There is no doubt that
fuel injection nozzle burning will definitely influence the normal operation of
generator set. If you find the related causes, you can quickly solve the
problems.
1.
Long time idling operation
Due to the diesel engine
keeps running slowly for a long time, the temperature in the cylinder is low,
the fuel combustion is not sufficient, the combustion chamber and fuel
injection nozzle are easy to form carbon deposition. So it leads to the
deterioration of working conditions for fuel injection nozzle. Especially in
winter, it is even more serious under the condition of cold climate. Because
the combustion chamber has carbon deposition, heat dissipation is slow, which
may cause spray orifice obstruction of the fuel injection nozzle and the oil
drip phenomenon may happen. The fuel stays in the nozzle head for a long time,
the local high temperature will make the nozzle and thermal insulation jacket
burned.
2.
The fuel is not clean
Due to there are small
particles of impurities in the fuel, the
needle valve and needle valve body of the fuel injector will wear. It is
possible that the needle valve will be stuck in the needle valve body.Because
of needle valve lag, the fuel can’t be periodically, quantitatively and quickly
sprayed into the combustion chamber, the oil drip phenomenon will appear, which
may cause the fuel atomization is not good and the combustion speed is reduced.
Due to the burning time of the nozzle is extended, which will make the fuel
injection nozzle and the thermal insulation jacket burned. When such fault
occurs, there will be black smoke and chattering phenomenon.
3.
Fuel injection time is too late
The fuel injection
advance angle is too small which may cause the fuel injection time is too late.
If it can’t be adjusted for a long time, the local high temperature will make
the fuel injection nozzle and thermal insulation jacket burned.
4.
Improper assembly
If the nozzle insulation
sheath is installed without cleaning, there will be a gap between the fuel
injection nozzle and the insulation sheath. The gas enters into the gap, the
heat insulation and cooling effect is reduced, which will cause the fuel
injection nozzle and the insulation sheath burned. If the thermal insulation
sheath is too tight, the nozzle will generate additional stress. Under the
combined action of heat alternating load and high pressure of fuel injection,
the nozzle will be broken and the needle valve will be stuck. In addition, if
the insulation sheath can’t get installed during maintenance, the nozzle
extends into the combustion chamber more than 4mm above the cylinder head
bottom, the heat absorbed by the fuel injection nozzle will increase, which
make the nozzle melted.
5.
Improper use of generator set
If it lacks of coolant
liquid while the diesel generator set is at work, the combustion chamber can’t
be in good state of cooling, which will lead to the high temperature. This is
also an important reason to cause the burning of fuel injection nozzle.
Prevention
As mentioned above, the
fuel injection nozzle is one of the important equipment of diesel genset. For
the nozzle maintenance, it is necessary to keep the fuel system clean and avoid
purchasing the fuel from unreliable sources.
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