Today Starlight will share the reason of fuel injector burning, hope it is helpful for you.
Fuel injector working principle
The
injector atomizes the diesel fuel and sprays it into the combustion
chamber. The injector consists mainly of the nozzle and nozzle holder.
The main parts of fuel injector are as follows:
1. Rod type filter
2. Cap nut
3. Compressing spring
4. Compression pin
5. Cap nut for fixed nozzle
6. Nozzle holder
7. Connect hole for fuel delivery
8. Nozzle holder
9. Connect tube for overflow
10. Shim
11. Pin
12. Nozzle bush
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 phonomenon 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
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.
If you also have purchase plan of diesel generator, please contact us by sales@dieselgeneratortech.com.
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