperature in the cooling water for a long time, the clearance between the piston and cylinder liner is big, there have been knocking phenomenon, and produces vibration, the cylinder liner cavitation occurs. The oil temperature is too low, the oil viscosity, poor liquidity insufficient lubrication parts of oil, the lubrication, it increases friction pair wear, shorten the service life of the diesel engine.
7) in the case of low oil pressure
Oil pressure is too low, the lubricating oil is not normal circulation and pressure lubrication, the lubrication parts is not enough oil. As a result, the machine in the process of driving, pay attention to the observation of the oil pressure gauge and oil pressure indicator. If discover the oil pressure is lower than the stipulated, should immediately stop, troubleshooting and then continue to drive.
8) speeding, overloading driving machine
Such as machine serious speeding, overloading, the load is too large, high speed diesel engine working circumstances, easy cause rough work, cylinder liner, piston, connecting rod under thermal load and mechanical load increase, prone to cylinder, tile burning failure, etc. Often overstretched, cause long rough combustion in cylinder, easy to damage the cylinder pad.
9) fierce detonation throttle before stall
High-speed diesel engine if suddenly shut down, its enormous inertia will make the crank connecting rod mechanism and parts of valve-train damage, shorten service life. At the same time, fierce boom throttle was due to the excessive fuel into the cylinder to complete combustion and down along the cylinder wall, dilute lubricating oil. In addition, still can make the piston, valve and combustion chamber carbon deposit increased obviously, and nozzle blocking his death.
10) diesel engine at high temperature and cooling water
If under the condition of the diesel engine overheat water shortage suddenly add cooling water, can make the cylinder head, cylinder liner, cylinder, etc. Due to the dramatic change of cold and hot crack. Diesel engine temperature is too high, therefore, should be removed when the load, a little to improve the speed, water temperature drop after the engine flameout, the water radiator cap unscrewing, eliminate water vapor. Water to the radiator slow injection cooling water when necessary.
11) idle for a long time operation
Diesel engine at idle speed, low oil pressure, piston at the top of the spray cooling effect is poor, causing a sharp increase, the wear is easier to pull cylinder; Can also cause bad atomization, incomplete combustion, carbon deposit is serious, sometimes even lead to valve and the piston ring card dead, cylinder liner cavitation. For this reason, some diesel engine operation instruction make clear a regulation, engine idle running time shall not exceed 15 ~ 20 min.
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